<!-- doc/src/sgml/release-12.sgml -->
<!-- See header comment in release.sgml about typical markup -->

 <sect1 id="release-12-18">
  <title>Release 12.18</title>

  <formalpara>
  <title>Release date:</title>
  <para>2024-02-08</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.17.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <para>
   The <productname>PostgreSQL</productname> community will stop
   releasing updates for the 12.X release series in November 2024.
   Users are encouraged to update to a newer release branch soon.
  </para>

  <sect2>
   <title>Migration to Version 12.18</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, one bug was fixed that could have resulted in corruption of
    GIN indexes during concurrent updates.  If you suspect such
    corruption, reindex affected indexes after installing this update.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 12.17,
    see <xref linkend="release-12-17"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [5a9167c39] 2024-02-05 11:01:23 +0200
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Branch: REL_12_STABLE [2699fc035] 2024-02-05 11:04:22 +0200
Branch: master [b96115acb] 2024-02-05 11:01:30 +0200
Branch: REL_16_STABLE [fb3836855] 2024-02-05 11:03:03 +0200
Branch: REL_15_STABLE [06f36bc01] 2024-02-05 11:03:28 +0200
Branch: REL_14_STABLE [a45c950ae] 2024-02-05 11:03:43 +0200
Branch: REL_13_STABLE [b73d21648] 2024-02-05 11:04:10 +0200
Branch: REL_12_STABLE [add8bc9b8] 2024-02-05 11:04:23 +0200
-->
     <para>
      Tighten security restrictions within <command>REFRESH MATERIALIZED
      VIEW CONCURRENTLY</command> (Heikki Linnakangas)
     </para>

     <para>
      One step of a concurrent refresh command was run under weak security
      restrictions.  If a materialized view's owner could persuade a
      superuser or other high-privileged user to perform a concurrent
      refresh on that view, the view's owner could control code executed
      with the privileges of the user running <command>REFRESH</command>.
      Fix things so that all user-determined code is run as the view's
      owner, as expected.
     </para>

     <para>
      The only known exploit for this error does not work
      in <productname>PostgreSQL</productname> 16.0 and later, so it may
      be that v16 is not vulnerable in practice.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks Pedro
      Gallegos for reporting this problem.
      (CVE-2024-0985) <!-- not CVE-2023-5869 as claimed in commit msg -->
     </para>
    </listitem>

    <listitem>
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Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [9dce22033] 2023-09-27 13:02:21 +0200
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Branch: REL_12_STABLE [3b991f81c] 2023-11-17 11:47:17 +0100
Branch: REL_12_STABLE [c922b2410] 2023-12-11 12:02:01 +0100
-->
     <para>
      Fix memory leak when performing JIT inlining (Andres Freund,
      Daniel Gustafsson)
     </para>

     <para>
      There have been multiple reports of backend processes suffering
      out-of-memory conditions after sufficiently many JIT compilations.
      This fix should resolve that.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: REL_15_STABLE [f374fb4aa] 2024-01-18 11:12:31 +0900
Branch: REL_14_STABLE [5f6ec27a6] 2024-01-18 11:12:38 +0900
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     <para>
      When dequeueing from an LWLock, avoid needing to search the list of
      waiting processes (Andres Freund)
     </para>

     <para>
      This fixes O(N^2) behavior when the list of waiters is long.  In
      some use-cases this results in substantial throughput improvements.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_16_STABLE [62f120203] 2024-02-01 12:34:21 -0500
Branch: REL_15_STABLE [12ec16d11] 2024-02-01 12:34:21 -0500
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Branch: REL_12_STABLE [2e822a1d6] 2024-02-01 12:34:21 -0500
-->
     <para>
      Avoid generating incorrect partitioned-join plans (Richard Guo)
     </para>

     <para>
      Some uncommon situations involving lateral references could create
      incorrect plans.  Affected queries could produce wrong answers, or
      odd failures such as <quote>variable not found in subplan target
      list</quote>, or executor crashes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [29f114b6f] 2024-01-11 15:28:22 -0500
Branch: REL_16_STABLE [80bece312] 2024-01-11 15:28:13 -0500
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Branch: REL_12_STABLE [69c12c417] 2024-01-11 15:28:13 -0500
-->
     <para>
      Fix incorrect wrapping of subquery output expressions in
      PlaceHolderVars (Tom Lane)
     </para>

     <para>
      This fixes incorrect results when a subquery is underneath an outer
      join and has an output column that laterally references something
      outside the outer join's scope.  The output column might not appear
      as NULL when it should do so due to the action of the outer join.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [2a67b5a60] 2024-01-07 09:10:19 +0200
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Branch: REL_12_STABLE [72d5b2776] 2024-01-07 09:18:43 +0200
Branch: master [6d94cc6ca] 2024-01-08 20:00:20 +0200
Branch: REL_16_STABLE [20a566cd4] 2024-01-08 19:57:09 +0200
Branch: REL_15_STABLE [6eecc3a62] 2024-01-08 19:57:03 +0200
Branch: REL_14_STABLE [97e64911d] 2024-01-08 19:57:58 +0200
Branch: REL_13_STABLE [17b6f39f1] 2024-01-08 19:58:38 +0200
Branch: REL_12_STABLE [a5e2853c3] 2024-01-08 19:58:51 +0200
-->
     <para>
      Avoid requesting an oversize shared-memory area in parallel hash
      join (Thomas Munro, Andrei Lepikhov, Alexander Korotkov)
     </para>

     <para>
      The limiting value was too large, allowing <quote>invalid DSA memory
      alloc request size</quote> errors to occur with sufficiently large
      expected hash table sizes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [60f227316] 2023-11-28 12:00:14 +0200
Branch: REL_16_STABLE [9fee3232a] 2023-11-28 11:59:45 +0200
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-->
     <para>
      Avoid assertion failures in <function>heap_update()</function>
      and <function>heap_delete()</function> when a tuple to be updated by
      a foreign-key enforcement trigger fails the extra visibility
      crosscheck (Alexander Lakhin)
     </para>

     <para>
      This error had no impact in non-assert builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [bb812ab09] 2024-01-24 14:20:01 +0900
Branch: REL_16_STABLE [51193e7a7] 2024-01-24 14:20:08 +0900
Branch: REL_15_STABLE [ad6fbbeeb] 2024-01-24 14:20:10 +0900
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Branch: REL_13_STABLE [bfec14d06] 2024-01-24 14:20:13 +0900
Branch: REL_12_STABLE [2f7242837] 2024-01-24 14:20:14 +0900
-->
     <para>
      Fix possible failure during <command>ALTER TABLE ADD
      COLUMN</command> on a complex inheritance tree (Tender Wang)
     </para>

     <para>
      If a grandchild table would inherit the new column via multiple
      intermediate parents, the command failed with <quote>tuple already
      updated by self</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [3e91dba8b] 2024-01-31 13:15:21 +0900
Branch: REL_16_STABLE [f33e83285] 2024-01-31 13:16:43 +0900
Branch: REL_15_STABLE [41fa4b31c] 2024-01-31 13:16:46 +0900
Branch: REL_14_STABLE [dde5b01c3] 2024-01-31 13:16:47 +0900
Branch: REL_13_STABLE [4d0e8a008] 2024-01-31 13:16:49 +0900
Branch: REL_12_STABLE [056109782] 2024-01-31 13:16:50 +0900
-->
     <para>
      Fix problems with duplicate token names in <command>ALTER TEXT
      SEARCH CONFIGURATION ... MAPPING</command> commands (Tender Wang,
      Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [28f84f72f] 2023-11-19 21:03:38 +0100
Branch: REL_16_STABLE [ee32b824d] 2023-11-19 21:03:50 +0100
Branch: REL_15_STABLE [0177fc773] 2023-11-19 21:04:16 +0100
Branch: REL_14_STABLE [9dd50e92e] 2023-11-19 21:04:28 +0100
Branch: REL_13_STABLE [1e468ea4e] 2023-11-19 21:04:39 +0100
Branch: REL_12_STABLE [4f8d3c5b5] 2023-11-19 21:04:47 +0100
-->
     <para>
      Properly lock the associated table during <command>DROP
      STATISTICS</command> (Tomas Vondra)
     </para>

     <para>
      Failure to acquire the lock could result in <quote>tuple
      concurrently deleted</quote> errors if the <command>DROP</command>
      executes concurrently with <command>ANALYZE</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [743ddafc7] 2023-11-16 10:05:14 -0500
Branch: REL_16_STABLE [f07a3039c] 2023-11-16 10:05:14 -0500
Branch: REL_15_STABLE [9057ddbef] 2023-11-16 10:05:14 -0500
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Branch: REL_13_STABLE [5c11104c7] 2023-11-16 10:05:14 -0500
Branch: REL_12_STABLE [abd1b1325] 2023-11-16 10:05:14 -0500
-->
     <para>
      Fix function volatility checking for <literal>GENERATED</literal>
      and <literal>DEFAULT</literal> expressions (Tom Lane)
     </para>

     <para>
      These places could fail to detect insertion of a volatile function
      default-argument expression, or decide that a polymorphic function
      is volatile although it is actually immutable on the datatype of
      interest.  This could lead to improperly rejecting or accepting
      a <literal>GENERATED</literal> clause, or to mistakenly applying the
      constant-default-value optimization in <command>ALTER TABLE ADD
      COLUMN</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ad98fb142] 2024-01-13 13:46:27 -0500
Branch: REL_16_STABLE [7e2561e1a] 2024-01-13 13:46:27 -0500
Branch: REL_15_STABLE [2a46a0df4] 2024-01-13 13:46:27 -0500
Branch: REL_14_STABLE [db122d426] 2024-01-13 13:46:27 -0500
Branch: REL_13_STABLE [98e03f957] 2024-01-13 13:46:27 -0500
Branch: REL_12_STABLE [3b4d85cf1] 2024-01-13 13:46:27 -0500
Branch: master [96c019ffa] 2024-01-13 13:54:11 -0500
Branch: REL_16_STABLE [56dcd71de] 2024-01-13 13:54:11 -0500
Branch: REL_15_STABLE [d41358f4b] 2024-01-13 13:54:11 -0500
Branch: REL_14_STABLE [7ceeb57ba] 2024-01-13 13:54:11 -0500
Branch: REL_13_STABLE [475b3ea3c] 2024-01-13 13:54:11 -0500
Branch: REL_12_STABLE [d29a4fbac] 2024-01-13 13:54:11 -0500
-->
     <para>
      Detect that a new catalog cache entry became stale while detoasting
      its fields (Tom Lane)
     </para>

     <para>
      We expand any out-of-line fields in a catalog tuple before inserting
      it into the catalog caches.  That involves database access which
      might cause invalidation of catalog cache entries &mdash; but the
      new entry isn't in the cache yet, so we would miss noticing that it
      should get invalidated.  The result is a race condition in which an
      already-stale cache entry could get made, and then persist
      indefinitely.  This would lead to hard-to-predict misbehavior.
      Fix by rechecking the tuple's visibility after detoasting.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [0e3e8fbd3] 2023-11-09 09:50:23 +0000
Branch: REL_16_STABLE [c396aca2b] 2023-11-09 09:53:05 +0000
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-->
     <para>
      Fix edge-case integer overflow detection bug on some platforms (Dean
      Rasheed)
     </para>

     <para>
      Computing <literal>0 - INT64_MIN</literal> should result in an
      overflow error, and did on most platforms.  However, platforms with
      neither integer overflow builtins nor 128-bit integers would fail to
      spot the overflow, instead returning <literal>INT64_MIN</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [25cd2d640] 2024-01-26 13:39:45 -0500
Branch: REL_16_STABLE [7204aea83] 2024-01-26 13:39:37 -0500
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Branch: REL_12_STABLE [c3bdb25fb] 2024-01-26 13:39:37 -0500
-->
     <para>
      Detect Julian-date overflow when adding or subtracting
      an <type>interval</type> to/from a <type>timestamp</type> (Tom Lane)
     </para>

     <para>
      Some cases that should cause an out-of-range error produced an
      incorrect result instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [b218fbb7a] 2023-11-18 14:41:20 +0000
Branch: REL_16_STABLE [72d0c135b] 2023-11-18 14:46:02 +0000
Branch: REL_15_STABLE [2851aa7d1] 2023-11-18 14:47:04 +0000
Branch: REL_14_STABLE [2ffcebdba] 2023-11-18 14:48:10 +0000
Branch: REL_13_STABLE [428770aad] 2023-11-18 14:49:18 +0000
Branch: REL_12_STABLE [f499d2b20] 2023-11-18 14:50:00 +0000
-->
     <para>
      Add more checks for overflow in <function>interval_mul()</function>
      and <function>interval_div()</function> (Dean Rasheed)
     </para>

     <para>
      Some cases that should cause an out-of-range error produced an
      incorrect result instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [059de3ca4] 2023-12-26 17:57:48 -0500
Branch: REL_16_STABLE [e87252ceb] 2023-12-26 17:57:48 -0500
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-->
     <para>
      Make the <structname>pg_file_settings</structname> view check
      validity of unapplied values for settings
      with <literal>backend</literal>
      or <literal>superuser-backend</literal> context (Tom Lane)
     </para>

     <para>
      Invalid values were not noted in the view as intended.  This escaped
      detection because there are very few settings in these groups.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [a11c9c42e] 2023-12-01 16:05:41 +0100
Branch: REL_16_STABLE [267f33f68] 2023-12-01 16:09:54 +0100
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Branch: REL_13_STABLE [3c49fa2af] 2023-12-01 16:23:18 +0100
Branch: REL_12_STABLE [5d40b3c4f] 2023-12-01 16:27:18 +0100
-->
     <para>
      Match collation too when matching an existing index to a new
      partitioned index (Peter Eisentraut)
     </para>

     <para>
      Previously we could accept an index that has a different collation
      from the corresponding element of the partition key, possibly
      leading to misbehavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [6a1ea02c4] 2024-01-29 13:46:22 +0200
Branch: REL_16_STABLE [b899e00e7] 2024-01-29 13:46:30 +0200
Branch: REL_15_STABLE [e43425f48] 2024-01-29 13:46:42 +0200
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Branch: REL_12_STABLE [e6511fe64] 2024-01-29 13:46:48 +0200
-->
     <para>
      Fix insufficient locking when cleaning up an incomplete split of
      a GIN index's internal page (Fei Changhong, Heikki Linnakangas)
     </para>

     <para>
      The code tried to do this with shared rather than exclusive lock on
      the buffer.  This could lead to index corruption if two processes
      attempted the cleanup concurrently.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5c62ecf6e] 2023-11-13 11:44:35 -0500
Branch: REL_16_STABLE [f76b975d5] 2023-11-13 11:44:48 -0500
Branch: REL_15_STABLE [4c73ec604] 2023-11-13 11:44:57 -0500
Branch: REL_14_STABLE [d900e74e0] 2023-11-13 11:45:04 -0500
Branch: REL_13_STABLE [c859d688b] 2023-11-13 11:45:09 -0500
Branch: REL_12_STABLE [5a6937ec9] 2023-11-13 11:45:13 -0500
-->
     <para>
      Avoid premature release of buffer pin in GIN index insertion
      (Tom Lane)
     </para>

     <para>
      If an index root page split occurs concurrently with our own
      insertion, the code could fail with <quote>buffer NNNN is not owned
      by resource owner</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [903737c5b] 2023-12-21 12:43:36 -0500
Branch: REL_16_STABLE [0977bd64e] 2023-12-21 12:43:36 -0500
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Branch: REL_14_STABLE [375f441bd] 2023-12-21 12:43:36 -0500
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Branch: REL_12_STABLE [1771ec9a8] 2023-12-21 12:43:36 -0500
-->
     <para>
      Avoid failure with partitioned SP-GiST indexes (Tom Lane)
     </para>

     <para>
      Trying to use an index of this kind could lead to <quote>No such
      file or directory</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [59bd34c2f] 2023-12-15 13:55:05 -0500
Branch: REL_16_STABLE [152bfc0af] 2023-12-15 13:55:05 -0500
Branch: REL_15_STABLE [7a99fb6e1] 2023-12-15 13:55:05 -0500
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Branch: REL_13_STABLE [55b5c67da] 2023-12-15 13:55:05 -0500
Branch: REL_12_STABLE [ba66f2533] 2023-12-15 13:55:05 -0500
-->
     <para>
      Fix ownership change reporting for large objects (Tom Lane)
     </para>

     <para>
      A no-op <command>ALTER LARGE OBJECT OWNER</command> command (that
      is, one selecting the existing owner) passed the wrong class ID to
      the <varname>PostAlterHook</varname>, probably confusing any
      extension using that hook.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [8a7cbfce1] 2023-12-12 17:05:18 +0100
Branch: REL_16_STABLE [0e2c05af9] 2023-12-12 17:05:27 +0100
Branch: REL_15_STABLE [f5d8f59ca] 2023-12-12 17:05:29 +0100
Branch: REL_14_STABLE [0cfd3ddfe] 2023-12-12 17:05:33 +0100
Branch: REL_13_STABLE [d99294e77] 2023-12-12 17:05:34 +0100
Branch: REL_12_STABLE [4d45ecc92] 2023-12-12 17:05:36 +0100
-->
     <para>
      Prevent standby servers from incorrectly processing dead index
      tuples during subtransactions (Fei Changhong)
     </para>

     <para>
      The <structfield>startedInRecovery</structfield> flag was not
      correctly set for a subtransaction.  This affects only processing of
      dead index tuples.  It could allow a query in a subtransaction to
      ignore index entries that it should return (if they are already dead
      on the primary server, but not dead to the standby transaction), or
      to prematurely mark index entries as dead that are not yet dead on
      the primary.  It is not clear that the latter case has any serious
      consequences, but it's not the intended behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [8d7d2197f] 2023-12-11 08:50:43 +0530
Branch: REL_16_STABLE [01cc92fa6] 2023-12-11 08:36:17 +0530
Branch: REL_15_STABLE [332b43063] 2023-12-11 08:23:33 +0530
Branch: REL_14_STABLE [3f86867d5] 2023-12-11 08:10:46 +0530
Branch: REL_13_STABLE [b47ea4f3d] 2023-12-11 07:57:50 +0530
Branch: REL_12_STABLE [e81e617f3] 2023-12-11 07:45:45 +0530
-->
     <para>
      Fix deadlock between a logical replication apply worker, its
      tablesync worker, and a session process trying to alter the
      subscription (Shlok Kyal)
     </para>

     <para>
      One edge of the deadlock loop did not involve a lock wait, so the
      deadlock went undetected and would persist until manual
      intervention.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [aaf09c592] 2024-01-03 17:40:41 -0500
Branch: REL_16_STABLE [fb464a1ae] 2024-01-03 17:40:38 -0500
Branch: REL_15_STABLE [a0d016393] 2024-01-03 17:40:38 -0500
Branch: REL_14_STABLE [9b042e27e] 2024-01-03 17:40:38 -0500
Branch: REL_13_STABLE [5810888c5] 2024-01-03 17:40:38 -0500
Branch: REL_12_STABLE [c20f2aab6] 2024-01-03 17:40:38 -0500
-->
     <para>
      Return the correct status code when a new client disconnects without
      responding to the server's password challenge (Liu Lang, Tom Lane)
     </para>

     <para>
      In some cases we'd treat this as a loggable error, which was not the
      intention and tends to create log spam, since common clients
      like <application>psql</application> frequently do this.  It may
      also confuse extensions that
      use <varname>ClientAuthentication_hook</varname>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c82207a54] 2023-11-28 12:34:03 -0500
Branch: REL_16_STABLE [efa8f6064] 2023-11-28 12:34:03 -0500
Branch: REL_15_STABLE [5dd30bb54] 2023-11-28 12:34:03 -0500
Branch: REL_14_STABLE [b2b1f1288] 2023-11-28 12:34:03 -0500
Branch: REL_13_STABLE [efb804682] 2023-11-28 12:34:03 -0500
Branch: REL_12_STABLE [0bd682246] 2023-11-28 12:34:03 -0500
-->
     <para>
      Fix incompatibility with <application>OpenSSL</application> 3.2
      (Tristan Partin, Bo Andreson)
     </para>

     <para>
      Use the BIO <quote>app_data</quote> field for our private storage,
      instead of assuming it's okay to use the <quote>data</quote> field.
      This mistake didn't cause problems before, but with 3.2 it leads
      to crashes and complaints about double frees.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0a5c46a7a] 2023-12-11 11:51:56 -0500
Branch: REL_16_STABLE [ebbd499d4] 2023-12-11 11:51:56 -0500
Branch: REL_15_STABLE [551d4b28e] 2023-12-11 11:51:56 -0500
Branch: REL_14_STABLE [07ce24326] 2023-12-11 11:51:56 -0500
Branch: REL_13_STABLE [87b46ad90] 2023-12-11 11:51:56 -0500
Branch: REL_12_STABLE [271d24f31] 2023-12-11 11:51:56 -0500
-->
     <para>
      Be more wary about <application>OpenSSL</application> not
      setting <varname>errno</varname> on error (Tom Lane)
     </para>

     <para>
      If <varname>errno</varname> isn't set, assume the cause of the
      reported failure is read EOF.  This fixes rare cases of strange
      error reports like <quote>could not accept SSL connection:
      Success</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e4e63cd98] 2024-02-02 15:34:29 -0500
Branch: REL_16_STABLE [a15378100] 2024-02-02 15:34:29 -0500
Branch: REL_15_STABLE [3766b8b64] 2024-02-02 15:34:29 -0500
Branch: REL_14_STABLE [329b96882] 2024-02-02 15:34:29 -0500
Branch: REL_13_STABLE [29df29dad] 2024-02-02 15:34:29 -0500
Branch: REL_12_STABLE [4493bfb70] 2024-02-02 15:34:29 -0500
-->
     <para>
      Report <systemitem>ENOMEM</systemitem> errors from file-related system
      calls as <literal>ERRCODE_OUT_OF_MEMORY</literal>,
      not <literal>ERRCODE_INTERNAL_ERROR</literal> (Alexander Kuzmenkov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [01eca6a91] 2023-11-27 09:40:44 +0900
Branch: REL_16_STABLE [8984480b5] 2023-11-27 09:40:49 +0900
Branch: REL_15_STABLE [b97226815] 2023-11-27 09:40:50 +0900
Branch: REL_14_STABLE [c3b79223f] 2023-11-27 09:40:52 +0900
Branch: REL_13_STABLE [09f680d11] 2023-11-27 09:40:55 +0900
Branch: REL_12_STABLE [0217a7444] 2023-11-27 09:40:57 +0900
-->
     <para>
      Avoid race condition when <application>libpq</application>
      initializes OpenSSL support concurrently in two different threads
      (Willi Mann, Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d053a879b] 2023-11-23 13:30:18 -0500
Branch: REL_16_STABLE [85eb77185] 2023-11-23 13:30:18 -0500
Branch: REL_15_STABLE [a50053777] 2023-11-23 13:30:18 -0500
Branch: REL_14_STABLE [8f23e6a45] 2023-11-23 13:30:18 -0500
Branch: REL_13_STABLE [5abdfd88f] 2023-11-23 13:30:18 -0500
Branch: REL_12_STABLE [18fad508b] 2023-11-23 13:30:19 -0500
-->
     <para>
      Fix timing-dependent failure in GSSAPI data transmission (Tom Lane)
     </para>

     <para>
      When using GSSAPI encryption in non-blocking
      mode, <application>libpq</application> sometimes failed
      with <quote>GSSAPI caller failed to retransmit all data needing to
      be retried</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a70f2a57f] 2023-11-13 17:04:26 -0500
Branch: REL_16_STABLE [64d2467fc] 2023-11-13 17:04:26 -0500
Branch: REL_15_STABLE [f15147df6] 2023-11-13 17:04:10 -0500
Branch: REL_14_STABLE [15439205d] 2023-11-13 17:04:10 -0500
Branch: REL_13_STABLE [9e08789d4] 2023-11-13 17:04:10 -0500
Branch: REL_12_STABLE [891afa84c] 2023-11-13 17:04:10 -0500
Branch: master [1e3f461e8] 2023-11-14 00:31:39 -0500
Branch: REL_16_STABLE [f1674ac6b] 2023-11-14 00:31:39 -0500
Branch: REL_15_STABLE [63c1b4d88] 2023-11-14 00:31:39 -0500
Branch: REL_14_STABLE [c532be99d] 2023-11-14 00:31:39 -0500
Branch: REL_13_STABLE [7836f6838] 2023-11-14 00:31:39 -0500
Branch: REL_12_STABLE [e43790342] 2023-11-14 00:31:39 -0500
-->
     <para>
      In <application>pg_dump</application>, don't dump RLS policies or
      security labels for extension member objects (Tom Lane, Jacob
      Champion)
     </para>

     <para>
      Previously, commands would be included in the dump to set these
      properties, which is really incorrect since they should be
      considered as internal affairs of the extension.  Moreover, the
      restoring user might not have adequate privilege to set them, and
      indeed the dumping user might not have enough privilege to dump them
      (since dumping RLS policies requires acquiring lock on their table).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7418767f1] 2023-12-29 10:57:11 -0500
Branch: REL_16_STABLE [b2c9936a7] 2023-12-29 10:57:11 -0500
Branch: REL_15_STABLE [1e0841426] 2023-12-29 10:57:11 -0500
Branch: REL_14_STABLE [aa2e323ee] 2023-12-29 10:57:11 -0500
Branch: REL_13_STABLE [8d4e8b746] 2023-12-29 10:57:11 -0500
Branch: REL_12_STABLE [69d7edb06] 2023-12-29 10:57:11 -0500
-->
     <para>
      In <application>pg_dump</application>, don't dump an extended
      statistics object if its underlying table isn't being dumped
      (Rian McGuire, Tom Lane)
     </para>

     <para>
      This conforms to the behavior for other dependent objects such as
      indexes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9034a2d51] 2024-01-07 15:19:50 -0500
Branch: REL_16_STABLE [cf6f802bf] 2024-01-07 15:19:50 -0500
Branch: REL_15_STABLE [940ab02b5] 2024-01-07 15:19:50 -0500
Branch: REL_14_STABLE [90e8b86fc] 2024-01-07 15:19:50 -0500
Branch: REL_13_STABLE [9e7432faf] 2024-01-07 15:19:50 -0500
Branch: REL_12_STABLE [1c7443521] 2024-01-07 15:19:50 -0500
-->
     <para>
      Fix crash in <filename>contrib/intarray</filename> if an array with
      an element equal to <literal>INT_MAX</literal> is inserted into
      a <literal>gist__int_ops</literal> index
      (Alexander Lakhin, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [208470136] 2023-12-19 18:19:05 +0900
Branch: REL_16_STABLE [7f68b1462] 2023-12-19 18:19:15 +0900
Branch: REL_15_STABLE [2e08440d6] 2023-12-19 18:19:16 +0900
Branch: REL_14_STABLE [bfbe4a146] 2023-12-19 18:19:18 +0900
Branch: REL_13_STABLE [586c6a091] 2023-12-19 18:19:19 +0900
Branch: REL_12_STABLE [f610d4f11] 2023-12-19 18:19:21 +0900
-->
     <para>
      Report a better error
      when <filename>contrib/pageinspect</filename>'s
      <function>hash_bitmap_info()</function> function is applied to a
      partitioned hash index (Alexander Lakhin, Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [a8dd62ef4] 2023-12-19 15:20:39 +0900
Branch: REL_16_STABLE [b4948ed66] 2023-12-19 15:20:48 +0900
Branch: REL_15_STABLE [b745f1680] 2023-12-19 15:20:50 +0900
Branch: REL_14_STABLE [f729fdab4] 2023-12-19 15:20:52 +0900
Branch: REL_13_STABLE [b4c1d255c] 2023-12-19 15:20:53 +0900
Branch: REL_12_STABLE [bd2d3c928] 2023-12-19 15:20:55 +0900
-->
     <para>
      Report a better error
      when <filename>contrib/pgstattuple</filename>'s
      <function>pgstathashindex()</function> function is applied to a
      partitioned hash index (Alexander Lakhin)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [9886744a3] 2024-01-10 10:41:57 +0900
Branch: REL_16_STABLE [714bfb781] 2024-01-12 13:53:07 +0900
Branch: REL_15_STABLE [33d1be06a] 2024-01-12 13:53:10 +0900
Branch: REL_14_STABLE [4c6944223] 2024-01-12 13:53:12 +0900
Branch: REL_13_STABLE [c8aab699e] 2024-01-12 13:53:13 +0900
Branch: REL_12_STABLE [9e70e6564] 2024-01-12 13:53:14 +0900
Branch: master [b83747a8a] 2024-01-11 10:39:58 +0900
Branch: REL_16_STABLE [506c77f9b] 2024-01-12 13:59:51 +0900
Branch: REL_15_STABLE [7e7d827f5] 2024-01-12 13:59:58 +0900
Branch: REL_14_STABLE [4a7475e9a] 2024-01-12 14:00:00 +0900
Branch: REL_13_STABLE [2a0eb80ae] 2024-01-12 14:00:01 +0900
Branch: REL_12_STABLE [e50a52b2b] 2024-01-12 14:00:02 +0900
-->
     <para>
      On Windows, suppress autorun options when launching subprocesses
      in <application>pg_ctl</application>
      and <application>pg_regress</application> (Kyotaro Horiguchi)
     </para>

     <para>
      When launching a child process via <filename>cmd.exe</filename>,
      pass the <option>/D</option> flag to prevent executing any autorun
      commands specified in the registry.  This avoids possibly-surprising
      side effects.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [400928b83] 2024-01-29 12:06:13 -0500
Branch: REL_16_STABLE [e02fea093] 2024-01-29 12:06:07 -0500
Branch: REL_15_STABLE [3f8ac13b1] 2024-01-29 12:06:07 -0500
Branch: REL_14_STABLE [29e25a6b1] 2024-01-29 12:06:08 -0500
Branch: REL_13_STABLE [7c53b1977] 2024-01-29 12:06:08 -0500
Branch: REL_12_STABLE [b2fd1dab9] 2024-01-29 12:06:08 -0500
-->
     <para>
      Fix compilation failures with <application>libxml2</application>
      version 2.12.0 and later (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [58c3151bb] 2023-12-26 16:16:37 -0500
Branch: REL_16_STABLE [b0115e7e2] 2023-12-26 16:16:29 -0500
Branch: REL_15_STABLE [5f8d6d709] 2023-12-26 16:16:29 -0500
Branch: REL_14_STABLE [7978eee02] 2023-12-26 16:16:29 -0500
Branch: REL_13_STABLE [48e797164] 2023-12-26 16:16:29 -0500
Branch: REL_12_STABLE [1613e2fae] 2023-12-26 16:16:29 -0500
Branch: master [a46972e30] 2023-12-26 17:03:02 -0500
Branch: REL_16_STABLE [c72049dbc] 2023-12-26 17:03:24 -0500
-->
     <para>
      Suppress compiler warnings from Python's header files
      (Peter Eisentraut, Tom Lane)
     </para>

     <para>
      Our preferred compiler options provoke warnings about constructs
      appearing in recent versions of Python's header files.  When using
      <application>gcc</application>, we can suppress these warnings with
      a pragma.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [d282e88e5] 2024-01-25 13:44:54 +1300
Branch: REL_16_STABLE [60ba7cae7] 2024-01-25 13:45:22 +1300
Branch: REL_15_STABLE [67f7aaa38] 2024-01-25 13:46:07 +1300
Branch: REL_14_STABLE [364283c92] 2024-01-25 13:46:38 +1300
Branch: REL_13_STABLE [70a82f40a] 2024-01-25 13:47:20 +1300
Branch: REL_12_STABLE [d060cb658] 2024-01-25 13:47:35 +1300
-->
     <para>
      Avoid deprecation warning when compiling with LLVM 18 (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [272a7c303] 2024-02-01 15:57:53 -0500
Branch: REL_16_STABLE [b4fb76fb5] 2024-02-01 15:57:53 -0500
Branch: REL_15_STABLE [970b1aeeb] 2024-02-01 15:57:53 -0500
Branch: REL_14_STABLE [35b8b2c4a] 2024-02-01 15:57:53 -0500
Branch: REL_13_STABLE [ac3afc3f7] 2024-02-01 15:57:53 -0500
Branch: REL_12_STABLE [b59ae79b7] 2024-02-01 15:57:53 -0500
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2024a for DST law changes in Greenland, Kazakhstan, and
      Palestine, plus corrections for the Antarctic stations Casey and
      Vostok.  Also historical corrections for Vietnam, Toronto, and
      Miquelon.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-17">
  <title>Release 12.17</title>

  <formalpara>
  <title>Release date:</title>
  <para>2023-11-09</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.16.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.17</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you use GiST indexes, it may be advisable to reindex them;
    see the fourth changelog entry below.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 12.16,
    see <xref linkend="release-12-16"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3b0776fde] 2023-11-06 10:38:00 -0500
Branch: REL_16_STABLE [d3d1e2509] 2023-11-06 10:38:00 -0500
Branch: REL_15_STABLE [4f4a422fb] 2023-11-06 10:38:00 -0500
Branch: REL_14_STABLE [9146d0d65] 2023-11-06 10:38:00 -0500
Branch: REL_13_STABLE [d3de70fdb] 2023-11-06 10:38:00 -0500
Branch: REL_12_STABLE [e911afd09] 2023-11-06 10:38:00 -0500
Branch: REL_11_STABLE [8c6633f4d] 2023-11-06 10:38:00 -0500
-->
     <para>
      Fix handling of unknown-type arguments
      in <literal>DISTINCT</literal> <type>"any"</type> aggregate
      functions (Tom Lane)
     </para>

     <para>
      This error led to a <type>text</type>-type value being interpreted
      as an <type>unknown</type>-type value (that is, a zero-terminated
      string) at runtime.  This could result in disclosure of server
      memory following the <type>text</type> value.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks Jingzhou Fu
      for reporting this problem.
      (CVE-2023-5868)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [18b585155] 2023-11-06 10:56:43 -0500
Branch: REL_16_STABLE [e24daa94b] 2023-11-06 10:56:43 -0500
Branch: REL_15_STABLE [3bc6bc3ee] 2023-11-06 10:56:43 -0500
Branch: REL_14_STABLE [edc0a8d82] 2023-11-06 10:56:43 -0500
Branch: REL_13_STABLE [26c599beb] 2023-11-06 10:56:43 -0500
Branch: REL_12_STABLE [d267cea24] 2023-11-06 10:56:43 -0500
Branch: REL_11_STABLE [c48008f59] 2023-11-06 10:56:43 -0500
-->
     <para>
      Detect integer overflow while computing new array dimensions
      (Tom Lane)
     </para>

     <para>
      When assigning new elements to array subscripts that are outside the
      current array bounds, an undetected integer overflow could occur in
      edge cases.  Memory stomps that are potentially exploitable for
      arbitrary code execution are possible, and so is disclosure of
      server memory.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks Pedro
      Gallegos for reporting this problem.
      (CVE-2023-5869)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [3a9b18b30] 2023-11-06 06:14:13 -0800
Branch: REL_16_STABLE [785412731] 2023-11-06 06:14:16 -0800
Branch: REL_15_STABLE [595c988c9] 2023-11-06 06:14:16 -0800
Branch: REL_14_STABLE [508acb901] 2023-11-06 06:14:17 -0800
Branch: REL_13_STABLE [28b609550] 2023-11-06 06:14:17 -0800
Branch: REL_12_STABLE [2893f2f40] 2023-11-06 06:14:17 -0800
Branch: REL_11_STABLE [e082734c8] 2023-11-06 06:14:18 -0800
Author: Noah Misch <noah@leadboat.com>
Branch: master [b72de09a1] 2023-11-06 06:14:13 -0800
Branch: REL_16_STABLE [2c3c5ec49] 2023-11-06 06:14:16 -0800
Branch: REL_15_STABLE [fbc371909] 2023-11-06 06:14:16 -0800
Branch: REL_14_STABLE [ecd5d240c] 2023-11-06 06:14:17 -0800
Branch: REL_13_STABLE [2c7a2a00a] 2023-11-06 06:14:17 -0800
Branch: REL_12_STABLE [7bbf4d037] 2023-11-06 06:14:17 -0800
Branch: REL_11_STABLE [a27be40c1] 2023-11-06 06:14:18 -0800
-->
     <para>
      Prevent the <literal>pg_signal_backend</literal> role from
      signalling background workers and autovacuum processes
      (Noah Misch, Jelte Fennema-Nio)
     </para>

     <para>
      The documentation says that <literal>pg_signal_backend</literal>
      cannot issue signals to superuser-owned processes.  It was able to
      signal these background processes, though, because they advertise a
      role OID of zero.  Treat that as indicating superuser ownership.
      The security implications of cancelling one of these process types
      are fairly small so far as the core code goes (we'll just start
      another one), but extensions might add background workers that are
      more vulnerable.
     </para>

     <para>
      Also ensure that the <varname>is_superuser</varname> parameter is
      set correctly in such processes.  No specific security consequences
      are known for that oversight, but it might be significant for some
      extensions.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Hemanth Sandrana and Mahendrakar Srinivasarao
      for reporting this problem.
      (CVE-2023-5870)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [28d3c2ddc] 2023-09-26 14:14:49 +0300
Branch: REL_16_STABLE [d7f521325] 2023-09-26 14:15:01 +0300
Branch: REL_15_STABLE [c3c284b37] 2023-09-26 14:15:19 +0300
Branch: REL_14_STABLE [747cef5a5] 2023-09-26 14:15:28 +0300
Branch: REL_13_STABLE [db7394d4d] 2023-09-26 14:15:35 +0300
Branch: REL_12_STABLE [26917ebea] 2023-09-26 15:41:44 +0300
-->
     <para>
      Fix misbehavior during recursive page split in GiST index build
      (Heikki Linnakangas)
     </para>

     <para>
      Fix a case where the location of a page downlink was incorrectly
      tracked, and introduce some logic to allow recovering from such
      situations rather than silently doing the wrong thing.  This error
      could result in incorrect answers from subsequent index searches.
      It may be advisable to reindex all GiST indexes after installing
      this update.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [d9e46dfb7] 2023-10-13 01:12:31 +1300
Branch: REL_16_STABLE [595db9e9c] 2023-10-13 01:13:07 +1300
Branch: REL_15_STABLE [1e81d3e6e] 2023-10-13 01:13:36 +1300
Branch: REL_14_STABLE [d26f33c32] 2023-10-13 01:13:59 +1300
Branch: REL_13_STABLE [890a73ba3] 2023-10-13 01:14:22 +1300
Branch: REL_12_STABLE [3cc0c2517] 2023-10-13 01:14:46 +1300
Branch: REL_11_STABLE [2759924f3] 2023-10-13 01:15:12 +1300
Author: David Rowley <drowley@postgresql.org>
Branch: master [f0c409d9c] 2023-10-12 19:50:38 +1300
Branch: REL_16_STABLE [6352f1627] 2023-10-12 19:51:26 +1300
Branch: REL_15_STABLE [916adc7c5] 2023-10-12 19:52:05 +1300
Branch: REL_14_STABLE [cd15bff48] 2023-10-12 19:52:31 +1300
Branch: REL_13_STABLE [45c4b2a3a] 2023-10-12 19:52:58 +1300
Branch: REL_12_STABLE [cd259de50] 2023-10-12 19:53:23 +1300
Branch: REL_11_STABLE [07f261b31] 2023-10-12 19:53:50 +1300
-->
     <para>
      Fix partition step generation and runtime partition pruning for
      hash-partitioned tables with multiple partition keys (David Rowley)
     </para>

     <para>
      Some cases involving an <literal>IS NULL</literal> condition on one
      of the partition keys could result in a crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [714780dcd] 2023-09-28 16:29:37 -0700
Branch: REL_16_STABLE [3fa81b62e] 2023-09-28 16:29:35 -0700
Branch: REL_15_STABLE [cac37c1a1] 2023-09-28 16:29:32 -0700
Branch: REL_14_STABLE [41486c4aa] 2023-09-28 16:29:29 -0700
Branch: REL_13_STABLE [d4724e94a] 2023-09-28 16:29:27 -0700
Branch: REL_12_STABLE [b36d72cbc] 2023-09-28 16:29:24 -0700
Branch: REL_11_STABLE [7c07305e6] 2023-09-28 16:29:22 -0700
-->
     <para>
      Fix edge case in btree mark/restore processing of ScalarArrayOpExpr
      clauses (Peter Geoghegan)
     </para>

     <para>
      When restoring an indexscan to a previously marked position, the
      code could miss required setup steps if the scan had advanced
      exactly to the end of the matches for a ScalarArrayOpExpr (that is,
      an <literal>indexcol = ANY(ARRAY[])</literal>) clause.  This could
      result in missing some rows that should have been fetched.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [237f8765d] 2023-10-28 14:05:01 -0400
Branch: REL_16_STABLE [07494a0df] 2023-10-28 14:04:43 -0400
Branch: REL_15_STABLE [592cb11fb] 2023-10-28 14:04:43 -0400
Branch: REL_14_STABLE [5d7515d7d] 2023-10-28 14:04:43 -0400
Branch: REL_13_STABLE [b7684473d] 2023-10-28 14:04:43 -0400
Branch: REL_12_STABLE [d8d7f282f] 2023-10-28 14:04:43 -0400
Branch: REL_11_STABLE [7ab6971c6] 2023-10-28 14:04:43 -0400
-->
     <para>
      Fix intra-query memory leak when a set-returning function repeatedly
      returns zero rows (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f73fa5a47] 2023-09-18 14:28:17 -0400
Branch: REL_16_STABLE [ec693a3f3] 2023-09-18 14:27:47 -0400
Branch: REL_15_STABLE [95f54f0d0] 2023-09-18 14:27:47 -0400
Branch: REL_14_STABLE [9baabfa38] 2023-09-18 14:27:47 -0400
Branch: REL_13_STABLE [e6e50ada0] 2023-09-18 14:27:47 -0400
Branch: REL_12_STABLE [123337079] 2023-09-18 14:27:47 -0400
Branch: REL_11_STABLE [db00be6d7] 2023-09-18 14:27:47 -0400
-->
     <para>
      Don't crash if <function>cursor_to_xmlschema()</function> is applied
      to a non-data-returning Portal (Boyu Yang)
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [73635b6d6] 2023-10-31 16:42:08 +1300
Branch: REL_16_STABLE [a98f01c93] 2023-10-31 16:42:35 +1300
Branch: REL_15_STABLE [136068353] 2023-10-31 16:43:01 +1300
Branch: REL_14_STABLE [c5988e69f] 2023-10-31 16:43:28 +1300
Branch: REL_13_STABLE [b3c8d1d0e] 2023-10-31 16:44:00 +1300
Branch: REL_12_STABLE [efcb601d2] 2023-10-31 16:44:27 +1300
-->
     <para>
      Throw the intended error if <function>pgrowlocks()</function> is
      applied to a partitioned table (David Rowley)
     </para>

     <para>
      Previously, a not-on-point complaint <quote>only heap AM is
      supported</quote> would be raised.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [13503eb59] 2023-10-30 14:46:05 -0700
Branch: REL_16_STABLE [1a368dd3e] 2023-10-30 14:46:08 -0700
Branch: REL_15_STABLE [e633e9b13] 2023-10-30 14:46:08 -0700
Branch: REL_14_STABLE [0a7b183fd] 2023-10-30 14:46:09 -0700
Branch: REL_13_STABLE [123b0d111] 2023-10-30 14:46:09 -0700
Branch: REL_12_STABLE [975ae0553] 2023-10-30 14:46:09 -0700
Branch: REL_11_STABLE [bae063db4] 2023-10-30 14:46:09 -0700
-->
     <para>
      Handle invalid indexes more cleanly in assorted SQL functions
      (Noah Misch)
     </para>

     <para>
      Report an error if <function>pgstatindex()</function>,
      <function>pgstatginindex()</function>,
      <function>pgstathashindex()</function>,
      or <function>pgstattuple()</function> is applied to an invalid
      index.  If <function>brin_desummarize_range()</function>,
      <function>brin_summarize_new_values()</function>,
      <function>brin_summarize_range()</function>,
      or <function>gin_clean_pending_list()</function> is applied to an
      invalid index, do nothing except to report a debug-level message.
      Formerly these functions attempted to process the index, and might
      fail in strange ways depending on what the failed <command>CREATE
      INDEX</command> had left behind.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cf1c65070] 2023-09-25 11:50:28 -0400
Branch: REL_16_STABLE [8465efc1a] 2023-09-25 11:50:28 -0400
Branch: REL_15_STABLE [71bb73f60] 2023-09-25 11:50:28 -0400
Branch: REL_14_STABLE [a2799f53d] 2023-09-25 11:50:28 -0400
Branch: REL_13_STABLE [52a676ef4] 2023-09-25 11:50:28 -0400
Branch: REL_12_STABLE [4a81ed29d] 2023-09-25 11:50:28 -0400
Branch: REL_11_STABLE [0fb91ed2b] 2023-09-25 11:50:28 -0400
-->
     <para>
      Avoid premature memory allocation failure with long inputs
      to <function>to_tsvector()</function> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5b7b38246] 2023-10-01 13:16:47 -0400
Branch: REL_16_STABLE [5c34a7374] 2023-10-01 13:16:59 -0400
Branch: REL_15_STABLE [55e188a15] 2023-10-01 13:17:06 -0400
Branch: REL_14_STABLE [cf12c4fd2] 2023-10-01 13:17:11 -0400
Branch: REL_13_STABLE [9da153846] 2023-10-01 13:17:15 -0400
Branch: REL_12_STABLE [2296bc362] 2023-10-01 13:17:20 -0400
Branch: REL_11_STABLE [7a310cae0] 2023-10-01 13:17:25 -0400
-->
     <para>
      Fix over-allocation of the constructed <type>tsvector</type>
      in <function>tsvectorrecv()</function> (Denis Erokhin)
     </para>

     <para>
      If the incoming vector includes position data, the binary receive
      function left wasted space (roughly equal to the size of the
      position data) in the finished <type>tsvector</type>.  In extreme
      cases this could lead to <quote>maximum total lexeme length
      exceeded</quote> failures for vectors that were under the length
      limit when emitted.  In any case it could lead to wasted space
      on-disk.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [ae10dbb0c] 2023-09-04 14:55:37 +0900
Branch: REL_16_STABLE Release: REL_16_0 [fac3fa0d5] 2023-09-04 14:55:49 +0900
Branch: REL_15_STABLE [88aa4a049] 2023-09-04 14:55:51 +0900
Branch: REL_14_STABLE [df11421d8] 2023-09-04 14:55:53 +0900
Branch: REL_13_STABLE [82fa8ae5f] 2023-09-04 14:55:55 +0900
Branch: REL_12_STABLE [40ddb8db9] 2023-09-04 14:55:57 +0900
Branch: REL_11_STABLE [358cd2b25] 2023-09-04 14:55:58 +0900
-->
     <para>
      Fix incorrect coding in <function>gtsvector_picksplit()</function>
      (Alexander Lakhin)
     </para>

     <para>
      This could lead to poor page-split decisions in GiST indexes
      on <type>tsvector</type> columns.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [48e2b234f] 2023-09-21 23:11:30 -0400
Branch: REL_16_STABLE [227c7cf15] 2023-09-21 23:11:30 -0400 !! no live bug
Branch: REL_15_STABLE [77dc81602] 2023-09-21 23:11:31 -0400 !! no live bug
Branch: REL_14_STABLE [10323f140] 2023-09-21 23:11:31 -0400
Branch: REL_13_STABLE [555a8d9d3] 2023-09-21 23:11:31 -0400
Branch: REL_12_STABLE [7cabb20a9] 2023-09-21 23:11:31 -0400
-->
     <para>
      Fix <command>COMMIT AND CHAIN</command>/<command>ROLLBACK AND
      CHAIN</command> to work properly when there is an unreleased
      savepoint (Liu Xiang, Tom Lane)
     </para>

     <para>
      Instead of propagating the current transaction's properties to the
      new transaction, they propagated some previous transaction's
      properties.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7704a1a72] 2023-11-02 11:47:33 -0400
Branch: REL_16_STABLE [82063edd4] 2023-11-02 11:47:33 -0400
Branch: REL_15_STABLE [ae33659d4] 2023-11-02 11:47:33 -0400
Branch: REL_14_STABLE [47c0f00cf] 2023-11-02 11:47:33 -0400
Branch: REL_13_STABLE [137227c6d] 2023-11-02 11:47:33 -0400
Branch: REL_12_STABLE [65810fc6d] 2023-11-02 11:47:33 -0400
Branch: REL_11_STABLE [6e1cca511] 2023-11-02 11:47:33 -0400 !! no live bug
-->
     <para>
      Avoid crash in <command>EXPLAIN</command> if a parameter marked to
      be displayed by <command>EXPLAIN</command> has a NULL boot-time
      value (Xing Guo, Aleksander Alekseev, Tom Lane)
     </para>

     <para>
      No built-in parameter fits this description, but an extension could
      define such a parameter.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [54b208f90] 2023-10-16 14:06:14 -0400
Branch: REL_16_STABLE [57e6e861d] 2023-10-16 14:06:15 -0400
Branch: REL_15_STABLE [0d1a7cd14] 2023-10-16 14:06:15 -0400
Branch: REL_14_STABLE [f6e1ee3cf] 2023-10-16 14:06:11 -0400
Branch: REL_13_STABLE [1e678175c] 2023-10-16 14:06:11 -0400
Branch: REL_12_STABLE [07eb22a77] 2023-10-16 14:06:11 -0400
Branch: REL_11_STABLE [a295684b8] 2023-10-16 14:06:12 -0400
-->
     <para>
      Ensure we have a snapshot while dropping <literal>ON COMMIT
      DROP</literal> temp tables (Tom Lane)
     </para>

     <para>
      This prevents possible misbehavior if any catalog entries for the
      temp tables have fields wide enough to require toasting (such as a
      very complex <literal>CHECK</literal> condition).
     </para>
    </listitem>

    <listitem>
<!--
Author: Nathan Bossart <nathan@postgresql.org>
Branch: master [97550c071] 2023-10-17 10:41:48 -0500
Branch: REL_16_STABLE [ee06199fc] 2023-10-17 10:41:58 -0500
Branch: REL_15_STABLE [c9265ae80] 2023-10-17 10:42:06 -0500
Branch: REL_14_STABLE [54fc9dca5] 2023-10-17 10:42:12 -0500
Branch: REL_13_STABLE [ac1dfc303] 2023-10-17 10:42:17 -0500
Branch: REL_12_STABLE [e2e169042] 2023-10-17 10:42:22 -0500
Branch: REL_11_STABLE [d0e7f95b4] 2023-10-17 10:42:28 -0500
Author: Nathan Bossart <nathan@postgresql.org>
Branch: REL_14_STABLE [555bc89c9] 2023-10-17 16:11:03 -0500
Branch: REL_13_STABLE [ebc093fa6] 2023-10-17 16:11:08 -0500
Branch: REL_12_STABLE [0e32652a7] 2023-10-17 16:11:13 -0500
Branch: REL_11_STABLE [bc322c73c] 2023-10-17 16:11:18 -0500
-->
     <para>
      Avoid improper response to shutdown signals in child processes
      just forked by <function>system()</function> (Nathan Bossart)
     </para>

     <para>
      This fix avoids a race condition in which a child process that has
      been forked off by <function>system()</function>, but hasn't yet
      exec'd the intended child program, might receive and act on a signal
      intended for the parent server process.  That would lead to
      duplicate cleanup actions being performed, which will not end well.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [63a582222] 2023-10-16 17:33:08 +1300
Branch: REL_16_STABLE [5725e4ebe] 2023-10-16 17:21:41 +1300
Branch: REL_15_STABLE [5e39884d3] 2023-10-16 17:23:02 +1300
Branch: REL_14_STABLE [dc75748a9] 2023-10-16 17:23:25 +1300
Branch: REL_13_STABLE [67060be3d] 2023-10-16 17:24:35 +1300
Branch: REL_12_STABLE [43c979086] 2023-10-16 17:25:43 +1300
-->
     <para>
      Cope with torn reads of <filename>pg_control</filename> in frontend
      programs (Thomas Munro)
     </para>

     <para>
      On some file systems, reading <filename>pg_control</filename> may
      not be an atomic action when the server concurrently writes that
      file.  This is detectable via a bad CRC.  Retry a few times to see
      if the file becomes valid before we report error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [c558e6fd9] 2023-10-16 10:43:47 +1300
Branch: REL_16_STABLE [2371432cd] 2023-10-16 10:45:05 +1300
Branch: REL_15_STABLE [606be8a35] 2023-10-16 10:45:18 +1300
Branch: REL_14_STABLE [a56fe5cf0] 2023-10-16 10:47:01 +1300
Branch: REL_13_STABLE [ae9da357b] 2023-10-16 10:47:10 +1300
Branch: REL_12_STABLE [637e86ecc] 2023-10-16 10:47:33 +1300
Branch: REL_11_STABLE [f1634c968] 2023-10-16 10:52:40 +1300
-->
     <para>
      Avoid torn reads of <filename>pg_control</filename> in relevant SQL
      functions (Thomas Munro)
     </para>

     <para>
      Acquire the appropriate lock before
      reading <filename>pg_control</filename>, to ensure we get a
      consistent view of that file.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [a956bd3fa] 2023-10-03 15:37:00 +0900
Branch: REL_16_STABLE [75f31a3f2] 2023-10-03 15:37:18 +0900
Branch: REL_15_STABLE [95e91da66] 2023-10-03 15:37:19 +0900
Branch: REL_14_STABLE [f91c87b31] 2023-10-03 15:37:21 +0900
Branch: REL_13_STABLE [a0b013625] 2023-10-03 15:37:23 +0900
Branch: REL_12_STABLE [9b3900cdb] 2023-10-03 15:37:24 +0900
-->
     <para>
      Avoid integer overflow when computing size of backend activity
      string array (Jakub Wartak)
     </para>

     <para>
      On 64-bit machines we will allow values
      of <varname>track_activity_query_size</varname> large enough to
      cause 32-bit overflow when multiplied by the allowed number of
      connections.  The code actually allocating the per-backend local
      array was careless about this though, and allocated the array
      incorrectly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [dc8d72c1c] 2023-09-25 14:42:17 -0400
Branch: REL_16_STABLE [055f786ea] 2023-09-25 14:42:17 -0400
Branch: REL_15_STABLE [0e59266a5] 2023-09-25 14:41:57 -0400
Branch: REL_14_STABLE [5cff431bc] 2023-09-25 14:41:57 -0400
Branch: REL_13_STABLE [8cfc3e80b] 2023-09-25 14:41:57 -0400
Branch: REL_12_STABLE [4435a8d5d] 2023-09-25 14:41:57 -0400
Branch: REL_11_STABLE [fdc7cf73b] 2023-09-25 14:41:57 -0400
-->
     <para>
      Track the dependencies of cached <command>CALL</command> statements,
      and re-plan them when needed (Tom Lane)
     </para>

     <para>
      DDL commands, such as replacement of a function that has been
      inlined into a <command>CALL</command> argument, can create the need
      to re-plan a <command>CALL</command> that has been cached by
      PL/pgSQL.  That was not happening, leading to misbehavior or strange
      errors such as <quote>cache lookup failed</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e0e492e5a] 2023-09-15 17:01:52 -0400
Branch: REL_16_STABLE [53630f12d] 2023-09-15 17:01:26 -0400
Branch: REL_15_STABLE [2679a107a] 2023-09-15 17:01:26 -0400
Branch: REL_14_STABLE [ae13f8166] 2023-09-15 17:01:26 -0400
Branch: REL_13_STABLE [c5b7f791d] 2023-09-15 17:01:26 -0400
Branch: REL_12_STABLE [d29812c0c] 2023-09-15 17:01:26 -0400
Branch: REL_11_STABLE [a374f6c61] 2023-09-15 17:01:26 -0400
-->
     <para>
      Track nesting depth correctly when
      inspecting <type>RECORD</type>-type Vars from outer query levels
      (Richard Guo)
     </para>

     <para>
      This oversight could lead to assertion failures, core dumps,
      or <quote>bogus varno</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_13_STABLE [59bc0dfe4] 2023-09-15 16:39:27 -0400
Branch: REL_12_STABLE [8a15b4178] 2023-09-15 16:39:27 -0400
Branch: REL_11_STABLE [479b99125] 2023-09-15 16:39:27 -0400
-->
     <para>
      Avoid <quote>record type has not been registered</quote> failure
      when deparsing a view that contains references to fields of
      composite constants (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_12_STABLE [2f02d4a2b] 2023-09-15 16:20:08 -0400
Branch: REL_11_STABLE [ece1154f4] 2023-09-15 16:20:08 -0400
-->
     <para>
      Allow extracting fields from
      a <type>RECORD</type>-type <literal>ROW()</literal> expression
      (Tom Lane)
     </para>

     <para>
      SQL code that knows that we name such
      fields <literal>f1</literal>, <literal>f2</literal>, etc can use
      those names to extract fields from the expression.  This change was
      originally made in version 13, and is now being back-patched into
      older branches to support tests for a related bug.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [3acd0599b] 2023-09-13 14:58:22 +1200
Branch: REL_16_STABLE [f899c7f1e] 2023-09-13 15:06:07 +1200
Branch: REL_15_STABLE [a26cc0334] 2023-09-13 14:43:04 +1200
Branch: REL_14_STABLE [e2452c2a6] 2023-09-13 14:46:16 +1200
Branch: REL_13_STABLE [189097db8] 2023-09-13 14:48:00 +1200
Branch: REL_12_STABLE [012b80ad2] 2023-09-13 14:50:14 +1200
Branch: REL_11_STABLE [6ae57f190] 2023-09-13 14:52:34 +1200
-->
     <para>
      Fix error-handling bug in <type>RECORD</type> type cache management
      (Thomas Munro)
     </para>

     <para>
      An out-of-memory error occurring at just the wrong point could leave
      behind inconsistent state that would lead to an infinite loop.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: REL_15_STABLE [c7256e656] 2023-09-12 10:23:17 +0530
Branch: REL_14_STABLE [f7d25117b] 2023-09-12 10:12:51 +0530
Branch: REL_13_STABLE [c570bb4d6] 2023-09-12 09:58:50 +0530
Branch: REL_12_STABLE [7e57208ed] 2023-09-12 09:44:37 +0530
Branch: REL_11_STABLE [feb4e218e] 2023-09-12 09:36:56 +0530
-->
     <para>
      Fix assertion failure when logical decoding is retried in the same
      session after an error (Hou Zhijie)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [6b18b3fe2] 2023-10-03 10:21:44 +0900
Branch: REL_16_STABLE [a06efbc3a] 2023-10-03 10:25:12 +0900
Branch: REL_15_STABLE [afc79591d] 2023-10-03 10:25:14 +0900
Branch: REL_14_STABLE [baeb8542c] 2023-10-03 10:25:15 +0900
Branch: REL_13_STABLE [6103d2cca] 2023-10-03 10:25:17 +0900
Branch: REL_12_STABLE [22b2e6e9d] 2023-10-03 10:25:19 +0900
-->
     <para>
      Treat out-of-memory failures as fatal while reading WAL
      (Michael Paquier)
     </para>

     <para>
      Previously this would be treated as a bogus-data condition, leading
      to the conclusion that we'd reached the end of WAL, which is
      incorrect and could lead to inconsistent WAL replay.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [bae868caf] 2023-09-23 10:26:24 +1200
Branch: REL_16_STABLE [ce497f648] 2023-09-23 10:27:02 +1200
Branch: REL_15_STABLE [f4d152edd] 2023-09-23 10:28:12 +1200
Branch: REL_14_STABLE [3ce3b53d7] 2023-09-23 10:28:40 +1200
Branch: REL_13_STABLE [6606c5716] 2023-09-23 10:29:44 +1200
Branch: REL_12_STABLE [e8f3c0687] 2023-09-23 10:29:56 +1200
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [becfbdd6c] 2023-09-26 10:53:38 +1300
Branch: REL_16_STABLE [10d0591ea] 2023-09-26 10:53:52 +1300
Branch: REL_15_STABLE [99d334a18] 2023-09-26 10:54:02 +1300
Branch: REL_14_STABLE [3d413c5a7] 2023-09-26 10:54:24 +1300
Branch: REL_13_STABLE [45d1fe8b5] 2023-09-26 10:54:47 +1300
Branch: REL_12_STABLE [bde2f1847] 2023-09-26 10:59:49 +1300
-->
     <para>
      Fix possible recovery failure due to trying to allocate memory based
      on a bogus WAL record length field (Thomas Munro, Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: REL_14_STABLE [2f13e8d9e] 2023-09-12 09:35:42 +0900
Branch: REL_13_STABLE [5dc093eac] 2023-09-12 09:35:51 +0900
Branch: REL_12_STABLE [7b03d3a3b] 2023-09-12 09:35:57 +0900
-->
     <para>
      Ensure that standby-mode WAL recovery reports an error when an
      invalid page header is found (Yugo Nagata, Kyotaro Horiguchi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d8b2fcc9d] 2023-08-24 12:02:46 -0400
Branch: REL_16_STABLE Release: REL_16_0 [ba0d737ca] 2023-08-24 12:02:40 -0400
Branch: REL_15_STABLE [870085135] 2023-08-24 12:02:40 -0400
Branch: REL_14_STABLE [9b2a41db1] 2023-08-24 12:02:40 -0400
Branch: REL_13_STABLE [27566bcf3] 2023-08-24 12:02:40 -0400
Branch: REL_12_STABLE [b808dbf90] 2023-08-24 12:02:40 -0400
Branch: REL_11_STABLE [9c59f3862] 2023-08-24 12:02:40 -0400
-->
     <para>
      Avoid doing plan cache revalidation of utility statements
      that do not receive interesting processing during parse analysis
      (Tom Lane)
     </para>

     <para>
      Aside from saving a few cycles, this prevents failure after a cache
      invalidation for statements that must not set a snapshot, such
      as <command>SET TRANSACTION ISOLATION LEVEL</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [a68458108] 2023-08-22 15:17:05 -0400
Branch: REL_16_STABLE Release: REL_16_0 [f938acd68] 2023-08-22 15:18:19 -0400
Branch: REL_15_STABLE [75f323aa1] 2023-08-22 15:16:01 -0400
Branch: REL_14_STABLE [7f4515a58] 2023-08-22 15:15:45 -0400
Branch: REL_13_STABLE [1bb619d4d] 2023-08-22 15:15:31 -0400
Branch: REL_12_STABLE [01993ac74] 2023-08-22 15:15:18 -0400
Branch: REL_11_STABLE [2d13dab04] 2023-08-23 17:22:16 -0400
Branch: REL_11_STABLE [b915bf495] 2023-08-24 16:14:26 -0400
-->
     <para>
      Keep by-reference <structfield>attmissingval</structfield> values in
      a long-lived context while they are being used (Andrew Dunstan)
     </para>

     <para>
      This avoids possible use of dangling pointers when a tuple slot
      outlives the tuple descriptor with which its value was constructed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [fa2e87494] 2023-08-09 13:09:25 -0700
Branch: REL_16_STABLE Release: REL_16_0 [0d56c32c8] 2023-08-09 13:09:01 -0700
Branch: REL_15_STABLE [9f3343e40] 2023-08-07 15:12:49 -0700
Branch: REL_14_STABLE [00953f1e2] 2023-08-07 15:12:33 -0700
Branch: REL_13_STABLE [90cadfd49] 2023-08-07 15:12:09 -0700
Branch: REL_12_STABLE [a86d40227] 2023-08-07 15:11:18 -0700
Branch: REL_11_STABLE [43ba5105a] 2023-08-07 15:09:11 -0700
Branch: master [bee263b08] 2023-08-10 10:20:54 -0700
Branch: REL_16_STABLE Release: REL_16_0 [7bed93a46] 2023-08-10 10:24:58 -0700
Branch: REL_15_STABLE [1bc19dfcf] 2023-08-10 10:25:47 -0700
Branch: REL_14_STABLE [5a32af3f2] 2023-08-10 10:26:12 -0700
Branch: REL_13_STABLE [4caa9e33e] 2023-08-10 10:26:46 -0700
Branch: REL_12_STABLE [01bc42634] 2023-08-10 10:27:00 -0700
Branch: REL_11_STABLE [ae1269295] 2023-08-10 10:27:24 -0700
-->
     <para>
      Recalculate the effective value of <varname>search_path</varname>
      after <command>ALTER ROLE</command> (Jeff Davis)
     </para>

     <para>
      This ensures that after renaming a role, the meaning of the special
      string <literal>$user</literal> is re-determined.
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [ef74c7197] 2023-10-10 11:01:13 -0700
Branch: REL_16_STABLE [b8963e8a2] 2023-10-10 11:01:55 -0700
Branch: REL_15_STABLE [b9bb02620] 2023-10-10 11:02:45 -0700
Branch: REL_14_STABLE [6615bb95a] 2023-10-10 11:02:56 -0700
Branch: REL_13_STABLE [469d367be] 2023-10-10 11:03:03 -0700
Branch: REL_12_STABLE [6dbd01b9f] 2023-10-10 11:03:10 -0700
Branch: REL_11_STABLE [04f0baa85] 2023-10-10 11:03:20 -0700
-->
     <para>
      Fix order of operations in <function>GenericXLogFinish</function>
      (Jeff Davis)
     </para>

     <para>
      This code violated the conditions required for crash safety by
      writing WAL before marking changed buffers dirty.  No core code uses
      this function, but extensions do (<filename>contrib/bloom</filename>
      does, for example).
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [af5b3c3d1] 2023-09-19 08:31:06 +0900
Branch: REL_16_STABLE [f171430f0] 2023-09-19 08:31:22 +0900
Branch: REL_15_STABLE [9e0ce80f3] 2023-09-19 08:31:24 +0900
Branch: REL_14_STABLE [bb65f3c1b] 2023-09-19 08:31:26 +0900
Branch: REL_13_STABLE [35e8ba3e5] 2023-09-19 08:31:27 +0900
Branch: REL_12_STABLE [99d27e55c] 2023-09-19 08:31:29 +0900
Branch: REL_11_STABLE [ddded779a] 2023-09-19 08:31:31 +0900
-->
     <para>
      Remove incorrect assertion in PL/Python exception handling
      (Alexander Lakhin)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [06c0c3688] 2023-10-02 13:27:58 -0400
Branch: REL_16_STABLE [aaaf8fbb6] 2023-10-02 13:27:51 -0400
Branch: REL_15_STABLE [10e705bd2] 2023-10-02 13:27:51 -0400
Branch: REL_14_STABLE [829d91cc6] 2023-10-02 13:27:51 -0400
Branch: REL_13_STABLE [295953f8b] 2023-10-02 13:27:51 -0400
Branch: REL_12_STABLE [c02f29758] 2023-10-02 13:27:51 -0400
Branch: REL_11_STABLE [4f16152d9] 2023-10-02 13:27:51 -0400
-->
     <para>
      Fix <application>pg_restore</application> so that selective restores
      will include both table-level and column-level ACLs for selected
      tables (Euler Taveira, Tom Lane)
     </para>

     <para>
      Formerly, only the table-level ACL would get restored if both types
      were present.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [2e3dc8c14] 2023-09-25 14:27:33 +0200
Branch: REL_16_STABLE [fb9ddd0fa] 2023-09-25 14:34:06 +0200
Branch: REL_15_STABLE [8845d8597] 2023-09-25 14:34:06 +0200
Branch: REL_14_STABLE [26c291a15] 2023-09-25 14:34:06 +0200
Branch: REL_13_STABLE [d3946c4f6] 2023-09-25 14:34:05 +0200
Branch: REL_12_STABLE [af9f6cd1d] 2023-09-25 14:34:05 +0200
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: REL_15_STABLE [04d2d605f] 2023-11-03 12:07:11 -0400
Branch: REL_14_STABLE [f9280e77e] 2023-11-03 12:07:25 -0400
Branch: REL_13_STABLE [2f1f49975] 2023-11-03 12:07:35 -0400
Branch: REL_12_STABLE [d3246a2ad] 2023-11-03 12:07:40 -0400
-->
     <para>
      Add logic to <application>pg_upgrade</application> to check for use
      of <type>abstime</type>, <type>reltime</type>,
      and <type>tinterval</type> data types (&Aacute;lvaro Herrera)
     </para>

     <para>
      These obsolete data types were removed
      in <productname>PostgreSQL</productname> version 12, so check to
      make sure they aren't present in an older database before claiming
      it can be upgraded.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [e1c6db630] 2023-09-07 14:12:18 +0900
Branch: REL_16_STABLE Release: REL_16_0 [105795843] 2023-09-07 14:12:25 +0900
Branch: REL_15_STABLE [574bff7bd] 2023-09-07 14:12:29 +0900
Branch: REL_14_STABLE [9de74ca70] 2023-09-07 14:12:31 +0900
Branch: REL_13_STABLE [6cdd7b805] 2023-09-07 14:12:33 +0900
Branch: REL_12_STABLE [2fe968ce9] 2023-09-07 14:12:34 +0900
Branch: REL_11_STABLE [dbd1a06c9] 2023-09-07 14:12:36 +0900
-->
     <para>
      Avoid generating invalid temporary slot names
      in <application>pg_basebackup</application> (Jelte Fennema)
     </para>

     <para>
      This has only been seen to occur when the server connection runs
      through <application>pgbouncer</application>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [90ebcc32d] 2023-10-14 15:54:46 -0700
Branch: REL_16_STABLE [06ff06484] 2023-10-14 15:54:49 -0700
Branch: REL_15_STABLE [1102f4ece] 2023-10-14 15:54:49 -0700
Branch: REL_14_STABLE [0df88a686] 2023-10-14 15:54:49 -0700
Branch: REL_13_STABLE [3895e9153] 2023-10-14 15:54:50 -0700
Branch: REL_12_STABLE [73cda80a3] 2023-10-14 15:54:50 -0700
-->
     <para>
      Avoid false <quote>too many client connections</quote> errors
      in <application>pgbench</application> on Windows (Noah Misch)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [6ec9e9975] 2023-10-30 14:46:05 -0700
Branch: REL_16_STABLE [3c6a05b80] 2023-10-30 14:46:08 -0700
Branch: REL_15_STABLE [6f81386a9] 2023-10-30 14:46:08 -0700
Branch: REL_14_STABLE [42496cba6] 2023-10-30 14:46:09 -0700
Branch: REL_13_STABLE [f31ccb575] 2023-10-30 14:46:09 -0700
Branch: REL_12_STABLE [3a205c916] 2023-10-30 14:46:09 -0700
Branch: REL_11_STABLE [e04509f32] 2023-10-30 14:46:09 -0700
-->
     <para>
      In <filename>contrib/amcheck</filename>, do not report interrupted
      page deletion as corruption (Noah Misch)
     </para>

     <para>
      This fix prevents false-positive reports of <quote>the first child
      of leftmost target page is not leftmost of its
      level</quote>, <quote>block NNNN is not leftmost</quote>
      or <quote>left link/right link pair in index XXXX not in
      agreement</quote>.  They appeared
      if <application>amcheck</application> ran after an unfinished btree
      index page deletion and before <command>VACUUM</command> had cleaned
      things up.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [849172ff4] 2023-10-29 11:14:37 +0000
Branch: REL_16_STABLE [ab73a37e9] 2023-10-29 11:14:36 +0000
Branch: REL_15_STABLE [5f0691839] 2023-10-29 11:14:35 +0000
Branch: REL_14_STABLE [162b38a06] 2023-10-29 11:14:34 +0000
Branch: REL_13_STABLE [35e6a5c20] 2023-10-29 11:14:34 +0000
Branch: REL_12_STABLE [f7cd7b265] 2023-10-29 11:14:33 +0000
Branch: REL_11_STABLE [c804ffb56] 2023-10-29 11:14:32 +0000
-->
     <para>
      Fix failure of <filename>contrib/btree_gin</filename> indexes
      on <type>interval</type> columns,
      when an indexscan using the <literal>&lt;</literal>
      or <literal>&lt;=</literal> operator is performed (Dean Rasheed)
     </para>

     <para>
      Such an indexscan failed to return all the entries it should.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [76200e5ee] 2023-10-19 05:13:23 +1300
Branch: REL_16_STABLE [774185056] 2023-10-19 05:14:07 +1300
Branch: REL_15_STABLE [b60e3ac76] 2023-10-19 05:15:38 +1300
Branch: REL_14_STABLE [0a8b7d5c1] 2023-10-19 05:16:00 +1300
Branch: REL_13_STABLE [53c4dabe1] 2023-10-19 05:16:24 +1300
Branch: REL_12_STABLE [7da915e33] 2023-10-19 05:17:27 +1300
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [37d5babb5] 2023-10-18 22:47:23 +1300
Branch: REL_16_STABLE [74d19ec09] 2023-10-18 22:53:56 +1300
Branch: REL_15_STABLE [eed1feb3f] 2023-10-18 22:59:46 +1300
Branch: REL_14_STABLE [82d9a782a] 2023-10-18 23:04:09 +1300
Branch: REL_13_STABLE [f28956b23] 2023-10-18 23:16:48 +1300
Branch: REL_12_STABLE [15ddc9725] 2023-10-18 23:18:16 +1300
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [f90b4a846] 2023-10-19 03:01:55 +1300
Branch: REL_16_STABLE [60596f148] 2023-10-19 03:07:18 +1300
Branch: REL_15_STABLE [b2e097788] 2023-10-19 03:03:27 +1300
Branch: REL_14_STABLE [ee3e4c41f] 2023-10-19 03:03:46 +1300
Branch: REL_13_STABLE [981292c19] 2023-10-19 03:04:00 +1300
Branch: REL_12_STABLE [d701f0d1f] 2023-10-19 03:04:09 +1300
Author: Thomas Munro <tmunro@postgresql.org>
Branch: REL_13_STABLE [7c070e224] 2023-10-24 11:23:08 +1300
Branch: REL_12_STABLE [9ad986276] 2023-10-24 11:23:21 +1300
-->
     <para>
      Add support for LLVM 16 and 17 (Thomas Munro, Dmitry Dolgov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [06843df4a] 2023-09-29 14:07:30 -0400
Branch: REL_16_STABLE [75c562653] 2023-09-29 14:07:30 -0400
Branch: REL_15_STABLE [be3398ea1] 2023-09-29 14:07:30 -0400
Branch: REL_14_STABLE [e9d1560d3] 2023-09-29 14:07:30 -0400
Branch: REL_13_STABLE [1b64e374c] 2023-09-29 14:07:30 -0400
Branch: REL_12_STABLE [d8ceb98e4] 2023-09-29 14:07:30 -0400
Branch: REL_11_STABLE [4d10fda52] 2023-09-29 14:07:30 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3aa021b29] 2023-09-26 21:06:21 -0400
Branch: REL_16_STABLE [e73d6a0df] 2023-09-26 21:06:21 -0400
Branch: REL_15_STABLE [78f17fb97] 2023-09-26 21:06:21 -0400
Branch: REL_14_STABLE [5d60e8ed3] 2023-09-26 21:06:21 -0400
Branch: REL_13_STABLE [53cc19bfa] 2023-09-26 21:06:21 -0400
Branch: REL_12_STABLE [abe423712] 2023-09-26 21:06:21 -0400
Branch: REL_11_STABLE [0e0de20c8] 2023-09-26 21:06:21 -0400
-->
     <para>
      Suppress assorted build-time warnings on
      recent <productname>macOS</productname> (Tom Lane)
     </para>

     <para>
      <productname>Xcode 15</productname> (released
      with <productname>macOS Sonoma</productname>) changed the linker's
      behavior in a way that causes many duplicate-library warnings while
      building <productname>PostgreSQL</productname>.  These were
      harmless, but they're annoying so avoid citing the same libraries
      twice.  Also remove use of the <option>-multiply_defined
      suppress</option> linker switch, which apparently has been a no-op
      for a long time, and is now actively complained of.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5fd3e06f6] 2023-10-28 11:54:40 -0400
Branch: REL_16_STABLE [d1537afe3] 2023-10-28 11:54:51 -0400
Branch: REL_15_STABLE [85b98a70b] 2023-10-28 11:54:59 -0400
Branch: REL_14_STABLE [877e7b4b9] 2023-10-28 11:55:06 -0400
Branch: REL_13_STABLE [d94612873] 2023-10-28 11:55:14 -0400
Branch: REL_12_STABLE [7180bb827] 2023-10-28 11:55:22 -0400
Branch: REL_11_STABLE [64fc5e005] 2023-10-28 11:55:30 -0400
-->
     <para>
      Remove <literal>PHOT</literal> (Phoenix Islands Time) from the
      default timezone abbreviations list (Tom Lane)
     </para>

     <para>
      Presence of this abbreviation in the default list can cause failures
      on recent Debian and Ubuntu releases, as they no longer install the
      underlying tzdb entry by default.  Since this is a made-up
      abbreviation for a zone with a total human population of about two
      dozen, it seems unlikely that anyone will miss it.  If someone does,
      they can put it back via a custom abbreviations file.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-16">
  <title>Release 12.16</title>

  <formalpara>
  <title>Release date:</title>
  <para>2023-08-10</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.15.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.16</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you use BRIN indexes, it may be advisable to reindex them;
    see the second changelog entry below.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 12.10,
    see <xref linkend="release-12-10"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [cd5f2a357] 2023-08-07 06:05:56 -0700
Branch: REL_16_STABLE [f53511010] 2023-08-07 06:05:59 -0700
Branch: REL_15_STABLE [de494ec14] 2023-08-07 06:06:00 -0700
Branch: REL_14_STABLE [d4648a74b] 2023-08-07 06:06:00 -0700
Branch: REL_13_STABLE [b1b585e0f] 2023-08-07 06:06:00 -0700
Branch: REL_12_STABLE [eb044d8f0] 2023-08-07 06:06:00 -0700
Branch: REL_11_STABLE [919ebb023] 2023-08-07 06:06:01 -0700
-->
     <para>
      Disallow substituting a schema or owner name into an extension script
      if the name contains a quote, backslash, or dollar sign (Noah Misch)
     </para>

     <para>
      This restriction guards against SQL-injection hazards for trusted
      extensions.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks Micah Gates,
      Valerie Woolard, Tim Carey-Smith, and Christoph Berg for reporting
      this problem.
      (CVE-2023-39417)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master Release: REL_16_BR [3581cbdcd] 2023-05-19 01:29:44 +0200
Branch: REL_15_STABLE [e18769323] 2023-05-19 00:15:13 +0200
Branch: REL_14_STABLE [40d465caf] 2023-05-19 00:15:00 +0200
Branch: REL_13_STABLE [6c512fc6e] 2023-05-19 00:14:05 +0200
Branch: REL_12_STABLE [d78a66d92] 2023-05-19 00:16:13 +0200
Branch: REL_11_STABLE [fc7dc728d] 2023-05-19 00:21:05 +0200
Branch: master Release: REL_16_BR [3ec8a3bfb] 2023-05-18 23:33:23 +0200
Branch: REL_15_STABLE [80f64b900] 2023-05-18 23:33:45 +0200
Branch: REL_14_STABLE [3f1356e5d] 2023-05-18 23:34:10 +0200
Branch: REL_13_STABLE [2b1ab28b9] 2023-05-18 23:34:35 +0200
Branch: REL_12_STABLE [d42ffda68] 2023-05-18 23:34:56 +0200
Branch: REL_11_STABLE [b511d7323] 2023-05-18 23:35:16 +0200
-->
     <para>
      Fix confusion between empty (no rows) ranges and all-NULL ranges in
      BRIN indexes, as well as incorrect merging of all-NULL summaries
      (Tomas Vondra)
     </para>

     <para>
      Each of these oversights could result in forgetting that a BRIN
      index range contains any NULL values, potentially allowing
      subsequent queries that should return NULL values to miss doing so.
     </para>

     <para>
      This fix will not in itself correct faulty BRIN entries.
      It's recommended to <command>REINDEX</command> any BRIN indexes that
      may be used to search for nulls.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [c66a7d75e] 2023-07-13 13:03:28 -0700
Branch: REL_16_STABLE [a4b4cc1d6] 2023-07-13 13:03:30 -0700
Branch: REL_15_STABLE [f66403749] 2023-07-13 13:04:45 -0700
Branch: REL_14_STABLE [d11efe830] 2023-07-13 13:03:33 -0700
Branch: REL_13_STABLE [81ce00006] 2023-07-13 13:03:34 -0700
Branch: REL_12_STABLE [034a9fcd2] 2023-07-13 13:03:36 -0700
Branch: REL_11_STABLE [1c38e7ae1] 2023-07-13 13:03:37 -0700
-->
     <para>
      Avoid leaving a corrupted database behind when <command>DROP
      DATABASE</command> is interrupted (Andres Freund)
     </para>

     <para>
      If <command>DROP DATABASE</command> was interrupted after it had
      already begun taking irreversible steps, the target database
      remained accessible (because the removal of
      its <structname>pg_database</structname> row would roll back),
      but it would have corrupt contents.  Fix by marking the database
      as inaccessible before we begin to perform irreversible operations.
      A failure after that will leave the database still partially
      present, but nothing can be done with it except to issue
      another <command>DROP DATABASE</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [cfc43aeb3] 2023-06-30 13:54:48 +0900
Branch: REL_16_STABLE [f4691e2e7] 2023-06-30 13:54:53 +0900
Branch: REL_15_STABLE [cb4ac3e56] 2023-06-30 13:54:55 +0900
Branch: REL_14_STABLE [663b35f2d] 2023-06-30 13:54:56 +0900
Branch: REL_13_STABLE [537b70b82] 2023-06-30 13:54:59 +0900
Branch: REL_12_STABLE [dbe0e5c56] 2023-06-30 13:55:02 +0900
Branch: REL_11_STABLE [c75c33de5] 2023-06-30 13:55:07 +0900
-->
     <para>
      Ensure that partitioned indexes are correctly marked as valid or not
      at creation (Michael Paquier)
     </para>

     <para>
      If a new partitioned index matches an existing but invalid index on
      one of the partitions, the partitioned index could end up being
      marked valid prematurely.  This could lead to misbehavior or
      assertion failures in subsequent queries on the partitioned table.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_16_BR [fc55c7ff8] 2023-06-28 15:57:31 +0900
Branch: REL_15_STABLE [7aa17b498] 2023-06-28 15:57:43 +0900
Branch: REL_14_STABLE [6160e221d] 2023-06-28 15:57:48 +0900
Branch: REL_13_STABLE [f42844069] 2023-06-28 15:57:51 +0900
Branch: REL_12_STABLE [63b292e73] 2023-06-28 15:57:53 +0900
Branch: REL_11_STABLE [e90e9275f] 2023-06-28 15:57:55 +0900
-->
     <para>
      Ignore invalid child indexes when matching partitioned indexes to
      child indexes during <command>ALTER TABLE ATTACH PARTITION</command>
      (Michael Paquier)
     </para>

     <para>
      Such an index will now be ignored, and a new child index created
      instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [38ea6aa90] 2023-07-14 10:12:48 +0900
Branch: REL_16_STABLE [31f9d41d6] 2023-07-14 10:13:14 +0900
Branch: REL_15_STABLE [c0dc97c7b] 2023-07-14 10:13:15 +0900
Branch: REL_14_STABLE [954cc2139] 2023-07-14 10:13:17 +0900
Branch: REL_13_STABLE [c89d74c18] 2023-07-14 10:13:20 +0900
Branch: REL_12_STABLE [f1d6bcdd8] 2023-07-14 10:13:21 +0900
Branch: REL_11_STABLE [ed2b58c15] 2023-07-14 10:13:22 +0900
-->
     <para>
      Fix possible failure when marking a partitioned index valid after
      all of its partitions have been attached (Michael Paquier)
     </para>

     <para>
      The update of the index's <structname>pg_index</structname> entry
      could use stale data for other columns.  One reported symptom is
      an <quote>attempted to update invisible tuple</quote> error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [bd5ddbe86] 2023-07-10 09:40:07 +0900
Branch: REL_16_STABLE [55c95f24c] 2023-07-10 09:40:12 +0900
Branch: REL_15_STABLE [d1e0f408c] 2023-07-10 09:40:14 +0900
Branch: REL_14_STABLE [235e716bc] 2023-07-10 09:40:15 +0900
Branch: REL_13_STABLE [f5b075adc] 2023-07-10 09:40:17 +0900
Branch: REL_12_STABLE [02021f1b2] 2023-07-10 09:40:22 +0900
Branch: REL_11_STABLE [914e72e6e] 2023-07-10 09:40:24 +0900
-->
     <para>
      Fix <command>ALTER EXTENSION SET SCHEMA</command> to complain if the
      extension contains any objects outside the extension's schema
      (Michael Paquier, Heikki Linnakangas)
     </para>

     <para>
      Erroring out if the extension contains objects in multiple schemas
      was always intended; but the check was mis-coded so that it would
      fail to detect some cases, leading to surprising behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master Release: REL_16_BR [7fcd7ef2a] 2023-06-19 13:00:42 +1200
Branch: REL_15_STABLE [8f2ec8cc7] 2023-06-19 13:01:29 +1200
Branch: REL_14_STABLE [73f1c17fc] 2023-06-19 13:01:58 +1200
Branch: REL_13_STABLE [06286f8a2] 2023-06-19 13:02:24 +1200
Branch: REL_12_STABLE [dcef5b052] 2023-06-19 13:02:52 +1200
Branch: REL_11_STABLE [f6345f03f] 2023-06-19 13:03:17 +1200
-->
     <para>
      Don't use partial unique indexes for uniqueness proofs in the
      planner (David Rowley)
     </para>

     <para>
      This could give rise to incorrect plans, since the presumed
      uniqueness of rows read from a table might not hold if the index in
      question isn't used to scan the table.
     </para>
    </listitem>

    <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
Branch: master [6f80a8d9c] 2023-07-28 15:45:00 +0900
Branch: REL_16_STABLE [695f5deb7] 2023-07-28 15:45:01 +0900
Branch: REL_15_STABLE [d1ef5631e] 2023-07-28 15:45:02 +0900
Branch: REL_14_STABLE [b0e390e6d] 2023-07-28 15:45:04 +0900
Branch: REL_13_STABLE [730f983ef] 2023-07-28 15:45:06 +0900
Branch: REL_12_STABLE [9edf72aa7] 2023-07-28 15:45:08 +0900
Branch: REL_11_STABLE [db01f2696] 2023-07-28 15:45:09 +0900
-->
     <para>
      Avoid producing incorrect plans for foreign joins with
      pseudoconstant join clauses (Etsuro Fujita)
     </para>

     <para>
      The planner currently lacks support for attaching pseudoconstant
      join clauses to a pushed-down remote join, so disable generation
      of remote joins in such cases.  (A better solution will require
      ABI-breaking changes of planner data structures, so it will have to
      wait for a future major release.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_16_BR [792213f2e] 2023-06-13 15:58:43 -0400
Branch: REL_15_STABLE [cc6974df1] 2023-06-13 15:58:37 -0400
Branch: REL_14_STABLE [d1423c52e] 2023-06-13 15:58:37 -0400
Branch: REL_13_STABLE [a36d0014f] 2023-06-13 15:58:37 -0400
Branch: REL_12_STABLE [b4110bdbf] 2023-06-13 15:58:37 -0400
Branch: REL_11_STABLE [13192a324] 2023-06-13 15:58:37 -0400
-->
     <para>
      Correctly handle sub-SELECTs in RLS policy expressions and
      security-barrier views when expanding rule actions (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [126552c85] 2023-07-04 09:07:31 +1200
Branch: REL_16_STABLE [12529028a] 2023-07-04 09:04:35 +1200
Branch: REL_15_STABLE [d34aa0a2f] 2023-07-04 09:10:37 +1200
Branch: REL_14_STABLE [fb663f387] 2023-07-04 09:14:16 +1200
Branch: REL_13_STABLE [fc1547384] 2023-07-04 09:20:55 +1200
Branch: REL_12_STABLE [255a925d3] 2023-07-04 09:21:33 +1200
Branch: REL_11_STABLE [13f127800] 2023-07-04 09:40:30 +1200
Branch: master [bcc93a389] 2023-07-04 09:07:31 +1200
Branch: REL_16_STABLE [d03d9a261] 2023-07-04 09:04:35 +1200
Branch: REL_15_STABLE [ab265e985] 2023-07-04 09:10:37 +1200
Branch: REL_14_STABLE [3f7d3a77e] 2023-07-04 09:14:16 +1200
Branch: REL_13_STABLE [8976ac5c5] 2023-07-04 09:20:55 +1200
Branch: REL_12_STABLE [17b8887c2] 2023-07-04 09:21:33 +1200
Branch: REL_11_STABLE [814f3c8e4] 2023-07-04 09:40:30 +1200
Branch: master [f9b7fc651] 2023-07-04 09:07:31 +1200
Branch: REL_16_STABLE [0cb1fb2c9] 2023-07-04 09:04:35 +1200
Branch: REL_15_STABLE [0f275b0ee] 2023-07-04 09:10:37 +1200
Branch: REL_14_STABLE [ae6d536ed] 2023-07-04 09:14:16 +1200
Branch: REL_13_STABLE [8f705d7b9] 2023-07-04 09:20:55 +1200
Branch: REL_12_STABLE [fe88497b4] 2023-07-04 09:21:33 +1200
Branch: REL_11_STABLE [0048c3b51] 2023-07-04 09:27:00 +1200
-->
     <para>
      Fix race conditions in conflict detection
      for <literal>SERIALIZABLE</literal> isolation mode
      (Thomas Munro)
     </para>

     <para>
      Conflicts could be missed when using bitmap heap scans, when using
      GIN indexes, and when examining an initially-empty btree index.
      All these cases could lead to serializability failures due to
      improperly allowing conflicting transactions to commit.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_16_BR [45392626c] 2023-06-20 17:47:53 -0400
Branch: REL_15_STABLE [c2f974fff] 2023-06-20 17:47:53 -0400
Branch: REL_14_STABLE [d911dce14] 2023-06-20 17:47:36 -0400
Branch: REL_13_STABLE [2f97105e9] 2023-06-20 17:47:36 -0400
Branch: REL_12_STABLE [9529b1eb1] 2023-06-20 17:47:36 -0400
-->
     <para>
      Fix hash join with an inner-side hash key that contains Params
      coming from an outer nested loop (Tom Lane)
     </para>

     <para>
      When rescanning the join after the values of such Params have
      changed, we must rebuild the hash table, but neglected to do so.
      This could result in missing join output rows.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_16_BR [43af714de] 2023-06-29 10:19:10 -0400
Branch: REL_15_STABLE [cc8cca3c2] 2023-06-29 10:19:10 -0400
Branch: REL_14_STABLE [0789b82a9] 2023-06-29 10:19:10 -0400
Branch: REL_13_STABLE [d0ab203bc] 2023-06-29 10:19:10 -0400
Branch: REL_12_STABLE [53b93e853] 2023-06-29 10:19:10 -0400
Branch: REL_11_STABLE [7f11b7a9c] 2023-06-29 10:19:10 -0400
-->
     <para>
      Fix intermittent failures when trying to update a field of a
      composite column (Tom Lane)
     </para>

     <para>
      If the overall value of the composite column is wide enough to
      require out-of-line toasting, then an unluckily-timed cache flush
      could cause errors or server crashes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master Release: REL_16_BR [f24523672] 2023-06-07 18:54:34 +0200
Branch: REL_15_STABLE [ee87f8b63] 2023-06-07 18:52:21 +0200
Branch: REL_14_STABLE [7f528e96c] 2023-06-07 18:53:04 +0200
Branch: REL_13_STABLE [c504aa857] 2023-06-07 18:53:16 +0200
Branch: REL_12_STABLE [54e1b8587] 2023-06-07 18:53:30 +0200
Branch: master [ce5aaea8c] 2023-07-02 22:21:02 +0200
Branch: REL_16_STABLE [9cf85093b] 2023-07-02 22:22:31 +0200
Branch: REL_15_STABLE [7ae4e7868] 2023-07-02 22:22:50 +0200
Branch: REL_14_STABLE [260dbf19a] 2023-07-02 22:23:04 +0200
Branch: REL_13_STABLE [984c23f6f] 2023-07-02 22:23:20 +0200
-->
     <para>
      Prevent query-lifespan memory leaks in some <command>UPDATE</command>
      queries with triggers (Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_16_BR [691594acd] 2023-06-24 17:18:08 -0400
Branch: REL_15_STABLE [a77d90171] 2023-06-24 17:18:08 -0400
Branch: REL_14_STABLE [4c61afa47] 2023-06-24 17:18:08 -0400
Branch: REL_13_STABLE [b6ab18a99] 2023-06-24 17:18:08 -0400
Branch: REL_12_STABLE [3b4580f5c] 2023-06-24 17:18:08 -0400
Branch: REL_11_STABLE [c7f33a197] 2023-06-24 17:18:08 -0400
-->
     <para>
      Prevent stack-overflow crashes with very complex text search
      patterns (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [38df84c65] 2023-07-27 11:56:35 -0400
Branch: REL_16_STABLE [de3f0e3fe] 2023-07-27 11:56:35 -0400
Branch: REL_15_STABLE [313ceda2f] 2023-07-27 12:07:48 -0400
Branch: REL_14_STABLE [341996248] 2023-07-27 12:07:48 -0400
Branch: REL_13_STABLE [288b4288c] 2023-07-27 12:07:48 -0400
Branch: REL_12_STABLE [0660f74e8] 2023-07-27 12:07:48 -0400
Branch: REL_11_STABLE [1d031ad54] 2023-07-27 12:07:48 -0400
-->
     <para>
      Allow tokens up to 10240 bytes long
      in <filename>pg_hba.conf</filename>
      and <filename>pg_ident.conf</filename> (Tom Lane)
     </para>

     <para>
      The previous limit of 256 bytes has been found insufficient for some
      use-cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [4f4d73466] 2023-07-05 13:13:13 +0300
Branch: REL_16_STABLE [dc0b58417] 2023-07-05 13:25:59 +0300
Branch: REL_15_STABLE [fa96a74a0] 2023-07-05 13:13:30 +0300
Branch: REL_14_STABLE [bfb493dba] 2023-07-05 13:13:35 +0300
Branch: REL_13_STABLE [59c2a6fe9] 2023-07-05 13:13:39 +0300
Branch: REL_12_STABLE [162aa47c3] 2023-07-05 13:14:24 +0300
Branch: REL_11_STABLE [2316ff1ae] 2023-07-05 13:14:33 +0300
-->
     <para>
      Fix mishandling of C++ out-of-memory conditions (Heikki Linnakangas)
     </para>

     <para>
      If JIT is in use, running out of memory in a
      C++ <function>new</function> call would lead to
      a <productname>PostgreSQL</productname> FATAL error, instead of the
      expected C++ exception.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [03f80daac] 2023-07-04 15:16:47 +1200
Branch: REL_16_STABLE [af8f9ec66] 2023-07-04 15:21:36 +1200
Branch: REL_15_STABLE [9ffb10f18] 2023-07-04 15:24:42 +1200
Branch: REL_14_STABLE [b7ec66731] 2023-07-04 15:26:42 +1200
Branch: REL_13_STABLE [a0003572f] 2023-07-04 15:28:29 +1200
Branch: REL_12_STABLE [74ad9b0d1] 2023-07-04 15:29:41 +1200
Branch: REL_11_STABLE [1605623ec] 2023-07-04 16:13:12 +1200
-->
     <para>
      Avoid losing track of possibly-useful shared memory segments when a
      page free results in coalescing ranges of free space (Dongming Liu)
     </para>

     <para>
      Ensure that the segment is moved into the
      appropriate <quote>bin</quote> for its new amount of free space, so
      that it will be found by subsequent searches.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master Release: REL_16_BR [5f0762f14] 2023-06-21 17:41:58 -0700
Branch: REL_15_STABLE [642bec1f8] 2023-06-21 17:41:56 -0700
Branch: REL_14_STABLE [63fa0deb3] 2023-06-21 17:41:54 -0700
Branch: REL_13_STABLE [b6311824f] 2023-06-21 17:41:52 -0700
Branch: REL_12_STABLE [355917c07] 2023-06-21 17:41:50 -0700
Branch: REL_11_STABLE [7ddba19eb] 2023-06-21 17:41:48 -0700
Branch: master Release: REL_16_BR [5abff197c] 2023-05-25 15:33:00 -0700
Branch: REL_15_STABLE [6983a5112] 2023-05-25 15:32:57 -0700
Branch: REL_14_STABLE [322c9b340] 2023-05-25 15:32:53 -0700
Branch: REL_13_STABLE [8f876d15c] 2023-05-25 15:32:50 -0700
Branch: REL_12_STABLE [188dad680] 2023-05-25 15:32:48 -0700
Branch: REL_11_STABLE [a72b503ca] 2023-05-25 15:32:45 -0700
-->
     <para>
      Allow <command>VACUUM</command> to continue after detecting certain
      types of b-tree index corruption (Peter Geoghegan)
     </para>

     <para>
      If an invalid sibling-page link is detected, log the issue and press
      on, rather than throwing an error as before.  Nothing short
      of <command>REINDEX</command> will fix the broken index, but
      preventing <command>VACUUM</command> from completing until that is
      done risks making matters far worse.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [83ecfa9fa] 2023-07-13 13:03:28 -0700
Branch: REL_16_STABLE [03ccc9569] 2023-07-13 13:03:30 -0700
Branch: REL_15_STABLE [82e97b864] 2023-07-13 13:03:31 -0700
Branch: REL_14_STABLE [e246fd423] 2023-07-13 13:03:33 -0700
Branch: REL_13_STABLE [53336e8f6] 2023-07-13 13:03:34 -0700
Branch: REL_12_STABLE [7aec84e4c] 2023-07-13 13:03:36 -0700
Branch: REL_11_STABLE [1386f0987] 2023-07-13 13:03:37 -0700
-->
     <para>
      Ensure that <varname>WrapLimitsVacuumLock</varname> is released
      after <command>VACUUM</command> detects invalid data
      in <structname>pg_database</structname>.<structfield>datfrozenxid</structfield>
      or <structname>pg_database</structname>.<structfield>datminmxid</structfield>
      (Andres Freund)
     </para>

     <para>
      Failure to release this lock could lead to a deadlock later,
      although the lock would be cleaned up if the session exits or
      encounters some other error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [cb0cca188] 2023-07-18 13:43:44 +0900
Branch: REL_16_STABLE [f88bc9f38] 2023-07-18 13:44:27 +0900
Branch: REL_15_STABLE [a878eff6b] 2023-07-18 13:44:29 +0900
Branch: REL_14_STABLE [442749100] 2023-07-18 13:44:31 +0900
Branch: REL_13_STABLE [db59108a2] 2023-07-18 13:44:33 +0900
Branch: REL_12_STABLE [d2ee542a2] 2023-07-18 13:44:34 +0900
Branch: REL_11_STABLE [bc0581f8f] 2023-07-18 13:44:35 +0900
Branch: master [4e465aac3] 2023-07-18 14:04:31 +0900
Branch: REL_16_STABLE [926aa6d11] 2023-07-18 14:04:46 +0900
Branch: REL_15_STABLE [f6ecd2622] 2023-07-18 14:04:48 +0900
Branch: REL_14_STABLE [763d26205] 2023-07-18 14:04:50 +0900
Branch: REL_13_STABLE [b3ca4f0a5] 2023-07-18 14:04:51 +0900
Branch: REL_12_STABLE [410a0d6bd] 2023-07-18 14:04:52 +0900
Branch: REL_11_STABLE [6c7bffc09] 2023-07-18 14:04:54 +0900
-->
     <para>
      Avoid double replay of prepared transactions during crash
      recovery (suyu.cmj, Michael Paquier)
     </para>

     <para>
      After a crash partway through a checkpoint with some two-phase
      transaction state data already flushed to disk by this checkpoint,
      crash recovery could attempt to replay the prepared transaction(s)
      twice, leading to a fatal error such as <quote>lock is already
      held</quote> in the startup process.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [4b4798e13] 2023-07-04 17:57:03 +0300
Branch: REL_16_STABLE [d431644b4] 2023-07-04 18:04:27 +0300
Branch: REL_15_STABLE [e24c02e4d] 2023-07-04 18:07:27 +0300
Branch: REL_14_STABLE [d85bf0719] 2023-07-04 18:07:46 +0300
Branch: REL_13_STABLE [acc8cdff4] 2023-07-04 18:08:08 +0300
Branch: REL_12_STABLE [1b4f1c6f8] 2023-07-04 18:08:26 +0300
Branch: REL_11_STABLE [6377f705c] 2023-07-04 18:08:40 +0300
-->
     <para>
      Ensure that a newly created, but still empty table
      is <function>fsync</function>'ed at the next checkpoint (Heikki
      Linnakangas)
     </para>

     <para>
      Without this, if there is an operating system crash causing the
      empty file to disappear, subsequent operations on the table might
      fail with <quote>could not open file</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [3142a8845] 2023-07-06 17:25:29 +0300
Branch: REL_16_STABLE [bf7b70e6b] 2023-07-06 17:28:50 +0300
Branch: REL_15_STABLE [25624c5d3] 2023-07-06 17:29:12 +0300
Branch: REL_14_STABLE [32f327f68] 2023-07-06 17:29:13 +0300
Branch: REL_13_STABLE [c50b869ed] 2023-07-06 17:29:14 +0300
Branch: REL_12_STABLE [80abec387] 2023-07-06 17:29:15 +0300
Branch: REL_11_STABLE [988719b88] 2023-07-06 17:29:16 +0300
-->
     <para>
      Ensure that creation of the init fork of an unlogged index is
      WAL-logged (Heikki Linnakangas)
     </para>

     <para>
      While an unlogged index's main data fork is not WAL-logged, its init
      fork should be, to ensure that we have a consistent state to restore
      the index to after a crash.  This step was missed if the init fork
      contains no data, which is a case not used by any standard index AM;
      but perhaps some extension behaves that way.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: REL_14_STABLE [c6043fcbb] 2023-06-11 10:33:46 +0900
Branch: REL_13_STABLE [37236ca06] 2023-06-11 10:33:56 +0900
Branch: REL_12_STABLE [9920552e1] 2023-06-11 10:33:59 +0900
Branch: REL_11_STABLE [a9c3472e0] 2023-06-11 10:34:00 +0900
-->
     <para>
      Fix missing reinitializations of delay-checkpoint-end flags
      (suyu.cmj)
     </para>

     <para>
      This could result in unnecessary delays of checkpoints, or in
      assertion failures in assert-enabled builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [deae1657e] 2023-08-02 01:39:47 +1200
Branch: REL_16_STABLE [b25acc302] 2023-08-02 01:40:27 +1200
Branch: REL_15_STABLE [67f3a697b] 2023-08-02 01:40:56 +1200
Branch: REL_14_STABLE [f457f2ef1] 2023-08-02 01:41:21 +1200
Branch: REL_13_STABLE [74a5bf1b6] 2023-08-02 01:41:55 +1200
Branch: REL_12_STABLE [668990980] 2023-08-02 01:44:31 +1200
-->
     <para>
      Fix overly strict assertion in <type>jsonpath</type> code
      (David Rowley)
     </para>

     <para>
      This assertion failed if a query applied
      the <literal>.type()</literal> operator to
      a <literal>like_regex</literal> result.
      There was no bug in non-assert builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_16_BR [555b929bb] 2023-06-21 11:07:24 -0400
Branch: REL_15_STABLE [cb74f7bec] 2023-06-21 11:07:11 -0400
Branch: REL_14_STABLE [120ea65b8] 2023-06-21 11:07:11 -0400
Branch: REL_13_STABLE [d1fc0f382] 2023-06-21 11:07:11 -0400
Branch: REL_12_STABLE [a98a04005] 2023-06-21 11:07:11 -0400
Branch: REL_11_STABLE [a8be2356c] 2023-06-21 11:07:11 -0400
-->
     <para>
      Avoid assertion failure when processing an empty statement via the
      extended query protocol in an already-aborted transaction (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_16_BR [1d369c9e9] 2023-05-16 10:53:42 -0400
Branch: REL_15_STABLE [eaf99e4c4] 2023-05-16 10:53:42 -0400
Branch: REL_14_STABLE [ccd362325] 2023-05-16 10:53:42 -0400
Branch: REL_13_STABLE [0409c7fc7] 2023-05-16 10:53:42 -0400
Branch: REL_12_STABLE [0966291a4] 2023-05-16 10:53:42 -0400
Branch: REL_11_STABLE [8084bf9a4] 2023-05-16 10:53:42 -0400
-->
     <para>
      Fix <filename>contrib/fuzzystrmatch</filename>'s
      Soundex <function>difference()</function> function to handle empty
      input sanely (Alexander Lakhin, Tom Lane)
     </para>

     <para>
      An input string containing no alphabetic characters resulted in
      unpredictable output.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_16_BR [d522b05c8] 2023-06-12 09:14:03 +0900
Branch: REL_15_STABLE [3a5222a43] 2023-06-12 09:14:13 +0900
Branch: REL_14_STABLE [e0e682945] 2023-06-12 09:14:14 +0900
Branch: REL_13_STABLE [78bf0a256] 2023-06-12 09:14:17 +0900
Branch: REL_12_STABLE [edf1de65e] 2023-06-12 09:14:19 +0900
Branch: REL_11_STABLE [bbfc26d86] 2023-06-12 09:14:20 +0900
-->
     <para>
      Tighten whitespace checks in <filename>contrib/hstore</filename>
      input (Evan Jones)
     </para>

     <para>
      In some cases, characters would be falsely recognized as whitespace
      and hence discarded.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_16_BR [c00fbe89d] 2023-06-15 13:45:34 +0900
Branch: REL_15_STABLE [4be308ede] 2023-06-15 13:45:38 +0900
Branch: REL_14_STABLE [019a40d61] 2023-06-15 13:45:40 +0900
Branch: REL_13_STABLE [ae9aac64a] 2023-06-15 13:45:41 +0900
Branch: REL_12_STABLE [6ecc1c02a] 2023-06-15 13:45:42 +0900
Branch: REL_11_STABLE [ab40b0395] 2023-06-15 13:45:44 +0900
-->
     <para>
      Disallow oversize input arrays
      with <filename>contrib/intarray</filename>'s
      <literal>gist__int_ops</literal> index opclass (Ankit Kumar Pandey,
      Alexander Lakhin)
     </para>

     <para>
      Previously this code would report a <literal>NOTICE</literal> but
      press on anyway, creating an invalid index entry that presents a
      risk of crashes when the index is read.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8aac9759b] 2023-07-13 13:07:51 -0400
Branch: REL_16_STABLE [e27f3f52c] 2023-07-13 13:08:08 -0400
Branch: REL_15_STABLE [5cb461989] 2023-07-13 13:08:17 -0400
Branch: REL_14_STABLE [a6991f763] 2023-07-13 13:08:23 -0400
Branch: REL_13_STABLE [7fffcc2ee] 2023-07-13 13:08:28 -0400
Branch: REL_12_STABLE [8d8f37149] 2023-07-13 13:08:33 -0400
Branch: REL_11_STABLE [9f70f6d4c] 2023-07-13 13:08:40 -0400
-->
     <para>
      Avoid useless double decompression of GiST index entries
      in <filename>contrib/intarray</filename> (Konstantin Knizhnik,
      Matthias van de Meent, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [a5ea825f9] 2023-07-14 11:15:34 +0900
Branch: REL_16_STABLE [27da47122] 2023-07-14 11:16:03 +0900
Branch: REL_15_STABLE [eb3abec4b] 2023-07-14 11:16:06 +0900
Branch: REL_14_STABLE [7af65523a] 2023-07-14 11:16:08 +0900
Branch: REL_13_STABLE [bdaaf1bf1] 2023-07-14 11:16:10 +0900
Branch: REL_12_STABLE [7d27493b7] 2023-07-14 11:16:11 +0900
Branch: REL_11_STABLE [db9813819] 2023-07-14 11:16:13 +0900
-->
     <para>
      Ensure
      that <structname>pg_index</structname>.<structfield>indisreplident</structfield>
      is kept up-to-date in relation cache entries (Shruthi Gowda)
     </para>

     <para>
      This value could be stale in some cases.  There is no core code that
      relies on the relation cache's copy, so this is only a latent bug as
      far as Postgres itself is concerned; but there may be extensions for
      which it is a live bug.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: REL_13_STABLE [8aa9a2623] 2023-06-24 20:22:57 +0900
Branch: REL_12_STABLE [265c9138d] 2023-06-24 20:26:56 +0900
Branch: REL_11_STABLE [96f96398d] 2023-06-24 20:29:42 +0900
-->
     <para>
      Silence deprecation warnings when compiling with OpenSSL 3.0.0 or
      later (Peter Eisentraut)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-15">
  <title>Release 12.15</title>

  <formalpara>
  <title>Release date:</title>
  <para>2023-05-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.14.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.15</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.10,
    see <xref linkend="release-12-10"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [681d9e462] 2023-05-08 06:14:07 -0700
Branch: REL_15_STABLE [dbd5795e7] 2023-05-08 06:14:11 -0700
Branch: REL_14_STABLE [01e8182c7] 2023-05-08 06:14:11 -0700
Branch: REL_13_STABLE [2212f7db8] 2023-05-08 06:14:12 -0700
Branch: REL_12_STABLE [78119a0bf] 2023-05-08 06:14:12 -0700
Branch: REL_11_STABLE [23cb8eaeb] 2023-05-08 06:14:12 -0700
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8d525d7b9] 2023-05-08 11:24:47 -0400
Branch: REL_15_STABLE [1b761d896] 2023-05-08 11:24:47 -0400
Branch: REL_14_STABLE [1913f63dc] 2023-05-08 11:24:47 -0400
Branch: REL_13_STABLE [feb9e7fbb] 2023-05-08 11:24:47 -0400
Branch: REL_12_STABLE [2cd843cc9] 2023-05-08 11:24:47 -0400
Branch: REL_11_STABLE [766e06140] 2023-05-08 11:24:47 -0400
-->
     <para>
      Prevent <command>CREATE SCHEMA</command> from defeating changes
      in <varname>search_path</varname> (Alexander Lakhin)
     </para>

     <para>
      Within a <command>CREATE SCHEMA</command> command, objects in the
      prevailing <varname>search_path</varname>, as well as those in the
      newly-created schema, would be visible even within a called
      function or script that attempted to set a
      secure <varname>search_path</varname>.  This could allow any user
      having permission to create a schema to hijack the privileges of a
      security definer function or extension script.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Alexander Lakhin for reporting this problem.
      (CVE-2023-2454)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ca73753b0] 2023-05-08 10:12:44 -0400
Branch: REL_15_STABLE [04e560604] 2023-05-08 10:12:44 -0400
Branch: REL_14_STABLE [f8d799eda] 2023-05-08 10:12:44 -0400
Branch: REL_13_STABLE [b8e28f04f] 2023-05-08 10:12:44 -0400
Branch: REL_12_STABLE [ee87b482c] 2023-05-08 10:12:45 -0400
Branch: REL_11_STABLE [473626cf0] 2023-05-08 10:12:45 -0400
-->
     <para>
      Enforce row-level security policies correctly after inlining a
      set-returning function (Stephen Frost, Tom Lane)
     </para>

     <para>
      If a set-returning SQL-language function refers to a table having
      row-level security policies, and it can be inlined into a calling
      query, those RLS policies would not get enforced properly in some
      cases involving re-using a cached plan under a different role.
      This could allow a user to see or modify rows that should have been
      invisible.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Wolfgang Walther for reporting this problem.
      (CVE-2023-2455)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [4dadd660f] 2023-04-28 19:29:12 +0900
Branch: REL_15_STABLE [b9ad73ad2] 2023-04-28 19:29:36 +0900
Branch: REL_14_STABLE [d29eba198] 2023-04-28 19:29:38 +0900
Branch: REL_13_STABLE [7e95a33b4] 2023-04-28 19:29:40 +0900
Branch: REL_12_STABLE [63f7e91ec] 2023-04-28 19:29:42 +0900
Branch: REL_11_STABLE [a9212716b] 2023-04-28 19:29:44 +0900
-->
     <para>
      Avoid crash when the new schema name is omitted
      in <command>CREATE SCHEMA</command> (Michael Paquier)
     </para>

     <para>
      The SQL standard allows writing <literal>CREATE SCHEMA AUTHORIZATION
      <replaceable>owner_name</replaceable></literal>, with the schema
      name defaulting to <replaceable>owner_name</replaceable>.  However
      some code paths expected the schema name to be present and would
      fail.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a3c9d35ae] 2023-03-27 15:04:15 -0400
Branch: REL_15_STABLE [d90d59e25] 2023-03-27 15:04:02 -0400
Branch: REL_14_STABLE [334cc4c96] 2023-03-27 15:04:02 -0400
Branch: REL_13_STABLE [29a20ff06] 2023-03-27 15:04:02 -0400
Branch: REL_12_STABLE [cd07163c0] 2023-03-27 15:04:02 -0400
Branch: REL_11_STABLE [78838bc3d] 2023-03-27 15:04:02 -0400
-->
     <para>
      Disallow altering composite types that are stored in indexes
      (Tom Lane)
     </para>

     <para>
      <command>ALTER TYPE</command> disallows non-binary-compatible
      modifications of composite types if they are stored in any table
      columns.  (Perhaps that will be allowed someday, but it hasn't
      happened yet; the locking implications of rewriting many tables are
      daunting.)  We overlooked the possibility that an index might
      contain a composite type that doesn't also appear in its table.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f0d65c0ea] 2023-03-31 11:18:49 -0400
Branch: REL_15_STABLE [6e3698173] 2023-03-31 11:18:49 -0400
Branch: REL_14_STABLE [b0b55d8b8] 2023-03-31 11:18:49 -0400
Branch: REL_13_STABLE [bfb993b1b] 2023-03-31 11:18:49 -0400
Branch: REL_12_STABLE [e8d74aac5] 2023-03-31 11:18:49 -0400
-->
     <para>
      Disallow system columns as elements of foreign keys (Tom Lane)
     </para>

     <para>
      Since the removal of OID as a system column, there is no plausible
      use-case for this, and various bits of code no longer support it.
      Disallow it rather than trying to fix all the cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d66bb048c] 2023-03-10 13:52:44 -0500
Branch: REL_15_STABLE [59947bac7] 2023-03-10 13:52:28 -0500
Branch: REL_14_STABLE [53a53ea33] 2023-03-10 13:52:28 -0500
Branch: REL_13_STABLE [866fd004d] 2023-03-10 13:52:28 -0500
Branch: REL_12_STABLE [a30310833] 2023-03-10 13:52:28 -0500
Branch: REL_11_STABLE [6e2674d77] 2023-03-10 13:52:28 -0500
-->
     <para>
      Ensure that <command>COPY TO</command> from an RLS-enabled parent
      table does not copy any rows from child tables (Antonin Houska)
     </para>

     <para>
      The documentation is quite clear that <command>COPY TO</command>
      copies rows from only the named table, not any inheritance children
      it may have.  However, if row-level security was enabled on the table
      then this stopped being true.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4c40995f6] 2023-05-04 11:48:23 -0400
Branch: REL_15_STABLE [ccb479e76] 2023-05-04 11:48:23 -0400
Branch: REL_14_STABLE [d5de344a5] 2023-05-04 11:48:23 -0400
Branch: REL_13_STABLE [9a72f499a] 2023-05-04 11:48:23 -0400
Branch: REL_12_STABLE [580df5078] 2023-05-04 11:48:23 -0400
Branch: REL_11_STABLE [4624aad61] 2023-05-04 11:48:23 -0400
-->
     <para>
      Avoid possible crash when <function>array_position()</function>
      or <function>array_positions()</function> is passed an empty array
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b081fe419] 2023-03-14 19:17:31 -0400
Branch: REL_15_STABLE [a67c75f82] 2023-03-14 19:17:31 -0400
Branch: REL_14_STABLE [7cac19105] 2023-03-14 19:17:31 -0400
Branch: REL_13_STABLE [386a26023] 2023-03-14 19:17:31 -0400
Branch: REL_12_STABLE [6d3a9a60f] 2023-03-14 19:17:31 -0400
Branch: REL_11_STABLE [8e33fb9ef] 2023-03-14 19:17:31 -0400
-->
     <para>
      Fix possible out-of-bounds fetch in <function>to_char()</function>
      (Tom Lane)
     </para>

     <para>
      With bad luck this could have resulted in a server crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d7056bc1c] 2023-03-01 11:30:31 -0500
Branch: REL_15_STABLE [eae09137d] 2023-03-01 11:30:17 -0500
Branch: REL_14_STABLE [1a9356f65] 2023-03-01 11:30:17 -0500
Branch: REL_13_STABLE [3b37e8442] 2023-03-01 11:30:17 -0500
Branch: REL_12_STABLE [b162660d3] 2023-03-01 11:30:17 -0500
Branch: REL_11_STABLE [b1a9d8ef2] 2023-03-01 11:30:17 -0500
-->
     <para>
      Avoid buffer overread in <function>translate()</function> function
      (Daniil Anisimov)
     </para>

     <para>
      When using the deletion feature, the function might fetch the byte
      just after the input string, creating a small risk of crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [25a7812cd] 2023-03-13 15:19:00 -0400
Branch: REL_15_STABLE [74a1a36d7] 2023-03-13 15:19:00 -0400
Branch: REL_14_STABLE [0ee9d685d] 2023-03-13 15:19:00 -0400
Branch: REL_13_STABLE [52e9a7816] 2023-03-13 15:19:00 -0400
Branch: REL_12_STABLE [c25a929a6] 2023-03-13 15:19:00 -0400
Branch: REL_11_STABLE [234941a3b] 2023-03-13 15:19:00 -0400
-->
     <para>
      Fix error cursor setting for parse errors in JSON string literals
      (Tom Lane)
     </para>

     <para>
      Most cases in which a syntax error is detected in a string literal
      within a JSON value failed to set the error cursor appropriately.
      This led at least to an unhelpful error message (pointing to the
      token before the string, rather than the actual trouble spot), and
      could even result in a crash in v14 and later.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [be504a3e9] 2023-03-07 21:52:32 -0800
Branch: REL_15_STABLE [391f08fd6] 2023-03-07 21:36:48 -0800
Branch: REL_14_STABLE [324281fd5] 2023-03-07 21:36:49 -0800
Branch: REL_13_STABLE [e6d77f22c] 2023-03-07 21:36:51 -0800
Branch: REL_12_STABLE [3c92f7e9d] 2023-03-07 21:36:52 -0800
-->
     <para>
      Fix data corruption due to <varname>vacuum_defer_cleanup_age</varname>
      being larger than the current 64-bit xid (Andres Freund)
     </para>

     <para>
      In v14 and later with non-default settings
      of <varname>vacuum_defer_cleanup_age</varname>, it was possible to
      compute a very large vacuum cleanup horizon xid, leading to vacuum
      removing rows that are still live.  v12 and v13 have a lesser form
      of the same problem affecting only GiST indexes, which could lead to
      index pages getting recycled too early.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [30dbdbe75] 2023-03-13 12:40:28 -0400
Branch: REL_15_STABLE [5fd61bdc1] 2023-03-13 12:40:28 -0400
Branch: REL_14_STABLE [096e70805] 2023-03-13 12:40:28 -0400
Branch: REL_13_STABLE [bc0bcce2e] 2023-03-13 12:40:28 -0400
Branch: REL_12_STABLE [62a91a1b0] 2023-03-13 12:40:28 -0400
Branch: REL_11_STABLE [0736b1131] 2023-03-13 12:40:28 -0400
-->
     <para>
      Fix parser's failure to detect some cases of improperly-nested
      aggregates (Tom Lane)
     </para>

     <para>
      This oversight could lead to executor failures for queries that
      should have been rejected as invalid.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [6c3b697b1] 2023-03-31 12:13:05 +1300
Branch: REL_15_STABLE [df567fbf6] 2023-03-31 12:13:34 +1300
Branch: REL_14_STABLE [211016220] 2023-03-31 12:14:04 +1300
Branch: REL_13_STABLE [8d684c445] 2023-03-31 12:14:31 +1300
Branch: REL_12_STABLE [33510bc64] 2023-03-31 12:15:07 +1300
Branch: REL_11_STABLE [07554c99d] 2023-03-31 12:15:39 +1300
-->
     <para>
      Fix data structure corruption during parsing of
      serial <literal>SEQUENCE NAME</literal> options (David Rowley)
     </para>

     <para>
      This can lead to trouble if an event trigger captures the corrupted
      parse tree.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [88ceac5d7] 2023-04-12 10:46:38 -0400
Branch: REL_15_STABLE [f4badbcf4] 2023-04-12 10:46:30 -0400
Branch: REL_14_STABLE [0dd55ef9b] 2023-04-12 10:46:30 -0400
Branch: REL_13_STABLE [96c698e3f] 2023-04-12 10:46:30 -0400
Branch: REL_12_STABLE [953ff99c2] 2023-04-12 10:46:30 -0400
Branch: REL_11_STABLE [60c8aeaf6] 2023-04-12 10:46:30 -0400
-->
     <para>
      Correctly update plan nodes' parallel-safety markings when moving
      initplans from one node to another (Tom Lane)
     </para>

     <para>
      This planner oversight could lead to <quote>subplan was not
      initialized</quote> errors at runtime.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [836c31ba5] 2023-02-13 17:11:03 +1300
Branch: REL_15_STABLE [a9fa6d79a] 2023-02-13 17:10:31 +1300
Branch: REL_14_STABLE [4aa43ba21] 2023-02-13 17:09:55 +1300
Branch: REL_13_STABLE [301eb3ee4] 2023-02-13 17:09:26 +1300
Branch: REL_12_STABLE [ac55abd33] 2023-02-13 17:08:46 +1300
Branch: REL_11_STABLE [8d2a8581b] 2023-02-13 17:07:04 +1300
-->
     <para>
      Disable the inverse-transition optimization for window aggregates
      when the call contains sub-SELECTs (David Rowley)
     </para>

     <para>
      This optimization requires that the aggregate's argument expressions
      have repeatable results, which might not hold for a sub-SELECT.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [554841699] 2023-03-26 13:41:06 -0400
Branch: REL_15_STABLE [7c4873438] 2023-03-26 13:41:06 -0400
Branch: REL_14_STABLE [11213d446] 2023-03-26 13:41:06 -0400
Branch: REL_13_STABLE [1bbbe1460] 2023-03-26 13:41:06 -0400
Branch: REL_12_STABLE [ad5fe7420] 2023-03-26 13:41:06 -0400
Branch: REL_11_STABLE [ae320fc21] 2023-03-26 13:41:06 -0400
-->
     <para>
      Fix oversights in execution of nested <literal>ARRAY[]</literal>
      constructs (Alexander Lakhin, Tom Lane)
     </para>

     <para>
      Correctly detect overflow of the total space needed for the result
      array, avoiding a possible crash due to undersized output
      allocation.  Also ensure that any trailing padding space in the
      result array is zeroed; while leaving garbage there is harmless for
      most purposes, it can result in odd behavior later.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [064eb89e8] 2023-04-15 12:01:39 -0400
Branch: REL_15_STABLE [c53ed26ea] 2023-04-15 12:01:39 -0400
Branch: REL_14_STABLE [9b104a27c] 2023-04-15 12:01:39 -0400
Branch: REL_13_STABLE [7428aecdd] 2023-04-15 12:01:39 -0400
Branch: REL_12_STABLE [048caf8d7] 2023-04-15 12:01:39 -0400
-->
     <para>
      Prevent crash when updating a field within an
      array-of-domain-over-composite-type column (Dmitry Dolgov)
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [e0693faf7] 2023-04-14 16:20:27 +1200
Branch: REL_15_STABLE [0c09160e1] 2023-04-14 16:21:07 +1200
Branch: REL_14_STABLE [ae85fb828] 2023-04-14 16:21:42 +1200
Branch: REL_13_STABLE [6848f0c67] 2023-04-14 16:22:11 +1200
Branch: REL_12_STABLE [0b2e77ce2] 2023-04-14 16:22:46 +1200
Branch: REL_11_STABLE [1c19e2863] 2023-04-14 16:23:11 +1200
-->
     <para>
      Fix partition pruning logic for partitioning on boolean columns
      (David Rowley)
     </para>

     <para>
      Pruning with a condition like <literal>boolcol IS NOT TRUE</literal>
      was done incorrectly, leading to possibly not returning rows in
      which <literal>boolcol</literal> is NULL.  Also, the rather unlikely
      case of partitioning on <literal>NOT boolcol</literal> was handled
      incorrectly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [8d578b9b2] 2023-03-21 14:29:34 +1300
Branch: REL_15_STABLE [c03c6e8cf] 2023-03-21 14:32:14 +1300
Branch: REL_14_STABLE [1b9e42e82] 2023-03-21 14:37:33 +1300
Branch: REL_13_STABLE [6e94d62e3] 2023-03-21 14:38:59 +1300
Branch: REL_12_STABLE [44d44aa97] 2023-03-21 14:41:35 +1300
Branch: REL_11_STABLE [ef16d2724] 2023-03-21 14:43:07 +1300
-->
     <para>
      Fix race condition in per-batch cleanup during parallel hash join
      (Thomas Munro, Melanie Plageman)
     </para>

     <para>
      A crash was possible given unlucky timing and
      <varname>parallel_leader_participation</varname>
      = <literal>off</literal> (which is not the default).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7fee7871b] 2023-03-06 18:31:27 -0500
Branch: REL_15_STABLE [70ef50954] 2023-03-06 18:31:16 -0500
Branch: REL_14_STABLE [1e05ea51d] 2023-03-06 18:31:16 -0500
Branch: REL_13_STABLE [4a94cbd02] 2023-03-06 18:31:16 -0500
Branch: REL_12_STABLE [23b75dd03] 2023-03-06 18:31:16 -0500
-->
     <para>
      Recalculate <literal>GENERATED</literal> columns after an
      EvalPlanQual check (Tom Lane)
     </para>

     <para>
      In <literal>READ COMMITTED</literal> isolation mode, the effects of
      a row update might need to get reapplied to a newer version of the
      row than the query found originally.  If so, we need to recompute
      any <literal>GENERATED</literal> columns, in case they depend on
      columns that were changed by the concurrent update.
     </para>
    </listitem>

    <listitem>
<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [bfac8f8bc] 2023-04-25 13:54:10 +0200
Branch: REL_15_STABLE [0319b306e] 2023-04-25 13:54:10 +0200
Branch: REL_14_STABLE [0e8e5e856] 2023-04-25 13:54:10 +0200
Branch: REL_13_STABLE [b95f36f86] 2023-04-25 13:54:10 +0200
Branch: REL_12_STABLE [cba3c8f6d] 2023-04-25 13:54:10 +0200
Branch: REL_11_STABLE [0151d2c5f] 2023-04-25 13:54:10 +0200
-->
     <para>
      Don't balance vacuum cost delay when a table has a
      per-relation <varname>vacuum_cost_delay</varname> setting of zero
      (Masahiko Sawada)
     </para>

     <para>
      Delay balancing is supposed to be disabled whenever autovacuum is
      processing a table with a
      per-relation <varname>vacuum_cost_delay</varname> setting, but this
      was done only for positive settings, not zero.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [99be6feec] 2023-03-07 18:21:53 -0500
Branch: REL_15_STABLE [76d2177fb] 2023-03-07 18:21:53 -0500
Branch: REL_14_STABLE [9f1e51b59] 2023-03-07 18:21:37 -0500
Branch: REL_13_STABLE [695b34ab3] 2023-03-07 18:21:37 -0500
Branch: REL_12_STABLE [5a19da58e] 2023-03-07 18:21:37 -0500
Branch: REL_11_STABLE [721626cb5] 2023-03-07 18:21:37 -0500
-->
     <para>
      Fix corner-case crashes when columns have been added to the end of a
      view (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [87f3667ec] 2023-02-25 14:44:14 -0500
Branch: REL_15_STABLE [a033f9165] 2023-02-25 14:44:14 -0500
Branch: REL_14_STABLE [9eaba0602] 2023-02-25 14:44:14 -0500
Branch: REL_13_STABLE [1e199c259] 2023-02-25 14:44:14 -0500
Branch: REL_12_STABLE [904b171a4] 2023-02-25 14:44:14 -0500
Branch: REL_11_STABLE [ffec64ba8] 2023-02-25 14:44:14 -0500
-->
     <para>
      Repair rare failure of MULTIEXPR_SUBLINK subplans in partitioned
      updates (Andres Freund, Tom Lane)
     </para>

     <para>
      Use of the syntax <literal>INSERT ... ON CONFLICT DO UPDATE SET (c1,
      ...) = (SELECT ...)</literal> with a partitioned target table could
      result in failure if any child table is dissimilar from the parent
      (for example, different physical column order).
      This typically manifested as failure of consistency checks in the
      executor; but a crash or incorrect data updates are also possible.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [75c737636] 2023-02-23 10:53:01 +0000
Branch: REL_15_STABLE [940b54743] 2023-02-23 10:54:51 +0000
Branch: REL_14_STABLE [f0423bea7] 2023-02-23 10:55:48 +0000
Branch: REL_13_STABLE [226da3d47] 2023-02-23 10:56:41 +0000
Branch: REL_12_STABLE [98b83b734] 2023-02-23 10:57:46 +0000
Branch: REL_11_STABLE [e68b133c3] 2023-02-23 10:58:43 +0000
-->
     <para>
      Fix handling of <literal>DEFAULT</literal> markers within a
      multi-row <literal>INSERT ... VALUES</literal> query on a view that
      has a <literal>DO ALSO INSERT ... SELECT</literal> rule (Dean
      Rasheed)
     </para>

     <para>
      Such cases typically failed with <quote>unrecognized node
      type</quote> errors or assertion failures.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [a7d71c41d] 2023-02-25 14:41:12 +0000
Branch: REL_15_STABLE [8e5b4e001] 2023-02-25 14:43:57 +0000
Branch: REL_14_STABLE [27ff93d18] 2023-02-25 14:44:49 +0000
Branch: REL_13_STABLE [39ad791e8] 2023-02-25 14:45:44 +0000
Branch: REL_12_STABLE [4fd093af7] 2023-02-25 14:47:03 +0000
Branch: REL_11_STABLE [79f194cc0] 2023-02-25 14:48:08 +0000
-->
     <para>
      Support references to <literal>OLD</literal>
      and <literal>NEW</literal> within subqueries in rule actions
      (Dean Rasheed, Tom Lane)
     </para>

     <para>
      Such references are really lateral references, but the server could
      crash if the subquery wasn't explicitly marked
      with <literal>LATERAL</literal>.  Arrange to do that implicitly when
      necessary.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [393430f57] 2023-02-17 16:40:34 -0500
Branch: REL_15_STABLE [c8a5f1685] 2023-02-17 16:40:34 -0500
Branch: REL_14_STABLE [14345f3c6] 2023-02-17 16:40:34 -0500
Branch: REL_13_STABLE [4efb4f0d4] 2023-02-17 16:40:34 -0500
Branch: REL_12_STABLE [3dd287c14] 2023-02-17 16:40:34 -0500
Branch: REL_11_STABLE [df931e9ab] 2023-02-17 16:40:34 -0500
-->
     <para>
      When decompiling a rule or SQL function body
      containing <command>INSERT</command>/<command>UPDATE</command>/<command>DELETE</command>
      within <command>WITH</command>, take care to print the correct alias
      for the target table (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [47c0accbe] 2023-03-06 15:07:15 +1300
Branch: REL_15_STABLE [055990904] 2023-03-06 16:05:47 +1300
Branch: REL_14_STABLE [e9051ecd5] 2023-03-06 16:17:22 +1300
Branch: REL_13_STABLE [a0f55fc86] 2023-03-06 16:28:34 +1300
Branch: REL_12_STABLE [afa122e41] 2023-03-06 16:41:34 +1300
Branch: master [65e388d41] 2023-03-09 16:33:24 +1300
Branch: REL_15_STABLE [af397c6c2] 2023-03-09 16:56:51 +1300
Branch: REL_14_STABLE [d811d74be] 2023-03-09 16:57:11 +1300
Branch: REL_13_STABLE [ae632f7a3] 2023-03-09 17:09:57 +1300
Branch: REL_12_STABLE [e30fd0942] 2023-03-09 17:25:20 +1300
Branch: REL_11_STABLE [d1c0f81e7] 2023-03-09 17:26:06 +1300
-->
     <para>
      Fix glitches in <literal>SERIALIZABLE READ ONLY</literal>
      optimization (Thomas Munro)
     </para>

     <para>
      Transactions already marked as <quote>doomed</quote> confused the
      safe-snapshot optimization for <literal>SERIALIZABLE READ
      ONLY</literal> transactions.  The optimization was unnecessarily
      skipped in some cases.  In other cases an assertion failure occurred
      (but there was no problem in non-assert builds).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [05172f1f3] 2023-02-23 15:40:42 -0500
Branch: REL_15_STABLE [cef1c9c0c] 2023-02-23 15:40:28 -0500
Branch: REL_14_STABLE [0f78df719] 2023-02-23 15:40:28 -0500
Branch: REL_13_STABLE [861e9e486] 2023-02-23 15:40:28 -0500
Branch: REL_12_STABLE [95558bc8f] 2023-02-23 15:40:28 -0500
Branch: REL_11_STABLE [44dbc960f] 2023-02-23 15:40:28 -0500
-->
     <para>
      Avoid leaking cache callback slots in
      the <literal>pgoutput</literal> logical decoding plugin (Shi Yu)
     </para>

     <para>
      Multiple cycles of starting up and shutting down the plugin within a
      single session would eventually lead to an <quote>out of
      relcache_callback_list slots</quote> error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8e5eef50c] 2023-03-29 11:31:30 -0400
Branch: REL_15_STABLE [2dc77adc7] 2023-03-29 11:31:30 -0400
Branch: REL_14_STABLE [a1904c9ce] 2023-03-29 11:31:30 -0400
Branch: REL_13_STABLE [2adb6adad] 2023-03-29 11:31:30 -0400
Branch: REL_12_STABLE [d2a1d4b19] 2023-03-29 11:31:30 -0400
Branch: REL_11_STABLE [b5c6776c1] 2023-03-29 11:31:30 -0400
-->
     <para>
      Fix dereference of dangling pointer during buffering build of a GiST
      index (Alexander Lakhin)
     </para>

     <para>
      This error seems to usually be harmless in production builds, as the
      fetched value is noncritical; but in principle it could cause a
      server crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [adedf54e6] 2023-03-23 11:58:36 +0530
Branch: REL_15_STABLE [b6bf90edc] 2023-03-23 11:46:16 +0530
Branch: REL_14_STABLE [9dac02c77] 2023-03-23 11:32:22 +0530
Branch: REL_13_STABLE [be52fff91] 2023-03-23 11:21:13 +0530
Branch: REL_12_STABLE [0f2d4adbf] 2023-03-23 11:08:38 +0530
Branch: master [b797def59] 2023-03-21 09:47:21 +0530
Branch: REL_15_STABLE [3c12407f4] 2023-03-21 09:40:41 +0530
Branch: REL_14_STABLE [65ead7696] 2023-03-21 09:18:51 +0530
Branch: REL_13_STABLE [751d6676d] 2023-03-21 09:07:37 +0530
Branch: REL_12_STABLE [fc63e6ba8] 2023-03-21 08:50:23 +0530
Branch: REL_11_STABLE [4cdaea7a2] 2023-03-21 08:39:00 +0530
-->
     <para>
      Ignore dropped columns and generated columns during logical
      replication of an update or delete action (Onder Kalaci, Shi Yu)
     </para>

     <para>
      Replication with the <literal>REPLICA IDENTITY FULL</literal> option
      failed if the table contained such columns.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [9244c11af] 2023-02-15 10:12:16 +0900
Branch: REL_15_STABLE [5fd61055e] 2023-02-15 10:12:31 +0900
Branch: REL_14_STABLE [864f80fea] 2023-02-15 10:12:33 +0900
Branch: REL_13_STABLE [2eb8e54cc] 2023-02-15 10:12:36 +0900
Branch: REL_12_STABLE [a40e7b75e] 2023-02-15 10:12:38 +0900
Branch: REL_11_STABLE [88d606f7c] 2023-02-15 10:12:40 +0900
-->
     <para>
      Support RSA-PSS certificates with SCRAM-SHA-256 channel binding
      (Jacob Champion, Heikki Linnakangas)
     </para>

     <para>
      This feature requires building with OpenSSL 1.1.1 or newer.  Both
      the server and <application>libpq</application> are affected.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [d41a178b3] 2023-03-15 13:24:47 +1300
Branch: REL_15_STABLE [06066915d] 2023-03-15 13:25:56 +1300
Branch: REL_14_STABLE [9b6e0b9c3] 2023-03-15 13:30:58 +1300
Branch: REL_13_STABLE [9f1c64018] 2023-03-15 13:31:34 +1300
Branch: REL_12_STABLE [836288427] 2023-03-15 13:32:21 +1300
Branch: REL_11_STABLE [5ff8e69d8] 2023-03-15 13:32:41 +1300
Branch: master [6a9229da6] 2023-03-17 10:44:46 +1300
Branch: REL_15_STABLE [75e7378f6] 2023-03-17 10:45:20 +1300
Branch: REL_14_STABLE [00fc4b3a3] 2023-03-17 09:52:45 +1300
Branch: REL_13_STABLE [798dae9f6] 2023-03-17 09:54:03 +1300
Branch: REL_12_STABLE [6f508b8bc] 2023-03-17 09:54:51 +1300
Branch: REL_11_STABLE [9d6c34397] 2023-03-17 09:58:08 +1300
Branch: master [10b6745d3] 2023-03-17 14:44:12 +1300
Branch: REL_15_STABLE [e8a774d00] 2023-03-17 14:46:03 +1300
Branch: REL_14_STABLE [1c0d4affa] 2023-03-17 14:46:50 +1300
Branch: REL_13_STABLE [77a8133c9] 2023-03-17 14:47:16 +1300
Branch: REL_12_STABLE [8fcd1517f] 2023-03-17 14:47:38 +1300
Branch: REL_11_STABLE [b23f2a729] 2023-03-17 14:48:08 +1300
-->
     <para>
      Avoid race condition with process ID tracking on Windows (Thomas Munro)
     </para>

     <para>
      The operating system could recycle a PID before the postmaster
      observed that that child process was gone.  This could lead to
      tracking more than one child with the same PID, resulting in
      confusion.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [d0460a31d] 2023-02-22 13:23:09 +0000
Branch: REL_15_STABLE [576b25bfd] 2023-02-22 13:24:51 +0000
Branch: REL_14_STABLE [482ab3e4f] 2023-02-22 13:26:20 +0000
Branch: REL_13_STABLE [906356cf6] 2023-02-22 13:27:29 +0000
Branch: REL_12_STABLE [52dbd9f84] 2023-02-22 13:28:30 +0000
Branch: REL_11_STABLE [83a54d966] 2023-02-22 13:29:39 +0000
-->
     <para>
      Add missing cases to <function>SPI_result_code_string()</function>
      (Dean Rasheed)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b3e184a5d] 2023-02-21 18:48:15 -0500
Branch: REL_15_STABLE [f6a55c1d5] 2023-02-21 18:47:46 -0500
Branch: REL_14_STABLE [dc44180f6] 2023-02-21 18:47:47 -0500
Branch: REL_13_STABLE [99e74cd23] 2023-02-21 18:47:47 -0500
Branch: REL_12_STABLE [463bef383] 2023-02-21 18:47:47 -0500
Branch: REL_11_STABLE [21bd818d0] 2023-02-21 18:47:47 -0500
-->
     <para>
      Fix erroneous Valgrind markings
      in <function>AllocSetRealloc()</function> (Karina Litskevich)
     </para>

     <para>
      In the unusual case where the size of a large (&gt;8kB) palloc chunk
      is decreased, a Valgrind-aware build would mismark the defined-ness
      state of the memory released from the chunk, possibly causing
      incorrect results during Valgrind testing.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [7fe1aa991] 2023-02-22 15:24:18 +0100
Branch: REL_15_STABLE [949ac32e1] 2023-02-22 16:48:30 +0100
Branch: REL_14_STABLE [8b9cbd42b] 2023-02-22 16:25:45 +0100
Branch: REL_13_STABLE [4df581fa0] 2023-02-22 16:09:30 +0100
Branch: REL_12_STABLE [497f863f0] 2023-02-22 15:50:37 +0100
Branch: REL_11_STABLE [8de91ebf2] 2023-02-22 15:35:19 +0100
-->
     <para>
      Avoid assertion failure when decoding a transactional logical
      replication message (Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [c04c6c5d6] 2023-04-21 08:19:41 -0700
Branch: REL_15_STABLE [109363de0] 2023-04-21 08:20:17 -0700
Branch: REL_14_STABLE [dde926b0f] 2023-04-21 08:20:32 -0700
Branch: REL_13_STABLE [79a66c617] 2023-04-21 08:20:47 -0700
Branch: REL_12_STABLE [5bcb15b81] 2023-04-21 08:21:04 -0700
Branch: REL_11_STABLE [106a1bf82] 2023-04-21 08:21:18 -0700
-->
     <para>
      Avoid locale sensitivity when processing regular expression escapes
      (Jeff Davis)
     </para>

     <para>
      A backslash followed by a non-ASCII character could sometimes cause
      an assertion failure, depending on the prevailing locale.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3e383f9b6] 2023-04-17 14:22:26 -0400
Branch: REL_15_STABLE [2207df7c3] 2023-04-17 14:22:06 -0400
Branch: REL_14_STABLE [72a914e9f] 2023-04-17 14:22:06 -0400
Branch: REL_13_STABLE [86874a6df] 2023-04-17 14:22:06 -0400
Branch: REL_12_STABLE [9b0c1f213] 2023-04-17 14:22:06 -0400
Branch: REL_11_STABLE [c796d7296] 2023-04-17 14:22:06 -0400
-->
     <para>
      Avoid trying to write an empty WAL record
      in <function>log_newpage_range()</function> when the last few pages
      in the specified range are empty (Matthias van de Meent)
     </para>

     <para>
      It is not entirely clear whether this case is reachable in released
      branches, but if it is then an assertion failure could occur.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [441ee1677] 2023-04-24 14:19:46 -0400
Branch: REL_15_STABLE [c1598d85f] 2023-04-24 14:19:46 -0400
Branch: REL_14_STABLE [2ba890ce7] 2023-04-24 14:19:46 -0400
Branch: REL_13_STABLE [bfa691087] 2023-04-24 14:19:46 -0400
Branch: REL_12_STABLE [ee71cad9a] 2023-04-24 14:19:46 -0400
-->
     <para>
      Fix session-lifespan memory leakage in <application>plpgsql</application>
      <literal>DO</literal> blocks that use cast expressions
      (Ajit Awekar, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f47004add] 2023-04-29 13:06:44 -0400
Branch: REL_15_STABLE [ce9a1a3ea] 2023-04-29 13:06:44 -0400
Branch: REL_14_STABLE [1e868bb6c] 2023-04-29 13:06:44 -0400
Branch: REL_13_STABLE [ee24b5e79] 2023-04-29 13:06:44 -0400
Branch: REL_12_STABLE [900a8d526] 2023-04-29 13:06:44 -0400
Branch: REL_11_STABLE [ea96fbe77] 2023-04-29 13:06:44 -0400
-->
     <para>
      Tighten array dimensionality checks when converting Perl
      list structures to multi-dimensional SQL arrays (Tom Lane)
     </para>

     <para>
      <application>plperl</application> could misbehave when the nesting
      of sub-lists is inconsistent so that the data does not represent a
      rectangular array of values.  Such cases now produce errors, but
      previously they could result in a crash or garbage output.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0553528e7] 2023-05-04 11:00:33 -0400
Branch: REL_15_STABLE [b7001c6b6] 2023-05-04 11:00:33 -0400
Branch: REL_14_STABLE [9d517339e] 2023-05-04 11:00:33 -0400
Branch: REL_13_STABLE [0e6354ed9] 2023-05-04 11:00:33 -0400
Branch: REL_12_STABLE [b7fcf3824] 2023-05-04 11:00:33 -0400
Branch: REL_11_STABLE [aa7e5e404] 2023-05-04 11:00:33 -0400
Branch: master [81eaaf65e] 2023-04-28 12:24:29 -0400
Branch: REL_15_STABLE [512c55522] 2023-04-28 12:24:29 -0400
Branch: REL_14_STABLE [a1d9aacc4] 2023-04-28 12:24:29 -0400
Branch: REL_13_STABLE [7dcd9998c] 2023-04-28 12:24:29 -0400
Branch: REL_12_STABLE [ff9203f46] 2023-04-28 12:24:29 -0400
Branch: REL_11_STABLE [b7c6af375] 2023-04-28 12:24:29 -0400
-->
     <para>
      Tighten array dimensionality checks when converting Python
      list structures to multi-dimensional SQL arrays (Tom Lane)
     </para>

     <para>
      <application>plpython</application> could misbehave when dealing
      with empty sub-lists, or when the nesting of sub-lists is
      inconsistent so that the data does not represent a rectangular array
      of values.  The former should result in an empty output array, and
      the latter in an error.  But some cases resulted in a crash, and
      others in unexpected output.
     </para>
    </listitem>

    <listitem>
<!--
Author: Nathan Bossart <nathan@postgresql.org>
Branch: master [57d005170] 2023-05-04 16:23:05 -0700
Branch: REL_15_STABLE [825ebc984] 2023-05-04 16:24:48 -0700
Branch: REL_14_STABLE [52c9cf323] 2023-05-04 16:25:05 -0700
Branch: REL_13_STABLE [800531846] 2023-05-04 16:26:00 -0700
Branch: REL_12_STABLE [24964394a] 2023-05-04 16:26:05 -0700
Branch: REL_11_STABLE [0af386b0f] 2023-05-04 16:26:11 -0700
-->
     <para>
      Fix unwinding of exception stack
      in <application>plpython</application> (Xing Guo)
     </para>

     <para>
      Some rare failure cases could return without cleaning up the PG_TRY
      exception stack, risking a crash if another error was raised before
      the next stack level was unwound.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [e0a09d4e3] 2023-03-13 16:36:20 +0900
Branch: REL_15_STABLE [4493256c5] 2023-03-13 16:36:28 +0900
Branch: REL_14_STABLE [7e319231c] 2023-03-13 16:36:31 +0900
Branch: REL_13_STABLE [96bef4374] 2023-03-13 16:36:33 +0900
Branch: REL_12_STABLE [2bc36a56c] 2023-03-13 16:36:34 +0900
-->
     <para>
      Fix inconsistent GSS-encryption error handling
      in <application>libpq</application>'s
      <function>PQconnectPoll()</function>
      (Michael Paquier)
     </para>

     <para>
      With <option>gssencmode</option> set to <literal>require</literal>,
      the connection was not marked dead after a GSS initialization
      failure.  Make it fail immediately, as the equivalent case for TLS
      encryption has long done.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [f18029084] 2023-04-18 11:20:41 +0900
Branch: REL_15_STABLE [8c746be44] 2023-04-18 11:20:47 +0900
Branch: REL_14_STABLE [02f076454] 2023-04-18 11:20:50 +0900
Branch: REL_13_STABLE [e9e457d22] 2023-04-18 11:20:51 +0900
Branch: REL_12_STABLE [a28bd7713] 2023-04-18 11:20:53 +0900
Branch: REL_11_STABLE [9eb44bb04] 2023-04-18 11:20:55 +0900
Branch: REL_11_STABLE [dbd25dd0b] 2023-04-18 12:00:31 +0900
-->
     <para>
      Fix possible data corruption in <application>ecpg</application>
      programs built with the <option>-C ORACLE</option> option
      (Kyotaro Horiguchi)
     </para>

     <para>
      When <function>ecpg_get_data()</function> is called
      with <varname>varcharsize</varname> set to zero, it could write a
      terminating zero character into the last byte of the preceding
      field, truncating the data in that field.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bc8cd50fe] 2023-03-17 13:31:40 -0400
Branch: REL_15_STABLE [2b216da1e] 2023-03-17 13:31:40 -0400
Branch: REL_14_STABLE [5fc1ac151] 2023-03-17 13:31:40 -0400
Branch: REL_13_STABLE [7e7c5b683] 2023-03-17 13:31:40 -0400
Branch: REL_12_STABLE [8f83ce8c5] 2023-03-17 13:31:40 -0400
Branch: REL_11_STABLE [012ffb365] 2023-03-17 13:31:40 -0400
-->
     <para>
      Fix <application>pg_dump</application> so that partitioned tables
      that are hash-partitioned on an enum-type column can be restored
      successfully (Tom Lane)
     </para>

     <para>
      Since the hash codes for enum values depend on the OIDs assigned to
      the enum, they are typically different after a dump and restore,
      meaning that rows often need to go into a different partition than
      they were in originally.  Users can work around that by specifying
      the <option>--load-via-partition-root</option> option; but since
      there is very little chance of success without that,
      teach <application>pg_dump</application> to apply it automatically
      to such tables.
     </para>

     <para>
      Also, fix <application>pg_restore</application> to not try
      to <command>TRUNCATE</command> target tables before restoring into
      them when <option>--load-via-partition-root</option> mode is used.
      This avoids a hazard of deadlocks and lost data.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [df38157d9] 2023-04-27 11:55:06 -0400
Branch: REL_15_STABLE [85ec8bcce] 2023-04-27 11:55:06 -0400
Branch: REL_14_STABLE [c74f88c40] 2023-04-27 11:55:06 -0400
Branch: REL_13_STABLE [de2dfa053] 2023-04-27 11:55:06 -0400
Branch: REL_12_STABLE [ce9662598] 2023-04-27 11:55:06 -0400
Branch: REL_11_STABLE [c3c1097dc] 2023-04-27 11:55:06 -0400
-->
     <para>
      In <filename>contrib/hstore_plpython</filename>, avoid crashing if
      the Python value to be transformed isn't a mapping (Dmitry Dolgov,
      Tom Lane)
     </para>

     <para>
      This should give an error, but Python 3 changed some APIs in a way
      that caused the check to misbehave, allowing a crash to ensue.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1925ac281] 2023-03-11 12:15:41 -0500
Branch: REL_15_STABLE [6170386c7] 2023-03-11 12:15:41 -0500
Branch: REL_14_STABLE [786528039] 2023-03-11 12:15:41 -0500
Branch: REL_13_STABLE [bc436e4a9] 2023-03-11 12:15:41 -0500
Branch: REL_12_STABLE [1279414bc] 2023-03-11 12:15:41 -0500
Branch: REL_11_STABLE [b18327489] 2023-03-11 12:15:41 -0500
-->
     <para>
      Fix misbehavior in <filename>contrib/pg_trgm</filename> with an
      unsatisfiable regular expression (Tom Lane)
     </para>

     <para>
      A regex such as <literal>$foo</literal> is legal but unsatisfiable;
      the regex compiler recognizes that and produces an empty NFA graph.
      Attempting to optimize such a graph into a pg_trgm GIN or GiST index
      qualification resulted in accessing off the end of a work array,
      possibly leading to crashes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [eab2d3147] 2023-04-20 18:12:32 -0400
Branch: REL_15_STABLE [a14afd3bd] 2023-04-20 18:12:48 -0400
Branch: REL_14_STABLE [6d60b718c] 2023-04-20 18:12:32 -0400
Branch: REL_13_STABLE [6dce37203] 2023-04-20 18:12:32 -0400
Branch: REL_12_STABLE [e2e34dfff] 2023-04-20 18:12:32 -0400
Branch: REL_11_STABLE [c976ccc9e] 2023-04-20 18:12:32 -0400
-->
     <para>
      Use the <option>--strip-unneeded</option> option when stripping
      static libraries with
      GNU-compatible <application>strip</application> (Tom Lane)
     </para>

     <para>
      Previously, <literal>make install-strip</literal> used
      the <option>-x</option> option in this case.  This change avoids
      misbehavior of <application>llvm-strip</application>, and gives
      slightly smaller output as well.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [969509c3f] 2023-02-08 17:15:25 -0500
Branch: REL_15_STABLE [2ee703c9d] 2023-02-08 17:15:23 -0500
Branch: REL_14_STABLE [7f8778fcf] 2023-02-08 17:15:23 -0500
Branch: REL_13_STABLE [c7b608600] 2023-02-08 17:15:23 -0500
Branch: REL_12_STABLE [11f1f9f4f] 2023-02-08 17:15:27 -0500
Branch: REL_11_STABLE [36a646d99] 2023-02-08 17:15:27 -0500
-->
     <para>
      Stop recommending auto-download of DTD files for building the
      documentation, and indeed disable it (Aleksander Alekseev, Peter
      Eisentraut, Tom Lane)
     </para>

     <para>
      It appears no longer possible to build the SGML documentation
      without a local installation of the DocBook DTD files.
      Formerly <application>xsltproc</application> could download those
      files on-the-fly from sourceforge.net; but sourceforge.net now
      permits only HTTPS access, and no common version
      of <application>xsltproc</application> supports that.  Hence, remove
      the bits of our documentation suggesting that that's possible or
      useful, and instead
      add <application>xsltproc</application>'s <option>--nonet</option>
      option to the build recipes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [5d42a9751] 2023-05-05 07:09:52 +0200
Branch: REL_15_STABLE [3d37476f5] 2023-05-05 07:10:15 +0200
Branch: REL_14_STABLE [e07022500] 2023-05-05 07:10:30 +0200
Branch: REL_13_STABLE [670494477] 2023-05-05 07:11:58 +0200
Branch: REL_12_STABLE [14bb2e76c] 2023-05-05 07:12:18 +0200
Branch: REL_11_STABLE [b189f71e5] 2023-05-05 07:12:26 +0200
-->
     <para>
      When running TAP tests in PGXS builds, use a saner location for the
      temporary <filename>portlock</filename> directory (Peter Eisentraut)
     </para>

     <para>
      Place it under <filename>tmp_check</filename> in the build
      directory.  With the previous coding, a PGXS build would try to place
      it in the installation directory, which is not necessarily writable.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4ddee4d9d] 2023-04-18 14:46:39 -0400
Branch: REL_15_STABLE [62b22caa5] 2023-04-18 14:46:39 -0400
Branch: REL_14_STABLE [b79b36f26] 2023-04-18 14:46:39 -0400
Branch: REL_13_STABLE [87d8ec3e4] 2023-04-18 14:46:39 -0400
Branch: REL_12_STABLE [2ad35cf06] 2023-04-18 14:46:39 -0400
Branch: REL_11_STABLE [7228f2f81] 2023-04-18 14:46:39 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2023c for DST law changes in Egypt, Greenland, Morocco, and
      Palestine.
     </para>

     <para>
      When observing Moscow time, Europe/Kirov and Europe/Volgograd now
      use the abbreviations MSK/MSD instead of numeric abbreviations,
      for consistency with other timezones observing Moscow time.
      Also, America/Yellowknife is no longer distinct from America/Edmonton;
      this affects some pre-1948 timestamps in that area.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-14">
  <title>Release 12.14</title>

  <formalpara>
  <title>Release date:</title>
  <para>2023-02-09</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.13.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.14</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.10,
    see <xref linkend="release-12-10"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [71c37797d] 2023-02-06 11:20:07 +0900
Branch: REL_15_STABLE [715c345dd] 2023-02-06 11:20:20 +0900
Branch: REL_14_STABLE [626f2c1d6] 2023-02-06 11:20:23 +0900
Branch: REL_13_STABLE [45a945ee9] 2023-02-06 11:20:27 +0900
Branch: REL_12_STABLE [3f7342671] 2023-02-06 11:20:31 +0900
-->
     <para>
      <application>libpq</application> can leak memory contents after
      GSSAPI transport encryption initiation fails (Jacob Champion)
     </para>

     <para>
      A modified server, or an unauthenticated man-in-the-middle, can
      send a not-zero-terminated error message during setup of GSSAPI
      (Kerberos) transport encryption.  <application>libpq</application>
      will then copy that string, as well as following bytes in
      application memory up to the next zero byte, to its error report.
      Depending on what the calling application does with the error
      report, this could result in disclosure of application memory
      contents.  There is also a small probability of a crash due to
      reading beyond the end of memory.  Fix by properly zero-terminating
      the server message.
      (CVE-2022-41862)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c9f7f9264] 2023-01-21 13:10:29 -0500
Branch: REL_15_STABLE [9e4288ce6] 2023-01-21 13:10:29 -0500
Branch: REL_14_STABLE [70ec756b0] 2023-01-21 13:10:29 -0500
Branch: REL_13_STABLE [72d611109] 2023-01-21 13:10:29 -0500
Branch: REL_12_STABLE [a5f3f2fce] 2023-01-21 13:10:30 -0500
Branch: REL_11_STABLE [6c122edde] 2023-01-21 13:10:30 -0500
-->
     <para>
      Allow <literal>REPLICA IDENTITY</literal>
      to be set on an index that's not (yet) valid (Tom Lane)
     </para>

     <para>
      When <application>pg_dump</application> dumps a partitioned index
      that's marked <literal>REPLICA IDENTITY</literal>, it generates a
      command sequence that applies <literal>REPLICA IDENTITY</literal>
      before the partitioned index has been marked valid, causing restore
      to fail.  There seems no very good reason to prohibit doing it in
      that order, so allow it.  The marking will have no effect anyway
      until the index becomes valid.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [2605643a3] 2022-12-03 12:11:33 +0000
Branch: REL_15_STABLE [c67204db6] 2022-12-03 12:14:36 +0000
Branch: REL_14_STABLE [2c7ed9f75] 2022-12-03 12:16:07 +0000
Branch: REL_13_STABLE [3bed88123] 2022-12-03 12:17:47 +0000
Branch: REL_12_STABLE [33f600f04] 2022-12-03 12:18:58 +0000
Branch: REL_11_STABLE [30f9b03a0] 2022-12-03 12:20:02 +0000
-->
     <para>
      Fix handling of <literal>DEFAULT</literal> markers in rules that
      perform an <command>INSERT</command> from a
      multi-row <literal>VALUES</literal> list (Dean Rasheed)
     </para>

     <para>
      In some cases a <literal>DEFAULT</literal> marker would not get
      replaced with the proper default-value expression, leading to
      an <quote>unrecognized node type</quote> error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [3161ae86c] 2023-01-12 18:16:34 +0300
Branch: REL_15_STABLE [4dc3f94fa] 2023-01-12 18:17:43 +0300
Branch: REL_14_STABLE [0d9221f1d] 2023-01-12 18:18:04 +0300
Branch: REL_13_STABLE [2ff3ac3b5] 2023-01-12 18:18:31 +0300
Branch: REL_12_STABLE [9e24e4781] 2023-01-12 18:19:19 +0300
-->
     <para>
      Reject uses of undefined variables in <type>jsonpath</type>
      existence checks (Alexander Korotkov, David G. Johnston)
     </para>

     <para>
      While <type>jsonpath</type> match operators threw an error for an
      undefined variable in the path pattern, the existence operators
      silently treated it as a match.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [ffcf6f4cf] 2023-01-26 14:52:19 +1300
Branch: REL_15_STABLE [d9f5345bf] 2023-01-26 14:53:37 +1300
Branch: REL_14_STABLE [2f65b8468] 2023-01-26 14:54:17 +1300
Branch: REL_13_STABLE [1a5afe007] 2023-01-26 14:54:39 +1300
Branch: REL_12_STABLE [b55303792] 2023-01-26 14:55:03 +1300
Branch: REL_11_STABLE [d95dcc9ab] 2023-01-26 14:55:37 +1300
-->
     <para>
      Fix edge-case data corruption in parallel hash joins (Dmitry Astapov)
     </para>

     <para>
      If the final chunk of a large tuple being written out to a temporary
      file was exactly 32760 bytes, it would be corrupted due to a
      fencepost bug.  The query would typically fail later with
      corrupted-data symptoms.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [7e8a80d1f] 2023-01-19 13:13:05 +0900
Branch: REL_15_STABLE [49e3a5e71] 2023-01-19 13:13:27 +0900
Branch: REL_14_STABLE [2e21e2857] 2023-01-19 13:13:28 +0900
Branch: REL_13_STABLE [fed4e92f3] 2023-01-19 13:13:30 +0900
Branch: REL_12_STABLE [162a48287] 2023-01-19 13:13:32 +0900
Branch: REL_11_STABLE [0c2f34af7] 2023-01-19 13:13:34 +0900
-->
     <para>
      Honor non-default settings
      of <varname>checkpoint_completion_target</varname>
      (Bharath Rupireddy)
     </para>

     <para>
      Internal state was not updated after a change
      in <varname>checkpoint_completion_target</varname>, possibly
      resulting in performing checkpoint I/O faster or slower than
      desired, especially if that setting was changed on-the-fly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [44e9e3426] 2023-01-19 12:23:20 -0500
Branch: REL_15_STABLE [abe203304] 2023-01-19 12:23:20 -0500
Branch: REL_14_STABLE [103450724] 2023-01-19 12:23:20 -0500
Branch: REL_13_STABLE [1b9a0b96a] 2023-01-19 12:23:20 -0500
Branch: REL_12_STABLE [87591db19] 2023-01-19 12:23:20 -0500
Branch: REL_11_STABLE [0a269527f] 2023-01-19 12:23:20 -0500
-->
     <para>
      Log the correct ending timestamp
      in <varname>recovery_target_xid</varname> mode (Tom Lane)
     </para>

     <para>
      When ending recovery based on the <varname>recovery_target_xid</varname>
      setting with <varname>recovery_target_inclusive</varname>
      = <literal>off</literal>, we printed an incorrect timestamp (always
      2000-01-01) in the <quote>recovery stopping before
      ... transaction</quote> log message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: REL_13_STABLE [72b6098be] 2023-01-11 09:56:14 +0900
Branch: REL_12_STABLE [c0ee6943c] 2023-01-11 09:56:18 +0900
-->
     <para>
      Prevent <quote>wrong tuple length</quote> failure
      at the end of <command>VACUUM</command> (Ashwin Agrawal, Junfeng Yang)
     </para>

     <para>
      This occurred if <command>VACUUM</command> needed to update the
      current database's <structfield>datfrozenxid</structfield> value and
      the database has so many granted privileges that
      its <structfield>datacl</structfield> value has been pushed
      out-of-line.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [20432f873] 2022-12-13 14:23:58 -0500
Branch: REL_15_STABLE [18431ee6f] 2022-12-13 14:23:59 -0500
Branch: REL_14_STABLE [ae47f8a96] 2022-12-13 14:23:59 -0500
Branch: REL_13_STABLE [942cc240f] 2022-12-13 14:23:59 -0500
Branch: REL_12_STABLE [1cca4a75f] 2022-12-13 14:23:59 -0500
Branch: REL_11_STABLE [f48aa5df4] 2022-12-13 14:23:59 -0500
-->
     <para>
      In extended query protocol, avoid an immediate commit
      after <command>ANALYZE</command> if we're running a pipeline
      (Tom Lane)
     </para>

     <para>
      If there's not been an explicit <command>BEGIN
      TRANSACTION</command>, <command>ANALYZE</command> would take it on
      itself to commit, which should not happen within a pipelined series
      of commands.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [e52daaabf] 2023-01-21 06:08:00 -0800
Branch: REL_15_STABLE [b152bb7b2] 2023-01-21 06:08:03 -0800
Branch: REL_14_STABLE [6900aea67] 2023-01-21 06:08:04 -0800
Branch: REL_13_STABLE [a9bccffe5] 2023-01-21 06:08:04 -0800
Branch: REL_12_STABLE [e75b5c855] 2023-01-21 06:08:04 -0800
Branch: REL_11_STABLE [8f70de7e0] 2023-01-21 06:08:05 -0800
-->
     <para>
      Reject cancel request packets having the wrong length
      (Andrey Borodin)
     </para>

     <para>
      The server would process a cancel request even if its length word
      was too small.  This led to reading beyond the end of the allocated
      buffer.  In theory that could cause a segfault, but it seems quite
      unlikely to happen in practice, since the buffer would have to be
      very close to the end of memory.  The more likely outcome was a bogus
      log message about wrong backend PID or cancel code.  Complain about
      the wrong length, instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5beb7881f] 2022-12-22 10:35:02 -0500
Branch: REL_15_STABLE [1a3daa5bb] 2022-12-22 10:35:02 -0500
Branch: REL_14_STABLE [97431d673] 2022-12-22 10:35:02 -0500
Branch: REL_13_STABLE [4fceb454f] 2022-12-22 10:35:03 -0500
Branch: REL_12_STABLE [d572003f7] 2022-12-22 10:35:03 -0500
Branch: REL_11_STABLE [8cd700cc5] 2022-12-22 10:35:03 -0500
-->
     <para>
      Add recursion and looping defenses in subquery pullup (Tom Lane)
     </para>

     <para>
      A contrived query can result in deep recursion and unreasonable
      amounts of time spent trying to flatten subqueries.  A proper fix
      for that seems unduly invasive for a back-patch, but we can at least
      add stack depth checks and an interrupt check to allow the query to
      be cancelled.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [fe12f2f8f] 2022-12-04 13:17:18 -0500
Branch: REL_15_STABLE [bf8fd64ff] 2022-12-04 13:17:18 -0500
Branch: REL_14_STABLE [ec3daeec3] 2022-12-04 13:17:18 -0500
Branch: REL_13_STABLE [4ebca555c] 2022-12-04 13:17:18 -0500
Branch: REL_12_STABLE [1ff549e84] 2022-12-04 13:17:18 -0500
Branch: REL_11_STABLE [2df073313] 2022-12-04 13:17:18 -0500
-->
     <para>
      Fix partitionwise-join code to tolerate failure to produce a plan for
      each partition (Tom Lane)
     </para>

     <para>
      This could result in <quote>could not devise a query plan for the
      given query</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9c6ad5eaa] 2022-11-22 14:40:20 -0500
Branch: REL_15_STABLE [2debceed2] 2022-11-22 14:40:44 -0500
Branch: REL_14_STABLE [bd06fe4de] 2022-11-22 14:40:45 -0500
Branch: REL_13_STABLE [6e639267a] 2022-11-22 14:40:45 -0500
Branch: REL_12_STABLE [ec10b6139] 2022-11-22 14:40:45 -0500
Branch: REL_11_STABLE [b96a096db] 2022-11-22 14:40:46 -0500
-->
     <para>
      Limit the amount of cleanup work done
      by <function>get_actual_variable_range</function> (Simon Riggs)
     </para>

     <para>
      Planner runs occurring just after deletion of a large number of
      tuples appearing at the end of an index could expend significant
      amounts of work setting the <quote>killed</quote> bits for those
      index entries.  Limit the amount of work done in any one query by
      giving up on this process after examining 100 heap pages.  All the
      cleanup will still happen eventually, but without so large a
      performance hiccup.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5644d6f90] 2022-11-21 17:07:29 -0500
Branch: REL_15_STABLE [0353db996] 2022-11-21 17:07:07 -0500
Branch: REL_14_STABLE [1b9c04b13] 2022-11-21 17:07:07 -0500
Branch: REL_13_STABLE [74670688f] 2022-11-21 17:07:07 -0500
Branch: REL_12_STABLE [1aed4c4fd] 2022-11-21 17:07:07 -0500
Branch: REL_11_STABLE [c0eed8891] 2022-11-21 17:07:07 -0500
-->
     <para>
      Ensure that execution of full-text-search queries can be cancelled
      while they are performing phrase matches (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [edf12e7bb] 2022-12-01 11:49:15 -0800
Branch: REL_15_STABLE [9377b4f30] 2022-12-01 11:55:59 -0800
Branch: REL_14_STABLE [47e1224d5] 2022-12-01 11:53:53 -0800
Branch: REL_13_STABLE [a844052b5] 2022-12-01 11:52:06 -0800
Branch: REL_12_STABLE [f98c4fb1d] 2022-12-01 11:49:43 -0800
-->
     <para>
      Fix memory leak in hashing strings with nondeterministic collations
      (Jeff Davis)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [bc54ef4ec] 2023-01-23 18:27:42 -0800
Branch: REL_15_STABLE [704a330a9] 2023-01-23 18:27:45 -0800
Branch: REL_14_STABLE [0a796b8b3] 2023-01-23 18:27:48 -0800
Branch: REL_13_STABLE [c5864805b] 2023-01-23 18:27:51 -0800
Branch: REL_12_STABLE [92fc12787] 2023-01-23 18:27:55 -0800
Branch: REL_11_STABLE [243373159] 2023-01-23 18:27:58 -0800
-->
     <para>
      Clean up the <application>libpq</application> connection object
      after a failed replication connection attempt (Andres Freund)
     </para>

     <para>
      The previous coding leaked the connection object.  In background
      code paths that's pretty harmless because the calling process will
      give up and exit.  But in commands such as <command>CREATE
      SUBSCRIPTION</command>, such a failure resulted in a small
      session-lifespan memory leak.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8242752f9] 2022-11-29 15:43:17 -0500
Branch: REL_15_STABLE [55fa993d7] 2022-11-29 15:43:17 -0500
Branch: REL_14_STABLE [06998eab1] 2022-11-29 15:43:17 -0500
Branch: REL_13_STABLE [6e8ad1152] 2022-11-29 15:43:17 -0500
Branch: REL_12_STABLE [c4a153d77] 2022-11-29 15:43:17 -0500
Branch: REL_11_STABLE [a6c9e1db2] 2022-11-29 15:43:17 -0500
-->
     <para>
      In hot-standby servers, reduce processing effort for tracking XIDs
      known to be active on the primary (Simon Riggs, Michail Nikolaev)
     </para>

     <para>
      Insufficiently-aggressive cleanup of the KnownAssignedXids array
      could lead to poor performance, particularly
      when <varname>max_connections</varname> is set to a large value on
      the standby.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: REL_15_STABLE [898ef41bf] 2022-11-25 09:38:03 +0530
Branch: REL_14_STABLE [9f2cc1a73] 2022-11-25 09:25:50 +0530
Branch: REL_13_STABLE [4ec157c15] 2022-11-25 09:15:31 +0530
Branch: REL_12_STABLE [aa9d916f6] 2022-11-25 09:00:15 +0530
Branch: REL_11_STABLE [9b788aafd] 2022-11-25 08:56:54 +0530
-->
     <para>
      Fix uninitialized-memory usage in logical decoding (Masahiko Sawada)
     </para>

     <para>
      In certain cases, resumption of logical decoding could try to re-use
      XID data that had already been freed, leading to unpredictable
      behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [e848be60b] 2022-11-14 10:43:33 +0530
Branch: REL_15_STABLE [e49e19181] 2022-11-14 10:32:47 +0530
Branch: REL_14_STABLE [9693f1900] 2022-11-14 10:22:28 +0530
Branch: REL_13_STABLE [20c223336] 2022-11-14 10:11:10 +0530
Branch: REL_12_STABLE [4dccccb37] 2022-11-14 10:01:14 +0530
Branch: REL_11_STABLE [1703033f8] 2022-11-14 09:52:06 +0530
-->
     <para>
      Avoid rare <quote>failed to acquire cleanup lock</quote> panic
      during WAL replay of hash-index page split operations (Robert Haas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [d6a3dbe14] 2022-11-11 12:38:29 -0800
Branch: REL_15_STABLE [7bf713dd2] 2022-11-11 12:46:11 -0800
Branch: REL_14_STABLE [f893af496] 2022-11-11 12:46:22 -0800
Branch: REL_13_STABLE [58a45bb1d] 2022-11-11 12:46:34 -0800
Branch: REL_12_STABLE [7dd39e9e8] 2022-11-11 12:46:44 -0800
Branch: REL_11_STABLE [5eaf3e375] 2022-11-11 12:46:52 -0800
-->
     <para>
      Advance a heap page's LSN when setting its all-visible bit during
      WAL replay (Jeff Davis)
     </para>

     <para>
      Failure to do this left the page possibly different on standby
      servers than the primary, and violated some other expectations about
      when the LSN changes.  This seems only a theoretical hazard so
      far as <productname>PostgreSQL</productname> itself is concerned,
      but it could upset third-party tools.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_14_STABLE [32d5a4974] 2022-11-17 16:54:30 -0500
Branch: REL_13_STABLE [9a299cf7c] 2022-11-17 16:54:30 -0500
Branch: REL_12_STABLE [e21856fd6] 2022-11-17 16:54:31 -0500
Branch: REL_11_STABLE [d4acf2eb9] 2022-11-17 16:54:31 -0500
-->
     <para>
      Prevent unsafe usage of a relation cache
      entry's <structfield>rd_smgr</structfield> pointer (Amul Sul)
     </para>

     <para>
      Remove various assumptions that <structfield>rd_smgr</structfield>
      would stay valid over a series of operations, by wrapping all uses
      of it in a function that will recompute it if needed.  This prevents
      bugs occurring when an unexpected cache flush occurs partway through
      such a series.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [f1821b58f] 2023-01-13 11:02:12 +1300
Branch: REL_15_STABLE [8a98523a5] 2023-01-13 11:02:00 +1300
Branch: REL_14_STABLE [547e60b83] 2023-01-13 10:57:29 +1300
Branch: REL_13_STABLE [c159b0383] 2023-01-13 10:54:49 +1300
Branch: REL_12_STABLE [bf388ab82] 2023-01-13 10:54:34 +1300
Branch: REL_11_STABLE [1b40710a8] 2023-01-13 10:54:20 +1300
-->
     <para>
      Fix latent buffer-overrun problem in <literal>WaitEventSet</literal>
      logic (Thomas Munro)
     </para>

     <para>
      The <function>epoll</function>-based
      and <function>kqueue</function>-based implementations could ask the
      kernel for too many events if the size of their internal buffer was
      different from the size of the caller's output buffer.  That case is
      not known to occur in released <productname>PostgreSQL</productname>
      versions, but this error is a hazard for external modules and future
      bug fixes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [8c954168c] 2022-11-19 12:22:04 -0800
Branch: REL_15_STABLE [a0d35ebcc] 2022-11-19 12:33:11 -0800
Branch: REL_14_STABLE [fc4154286] 2022-11-19 12:33:14 -0800
Branch: REL_13_STABLE [c13667b51] 2022-11-19 12:36:33 -0800
Branch: REL_12_STABLE [4cbcb7ed8] 2022-11-19 12:36:48 -0800
Branch: REL_11_STABLE [140c80372] 2022-11-19 12:36:52 -0800
-->
     <para>
      Avoid nominally-undefined behavior when accessing shared memory in
      32-bit builds (Andres Freund)
     </para>

     <para>
      clang's undefined-behavior sanitizer complained about use of a
      pointer that was less aligned than it should be.  It's very unlikely
      that this would cause a problem in non-debug builds, but it's worth
      fixing for testing purposes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [51dfaa0b0] 2022-11-29 10:52:44 -0500
Branch: REL_15_STABLE [556c0b913] 2022-11-29 10:52:44 -0500
Branch: REL_14_STABLE [0224646be] 2022-11-29 10:52:44 -0500
Branch: REL_13_STABLE [aca695fb6] 2022-11-29 10:52:44 -0500
Branch: REL_12_STABLE [bb8d48cb9] 2022-11-29 10:52:44 -0500
-->
     <para>
      Remove faulty assertion in useless-RESULT-RTE optimization logic
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [2fcf685f6] 2022-12-23 10:04:18 +0900
Branch: REL_15_STABLE [e3897a3a4] 2022-12-23 10:04:30 +0900
Branch: REL_14_STABLE [7ad458e06] 2022-12-23 10:04:33 +0900
Branch: REL_13_STABLE [4dbe72d61] 2022-12-23 10:04:34 +0900
Branch: REL_12_STABLE [7445869e1] 2022-12-23 10:04:36 +0900
Branch: REL_11_STABLE [df6fea51f] 2022-12-23 10:04:37 +0900
-->
     <para>
      Fix copy-and-paste errors in cache-lookup-failure messages for ACL
      checks (Justin Pryzby)
     </para>

     <para>
      In principle these errors should never be reached.  But if they are,
      some of them reported the wrong type of object.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_14_STABLE [55f30e6c7] 2022-11-19 11:40:30 -0500
Branch: REL_13_STABLE [e46e986ba] 2022-11-19 11:40:30 -0500
Branch: REL_12_STABLE [344b78492] 2022-11-19 11:40:30 -0500
Branch: REL_11_STABLE [b1f106420] 2022-11-19 11:40:30 -0500
Branch: REL_14_STABLE [03ac48549] 2022-11-19 12:00:27 -0500
Branch: REL_13_STABLE [a5b26aaaf] 2022-11-19 12:00:27 -0500
Branch: REL_12_STABLE [1ed6f1b91] 2022-11-19 12:00:27 -0500
Branch: REL_11_STABLE [b7333e826] 2022-11-19 12:00:27 -0500
-->
     <para>
      In <application>pg_dump</application>,
      avoid calling unsafe server functions before we have locks on the
      tables to be examined (Tom Lane, Gilles Darold)
     </para>

     <para>
      <application>pg_dump</application> uses certain server functions
      that can fail if examining a table that gets dropped concurrently.
      Avoid this type of failure by ensuring that we obtain access share
      lock before inquiring too deeply into a table's properties, and that
      we don't apply such functions to tables we don't intend to dump at
      all.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [e7a59094b] 2023-01-06 11:18:44 +0000
Branch: REL_15_STABLE [2daf4664c] 2023-01-06 11:16:53 +0000
Branch: REL_14_STABLE [48599a18d] 2023-01-06 11:15:22 +0000
Branch: REL_13_STABLE [2ad4abedf] 2023-01-06 11:13:34 +0000
Branch: REL_12_STABLE [274185d11] 2023-01-06 11:11:51 +0000
Branch: REL_11_STABLE [c54b88870] 2023-01-06 11:09:56 +0000
-->
     <para>
      Fix tab completion of <command>ALTER
      FUNCTION/PROCEDURE/ROUTINE</command> ... <command>SET
      SCHEMA</command> (Dean Rasheed)
     </para>
    </listitem>

    <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
Branch: REL_12_STABLE [69f75bf82] 2022-12-15 21:15:00 +0900
-->
     <para>
      Fix faulty assertion in <filename>contrib/postgres_fdw</filename>
      (Etsuro Fujita)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [701c881f7] 2022-12-21 17:51:50 -0500
Branch: REL_15_STABLE [b87037b37] 2022-12-21 17:51:50 -0500
Branch: REL_14_STABLE [f489b480f] 2022-12-21 17:51:50 -0500
Branch: REL_13_STABLE [d35f1d485] 2022-12-21 17:51:50 -0500
Branch: REL_12_STABLE [c8314d62a] 2022-12-21 17:51:50 -0500
Branch: REL_11_STABLE [0ff4056b8] 2022-12-21 17:51:50 -0500
-->
     <para>
      Fix <filename>contrib/seg</filename> to not crash or print garbage
      if an input number has more than 127 digits (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: REL_13_STABLE [c304c069d] 2022-11-09 09:39:53 +0900
Branch: REL_12_STABLE [edb4ef48d] 2022-11-09 09:39:55 +0900
Branch: REL_11_STABLE [91723759e] 2022-11-09 09:39:57 +0900
Branch: REL_10_STABLE [8f5d4ee6c] 2022-11-09 09:39:58 +0900
Branch: REL9_6_STABLE [b2b988110] 2022-11-09 09:40:01 +0900
Branch: REL9_5_STABLE [40064e103] 2022-11-09 09:40:02 +0900
Branch: REL9_4_STABLE [0f5812df6] 2022-11-09 09:40:05 +0900
Branch: REL9_3_STABLE [a5171b880] 2022-11-09 09:40:06 +0900
Branch: REL9_2_STABLE [c58c0770a] 2022-11-09 09:40:09 +0900
-->
     <para>
      In <filename>contrib/sepgsql</filename>, avoid deprecation warnings
      with recent <application>libselinux</application> (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_15_STABLE [576506303] 2022-11-10 10:23:49 -0500
Branch: REL_14_STABLE [06dca17ad] 2022-11-10 10:23:49 -0500
Branch: REL_13_STABLE [0942acb73] 2022-11-10 10:23:49 -0500
Branch: REL_12_STABLE [cf0f465c0] 2022-11-10 10:23:49 -0500
-->
     <para>
      Fix build on Microsoft Visual Studio 2013 (Tom Lane)
     </para>

     <para>
      A previous patch supposed that all platforms of interest
      have <function>snprintf()</function>, but MSVC 2013 isn't quite
      there yet.  Revert to using <function>sprintf()</function> on that
      platform.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [341f4e002] 2022-11-25 15:28:38 -0500
Branch: REL_15_STABLE [fed54fc9a] 2022-11-25 15:37:33 -0500
Branch: REL_14_STABLE [f76191fd9] 2022-11-25 15:37:33 -0500
Branch: REL_13_STABLE [9fe5cff14] 2022-11-25 15:37:33 -0500
Branch: REL_12_STABLE [171c7fffa] 2022-11-25 15:37:34 -0500
Branch: REL_11_STABLE [ae7c51213] 2022-11-25 15:37:34 -0500
-->
     <para>
      Fix compile failure in building PL/Perl with MSVC when using
      Strawberry Perl (Andrew Dunstan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [ccc59a83c] 2022-11-27 09:03:22 -0500
Branch: REL_15_STABLE [b5d8fd418] 2022-11-27 09:18:14 -0500
Branch: REL_14_STABLE [f3f70b8de] 2022-11-27 09:18:20 -0500
Branch: REL_13_STABLE [68d89d80c] 2022-11-27 09:18:32 -0500
Branch: REL_12_STABLE [85565cbca] 2022-11-27 09:18:40 -0500
Branch: REL_11_STABLE [724dd5649] 2022-11-27 09:18:46 -0500
-->
     <para>
      Fix mismatch of PL/Perl built with MSVC versus a Perl library built
      with gcc (Andrew Dunstan)
     </para>

     <para>
      Such combinations could previously fail with <quote>loadable library
      and perl binaries are mismatched</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [388e80132] 2022-12-29 12:47:29 -0800
Branch: REL_15_STABLE [c6e75e4c2] 2023-01-02 15:49:33 -0800
Branch: REL_14_STABLE [7b5dec760] 2023-01-02 15:50:00 -0800
Branch: REL_13_STABLE [ce073d014] 2023-01-02 15:50:33 -0800
Branch: REL_12_STABLE [f0e13802f] 2023-01-02 15:51:03 -0800
Branch: REL_11_STABLE [99f8bc335] 2023-01-02 15:51:05 -0800
-->
     <para>
      Suppress compiler warnings from Perl's header files (Andres Freund)
     </para>

     <para>
      Our preferred compiler options provoke warnings about constructs
      appearing in recent versions of Perl's header files.  When using
      <application>gcc</application>, we can suppress these warnings with
      a pragma.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_15_STABLE [9a40a0311] 2023-01-20 11:58:12 -0500
Branch: REL_14_STABLE [21c058648] 2023-01-20 11:58:12 -0500
Branch: REL_13_STABLE [c78f109b8] 2023-01-20 11:58:12 -0500
Branch: REL_12_STABLE [6d066d56b] 2023-01-20 11:58:12 -0500
Branch: REL_11_STABLE [b69e9dfab] 2023-01-20 11:58:12 -0500
-->
     <para>
      Fix <application>pg_waldump</application> to build on compilers that
      don't discard unused static-inline functions (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [758f44bc3] 2023-01-31 17:36:55 -0500
Branch: REL_15_STABLE [65f0d9d27] 2023-01-31 17:37:06 -0500
Branch: REL_14_STABLE [7e6154779] 2023-01-31 17:37:14 -0500
Branch: REL_13_STABLE [20d9da107] 2023-01-31 17:37:22 -0500
Branch: REL_12_STABLE [2c95d8776] 2023-01-31 17:37:28 -0500
Branch: REL_11_STABLE [7ddc428ef] 2023-01-31 17:37:34 -0500
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2022g for DST law changes in Greenland and Mexico,
      plus historical corrections for northern Canada, Colombia, and
      Singapore.
     </para>

     <para>
      Notably, a new timezone America/Ciudad_Juarez has been split off
      from America/Ojinaga.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-13">
  <title>Release 12.13</title>

  <formalpara>
  <title>Release date:</title>
  <para>2022-11-10</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.12.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.13</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.10,
    see <xref linkend="release-12-10"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2dc2e4e31] 2022-09-30 19:37:00 -0400
Branch: REL_15_STABLE Release: REL_15_0 [2267085c1] 2022-09-30 19:36:46 -0400
Branch: REL_14_STABLE [b93d7e688] 2022-09-30 19:36:46 -0400
Branch: REL_13_STABLE [92941f264] 2022-09-30 19:36:46 -0400
Branch: REL_12_STABLE [e7bd2d671] 2022-09-30 19:36:46 -0400
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [163b0993a] 2022-09-22 11:04:00 -0700
Branch: REL_15_STABLE Release: REL_15_0 [dd6070bc8] 2022-09-22 11:04:36 -0700
Branch: REL_14_STABLE [21934612d] 2022-09-22 11:04:58 -0700
Branch: REL_13_STABLE [410c422b7] 2022-09-22 11:06:42 -0700
Branch: REL_12_STABLE [cab72f0fd] 2022-09-22 11:07:05 -0700
-->
     <para>
      Avoid rare PANIC during updates occurring concurrently
      with <command>VACUUM</command> (Tom Lane, Jeff Davis)
     </para>

     <para>
      If a concurrent <command>VACUUM</command> sets the all-visible flag
      bit in a page that <command>UPDATE</command>
      or <command>DELETE</command> is in process of modifying, the
      updating command needs to clear that bit again; but some code paths
      failed to do so, ending in a PANIC exit and database restart.
     </para>

     <para>
      This is known to be possible in versions 14 and 15.  It may be only
      latent in previous branches.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: REL_13_STABLE [43e409cea] 2022-09-05 11:20:05 -0700
Branch: REL_12_STABLE [7adc34832] 2022-09-05 11:20:03 -0700
Branch: REL_11_STABLE [a228cca46] 2022-09-05 11:20:01 -0700
Branch: REL_10_STABLE [cfe41f976] 2022-09-05 11:19:59 -0700
-->
     <para>
      Fix <command>VACUUM</command> to press on if an attempted page
      deletion in a btree index fails to find the page's parent downlink
      (Peter Geoghegan)
     </para>

     <para>
      Rather than throwing an error, just log the issue and continue
      without deleting the empty page.  Previously, a buggy operator class
      or corrupted index could indefinitely prevent completion of
      vacuuming of the index, eventually leading to transaction wraparound
      problems.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b8f2687fd] 2022-10-11 18:24:14 -0400
Branch: REL_15_STABLE [07ce67698] 2022-10-11 18:24:14 -0400
Branch: REL_14_STABLE [3162bd95c] 2022-10-11 18:24:14 -0400
Branch: REL_13_STABLE [21e042b0b] 2022-10-11 18:24:14 -0400
Branch: REL_12_STABLE [abc510fa2] 2022-10-11 18:24:15 -0400
Branch: REL_11_STABLE [addde9bc6] 2022-10-11 18:24:15 -0400
Branch: REL_10_STABLE [23e2a06ac] 2022-10-11 18:24:15 -0400
-->
     <para>
      Fix handling of <literal>DEFAULT</literal> tokens that appear
      in a multi-row <literal>VALUES</literal> clause of an
      <command>INSERT</command> on an updatable view (Tom Lane)
     </para>

     <para>
      This oversight could lead to <quote>cache lookup failed for
      type</quote> errors, or in older branches even to crashes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [797e313dc] 2022-10-17 12:14:39 -0400
Branch: REL_15_STABLE [4a41a069e] 2022-10-17 12:14:39 -0400
Branch: REL_14_STABLE [2f26cec48] 2022-10-17 12:14:39 -0400
Branch: REL_13_STABLE [b21615d1e] 2022-10-17 12:14:39 -0400
Branch: REL_12_STABLE [65c1106d8] 2022-10-17 12:14:39 -0400
Branch: REL_11_STABLE [e9377e3e5] 2022-10-17 12:14:39 -0400
Branch: REL_10_STABLE [ecf4ce689] 2022-10-17 12:14:39 -0400
-->
     <para>
      Disallow rules named <literal>_RETURN</literal> that are
      not <literal>ON SELECT</literal> (Tom Lane)
     </para>

     <para>
      This avoids confusion between a view's <literal>ON SELECT</literal>
      rule and any other rules it may have.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [216f9c1ab] 2022-09-25 17:10:58 -0400
Branch: REL_15_STABLE Release: REL_15_0 [c82766c02] 2022-09-25 17:10:58 -0400
Branch: REL_14_STABLE [992376461] 2022-09-25 17:10:58 -0400
Branch: REL_13_STABLE [8c17c8615] 2022-09-25 17:10:58 -0400
Branch: REL_12_STABLE [519763094] 2022-09-25 17:10:58 -0400
-->
     <para>
      Fix resource management bug in saving tuples
      for <literal>AFTER</literal> triggers (Tom Lane)
     </para>

     <para>
      Given the right circumstances, this manifested as a <quote>tupdesc
      reference <replaceable>NNNN</replaceable> is not owned by resource
      owner</quote> error followed by a PANIC exit.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_13_STABLE [3f7323cbb] 2022-08-27 12:11:20 -0400
Branch: REL_12_STABLE [f8e70cfb8] 2022-08-27 12:11:20 -0400
Branch: REL_11_STABLE [d9ebc582f] 2022-08-27 12:11:20 -0400
Branch: REL_10_STABLE [e1ea6f374] 2022-08-27 12:11:20 -0400
Branch: REL_13_STABLE [18f51083c] 2022-09-02 14:54:40 -0400
Branch: REL_12_STABLE [df92bc115] 2022-09-02 14:54:40 -0400
Branch: REL_11_STABLE [56dc44244] 2022-09-02 14:54:40 -0400
Branch: REL_10_STABLE [42d0d46f9] 2022-09-02 14:54:41 -0400
Branch: REL_13_STABLE [ccbb54c72] 2022-09-06 16:38:18 -0400
Branch: REL_12_STABLE [4d7c0fe51] 2022-09-06 16:38:18 -0400
Branch: REL_11_STABLE [9bcf6fb28] 2022-09-06 16:38:18 -0400
Branch: REL_10_STABLE [174c929e3] 2022-09-06 16:38:18 -0400
-->
     <para>
      Repair rare failure of MULTIEXPR_SUBLINK subplans in inherited
      updates (Tom Lane)
     </para>

     <para>
      Use of the syntax <literal>UPDATE tab SET (c1, ...) = (SELECT
      ...)</literal> with an inherited or partitioned target table could
      result in failure if the child tables are sufficiently dissimilar.
      This typically manifested as failure of consistency checks in the
      executor; but a crash or incorrect data updates are also possible.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [b0284bfb1] 2022-11-03 20:40:21 +0100
Branch: REL_15_STABLE [c301e1c0c] 2022-11-03 20:40:21 +0100
Branch: REL_14_STABLE [18865f4df] 2022-11-03 20:40:21 +0100
Branch: REL_13_STABLE [41b6e7c9a] 2022-11-03 20:40:21 +0100
Branch: REL_12_STABLE [ab70b3a52] 2022-11-03 20:40:21 +0100
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [614a406b4] 2022-10-07 19:37:48 +0200
Branch: REL_15_STABLE Release: REL_15_0 [6083132ab] 2022-10-07 19:37:48 +0200
Branch: REL_14_STABLE [483d26930] 2022-10-07 19:37:48 +0200
Branch: REL_13_STABLE [7d520e68e] 2022-10-07 19:37:48 +0200
Branch: REL_12_STABLE [669803af0] 2022-10-07 19:37:48 +0200
-->
     <para>
      Fix construction of per-partition foreign key constraints while
      doing <command>ALTER TABLE ATTACH PARTITION</command>
      (Jehan-Guillaume de Rorthais, &Aacute;lvaro Herrera)
     </para>

     <para>
      Previously, incorrect or duplicate constraints could be constructed
      for the newly-added partition.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [e7936f8b3] 2022-09-08 13:17:02 +0200
Branch: REL_15_STABLE Release: REL_15_0 [ade2409b1] 2022-09-08 13:17:02 +0200
Branch: REL_14_STABLE [640c20d62] 2022-09-08 13:17:02 +0200
Branch: REL_13_STABLE [80ef25b1a] 2022-09-08 13:17:02 +0200
Branch: REL_12_STABLE [562e100ae] 2022-09-08 13:17:02 +0200
-->
     <para>
      Fix generation of constraint names for per-partition foreign key
      constraints (Jehan-Guillaume de Rorthais)
     </para>

     <para>
      If the initially-given name is already in use for some constraint of
      the partition, a new one is selected; but it wasn't being spelled as
      intended.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e6dbb4848] 2022-08-18 12:12:03 -0400
Branch: REL_15_STABLE Release: REL_15_0 [2a42c1c51] 2022-08-18 12:12:03 -0400
Branch: REL_14_STABLE [3bfea5cbb] 2022-08-18 12:11:47 -0400
Branch: REL_13_STABLE [9f0073ef7] 2022-08-18 12:11:47 -0400
Branch: REL_12_STABLE [2cf16cd74] 2022-08-18 12:11:47 -0400
Branch: REL_11_STABLE [116f20f92] 2022-08-18 12:11:47 -0400
-->
     <para>
      Fix incorrect matching of index expressions and predicates when
      creating a partitioned index (Richard Guo, Tom Lane)
     </para>

     <para>
      While creating a partitioned index, we try to identify any existing
      indexes on the partitions that match the partitioned index, so that
      we can absorb those as child indexes instead of building new ones.
      Matching of expressions was not done right, so that a usable child
      index might be ignored, leading to creation of a duplicative index.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [6672d7913] 2022-08-29 11:07:37 -0400
Branch: REL_15_STABLE Release: REL_15_0 [eb29fa388] 2022-08-29 11:18:55 -0400
Branch: REL_14_STABLE [0e54a5e27] 2022-08-29 11:25:00 -0400
Branch: REL_13_STABLE [3f2701cda] 2022-08-29 11:30:17 -0400
Branch: REL_12_STABLE [3c0ef0832] 2022-08-29 11:55:49 -0400
Branch: REL_11_STABLE [002fba80e] 2022-08-29 12:06:30 -0400
Branch: REL_10_STABLE [0b3ff539d] 2022-08-29 12:21:50 -0400
-->
     <para>
      Prevent WAL corruption after a standby promotion (Dilip Kumar,
      Robert Haas)
     </para>

     <para>
      When a <productname>PostgreSQL</productname> instance performing
      archive recovery (but not using standby mode) is promoted, and the
      last WAL segment that it attempted to read ended in a partial
      record, the instance would write an invalid WAL segment on the new
      timeline.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [56b662523] 2022-10-13 09:31:57 +0900
Branch: REL_15_STABLE [ca4070f2b] 2022-10-26 09:41:13 +0900
Branch: REL_14_STABLE [5a30d43fa] 2022-10-26 09:41:18 +0900
Branch: REL_13_STABLE [594b97509] 2022-10-26 09:41:22 +0900
Branch: REL_12_STABLE [51c24d9e2] 2022-10-26 09:41:26 +0900
Branch: REL_11_STABLE [341fba2a6] 2022-10-26 09:41:28 +0900
Branch: REL_10_STABLE [b02fc7df1] 2022-10-26 09:41:31 +0900
-->
     <para>
      Fix mis-ordering of WAL operations in fast insert path for GIN
      indexes (Matthias van de Meent, Zhang Mingli)
     </para>

     <para>
      This mistake is not known to have any negative consequences within
      core <productname>PostgreSQL</productname>, but it did cause issues
      for some extensions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [16b1fe003] 2022-10-20 08:49:48 +0530
Branch: REL_15_STABLE [64ff0fe4e] 2022-10-20 09:43:59 +0530
Branch: REL_14_STABLE [a592ed923] 2022-10-20 09:34:18 +0530
Branch: REL_13_STABLE [25f7be1ca] 2022-10-20 09:25:13 +0530
Branch: REL_12_STABLE [1bf4d9206] 2022-10-20 09:16:28 +0530
Branch: REL_11_STABLE [5f7076cb6] 2022-10-20 09:07:04 +0530
Branch: REL_10_STABLE [10ed7b9e4] 2022-10-20 08:58:11 +0530
Branch: REL_15_STABLE [343afa967] 2022-10-21 10:03:35 +0530
Branch: REL_14_STABLE [4fbe6096b] 2022-10-21 09:52:44 +0530
Branch: REL_13_STABLE [38dbaaf27] 2022-10-21 09:42:24 +0530
Branch: REL_12_STABLE [02600886c] 2022-10-21 09:32:21 +0530
Branch: REL_11_STABLE [216af69ae] 2022-10-21 09:22:20 +0530
-->
     <para>
      Fix bugs in logical decoding when replay starts from a point
      between the beginning of a transaction and the beginning of its
      subtransaction (Masahiko Sawada, Kuroda Hayato)
     </para>

     <para>
      These errors could lead to assertion failures in debug builds, and
      otherwise to memory leaks.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: REL_15_STABLE Release: REL_15_0 [272248a0c] 2022-08-11 09:56:49 +0530
Branch: REL_14_STABLE [68dcce247] 2022-08-11 09:45:04 +0530
Branch: REL_13_STABLE [547b96368] 2022-08-11 09:30:55 +0530
Branch: REL_12_STABLE [794460783] 2022-08-11 09:09:36 +0530
Branch: REL_11_STABLE [e721123b7] 2022-08-11 08:55:31 +0530
Branch: REL_10_STABLE [bf0718c13] 2022-08-11 08:45:20 +0530
-->
     <para>
      Prevent examining system catalogs with the wrong snapshot during
      logical decoding (Masahiko Sawada)
     </para>

     <para>
      If decoding begins partway through a transaction that modifies
      system catalogs, the decoder may not recognize that, causing it to
      fail to treat that transaction as in-progress for catalog lookups.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [ce20f8b9f] 2022-10-21 12:57:18 +0530
Branch: REL_15_STABLE [10eaa9750] 2022-10-21 12:43:28 +0530
Branch: REL_14_STABLE [36fc013fa] 2022-10-21 12:33:47 +0530
Branch: REL_13_STABLE [1eed947f9] 2022-10-21 12:22:47 +0530
Branch: REL_12_STABLE [f7f82cf05] 2022-10-21 12:10:11 +0530
Branch: REL_11_STABLE [5c51afe23] 2022-10-21 12:08:14 +0530
Branch: REL_10_STABLE [61838d2dd] 2022-10-21 11:54:34 +0530
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [f972ec5c2] 2022-08-23 10:20:02 +0530
Branch: REL_15_STABLE Release: REL_15_0 [42681dffa] 2022-08-23 10:08:43 +0530
Branch: REL_14_STABLE [6d05d575b] 2022-08-23 09:24:51 +0530
Branch: REL_13_STABLE [4985a4591] 2022-08-23 09:10:28 +0530
Branch: REL_12_STABLE [9415873ae] 2022-08-23 08:51:20 +0530
Branch: REL_11_STABLE [51e9469a4] 2022-08-23 08:42:51 +0530
Branch: REL_10_STABLE [6b50433e8] 2022-08-23 08:39:31 +0530
-->
     <para>
      Accept interrupts in more places during logical decoding (Amit
      Kapila, Masahiko Sawada)
     </para>

     <para>
      This ameliorates problems with slow shutdown of replication workers.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [dea834938] 2022-11-03 12:02:14 -0400
Branch: REL_15_STABLE [f2dc7f9e3] 2022-11-03 12:01:57 -0400
Branch: REL_14_STABLE [2489c38cd] 2022-11-03 12:01:57 -0400
Branch: REL_13_STABLE [b00f342ea] 2022-11-03 12:01:57 -0400
Branch: REL_12_STABLE [d9ffccf8d] 2022-11-03 12:01:57 -0400
Branch: REL_11_STABLE [ed019b5ef] 2022-11-03 12:01:57 -0400
Branch: REL_10_STABLE [5f3cec77b] 2022-11-03 12:01:57 -0400
-->
     <para>
      Avoid crash after function syntax error in replication workers
      (Maxim Orlov, Anton Melnikov, Masahiko Sawada, Tom Lane)
     </para>

     <para>
      If a syntax error occurred in a SQL-language or PL/pgSQL-language
      <command>CREATE FUNCTION</command> or <command>DO</command> command
      executed in a logical replication worker, the worker process would
      crash with a null pointer dereference or assertion failure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [309857f9c] 2022-08-10 13:37:25 -0400
Branch: REL_15_STABLE Release: REL_15_0 [ad3e07c15] 2022-08-10 13:37:25 -0400
Branch: REL_14_STABLE [95bfadd4e] 2022-08-10 13:37:25 -0400
Branch: REL_13_STABLE [71caf3c4d] 2022-08-10 13:37:25 -0400
Branch: REL_12_STABLE [5b948b5c1] 2022-08-10 13:37:25 -0400
Branch: REL_11_STABLE [442dbd669] 2022-08-10 13:37:25 -0400
Branch: REL_10_STABLE [1446612c5] 2022-08-10 13:37:25 -0400
-->
     <para>
      Fix handling of read-write expanded datums that are passed to SQL
      functions (Tom Lane)
     </para>

     <para>
      If a non-inlined SQL function uses a parameter in more than one
      place, and one of those functions expects to be able to modify
      read-write datums in place, then later uses of the parameter would
      observe the wrong value.  (Within
      core <productname>PostgreSQL</productname>, the expanded-datum
      mechanism is only used for array and composite-type values; but
      extensions might use it for other structured types.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [8cb2a22bb] 2022-09-12 12:59:06 +0200
Branch: REL_15_STABLE Release: REL_15_0 [56d238846] 2022-09-12 12:59:06 +0200
Branch: REL_14_STABLE [13b8a1c19] 2022-09-12 12:59:06 +0200
Branch: REL_13_STABLE [eb8b84807] 2022-09-12 12:59:06 +0200
Branch: REL_12_STABLE [9ebfbd23b] 2022-09-12 12:59:06 +0200
-->
     <para>
      Fix type <type>circle</type>'s equality comparator to handle NaNs
      properly (Ranier Vilela)
     </para>

     <para>
      If the left-hand circle had a floating-point NaN for its radius,
      it would be considered equal to a circle with the same center and
      any radius.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1058555a5] 2022-08-31 10:42:05 -0400
Branch: REL_15_STABLE Release: REL_15_0 [61f6e5c23] 2022-08-31 10:42:05 -0400
Branch: REL_14_STABLE [e969f1ae2] 2022-08-31 10:42:05 -0400
Branch: REL_13_STABLE [f204ad3a2] 2022-08-31 10:42:05 -0400
Branch: REL_12_STABLE [a53e0ea78] 2022-08-31 10:42:05 -0400
Branch: REL_11_STABLE [f5aa855cd] 2022-08-31 10:42:05 -0400
Branch: REL_10_STABLE [cba393a10] 2022-08-31 10:42:05 -0400
-->
     <para>
      In Snowball dictionaries, don't try to stem excessively-long words
      (Olly Betts, Tom Lane)
     </para>

     <para>
      If the input word exceeds 1000 bytes, return it as-is after case
      folding, rather than trying to run it through the Snowball code.
      This restriction protects against a known
      recursion-to-stack-overflow problem in the Turkish stemmer, and it
      seems like good insurance against any other safety or performance
      issues that may exist in the Snowball stemmers.  Such a long string
      is surely not a word in any human language, so it's doubtful that
      the stemmer would have done anything desirable with it anyway.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a46621942] 2022-08-14 12:05:27 -0400
Branch: REL_15_STABLE Release: REL_15_0 [9ae484121] 2022-08-14 12:05:27 -0400
Branch: REL_14_STABLE [06602372b] 2022-08-14 12:05:27 -0400
Branch: REL_13_STABLE [9fe285f85] 2022-08-14 12:05:27 -0400
Branch: REL_12_STABLE [ee8a2f9d7] 2022-08-14 12:05:27 -0400
Branch: REL_11_STABLE [84f9691a1] 2022-08-14 12:05:27 -0400
Branch: REL_10_STABLE [d3cf15dfc] 2022-08-14 12:05:27 -0400
-->
     <para>
      Fix use-after-free hazard in string comparisons (Tom Lane)
     </para>

     <para>
      Improper memory management in the string comparison functions
      could result in scribbling on no-longer-allocated buffers,
      potentially breaking things for whatever is using that memory
      now.  This would only happen with fairly long strings (more than
      1kB), and only if an ICU collation is in use.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [eec346611] 2022-10-17 11:35:23 -0400
Branch: REL_15_STABLE [2e3326929] 2022-10-17 11:35:23 -0400
Branch: REL_14_STABLE [8c611602b] 2022-10-17 11:35:23 -0400
Branch: REL_13_STABLE [62b263bf7] 2022-10-17 11:35:23 -0400
Branch: REL_12_STABLE [99b6b705d] 2022-10-17 11:35:23 -0400
-->
     <para>
      Add plan-time check for attempted access to a table that has no
      table access method (Tom Lane)
     </para>

     <para>
      This prevents a crash in some catalog-corruption scenarios, for
      example use of a view whose <literal>ON SELECT</literal> rule is
      missing.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [18a4a620e] 2022-10-11 18:54:31 -0400
Branch: REL_15_STABLE [e7b4ff327] 2022-10-11 18:54:31 -0400
Branch: REL_14_STABLE [b10546ecf] 2022-10-11 18:54:31 -0400
Branch: REL_13_STABLE [744270137] 2022-10-11 18:54:31 -0400
Branch: REL_12_STABLE [8f98352b5] 2022-10-11 18:54:31 -0400
Branch: REL_11_STABLE [6c1de98ba] 2022-10-11 18:54:31 -0400
Branch: REL_10_STABLE [ab35b9dd7] 2022-10-11 18:54:31 -0400
-->
     <para>
      Prevent postmaster crash when shared-memory state is corrupted
      (Tom Lane)
     </para>

     <para>
      The postmaster process is supposed to survive and initiate a
      database restart if shared memory becomes corrupted, but one
      bit of code was being insufficiently cautious about that.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f25bed380] 2022-08-24 13:02:19 -0400
Branch: REL_15_STABLE Release: REL_15_0 [3d3c05c70] 2022-08-24 13:02:19 -0400
Branch: REL_14_STABLE [444ec169a] 2022-08-24 13:01:40 -0400
Branch: REL_13_STABLE [2d1f1523c] 2022-08-24 13:01:40 -0400
Branch: REL_12_STABLE [599a487b0] 2022-08-24 13:01:40 -0400
Branch: REL_11_STABLE [310d734ef] 2022-08-24 13:01:40 -0400
Branch: REL_10_STABLE [f5157a9ac] 2022-08-24 13:01:40 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e07ebd4b6] 2022-08-13 15:21:28 -0400
Branch: REL_15_STABLE Release: REL_15_0 [00ac61695] 2022-08-13 15:21:28 -0400
Branch: REL_14_STABLE [496ab1d6c] 2022-08-13 15:21:28 -0400
Branch: REL_13_STABLE [60f876317] 2022-08-13 15:21:28 -0400
Branch: REL_12_STABLE [ba516fb07] 2022-08-13 15:21:28 -0400
Branch: REL_11_STABLE [b744e13b0] 2022-08-13 15:21:28 -0400
Branch: REL_10_STABLE [362032f17] 2022-08-13 15:21:28 -0400
-->
     <para>
      Add some more defenses against recursion till stack overrun
      (Richard Guo, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1c1294be7] 2022-08-31 16:23:35 -0400
Branch: REL_15_STABLE Release: REL_15_0 [0c599e748] 2022-08-31 16:23:20 -0400
Branch: REL_14_STABLE [feec1b2d5] 2022-08-31 16:23:20 -0400
Branch: REL_13_STABLE [45f7152b9] 2022-08-31 16:23:20 -0400
Branch: REL_12_STABLE [8fc6b9635] 2022-08-31 16:23:20 -0400
Branch: REL_11_STABLE [cb9232d16] 2022-08-31 16:23:20 -0400
Branch: REL_10_STABLE [fd640dbb8] 2022-08-31 16:23:20 -0400
-->
     <para>
      Avoid long-term memory leakage in the autovacuum launcher process
      (Reid Thompson)
     </para>

     <para>
      The lack of field reports suggests that this problem is only latent
      in pre-v15 branches; but it's not very clear why, so back-patch the
      fix anyway.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bfd6b3bc4] 2022-09-16 13:23:01 -0400
Branch: REL_15_STABLE Release: REL_15_0 [b759bb671] 2022-09-16 13:23:01 -0400
Branch: REL_14_STABLE [56d45fdab] 2022-09-16 13:23:01 -0400
Branch: REL_13_STABLE [c18d946e2] 2022-09-16 13:23:01 -0400
Branch: REL_12_STABLE [b3b88d748] 2022-09-16 13:23:01 -0400
Branch: REL_11_STABLE [7391ab28a] 2022-09-16 13:23:01 -0400
-->
     <para>
      Improve <application>PL/pgSQL</application>'s ability to handle
      parameters declared as <type>RECORD</type> (Tom Lane)
     </para>

     <para>
      Build a separate function cache entry for each concrete type passed
      to the <type>RECORD</type> parameter during a session, much as we do
      for polymorphic parameters.  This allows some usages to work that
      previously failed with errors such as <quote>type of parameter does
      not match that when preparing the plan</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bb9237a12] 2022-08-15 15:40:07 -0400
Branch: REL_15_STABLE Release: REL_15_0 [ef9f35964] 2022-08-15 15:40:07 -0400
Branch: REL_14_STABLE [d63a69157] 2022-08-15 15:40:07 -0400
Branch: REL_13_STABLE [e37e9a655] 2022-08-15 15:40:07 -0400
Branch: REL_12_STABLE [c19024d74] 2022-08-15 15:40:07 -0400
Branch: REL_11_STABLE [ee4a17e20] 2022-08-15 15:40:07 -0400
Branch: REL_10_STABLE [2a280832e] 2022-08-15 15:40:07 -0400
-->
     <para>
      Add missing guards for <literal>NULL</literal> connection pointer
      in <application>libpq</application> (Daniele Varrazzo, Tom Lane)
     </para>

     <para>
      There's a convention that <application>libpq</application> functions
      should check for a NULL PGconn argument, and fail gracefully instead
      of crashing.  <function>PQflush()</function>
      and <function>PQisnonblocking()</function> didn't get that memo, so
      fix them.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b7050e258] 2022-09-09 15:34:04 -0400
Branch: REL_15_STABLE Release: REL_15_0 [fbb54d742] 2022-09-09 15:34:04 -0400
Branch: REL_14_STABLE [be0b0528c] 2022-09-09 15:34:04 -0400
Branch: REL_13_STABLE [a6618842f] 2022-09-09 15:34:04 -0400
Branch: REL_12_STABLE [9fbc6d548] 2022-09-09 15:34:04 -0400
Branch: REL_11_STABLE [fe4e151d4] 2022-09-09 15:34:04 -0400
Branch: REL_10_STABLE [8fe26bca1] 2022-09-09 15:34:04 -0400
-->
     <para>
      In <application>ecpg</application>, fix omission of variable storage
      classes when multiple <type>varchar</type> or <type>bytea</type>
      variables are declared in the same declaration (Andrey Sokolov)
     </para>

     <para>
      For example, <application>ecpg</application>
      translated <literal>static varchar str1[10], str2[20],
      str3[30];</literal> in such a way that only <varname>str1</varname>
      was marked <literal>static</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [1f0c4fa25] 2022-10-21 08:21:55 -0400
Branch: REL_15_STABLE [5c013e620] 2022-10-21 08:31:39 -0400
Branch: REL_14_STABLE [aaad8adb0] 2022-10-21 08:39:48 -0400
Branch: REL_13_STABLE [0bf2cd160] 2022-10-21 08:45:08 -0400
Branch: REL_12_STABLE [475e9daf3] 2022-10-21 08:59:26 -0400
Branch: REL_11_STABLE [38214dabd] 2022-10-21 09:05:57 -0400
Branch: REL_10_STABLE [ba58266eb] 2022-10-21 09:11:47 -0400
-->
     <para>
      Allow cross-platform tablespace relocation
      in <application>pg_basebackup</application> (Robert Haas)
     </para>

     <para>
      Allow the remote path in <option>--tablespace-mapping</option> to be
      either a Unix-style or Windows-style absolute path, since the source
      server could be on a different OS than the local system.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [495e73c20] 2022-11-01 12:48:01 -0400
Branch: REL_15_STABLE [8b0a5cf3f] 2022-11-01 12:48:01 -0400
Branch: REL_14_STABLE [0f2f5645a] 2022-11-01 12:48:01 -0400
Branch: REL_13_STABLE [a9fdb48b7] 2022-11-01 12:48:01 -0400
Branch: REL_12_STABLE [ca4c6764b] 2022-11-01 12:48:01 -0400
Branch: REL_11_STABLE [149e00192] 2022-11-01 12:48:01 -0400
Branch: REL_10_STABLE [56083ff30] 2022-11-01 12:48:01 -0400
-->
     <para>
      In <application>pg_stat_statements</application>, fix access to
      already-freed memory (zhaoqigui)
     </para>

     <para>
      This occurred if <application>pg_stat_statements</application>
      tracked a <command>ROLLBACK</command> command issued via extended
      query protocol.  In debug builds it consistently led to an assertion
      failure.  In production builds there would often be no visible ill
      effect; but if the freed memory had already been reused, the likely
      result would be to store garbage for the query string.
     </para>
    </listitem>

    <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
Branch: master [9320cfdd0] 2022-09-14 18:45:00 +0900
Branch: REL_15_STABLE Release: REL_15_0 [64387c540] 2022-09-14 18:45:01 +0900
Branch: REL_14_STABLE [b53d104ae] 2022-09-14 18:45:03 +0900
Branch: REL_13_STABLE [6749d4e8c] 2022-09-14 18:45:04 +0900
Branch: REL_12_STABLE [87fd3c902] 2022-09-14 18:45:06 +0900
Branch: REL_11_STABLE [07d81d1e5] 2022-09-14 18:45:07 +0900
Branch: REL_10_STABLE [d4adff0e9] 2022-09-14 18:45:09 +0900
-->
     <para>
      In <application>postgres_fdw</application>, ensure that target lists
      constructed for EvalPlanQual plans will have all required columns
      (Richard Guo, Etsuro Fujita)
     </para>

     <para>
      This avoids <quote>variable not found in subplan target list</quote>
      errors in rare cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c4b6d218e] 2022-09-09 12:41:36 -0400
Branch: REL_15_STABLE Release: REL_15_0 [100a8ca2c] 2022-09-09 12:41:36 -0400
Branch: REL_14_STABLE [e55ccb3b1] 2022-09-09 12:41:36 -0400
Branch: REL_13_STABLE [a61095aa7] 2022-09-09 12:41:36 -0400
Branch: REL_12_STABLE [23fe89a61] 2022-09-09 12:41:36 -0400
Branch: REL_11_STABLE [4d3f54bd7] 2022-09-09 12:41:36 -0400
Branch: REL_10_STABLE [95028d9de] 2022-09-09 12:41:36 -0400
-->
     <para>
      Reject unwanted output from the platform's
      <function>uuid_create()</function> function (Nazir Bilal Yavuz)
     </para>

     <para>
      The <application>uuid-ossp</application> module expects
      libc's <function>uuid_create()</function> to produce a version-1
      UUID, but recent NetBSD releases produce a version-4 (random) UUID
      instead.  Check for that, and complain if so.  Drop the
      documentation's claim that the NetBSD implementation is usable
      for <application>uuid-ossp</application>.
      (If a version-4 UUID is okay for your purposes, you don't
      need <application>uuid-ossp</application> at all; just
      use <function>gen_random_uuid()</function>.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL_14_STABLE [4f6d1cfd6] 2022-10-11 09:56:13 +0200
Branch: REL_13_STABLE [33d979aee] 2022-10-11 09:56:13 +0200
Branch: REL_12_STABLE [fa5c13178] 2022-10-11 09:56:13 +0200
Branch: REL_11_STABLE [dd8263873] 2022-10-11 09:56:13 +0200
Branch: REL_10_STABLE [8bf470527] 2022-10-11 09:56:13 +0200
-->
     <para>
      Include new Perl test modules in standard installations
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      Add <filename>PostgreSQL/Test/Cluster.pm</filename> and
      <filename>PostgreSQL/Test/Utils.pm</filename> to the standard
      installation file set in pre-version-15 branches.  This is for the
      benefit of extensions that want to use newly-written test code in
      older branches.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8acd8f869] 2022-08-30 17:28:37 -0400
Branch: REL_15_STABLE Release: REL_15_0 [529d8f373] 2022-08-30 17:28:55 -0400
Branch: REL_14_STABLE [464db4676] 2022-08-30 17:29:03 -0400
Branch: REL_13_STABLE [a94b019d4] 2022-08-30 17:29:08 -0400
Branch: REL_12_STABLE [68bfe36c5] 2022-08-30 17:29:13 -0400
Branch: REL_11_STABLE [6fd58ca77] 2022-08-30 17:29:17 -0400
Branch: REL_10_STABLE [5bed28e69] 2022-08-30 17:29:23 -0400
-->
     <para>
      On NetBSD, force dynamic symbol resolution at postmaster start
      (Andres Freund, Tom Lane)
     </para>

     <para>
      This avoids a risk of deadlock in the dynamic linker on NetBSD 10.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [c2ae01f69] 2022-10-19 22:18:26 +1300
Branch: REL_15_STABLE [af64846e1] 2022-10-19 22:18:54 +1300
Branch: REL_14_STABLE [d033f8f8b] 2022-10-19 22:32:14 +1300
Branch: REL_13_STABLE [cf94cb586] 2022-10-19 22:38:58 +1300
Branch: REL_12_STABLE [aa34bc4e2] 2022-10-19 22:44:53 +1300
Branch: REL_11_STABLE [da3a6825e] 2022-10-19 22:49:25 +1300
-->
     <para>
      Fix incompatibilities with LLVM 15 (Thomas Munro, Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1c72d82c2] 2022-11-02 17:37:29 -0400
Branch: REL_15_STABLE [a5737e765] 2022-11-02 17:37:26 -0400
Branch: REL_14_STABLE [058c7b5dd] 2022-11-02 17:37:26 -0400
Branch: REL_13_STABLE [c479492c0] 2022-11-02 17:37:26 -0400
Branch: REL_12_STABLE [5ecf836e9] 2022-11-02 17:37:26 -0400
Branch: REL_11_STABLE [a0f9be1f9] 2022-11-02 17:37:26 -0400
Branch: REL_10_STABLE [19cefebe7] 2022-11-02 17:37:26 -0400
-->
     <para>
      Allow use of <function>__sync_lock_test_and_set()</function> for
      spinlocks on any machine (Tom Lane)
     </para>

     <para>
      This eases porting to new machine architectures, at least if you're
      using a compiler that supports this GCC builtin function.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [717ec1aae] 2022-10-16 15:27:04 -0400
Branch: REL_15_STABLE [24c4c2617] 2022-10-16 15:27:04 -0400
Branch: REL_14_STABLE [18e60712d] 2022-10-16 15:27:04 -0400
Branch: REL_13_STABLE [bc7a40b42] 2022-10-16 15:27:04 -0400
Branch: REL_12_STABLE [3d7df87c4] 2022-10-16 15:27:04 -0400
Branch: REL_11_STABLE [6618c276b] 2022-10-16 15:27:04 -0400
Branch: REL_10_STABLE [02d074e3e] 2022-10-16 15:27:04 -0400
Branch: REL9_6_STABLE [9bfa043a1] 2022-10-16 15:27:04 -0400
Branch: REL9_5_STABLE [377b37cf7] 2022-10-16 15:27:04 -0400
Branch: REL9_4_STABLE [57dfb6ce6] 2022-10-16 15:27:04 -0400
Branch: REL9_3_STABLE [ee4c44014] 2022-10-16 15:27:04 -0400
Branch: REL9_2_STABLE [fec443414] 2022-10-16 15:27:04 -0400
-->
     <para>
      Rename symbol <literal>REF</literal> to <literal>REF_P</literal> to
      avoid compile failure on recent macOS (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [450ee7012] 2022-10-16 11:47:44 -0400
Branch: REL_15_STABLE [bd4b2926e] 2022-10-16 11:47:44 -0400
Branch: REL_14_STABLE [6fa431d84] 2022-10-16 11:47:44 -0400
Branch: REL_13_STABLE [a2acafc7b] 2022-10-16 11:47:44 -0400
Branch: REL_12_STABLE [d33ac1ec2] 2022-10-16 11:47:44 -0400
-->
     <para>
      Avoid using <function>sprintf</function>, to avoid compile-time
      deprecation warnings (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_15_STABLE Release: REL_15_0 [f9a56e726] 2022-09-20 18:59:53 -0400
Branch: REL_14_STABLE [dcd7dbed5] 2022-09-20 18:59:53 -0400
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Branch: REL9_2_STABLE [5d3ce0d82] 2022-09-20 18:59:54 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [152c9f7b8] 2022-09-20 12:04:37 -0400
Branch: REL_15_STABLE Release: REL_15_0 [b7d9b0c26] 2022-09-20 12:04:37 -0400
Branch: REL_14_STABLE [2e124d857] 2022-09-20 12:04:37 -0400
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Branch: REL_12_STABLE [f38a0bde2] 2022-09-20 12:04:37 -0400
Branch: REL_11_STABLE [6ae8aee0b] 2022-09-20 12:04:37 -0400
Branch: REL_10_STABLE [760308704] 2022-09-20 12:04:37 -0400
Branch: REL9_6_STABLE [85c077f9e] 2022-09-20 12:04:37 -0400
Branch: REL9_5_STABLE [612e79661] 2022-09-20 12:04:37 -0400
Branch: REL_14_STABLE [88c947cb5] 2022-09-21 13:52:38 -0400
Branch: REL_13_STABLE [db8e36682] 2022-09-21 13:52:38 -0400
Branch: REL_12_STABLE [9a2267bcf] 2022-09-21 13:52:38 -0400
Branch: REL_11_STABLE [bb8dbc9f2] 2022-09-21 13:52:38 -0400
Branch: REL_10_STABLE [9c69e2640] 2022-09-21 13:52:38 -0400
Branch: REL9_6_STABLE [c705646b7] 2022-09-21 13:52:38 -0400
Branch: REL9_5_STABLE [96e595124] 2022-09-21 13:52:38 -0400
Branch: REL9_4_STABLE [3c5a33a52] 2022-09-21 13:52:38 -0400
Branch: REL9_3_STABLE [bf2161234] 2022-09-21 13:52:38 -0400
Branch: REL9_2_STABLE [850cb88e4] 2022-09-21 13:52:38 -0400
-->
     <para>
      Silence assorted compiler warnings from clang 15 and later (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e7c7605a7] 2022-11-01 17:08:28 -0400
Branch: REL_15_STABLE [c3d16eb3d] 2022-11-01 17:08:49 -0400
Branch: REL_14_STABLE [97bb80b1b] 2022-11-01 17:08:58 -0400
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Branch: REL_11_STABLE [b1cb77bdf] 2022-11-01 17:09:16 -0400
Branch: REL_10_STABLE [b3326a753] 2022-11-01 17:09:21 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2022f for DST law changes in Chile, Fiji, Iran, Jordan,
      Mexico, Palestine, and Syria, plus historical corrections for Chile,
      Crimea, Iran, and Mexico.
     </para>

     <para>
      Also, the Europe/Kiev zone has been renamed to Europe/Kyiv.
      Also, the following zones have been merged into nearby,
      more-populous zones whose clocks have agreed with them since 1970:
      Antarctica/Vostok, Asia/Brunei,
      Asia/Kuala_Lumpur, Atlantic/Reykjavik, Europe/Amsterdam,
      Europe/Copenhagen, Europe/Luxembourg, Europe/Monaco, Europe/Oslo,
      Europe/Stockholm, Indian/Christmas, Indian/Cocos, Indian/Kerguelen,
      Indian/Mahe, Indian/Reunion, Pacific/Chuuk, Pacific/Funafuti,
      Pacific/Majuro, Pacific/Pohnpei, Pacific/Wake and Pacific/Wallis.
      (This indirectly affects zones that were already links to one of
      these: Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland,
      Pacific/Ponape, Pacific/Truk, and Pacific/Yap.)  America/Nipigon,
      America/Rainy_River, America/Thunder_Bay, Europe/Uzhgorod, and
      Europe/Zaporozhye were also merged into nearby zones after
      discovering that their claimed post-1970 differences from those
      zones seem to have been errors.
      In all these cases, the previous zone name remains as an alias;
      but the actual data is that of the zone that was merged into.
     </para>

     <para>
      These zone mergers result in loss of pre-1970 timezone history for
      the merged zones, which may be troublesome for applications
      expecting consistency of <type>timestamptz</type> display.  As an
      example, the stored value <literal>1944-06-01 12:00 UTC</literal>
      would previously display as <literal>1944-06-01
      13:00:00+01</literal> if the Europe/Stockholm zone is selected, but
      now it will read out as <literal>1944-06-01 14:00:00+02</literal>.
     </para>

     <para>
      It is possible to build the time zone data files with options that
      will restore the older zone data, but that choice also inserts a lot
      of other old (and typically poorly-attested) zone data, resulting in
      more total changes from the previous release than accepting these
      upstream changes does.  <productname>PostgreSQL</productname> has
      chosen to ship the <productname>tzdb</productname> data
      as-recommended, and so far as we are aware most major operating
      system distributions are doing likewise.  However, if these changes
      cause significant problems for your application, a possible solution
      is to install a local build of the time zone data files using
      <productname>tzdb</productname>'s backwards-compatibility options
      (see their <literal>PACKRATDATA</literal>
      and <literal>PACKRATLIST</literal> options).
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-12">
  <title>Release 12.12</title>

  <formalpara>
  <title>Release date:</title>
  <para>2022-08-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.11.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.12</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.10,
    see <xref linkend="release-12-10"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b9b21acc7] 2022-08-08 11:12:31 -0400
Branch: REL_15_STABLE [cc7e0feba] 2022-08-08 11:12:31 -0400
Branch: REL_14_STABLE [5721da7e4] 2022-08-08 11:12:31 -0400
Branch: REL_13_STABLE [7e92f78ab] 2022-08-08 11:12:31 -0400
Branch: REL_12_STABLE [5579726bd] 2022-08-08 11:12:31 -0400
Branch: REL_11_STABLE [f52d2fbd8] 2022-08-08 11:12:31 -0400
Branch: REL_10_STABLE [5919bb5a5] 2022-08-08 11:12:31 -0400
-->
     <para>
      Do not let extension scripts replace objects not already belonging
      to the extension (Tom Lane)
     </para>

     <para>
      This change prevents extension scripts from doing <command>CREATE
      OR REPLACE</command> if there is an existing object that does not
      belong to the extension.  It also prevents <command>CREATE IF NOT
      EXISTS</command> in the same situation.  This prevents a form of
      trojan-horse attack in which a hostile database user could become
      the owner of an extension object and then modify it to compromise
      future uses of the object by other users.  As a side benefit, it
      also reduces the risk of accidentally replacing objects one did
      not mean to.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Sven Klemm for reporting this problem.
      (CVE-2022-2625)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [9e4f914b5] 2022-07-28 08:40:06 +0200
Branch: REL_15_STABLE [8348413db] 2022-07-28 08:26:05 +0200
Branch: REL_14_STABLE [a3aacb7cb] 2022-07-28 08:26:05 +0200
Branch: REL_13_STABLE [9a7e26b9c] 2022-07-28 08:26:05 +0200
Branch: REL_12_STABLE [6d20f8c5a] 2022-07-28 08:26:05 +0200
Branch: REL_11_STABLE [5a10c262f] 2022-07-28 08:26:05 +0200
Branch: REL_10_STABLE [084318c33] 2022-07-28 08:26:05 +0200
Branch: master [59be1c942] 2022-07-29 12:50:47 +0200
Branch: REL_15_STABLE [798d64488] 2022-07-29 12:50:47 +0200
Branch: REL_14_STABLE [4d8d85740] 2022-07-29 12:50:47 +0200
Branch: REL_13_STABLE [7cfe688de] 2022-07-29 12:50:47 +0200
Branch: REL_12_STABLE [658e5d534] 2022-07-29 12:50:47 +0200
Branch: REL_11_STABLE [fcd72cf29] 2022-07-29 12:50:47 +0200
Branch: REL_10_STABLE [6ffaf75a8] 2022-07-29 12:50:47 +0200
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [b998196bb] 2022-07-29 17:54:19 -0400
Branch: REL_15_STABLE [2eb3f167f] 2022-07-29 18:17:17 -0400
Branch: REL_14_STABLE [e90c4fc88] 2022-07-29 18:17:30 -0400
Branch: REL_13_STABLE [b76e136ce] 2022-07-29 18:17:36 -0400
Branch: REL_12_STABLE [4349a7615] 2022-07-29 18:17:42 -0400
Branch: REL_11_STABLE [3f9c20536] 2022-07-29 18:17:49 -0400
Branch: REL_10_STABLE [c308003d2] 2022-07-29 18:17:55 -0400
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [6c1c9f88a] 2022-08-06 15:52:10 +0200
Branch: REL_15_STABLE [6390bc740] 2022-08-06 15:52:10 +0200
Branch: REL_14_STABLE [9d5c96d9b] 2022-08-06 15:52:10 +0200
Branch: REL_13_STABLE [8c5d9ccca] 2022-08-06 15:52:10 +0200
Branch: REL_12_STABLE [782e5631e] 2022-08-06 15:52:10 +0200
Branch: REL_11_STABLE [772e6383d] 2022-08-06 15:52:10 +0200
Branch: REL_10_STABLE [ad0e08394] 2022-08-06 15:52:10 +0200
-->
     <para>
      Fix replay of <command>CREATE DATABASE</command> WAL
      records on standby servers
      (Kyotaro Horiguchi, Asim R Praveen, Paul Guo)
     </para>

     <para>
      Standby servers may encounter missing tablespace directories
      when replaying database-creation WAL records.  Prior to this
      patch, a standby would fail to recover in such a case;
      however, such directories could be legitimately missing.
      Create the tablespace (as a plain directory), then check that it
      has been dropped again once replay reaches a consistent state.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL_14_STABLE [961cab0a5] 2022-07-27 07:55:13 +0200
Branch: REL_13_STABLE [16e7a8fd8] 2022-07-27 07:55:13 +0200
Branch: REL_12_STABLE [ca347f543] 2022-07-27 07:55:12 +0200
Branch: REL_11_STABLE [258c89641] 2022-07-27 07:55:12 +0200
Branch: REL_10_STABLE [7bdbbb873] 2022-07-27 07:55:12 +0200
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [9d3444dcc] 2022-07-22 16:57:12 +1200
Branch: REL_15_STABLE [6d306ab73] 2022-07-22 16:57:36 +1200
Branch: REL_14_STABLE [fee0165fc] 2022-07-22 16:57:57 +1200
Branch: master [4fc6b6eef] 2022-07-28 14:26:12 +1200
Branch: REL_15_STABLE [fc4e5af30] 2022-07-28 14:27:28 +1200
Branch: REL_14_STABLE [5ad478c9d] 2022-07-28 14:27:06 +1200
-->
     <para>
      Support <quote>in place</quote> tablespaces
      (Thomas Munro, Michael Paquier, &Aacute;lvaro Herrera)
     </para>

     <para>
      Normally a Postgres tablespace is a symbolic link to a directory on
      some other filesystem.  This change allows it to just be a plain
      directory.  While this has no use for separating tables onto
      different filesystems, it is a convenient setup for testing.
      Moreover, it is necessary to support the <command>CREATE
      DATABASE</command> replay fix, which transiently creates a missing
      tablespace as an <quote>in place</quote> tablespace.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master Release: REL_15_BR [00377b9a0] 2022-06-25 09:07:41 -0700
Branch: REL_14_STABLE [ace997386] 2022-06-25 09:07:44 -0700
Branch: REL_13_STABLE [8782ce49e] 2022-06-25 09:07:45 -0700
Branch: REL_12_STABLE [93731d549] 2022-06-25 09:07:45 -0700
Branch: REL_11_STABLE [6d49cc286] 2022-06-25 09:07:46 -0700
Branch: REL_10_STABLE [88b39e614] 2022-06-25 09:07:46 -0700
-->
     <para>
      Fix permissions checks in <command>CREATE INDEX</command> (Nathan
      Bossart, Noah Misch)
     </para>

     <para>
      The fix for CVE-2022-1552 caused <command>CREATE INDEX</command> to
      apply the table owner's permissions while performing lookups of
      operator classes and other objects, where formerly the calling
      user's permissions were used.  This broke dump/restore scenarios,
      because <application>pg_dump</application> issues <command>CREATE
      INDEX</command> before re-granting permissions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f92944137] 2022-07-26 13:07:03 -0400
Branch: REL_15_STABLE [a0c632c1d] 2022-07-26 13:07:03 -0400
Branch: REL_14_STABLE [3e1297a63] 2022-07-26 13:07:03 -0400
Branch: REL_13_STABLE [6c193c2ac] 2022-07-26 13:07:03 -0400
Branch: REL_12_STABLE [968b89257] 2022-07-26 13:07:03 -0400
Branch: REL_11_STABLE [9e3e1ac45] 2022-07-26 13:07:03 -0400
Branch: REL_10_STABLE [964f42aa2] 2022-07-26 13:07:03 -0400
-->
     <para>
      In extended query protocol, force an immediate commit
      after <command>CREATE DATABASE</command> and other commands that
      can't run in a transaction block (Tom Lane)
     </para>

     <para>
      If the client does not send a Sync message immediately after such a
      command, but instead sends another command, any failure in that
      command would lead to rolling back the preceding command, typically
      leaving inconsistent state on-disk (such as a missing or extra
      database directory).  The mechanisms intended to prevent that
      situation turn out to work for multiple commands in a simple-Query
      message, but not for a series of extended-protocol messages.  To
      prevent inconsistency without breaking use-cases that work today,
      force an implicit commit after such commands.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master Release: REL_15_BR [adf6d5dfb] 2022-06-27 08:21:08 +0300
Branch: REL_14_STABLE [e24615a00] 2022-06-27 08:24:30 +0300
Branch: REL_13_STABLE [7ba325fd7] 2022-06-27 08:24:35 +0300
Branch: REL_12_STABLE [af530898e] 2022-06-27 08:24:36 +0300
Branch: REL_11_STABLE [b49889f3c] 2022-06-27 08:24:37 +0300
Branch: REL_10_STABLE [4822b4627] 2022-06-27 08:24:38 +0300
-->
     <para>
      Fix race condition when checking transaction visibility (Simon Riggs)
     </para>

     <para>
      <function>TransactionIdIsInProgress</function> could
      report <literal>false</literal> before the subject transaction is
      considered visible, leading to various misbehaviors.  The race
      condition window is normally very narrow, but use of synchronous
      replication makes it much wider, because the wait for a synchronous
      replica happens in that window.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [1218780cc] 2022-06-10 10:35:57 -0400
Branch: REL_14_STABLE Release: REL_14_4 [77c1d92cb] 2022-06-10 10:35:57 -0400
Branch: REL_13_STABLE [254cd7f31] 2022-06-10 10:35:57 -0400
Branch: REL_12_STABLE [d3ef5c3ef] 2022-06-10 10:35:57 -0400
Branch: REL_11_STABLE [199aac8b2] 2022-06-10 10:35:57 -0400
-->
     <para>
      Fix queries in which a <quote>whole-row variable</quote> references
      the result of a function that returns a domain over composite type
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [79b58c6f6] 2022-05-12 11:31:46 -0400
Branch: REL_14_STABLE Release: REL_14_4 [ac51c9fba] 2022-05-12 11:31:46 -0400
Branch: REL_13_STABLE [b7579b25c] 2022-05-12 11:31:46 -0400
Branch: REL_12_STABLE [301b91c56] 2022-05-12 11:31:46 -0400
Branch: REL_11_STABLE [7f7f1750d] 2022-05-12 11:31:46 -0400
Branch: REL_10_STABLE [b53442f6f] 2022-05-12 11:31:46 -0400
-->
     <para>
      Fix <quote>variable not found in subplan target list</quote> planner
      error when pulling up a sub-<literal>SELECT</literal> that's
      referenced in a <literal>GROUPING</literal> function (Richard Guo)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [ec0925c22] 2022-08-05 09:47:26 +0200
Branch: REL_15_STABLE [e78fd9084] 2022-08-05 09:47:15 +0200
Branch: REL_14_STABLE [731d514ae] 2022-08-05 09:47:11 +0200
Branch: REL_13_STABLE [ab8556630] 2022-08-05 09:47:06 +0200
Branch: REL_12_STABLE [6e7b37264] 2022-08-05 09:47:02 +0200
Branch: REL_11_STABLE [ce8e06652] 2022-08-05 09:46:58 +0200
Branch: master [90a4b6413] 2022-08-05 11:55:52 +0200
Branch: REL_15_STABLE [aa242501a] 2022-08-05 11:55:52 +0200
Branch: REL_14_STABLE [6d9481cd0] 2022-08-05 11:55:52 +0200
Branch: REL_13_STABLE [d2a74621e] 2022-08-05 11:55:52 +0200
Branch: REL_12_STABLE [4ad4c1f41] 2022-08-05 11:55:52 +0200
Branch: REL_11_STABLE [91130dd31] 2022-08-05 11:55:52 +0200
-->
     <para>
      Fix <literal>ALTER TABLE ... ENABLE/DISABLE TRIGGER</literal> to
      handle recursion correctly for triggers on partitioned tables
      (&Aacute;lvaro Herrera, Amit Langote)
     </para>

     <para>
      In certain cases, a <quote>trigger does not exist</quote> failure
      would occur because the command would try to adjust the trigger on a
      child partition that doesn't have it.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [89a39d4a4] 2022-07-03 17:08:25 -0400
Branch: REL_15_STABLE [7d9bf589b] 2022-07-03 17:27:03 -0400
Branch: REL_14_STABLE [7fd43684f] 2022-07-03 17:16:11 -0400
Branch: REL_13_STABLE [03cefe814] 2022-07-03 17:16:58 -0400
Branch: REL_12_STABLE [2cf875a4b] 2022-07-03 17:17:08 -0400
-->
     <para>
      Improve syntax error messages for type <type>jsonpath</type>
      (Andrew Dunstan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [bf4717b09] 2022-06-07 15:34:30 -0400
Branch: REL_14_STABLE Release: REL_14_4 [5c3b5f7db] 2022-06-07 15:34:30 -0400
Branch: REL_13_STABLE [a36196972] 2022-06-07 15:34:30 -0400
Branch: REL_12_STABLE [435251b85] 2022-06-07 15:34:30 -0400
Branch: REL_11_STABLE [d628ce048] 2022-06-07 15:34:30 -0400
Branch: REL_10_STABLE [fb646cbd5] 2022-06-07 15:34:30 -0400
-->
     <para>
      Prevent <function>pg_stat_get_subscription()</function> from
      possibly returning an extra row containing garbage values
      (Kuntal Ghosh)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [b24b2be11] 2022-07-20 09:57:01 +0900
Branch: REL_15_STABLE [0829cc43e] 2022-07-20 09:57:07 +0900
Branch: REL_14_STABLE [be2e842c8] 2022-07-20 09:53:37 +0900
Branch: REL_13_STABLE [162ade612] 2022-07-20 09:53:53 +0900
Branch: REL_12_STABLE [f0eb83f81] 2022-07-20 09:54:03 +0900
Branch: REL_11_STABLE [80c3ea918] 2022-07-20 09:54:10 +0900
Branch: REL_10_STABLE [2497d2b77] 2022-07-20 09:54:24 +0900
-->
     <para>
      Ensure that <function>pg_stop_backup()</function> cleans up session
      state properly (Fujii Masao)
     </para>

     <para>
      This omission could lead to assertion failures or crashes later in
      the session.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [8d367a44d] 2022-07-07 13:08:08 +0100
Branch: REL_15_STABLE [ea9e59d70] 2022-07-07 13:08:06 +0100
Branch: REL_14_STABLE [8d8464445] 2022-07-07 13:08:03 +0100
Branch: REL_13_STABLE [f890223bc] 2022-07-07 13:08:00 +0100
Branch: REL_12_STABLE [f9c655d64] 2022-07-07 13:07:57 +0100
Branch: REL_11_STABLE [e88b1f1e2] 2022-07-07 13:07:54 +0100
Branch: REL_10_STABLE [8ace122d4] 2022-07-07 13:07:51 +0100
-->
     <para>
      Fix join alias matching in <literal>FOR [KEY] UPDATE/SHARE</literal>
      clauses (Dean Rasheed)
     </para>

     <para>
      In corner cases, a misleading error could be reported.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master Release: REL_15_BR [0fbf01120] 2022-05-18 20:28:31 +0200
Branch: REL_14_STABLE Release: REL_14_4 [94edb85d2] 2022-05-18 20:28:31 +0200
Branch: REL_13_STABLE [80656f00f] 2022-05-18 20:28:31 +0200
Branch: REL_12_STABLE [ade17703d] 2022-05-18 20:28:31 +0200
Branch: REL_11_STABLE [ba83de8ad] 2022-05-18 20:28:31 +0200
Branch: REL_10_STABLE [16cb7db34] 2022-05-18 20:28:31 +0200
Branch: master Release: REL_15_BR [62221ef18] 2022-05-18 23:19:53 +0200
Branch: REL_14_STABLE Release: REL_14_4 [e8b93c6e2] 2022-05-18 23:19:53 +0200
Branch: REL_13_STABLE [5139db556] 2022-05-18 23:19:53 +0200
Branch: REL_12_STABLE [0ebd20e20] 2022-05-18 23:19:53 +0200
Branch: REL_11_STABLE [50bf3157a] 2022-05-18 23:19:53 +0200
Branch: REL_10_STABLE [29d111518] 2022-05-18 23:19:53 +0200
-->
     <para>
      Avoid crashing if too many column aliases are attached to
      an <literal>XMLTABLE</literal> or <literal>JSON_TABLE</literal>
      construct (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [fd96d14d9] 2022-07-29 13:31:10 -0400
Branch: REL_15_STABLE [e6e804aa2] 2022-07-29 13:31:11 -0400
Branch: REL_14_STABLE [8df167baa] 2022-07-29 13:30:50 -0400
Branch: REL_13_STABLE [ba2002d02] 2022-07-29 13:30:50 -0400
Branch: REL_12_STABLE [d79f00e82] 2022-07-29 13:30:50 -0400
Branch: REL_11_STABLE [8dea18372] 2022-07-29 13:30:50 -0400
Branch: REL_10_STABLE [e6a48014d] 2022-07-29 13:30:50 -0400
Branch: master [83f1793d6] 2022-08-01 12:22:35 -0400
Branch: REL_15_STABLE [adc3ae6eb] 2022-08-01 12:22:35 -0400
Branch: REL_14_STABLE [d947a8bd5] 2022-08-01 12:22:35 -0400
Branch: REL_13_STABLE [331f8b851] 2022-08-01 12:22:35 -0400
Branch: REL_12_STABLE [5d280bc89] 2022-08-01 12:22:35 -0400
Branch: REL_11_STABLE [51d8b52fc] 2022-08-01 12:22:35 -0400
Branch: REL_10_STABLE [d54fc7e67] 2022-08-01 12:22:35 -0400
-->
     <para>
      Reject <literal>ROW()</literal> expressions and functions
      in <literal>FROM</literal> that have too many columns (Tom Lane)
     </para>

     <para>
      Cases with more than about 1600 columns are unsupported, and
      have always failed at execution.  However, it emerges that some
      earlier code could be driven to assertion failures or crashes by
      queries with more than 32K columns.  Add a parse-time check to
      prevent that.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [c7461fc25] 2022-05-21 14:45:58 -0400
Branch: REL_14_STABLE Release: REL_14_4 [6f7eec119] 2022-05-21 14:45:58 -0400
Branch: REL_13_STABLE [fefd54631] 2022-05-21 14:45:58 -0400
Branch: REL_12_STABLE [bb2c04676] 2022-05-21 14:45:58 -0400
Branch: REL_11_STABLE [f3b8d7244] 2022-05-21 14:45:58 -0400
Branch: REL_10_STABLE [7686403b4] 2022-05-21 14:45:58 -0400
-->
     <para>
      When decompiling a view or rule, show a <command>SELECT</command>
      output column's <literal>AS "?column?"</literal> alias clause
      if it could be referenced elsewhere (Tom Lane)
     </para>

     <para>
      Previously, this auto-generated alias was always hidden; but there
      are corner cases where doing so results in a non-restorable view or
      rule definition.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b9654cece] 2022-07-21 13:56:02 -0400
Branch: REL_15_STABLE [c1d1e8469] 2022-07-21 13:56:05 -0400
Branch: REL_14_STABLE [da9a28fd5] 2022-07-21 13:56:02 -0400
Branch: REL_13_STABLE [5b5d43513] 2022-07-21 13:56:02 -0400
Branch: REL_12_STABLE [b243092a6] 2022-07-21 13:56:02 -0400
Branch: REL_11_STABLE [1078742af] 2022-07-21 13:56:02 -0400
Branch: REL_10_STABLE [6bceacfe8] 2022-07-21 13:56:02 -0400
-->
     <para>
      Fix dumping of a view using a function in <literal>FROM</literal>
      that returns a composite type, when column(s) of the composite type
      have been dropped since the view was made (Tom Lane)
     </para>

     <para>
      This oversight could lead to dump/reload
      or <application>pg_upgrade</application> failures, as the dumped
      view would have too many column aliases for the function.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master Release: REL_15_BR [602986191] 2022-05-20 18:52:55 +0200
Branch: REL_14_STABLE Release: REL_14_4 [58b088a9b] 2022-05-20 18:52:55 +0200
Branch: REL_13_STABLE [3753a169e] 2022-05-20 18:52:55 +0200
Branch: REL_12_STABLE [4492e73a6] 2022-05-20 18:52:55 +0200
Branch: REL_11_STABLE [6c6ea6ea8] 2022-05-20 18:52:55 +0200
Branch: REL_10_STABLE [70f70d7d3] 2022-05-20 18:52:55 +0200
Branch: REL_10_STABLE [8c47622bb] 2022-05-20 19:05:55 +0200
-->
     <para>
      Report implicitly-created operator families to event triggers
      (Masahiko Sawada)
     </para>

     <para>
      If <command>CREATE OPERATOR CLASS</command> results in the implicit
      creation of an operator family, that object was not reported to
      event triggers that should capture such events.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: REL_14_STABLE Release: REL_14_4 [6dced63b4] 2022-05-16 11:26:22 +0900
Branch: REL_13_STABLE [2e9559b30] 2022-05-16 11:26:26 +0900
Branch: REL_12_STABLE [7e59b1219] 2022-05-16 11:26:30 +0900
Branch: REL_11_STABLE [4525151d4] 2022-05-16 11:26:36 +0900
Branch: REL_10_STABLE [60e956eb8] 2022-05-16 11:26:41 +0900
-->
     <para>
      Fix control file updates made when a restartpoint is running during
      promotion of a standby server (Kyotaro Horiguchi)
     </para>

     <para>
      Previously, when the restartpoint completed it could incorrectly
      update the last-checkpoint fields of the control file, potentially
      leading to PANIC and failure to restart if the server crashes before
      the next normal checkpoint completes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master Release: REL_15_BR [f95d53ede] 2022-05-11 11:11:44 +0530
Branch: REL_14_STABLE Release: REL_14_4 [d6da71fa8] 2022-05-11 10:51:04 +0530
Branch: REL_13_STABLE [55558df23] 2022-05-11 10:41:24 +0530
Branch: REL_12_STABLE [f832b5007] 2022-05-11 10:25:56 +0530
Branch: REL_11_STABLE [87c1dd246] 2022-05-11 10:12:23 +0530
Branch: REL_10_STABLE [a4015ec03] 2022-05-11 10:01:35 +0530
-->
     <para>
      Prevent triggering of
      standby's <varname>wal_receiver_timeout</varname> during logical
      replication of large transactions (Wang Wei, Amit Kapila)
     </para>

     <para>
      If a large transaction on the primary server sends no data to the
      standby (perhaps because no table it changes is published), it was
      possible for the standby to timeout.  Fix that by ensuring we send
      keepalive messages periodically in such situations.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [ee7964776] 2022-07-20 09:56:42 +0900
Branch: REL_15_STABLE [286793b98] 2022-07-20 09:56:52 +0900
Branch: REL_14_STABLE [2aedf25eb] 2022-07-20 09:52:11 +0900
Branch: REL_13_STABLE [5630f39b3] 2022-07-20 09:52:23 +0900
Branch: REL_12_STABLE [9fa00e312] 2022-07-20 09:52:29 +0900
Branch: REL_11_STABLE [87e504487] 2022-07-20 09:52:36 +0900
Branch: REL_10_STABLE [dd831afc4] 2022-07-20 09:52:43 +0900
-->
     <para>
      Disallow nested backup operations in logical replication walsenders
      (Fujii Masao)
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master Release: REL_15_BR [ac0e2d387] 2022-06-23 09:23:46 +0530
Branch: REL_14_STABLE [3238b5c33] 2022-06-23 09:20:41 +0530
Branch: REL_13_STABLE [3a6ef0cdf] 2022-06-23 09:02:16 +0530
Branch: REL_12_STABLE [9e0d9a24e] 2022-06-23 08:47:15 +0530
Branch: REL_11_STABLE [ed2a7a6bf] 2022-06-23 08:37:40 +0530
Branch: REL_10_STABLE [d873b5a5a] 2022-06-23 08:26:56 +0530
-->
     <para>
      Fix memory leak in logical replication subscribers (Hou Zhijie)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [16c80e7d0] 2022-05-31 14:47:44 -0400
Branch: REL_14_STABLE Release: REL_14_4 [c47a55852] 2022-05-31 14:47:44 -0400
Branch: REL_13_STABLE [c73748b68] 2022-05-31 14:47:44 -0400
Branch: REL_12_STABLE [a3faebd6a] 2022-05-31 14:47:44 -0400
Branch: REL_11_STABLE [ae758e603] 2022-05-31 14:47:44 -0400
Branch: REL_10_STABLE [2114910ca] 2022-05-31 14:47:44 -0400
-->
     <para>
      Prevent open-file leak when reading an invalid timezone abbreviation
      file (Kyotaro Horiguchi)
     </para>

     <para>
      Such cases could result in harmless warning messages.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_15_BR [f1431f3bf] 2022-05-28 12:12:40 +0900
Branch: REL_14_STABLE Release: REL_14_4 [fe441a031] 2022-05-28 12:12:46 +0900
Branch: REL_13_STABLE [1e6802990] 2022-05-28 12:12:51 +0900
Branch: REL_12_STABLE [ae236bf66] 2022-05-28 12:12:55 +0900
Branch: REL_11_STABLE [c3db8a2e2] 2022-05-28 12:12:58 +0900
Branch: REL_10_STABLE [1b40ceea2] 2022-05-28 12:13:02 +0900
-->
     <para>
      Allow custom server parameters to have short descriptions that are
      NULL (Steve Chavez)
     </para>

     <para>
      Previously, although extensions could choose to create such
      settings, some code paths would crash while processing them.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [e44dae07f] 2022-08-05 18:00:17 +0200
Branch: REL_15_STABLE [2cff30259] 2022-08-05 18:00:17 +0200
Branch: REL_14_STABLE [541f41d4f] 2022-08-05 18:00:17 +0200
Branch: REL_13_STABLE [de31e6f81] 2022-08-05 18:00:17 +0200
Branch: REL_12_STABLE [49b85e481] 2022-08-05 18:00:17 +0200
Branch: REL_11_STABLE [39e45d3ce] 2022-08-05 18:00:17 +0200
Branch: REL_10_STABLE [e797c7a6f] 2022-08-05 18:00:17 +0200
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [afe58c8b7] 2022-08-07 10:19:40 +0200
Branch: REL_15_STABLE [9c3006000] 2022-08-07 10:19:40 +0200
Branch: REL_14_STABLE [f4beef1c2] 2022-08-07 10:19:40 +0200
Branch: REL_13_STABLE [1626590f2] 2022-08-07 10:19:40 +0200
Branch: REL_12_STABLE [3aafd5da7] 2022-08-07 10:19:40 +0200
Branch: REL_11_STABLE [61904503b] 2022-08-07 10:19:40 +0200
Branch: REL_10_STABLE [8e5874964] 2022-08-07 10:19:40 +0200
-->
     <para>
      Fix WAL consistency checking logic to correctly
      handle <literal>BRIN_EVACUATE_PAGE</literal> flags (Haiyang Wang)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [eed959a45] 2022-07-11 16:43:29 +1200
Branch: REL_15_STABLE [53df1e28d] 2022-07-11 16:01:22 +1200
Branch: REL_14_STABLE [5e7608e81] 2022-07-11 15:47:12 +1200
Branch: REL_13_STABLE [7cdd0c2d7] 2022-07-11 15:48:54 +1200
Branch: REL_12_STABLE [4f88dbac2] 2022-07-11 15:51:47 +1200
Branch: REL_11_STABLE [cd26139a3] 2022-07-11 15:54:24 +1200
-->
     <para>
      Fix erroneous assertion checks in shared hashtable management
      (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_14_STABLE [604651880] 2022-06-22 12:11:59 -0400
Branch: REL_13_STABLE [cfc86f987] 2022-06-22 12:12:00 -0400
Branch: REL_12_STABLE [293f5c5f4] 2022-06-22 12:12:00 -0400
Branch: REL_11_STABLE [2f6b8c287] 2022-06-22 12:12:00 -0400
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: REL_14_STABLE [8657946d3] 2022-07-18 16:23:48 +0200
Branch: REL_13_STABLE [b2c8d5661] 2022-07-18 19:20:07 +0200
Branch: REL_12_STABLE [9af9e2094] 2022-07-18 19:33:46 +0200
Branch: REL_11_STABLE [6d61aef5d] 2022-07-18 19:38:24 +0200
-->
     <para>
      Arrange to clean up after commit-time errors
      within <function>SPI_commit()</function>, rather than expecting
      callers to do that (Peter Eisentraut, Tom Lane)
     </para>

     <para>
      Proper cleanup is complicated and requires use of low-level
      facilities, so it's not surprising that no known caller got it
      right.  This led to misbehaviors when a PL procedure
      issued <command>COMMIT</command> but a failure occurred (such as a
      deferred constraint check).  To improve matters,
      redefine <function>SPI_commit()</function> as starting a new
      transaction, so that it becomes equivalent
      to <function>SPI_commit_and_chain()</function> except that you get
      default transaction characteristics instead of preserving the prior
      transaction's characteristics.  To make this somewhat transparent
      API-wise, redefine <function>SPI_start_transaction()</function> as a
      no-op.  All known callers of <function>SPI_commit()</function>
      immediately call <function>SPI_start_transaction()</function>, so
      they will not notice any change.  Similar remarks apply
      to <function>SPI_rollback()</function>.
     </para>

     <para>
      Also fix PL/Python, which omitted any handling of such errors at all,
      resulting in jumping out of the Python interpreter.  This is
      reported to crash Python 3.11.  Older Python releases leak some
      memory but seem okay with it otherwise.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [2b65de7fc] 2022-05-26 14:14:05 -0400
Branch: REL_14_STABLE Release: REL_14_4 [b4be4a082] 2022-05-26 14:14:05 -0400
Branch: REL_13_STABLE [9e3dbc6fd] 2022-05-26 14:14:05 -0400
Branch: REL_12_STABLE [01ab9fb7d] 2022-05-26 14:14:05 -0400
Branch: REL_11_STABLE [a44bc8b8f] 2022-05-26 14:14:05 -0400
Branch: REL_10_STABLE [ef54a6576] 2022-05-26 14:14:05 -0400
-->
     <para>
      Remove misguided SSL key file ownership check
      in <application>libpq</application> (Tom Lane)
     </para>

     <para>
      In the previous minor releases, we copied the server's permission
      checking rules for SSL private key files into libpq.  But we should
      not have also copied the server's file-ownership check.  While that
      works in normal use-cases, it can result in an unexpected failure
      for clients running as root, and perhaps in other cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [6d157e7cb] 2022-06-06 11:20:21 -0400
Branch: REL_14_STABLE Release: REL_14_4 [a5dbca460] 2022-06-06 11:20:31 -0400
Branch: REL_13_STABLE [16d68007c] 2022-06-06 11:20:36 -0400
Branch: REL_12_STABLE [02026cadb] 2022-06-06 11:20:41 -0400
Branch: REL_11_STABLE [d82ed5b2f] 2022-06-06 11:20:46 -0400
Branch: REL_10_STABLE [89254606b] 2022-06-06 11:20:52 -0400
-->
     <para>
      Ensure <application>ecpg</application> reports server connection loss
      sanely (Tom Lane)
     </para>

     <para>
      Misprocessing of a libpq-generated error result, such as a report of
      lost connection, would lead to printing <quote>(null)</quote>
      instead of a useful error message; or in older releases it would
      lead to a crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [ba412c905] 2022-06-14 18:16:46 -0400
Branch: REL_14_STABLE [7bc21ed8c] 2022-06-14 18:16:46 -0400
Branch: REL_13_STABLE [12b8fb34a] 2022-06-14 18:16:46 -0400
Branch: REL_12_STABLE [9a3aab0f2] 2022-06-14 18:16:46 -0400
Branch: REL_11_STABLE [f7797747f] 2022-06-14 18:16:46 -0400
Branch: REL_10_STABLE [86258f083] 2022-06-14 18:16:46 -0400
-->
     <para>
      Avoid core dump in <application>ecpglib</application> with
      unexpected orders of operations (Tom Lane)
     </para>

     <para>
      Certain operations such as <command>EXEC SQL PREPARE</command> would
      crash (rather than reporting an error as expected) if called before
      establishing any database connection.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [5633836ef] 2022-07-02 13:00:30 -0700
Branch: REL_15_STABLE [7a28f7cb0] 2022-07-02 13:00:34 -0700
Branch: REL_14_STABLE [5b94e2bd4] 2022-07-02 13:00:34 -0700
Branch: REL_13_STABLE [b4d7e92bd] 2022-07-02 13:00:34 -0700
Branch: REL_12_STABLE [5e0b8f3f4] 2022-07-02 13:00:34 -0700
Branch: REL_11_STABLE [d68b731a1] 2022-07-02 13:00:35 -0700
Branch: REL_10_STABLE [12b2a2369] 2022-07-02 13:00:35 -0700
Branch: master [e2bc24283] 2022-07-02 21:03:19 -0700
Branch: REL_15_STABLE [8533eb181] 2022-07-02 21:03:22 -0700
Branch: REL_14_STABLE [463a841d7] 2022-07-02 21:03:22 -0700
Branch: REL_13_STABLE [97b005f3f] 2022-07-02 21:03:23 -0700
Branch: REL_12_STABLE [a4240139f] 2022-07-02 21:03:23 -0700
Branch: REL_11_STABLE [1cad30e3b] 2022-07-02 21:03:24 -0700
Branch: REL_10_STABLE [f5e4d64bb] 2022-07-02 21:03:24 -0700
-->
     <para>
      In <application>ecpglib</application>, avoid
      redundant <function>newlocale()</function> calls (Noah Misch)
     </para>

     <para>
      Allocate a C locale object once per process when first connecting,
      rather than creating and freeing locale objects once per query.
      This mitigates a libc memory leak on AIX, and may offer some
      performance benefit everywhere.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [21267b647] 2022-07-10 16:52:38 +1200
Branch: REL_15_STABLE [31b485f88] 2022-07-10 16:53:05 +1200
Branch: REL_14_STABLE [ab7fef0ac] 2022-07-10 16:53:18 +1200
Branch: REL_13_STABLE [e5b5b4448] 2022-07-10 16:53:39 +1200
Branch: REL_12_STABLE [09224a35c] 2022-07-10 16:54:09 +1200
Branch: REL_11_STABLE [21ed12b14] 2022-07-10 16:55:18 +1200
Branch: REL_10_STABLE [7c5953b7b] 2022-07-10 16:57:04 +1200
-->
     <para>
      In <application>psql</application>'s <command>\watch</command>
      command, echo a newline after cancellation with control-C
      (Pavel Stehule)
     </para>

     <para>
      This prevents libedit (and possibly also libreadline) from becoming
      confused about which column the cursor is in.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [8b1ec7d29] 2022-08-01 16:38:23 +0900
Branch: REL_15_STABLE [07abcd9ab] 2022-08-01 16:39:16 +0900
Branch: REL_14_STABLE [523926dea] 2022-08-01 16:39:27 +0900
Branch: REL_13_STABLE [aadaaeff4] 2022-08-01 16:39:30 +0900
Branch: REL_12_STABLE [24872bbf9] 2022-08-01 16:39:33 +0900
-->
     <para>
      Fix possible report of wrong error condition
      after <function>clone()</function> failure
      in <application>pg_upgrade</application>
      with <option>--clone</option> option (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c67c2e2a2] 2022-08-02 18:05:38 -0400
Branch: REL_15_STABLE [82ebc70d1] 2022-08-02 18:05:34 -0400
Branch: REL_14_STABLE [17fd203b4] 2022-08-02 18:05:34 -0400
Branch: REL_13_STABLE [6b67db10c] 2022-08-02 18:05:34 -0400
Branch: REL_12_STABLE [6608a4305] 2022-08-02 18:05:34 -0400
Branch: REL_11_STABLE [06f6a07ba] 2022-08-02 18:05:34 -0400
Branch: REL_10_STABLE [dd414bf4e] 2022-08-02 18:05:34 -0400
-->
     <para>
      Fix <filename>contrib/pg_stat_statements</filename> to avoid
      problems with very large query-text files on 32-bit platforms
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0a7ccee8f] 2022-07-17 17:27:50 -0400
Branch: REL_15_STABLE [b8032f481] 2022-07-17 17:27:50 -0400
Branch: REL_14_STABLE [810bcbd38] 2022-07-17 17:27:50 -0400
Branch: REL_13_STABLE [6230bd7df] 2022-07-17 17:27:50 -0400
Branch: REL_12_STABLE [288e499ba] 2022-07-17 17:27:50 -0400
Branch: REL_11_STABLE [94bcb48ab] 2022-07-17 17:27:50 -0400
Branch: REL_10_STABLE [26c9e1bd8] 2022-07-17 17:27:51 -0400
-->
     <para>
      Ensure that <filename>contrib/postgres_fdw</filename> sends
      constants of <type>regconfig</type> and other <type>reg*</type>
      types with proper schema qualification (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [4518c798b] 2022-07-14 18:01:27 +1200
Branch: REL_15_STABLE [c4a617ea1] 2022-07-14 18:00:58 +1200
Branch: REL_14_STABLE [2019e6ecf] 2022-07-14 17:48:32 +1200
Branch: REL_13_STABLE [e73fe6e82] 2022-07-14 14:32:48 +1200
Branch: REL_12_STABLE [ff78bf796] 2022-07-14 14:26:49 +1200
Branch: REL_11_STABLE [39683c69a] 2022-07-14 14:23:03 +1200
Branch: REL_10_STABLE [53cfe403c] 2022-07-14 10:50:13 +1200
Branch: master [80845b7c0] 2022-07-15 02:00:09 +1200
Branch: REL_15_STABLE [a715c2004] 2022-07-15 02:00:35 +1200
Branch: REL_14_STABLE [838364559] 2022-07-15 02:02:28 +1200
Branch: REL_13_STABLE [17aa39da5] 2022-07-15 02:04:53 +1200
Branch: REL_12_STABLE [a05f40ef8] 2022-07-15 02:06:01 +1200
Branch: REL_11_STABLE [74a9ee034] 2022-07-15 02:07:15 +1200
Branch: REL_10_STABLE [e26024bea] 2022-07-15 02:08:27 +1200
Branch: master [3b8d23a3e] 2022-07-16 12:22:42 +1200
Branch: REL_15_STABLE [91377a455] 2022-07-16 12:23:03 +1200
Branch: REL_14_STABLE [c412c60b9] 2022-07-16 12:23:14 +1200
Branch: REL_13_STABLE [c75b6b454] 2022-07-16 12:23:24 +1200
Branch: REL_12_STABLE [1661c40b9] 2022-07-16 12:23:34 +1200
Branch: REL_11_STABLE [3f2344d4a] 2022-07-16 12:23:43 +1200
Branch: REL_10_STABLE [d3b0884c0] 2022-07-16 12:23:52 +1200
-->
     <para>
      Block signals while allocating dynamic shared memory on Linux
      (Thomas Munro)
     </para>

     <para>
      This avoids problems when a signal
      interrupts <function>posix_fallocate()</function>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [389869af5] 2022-07-01 14:17:54 +1200
Branch: REL_15_STABLE [fef8c7a0c] 2022-07-01 13:15:17 +1200
Branch: REL_14_STABLE [fb81a93a6] 2022-07-01 13:16:27 +1200
Branch: REL_13_STABLE [b436047dc] 2022-07-01 14:03:48 +1200
Branch: REL_12_STABLE [f7b69b1e3] 2022-07-01 13:26:50 +1200
Branch: REL_11_STABLE [facfd0467] 2022-07-01 13:21:28 +1200
Branch: REL_10_STABLE [22b9afaf5] 2022-07-01 13:19:06 +1200
-->
     <para>
      Detect unexpected <literal>EEXIST</literal> error
      from <function>shm_open()</function> (Thomas Munro)
     </para>

     <para>
      This avoids a possible crash on Solaris.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [eb39610f8] 2022-06-01 16:15:47 -0400
Branch: REL_14_STABLE Release: REL_14_4 [1072e4c45] 2022-06-01 16:15:47 -0400
Branch: REL_13_STABLE [eeac7dd9f] 2022-06-01 16:15:47 -0400
Branch: REL_12_STABLE [c08538734] 2022-06-01 16:15:47 -0400
Branch: REL_11_STABLE [b5265196e] 2022-06-01 16:15:47 -0400
Branch: REL_10_STABLE [d5e1d5ed9] 2022-06-01 16:15:47 -0400
Branch: REL9_6_STABLE [d4c161842] 2022-06-01 16:15:47 -0400
Branch: REL9_5_STABLE [9fdeae848] 2022-06-01 16:15:47 -0400
Branch: REL9_4_STABLE [b53780e1b] 2022-06-01 16:15:47 -0400
Branch: REL9_3_STABLE [a3b685fdd] 2022-06-01 16:15:47 -0400
Branch: REL9_2_STABLE [6f9ea6cf3] 2022-06-01 16:15:47 -0400
-->
     <para>
      Adjust PL/Perl test case so it will work under Perl 5.36
      (Dagfinn Ilmari Mannsåker)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_15_BR [aff45c879] 2022-05-10 18:42:02 -0400
Branch: REL_14_STABLE Release: REL_14_4 [12736e7dc] 2022-05-10 18:42:02 -0400
Branch: REL_13_STABLE [af9b96767] 2022-05-10 18:42:02 -0400
Branch: REL_12_STABLE [8ed13fb93] 2022-05-10 18:42:02 -0400
Branch: REL_11_STABLE [36d76da81] 2022-05-10 18:42:02 -0400
Branch: REL_10_STABLE [c61f36d99] 2022-05-10 18:42:02 -0400
-->
     <para>
      Avoid incorrectly using an
      out-of-date <application>libldap_r</application> library when
      multiple <productname>OpenLDAP</productname> installations are
      present while building <productname>PostgreSQL</productname>
      (Tom Lane)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-11">
  <title>Release 12.11</title>

  <formalpara>
  <title>Release date:</title>
  <para>2022-05-12</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.10.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.11</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.10,
    see <xref linkend="release-12-10"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [a117cebd6] 2022-05-09 08:35:08 -0700
Branch: REL_14_STABLE [ab49ce7c3] 2022-05-09 08:35:12 -0700
Branch: REL_13_STABLE [35edcc0ce] 2022-05-09 08:35:12 -0700
Branch: REL_12_STABLE [7f098f7b5] 2022-05-09 08:35:12 -0700
Branch: REL_11_STABLE [48ca2904c] 2022-05-09 08:35:13 -0700
Branch: REL_10_STABLE [ef792f785] 2022-05-09 08:35:13 -0700
Author: Noah Misch <noah@leadboat.com>
Branch: master [0abc1a059] 2022-05-09 08:35:08 -0700
Branch: REL_14_STABLE [677a49478] 2022-05-09 08:35:12 -0700
Branch: REL_13_STABLE [88743d581] 2022-05-09 08:35:12 -0700
Branch: REL_12_STABLE [880511cb0] 2022-05-09 08:35:12 -0700
Branch: REL_11_STABLE [34ff15660] 2022-05-09 08:35:13 -0700
Branch: REL_10_STABLE [f26d57028] 2022-05-09 08:35:13 -0700
-->
     <para>
      Confine additional operations within <quote>security restricted
      operation</quote> sandboxes (Sergey Shinderuk, Noah Misch)
     </para>

     <para>
      Autovacuum, <command>CLUSTER</command>, <command>CREATE
      INDEX</command>, <command>REINDEX</command>, <command>REFRESH
      MATERIALIZED VIEW</command>,
      and <application>pg_amcheck</application> activated
      the <quote>security restricted operation</quote> protection
      mechanism too late, or even not at all in some code paths.
      A user having permission to create non-temporary objects within a
      database could define an object that would execute arbitrary SQL
      code with superuser permissions the next time that autovacuum
      processed the object, or that some superuser ran one of the affected
      commands against it.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Alexander Lakhin for reporting this problem.
      (CVE-2022-1552)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ec62cb0aa] 2022-03-17 18:18:05 -0400
Branch: REL_14_STABLE [1d072bd20] 2022-03-17 18:18:05 -0400
Branch: REL_13_STABLE [5e144cc89] 2022-03-17 18:18:05 -0400
Branch: REL_12_STABLE [1f5ef5ae0] 2022-03-17 18:18:05 -0400
Branch: REL_11_STABLE [13b54d1e0] 2022-03-17 18:18:05 -0400
Branch: REL_10_STABLE [205214c8b] 2022-03-17 18:18:05 -0400
-->
     <para>
      Stop using query-provided column aliases for the columns of
      whole-row variables that refer to plain tables (Tom Lane)
     </para>

     <para>
      The column names in tuples produced by a whole-row variable (such
      as <literal>tbl.*</literal> in contexts other than the top level of
      a <literal>SELECT</literal> list) are now always those of the
      associated named composite type, if there is one.  We'd previously
      attempted to make them track any column aliases that had been
      applied to the <literal>FROM</literal> entry the variable refers to.
      But that's semantically dubious, because really then the output of
      the variable is not at all of the composite type it claims to be.
      Previous attempts to deal with that inconsistency had bad results up
      to and including storing unreadable data on disk, so just give up on
      the whole idea.
     </para>

     <para>
      In cases where it's important to be able to relabel such columns,
      a workaround is to introduce an extra level of
      sub-<literal>SELECT</literal>, so that the whole-row variable is
      referring to the sub-<literal>SELECT</literal>'s output and not to a
      plain table.  Then the variable is of type <type>record</type>
      to begin with and there's no issue.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [068739fb4] 2022-03-18 16:01:42 -0400
Branch: REL_14_STABLE [ae8ec7feb] 2022-03-18 16:01:42 -0400
Branch: REL_13_STABLE [88ae77588] 2022-03-18 16:01:42 -0400
Branch: REL_12_STABLE [840729fd1] 2022-03-18 16:01:42 -0400
Branch: REL_11_STABLE [84f3ecdaa] 2022-03-18 16:01:42 -0400
Branch: REL_10_STABLE [e6fd4a3da] 2022-03-18 16:01:42 -0400
-->
     <para>
      Fix incorrect output for types <type>timestamptz</type>
      and <type>timetz</type> in <function>table_to_xmlschema()</function>
      and allied functions (Renan Soares Lopes)
     </para>

     <para>
      The xmlschema output for these types included a malformed regular
      expression.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [fe20afaee] 2022-05-09 14:15:37 -0400
Branch: REL_14_STABLE [ab2f78392] 2022-05-09 14:15:37 -0400
Branch: REL_13_STABLE [91a3a74c6] 2022-05-09 14:15:37 -0400
Branch: REL_12_STABLE [90e52884e] 2022-05-09 14:15:37 -0400
Branch: REL_11_STABLE [539f8c563] 2022-05-09 14:15:37 -0400
Branch: REL_10_STABLE [4eabaffca] 2022-05-09 14:15:37 -0400
-->
     <para>
      Avoid core dump in parser for a <literal>VALUES</literal> clause with
      zero columns (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2591ee8ec] 2022-03-21 17:44:29 -0400
Branch: REL_14_STABLE [48b6035f0] 2022-03-21 17:44:29 -0400
Branch: REL_13_STABLE [dfefe38fb] 2022-03-21 17:44:29 -0400
Branch: REL_12_STABLE [69c88e2fb] 2022-03-21 17:44:29 -0400
Branch: REL_11_STABLE [5de244196] 2022-03-21 17:44:29 -0400
Branch: REL_10_STABLE [2afa031ac] 2022-03-21 17:44:29 -0400
-->
     <para>
      Fix planner errors for <function>GROUPING()</function> constructs
      that reference outer query levels (Richard Guo, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e5691cc91] 2022-02-11 15:24:02 -0500
Branch: REL_14_STABLE [277e744ae] 2022-02-11 15:23:52 -0500
Branch: REL_13_STABLE [0778b24ce] 2022-02-11 15:23:52 -0500
Branch: REL_12_STABLE [32e801676] 2022-02-11 15:23:52 -0500
Branch: REL_11_STABLE [14ee565f3] 2022-02-11 15:23:52 -0500
Branch: REL_10_STABLE [b6f869bee] 2022-02-11 15:23:52 -0500
-->
     <para>
      Fix plan generation for index-only scans on indexes with
      both returnable and non-returnable columns (Tom Lane)
     </para>

     <para>
      The previous coding could try to read non-returnable columns
      in addition to the returnable ones.  This was fairly harmless
      because it didn't actually do anything with the bogus values,
      but it fell foul of a recently-added error check that rejected
      such a plan.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7b7ed046c] 2022-04-13 13:35:07 -0400
Branch: REL_14_STABLE [c590e514a] 2022-04-13 13:35:02 -0400
Branch: REL_13_STABLE [44096c31e] 2022-04-13 13:35:02 -0400
Branch: REL_12_STABLE [e0ed20d0b] 2022-04-13 13:35:02 -0400
-->
     <para>
      Avoid accessing a no-longer-pinned shared buffer while attempting
      to lock an outdated tuple during EvalPlanQual (Tom Lane)
     </para>

     <para>
      The code would touch the buffer a couple more times after releasing
      its pin.  In theory another process could recycle the buffer (or
      more likely, try to defragment its free space) as soon as the pin is
      gone, probably leading to failure to find the newer version of the
      tuple.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [3f74daa8d] 2022-02-14 04:17:04 +0300
Branch: REL_14_STABLE [c76665edc] 2022-02-14 03:32:31 +0300
Branch: REL_13_STABLE [ac2303aa0] 2022-02-14 03:32:34 +0300
Branch: REL_12_STABLE [7a12a9e3c] 2022-02-14 03:32:39 +0300
Branch: REL_11_STABLE [0d554775b] 2022-02-14 04:04:19 +0300
Branch: REL_10_STABLE [2e9033a54] 2022-02-14 04:04:28 +0300
-->
     <para>
      Fix query-lifespan memory leak in an IndexScan node that is
      performing reordering (Aliaksandr Kalenik)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [344a225cb] 2022-04-19 23:03:59 -0400
Branch: REL_14_STABLE [08a9e7a8c] 2022-04-19 23:03:59 -0400
Branch: REL_13_STABLE [f583633bc] 2022-04-19 23:03:59 -0400
Branch: REL_12_STABLE [481a99811] 2022-04-19 23:03:59 -0400
Branch: REL_11_STABLE [9130f8cbb] 2022-04-19 23:03:59 -0400
Branch: REL_10_STABLE [409bcfda6] 2022-04-19 23:03:59 -0400
-->
     <para>
      Fix <command>ALTER FUNCTION</command> to support changing a
      function's parallelism property and
      its <literal>SET</literal>-variable list in the same command (Tom
      Lane)
     </para>

     <para>
      The parallelism property change was lost if the same command also
      updated the function's <literal>SET</literal> clause.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [36d4efe77] 2022-04-18 12:16:45 -0400
Branch: REL_14_STABLE [e805735a8] 2022-04-18 12:16:45 -0400
Branch: REL_13_STABLE [69cefb3fb] 2022-04-18 12:16:45 -0400
Branch: REL_12_STABLE [0795da869] 2022-04-18 12:16:45 -0400
-->
     <para>
      Fix bogus errors from attempts to alter system columns of tables
      (Tom Lane)
     </para>

     <para>
      The system should just tell you that you can't do it, but sometimes
      it would report <quote>no owned sequence found</quote> instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [8ab0ebb9a] 2022-04-20 17:17:43 -0700
Branch: REL_14_STABLE [e4521841a] 2022-04-20 17:17:41 -0700
Branch: REL_13_STABLE [1272630a2] 2022-04-20 17:17:39 -0700
Branch: REL_12_STABLE [5487585e3] 2022-04-20 17:17:37 -0700
Branch: REL_11_STABLE [adb2d84fc] 2022-04-20 17:17:35 -0700
Branch: REL_10_STABLE [a903895b3] 2022-04-20 17:17:33 -0700
-->
     <para>
      Fix mis-sorting of table rows when <command>CLUSTER</command>ing
      using an index whose leading key is an expression (Peter Geoghegan,
      Thomas Munro)
     </para>

     <para>
      The table would be rebuilt with the correct data, but in an order
      having little to do with the index order.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7b6ec8653] 2022-03-21 12:22:13 -0400
Branch: REL_14_STABLE [05ccf974c] 2022-03-21 12:22:13 -0400
Branch: REL_13_STABLE [2241e5ced] 2022-03-21 12:22:13 -0400
Branch: REL_12_STABLE [d8d378d51] 2022-03-21 12:22:13 -0400
Branch: REL_11_STABLE [b8ae17fd9] 2022-03-21 12:22:13 -0400
-->
     <para>
      Fix risk of deadlock failures while dropping a partitioned index
      (Jimmy Yih, Gaurab Dey, Tom Lane)
     </para>

     <para>
      Ensure that the required table and index locks are taken in the
      standard order (parents before children, tables before indexes).
      The previous coding for <command>DROP INDEX</command> did it
      differently, and so could deadlock against concurrent queries taking
      these locks in the standard order.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [46d9bfb0a] 2022-03-16 17:20:24 +1300
Branch: REL_14_STABLE [26e007939] 2022-03-16 17:20:50 +1300
Branch: REL_13_STABLE [51e760e5a] 2022-03-16 17:21:19 +1300
Branch: REL_12_STABLE [c918f07dd] 2022-03-16 17:21:46 +1300
Branch: REL_11_STABLE [ca522c60a] 2022-03-16 17:38:55 +1300
Branch: REL_10_STABLE [fe197872c] 2022-03-16 17:41:31 +1300
-->
     <para>
      Fix race condition between <command>DROP TABLESPACE</command> and
      checkpointing (Nathan Bossart)
     </para>

     <para>
      The checkpoint forced by <command>DROP TABLESPACE</command> could
      sometimes fail to remove all dead files from the tablespace's
      directory, leading to a bogus <quote>tablespace is not empty</quote>
      error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [412ad7a55] 2022-03-24 14:52:28 -0400
Branch: REL_14_STABLE [bbace5697] 2022-03-24 14:32:48 -0400
Branch: REL_13_STABLE [1ce14b6b2] 2022-03-24 14:36:06 -0400
Branch: REL_12_STABLE [3821d66a7] 2022-03-24 14:38:51 -0400
Branch: REL_11_STABLE [118f1a332] 2022-03-24 14:49:08 -0400
Branch: REL_10_STABLE [57f618310] 2022-03-24 14:50:06 -0400
Author: Robert Haas <rhaas@postgresql.org>
Branch: REL_14_STABLE [10520f434] 2022-04-14 11:10:07 -0400
Branch: REL_13_STABLE [d18c913b7] 2022-04-14 11:10:11 -0400
Branch: REL_12_STABLE [68e605b9e] 2022-04-14 11:10:13 -0400
Branch: REL_11_STABLE [6270ee445] 2022-04-14 11:10:16 -0400
Branch: REL_10_STABLE [48b398943] 2022-04-14 11:10:18 -0400
-->
     <para>
      Fix possible trouble in crash recovery after
      a <command>TRUNCATE</command> command that overlaps a checkpoint
      (Kyotaro Horiguchi, Heikki Linnakangas, Robert Haas)
     </para>

     <para>
      <command>TRUNCATE</command> must ensure that the table's disk file
      is truncated before the checkpoint is allowed to complete.
      Otherwise, replay starting from that checkpoint might find
      unexpected data in the supposedly-removed pages, possibly causing
      replay failure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [7c38ef2a5] 2022-02-21 08:57:34 -0800
Branch: REL_14_STABLE [7bbfe5994] 2022-02-21 09:57:05 -0800
Branch: REL_13_STABLE [c2551483e] 2022-02-21 08:59:30 -0800
Branch: REL_12_STABLE [0033fc63f] 2022-02-21 08:59:32 -0800
Branch: REL_11_STABLE [3faa21bb7] 2022-02-21 08:59:34 -0800
Branch: REL_10_STABLE [cebc54b90] 2022-02-21 08:59:36 -0800
-->
     <para>
      Fix unsafe toast-data accesses during temporary object cleanup
      (Andres Freund)
     </para>

     <para>
      Temporary-object deletion during server process exit could fail
      with <quote>FATAL: cannot fetch toast data without an active
      snapshot</quote>.  This was usually harmless since the next use of
      that temporary schema would clean up successfully.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [3390ef1b7] 2022-03-16 15:35:16 +1300
Branch: REL_14_STABLE [1396b5c6e] 2022-03-16 15:35:42 +1300
Branch: REL_13_STABLE [cfdb303be] 2022-03-16 15:37:15 +1300
Branch: REL_12_STABLE [368ffdeee] 2022-03-16 15:38:13 +1300
-->
     <para>
      Improve wait logic in RegisterSyncRequest (Thomas Munro)
     </para>

     <para>
      If we run out of space in the checkpointer sync request queue (which
      is hopefully rare on real systems, but is common when testing with a
      very small buffer pool), we wait for it to drain.  While waiting, we
      should report that as a wait event so that users know what is going
      on, and also watch for postmaster death, since otherwise the loop might
      never terminate if the checkpointer has already exited.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [9d92582ab] 2022-03-23 18:22:10 +0100
Branch: REL_14_STABLE [caaeb88ff] 2022-03-23 18:22:10 +0100
Branch: REL_13_STABLE [98eb3e06c] 2022-03-23 18:22:10 +0100
Branch: REL_12_STABLE [c714ebd0e] 2022-03-23 18:22:10 +0100
Branch: REL_11_STABLE [199cd7b59] 2022-03-23 18:22:10 +0100
Branch: REL_10_STABLE [9ade3c09a] 2022-03-23 18:22:10 +0100
-->
     <para>
      Fix <quote>PANIC: xlog flush request is not satisfied</quote>
      failure during standby promotion when there is a missing WAL
      continuation record (Sami Imseih)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [8f1537d10] 2022-05-02 18:25:00 -0700
Branch: REL_14_STABLE [9ab3b2bdb] 2022-05-02 18:25:59 -0700
Branch: REL_13_STABLE [57c5ad168] 2022-05-02 18:28:10 -0700
Branch: REL_12_STABLE [edfc03ec9] 2022-05-02 18:29:52 -0700
Branch: REL_11_STABLE [9cda785b4] 2022-05-02 18:30:15 -0700
Branch: REL_10_STABLE [cbc47ad7e] 2022-05-02 18:30:38 -0700
Author: Andres Freund <andres@anarazel.de>
Branch: REL_14_STABLE [f74496dd6] 2022-05-02 18:26:09 -0700
Branch: REL_13_STABLE [0446d3bf3] 2022-05-02 18:29:35 -0700
Branch: REL_12_STABLE [a5ede1391] 2022-05-02 18:29:52 -0700
Branch: REL_11_STABLE [25d5494e2] 2022-05-02 18:30:15 -0700
Branch: REL_10_STABLE [b1f35a36e] 2022-05-02 18:30:38 -0700
Author: Andres Freund <andres@anarazel.de>
Branch: REL_14_STABLE [5ab8e8014] 2022-05-02 18:09:42 -0700
Branch: REL_13_STABLE [90abe1e17] 2022-05-02 18:09:43 -0700
Branch: REL_12_STABLE [5c8b14a71] 2022-05-02 18:09:43 -0700
Branch: REL_11_STABLE [2adb8debe] 2022-05-02 18:09:44 -0700
Branch: REL_10_STABLE [e8a0cf9b2] 2022-05-02 18:09:44 -0700
-->
     <para>
      Fix possibility of self-deadlock in hot standby conflict handling
      (Andres Freund)
     </para>

     <para>
      With unlucky timing, the WAL-applying process could get stuck
      while waiting for some other process to release a buffer lock.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [dd4ab6fd6] 2022-04-19 08:49:49 +0530
Branch: REL_14_STABLE [c9dea58e2] 2022-04-19 08:54:37 +0530
Branch: REL_13_STABLE [82d4a17a1] 2022-04-19 09:08:05 +0530
Branch: REL_12_STABLE [59348fbde] 2022-04-19 09:18:44 +0530
Branch: REL_11_STABLE [a90de822e] 2022-04-19 09:29:34 +0530
Branch: REL_10_STABLE [be46985be] 2022-04-19 09:38:25 +0530
-->
     <para>
      Ensure that logical replication apply workers can be restarted even
      when we're up against
      the <varname>max_sync_workers_per_subscription</varname> limit
      (Amit Kapila)
     </para>

     <para>
      Faulty coding of the limit check caused a restarted worker to exit
      immediately, leaving fewer workers than there should be.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [5e01001ff] 2022-02-14 08:55:58 +0530
Branch: REL_14_STABLE [04645bbca] 2022-02-14 08:07:46 +0530
Branch: REL_13_STABLE [caa231be9] 2022-02-14 08:24:44 +0530
Branch: REL_12_STABLE [ce349cf17] 2022-02-14 08:27:56 +0530
Branch: REL_11_STABLE [1cd5802ac] 2022-02-14 08:37:23 +0530
Branch: REL_10_STABLE [b5e060473] 2022-02-14 08:45:54 +0530
-->
     <para>
      Include unchanged replica identity key columns in the WAL log for an
      update, if they are stored out-of-line (Dilip Kumar, Amit Kapila)
     </para>

     <para>
      Otherwise subscribers cannot see the values and will fail to
      replicate the update.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_12_STABLE [e16db75dd] 2022-02-15 12:21:28 -0500
Branch: REL_11_STABLE [efae4401c] 2022-02-15 12:21:28 -0500
Branch: REL_10_STABLE [17a8c4c3a] 2022-02-15 12:21:28 -0500
-->
     <para>
      Improve logical replication subscriber's error message for an
      unsupported relation kind (Tom Lane)
     </para>

     <para>
      v13 and later servers support publishing partitioned tables.  Older
      server versions cannot handle subscribing to such a table, and they
      gave a very misleading error message: <quote>table XYZ not found on
      publisher</quote>.  Arrange to deliver a more on-point message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [638300fef] 2022-02-25 17:40:43 -0500
Branch: REL_14_STABLE [ac910bb23] 2022-02-25 17:40:43 -0500
Branch: REL_13_STABLE [9b2d762a2] 2022-02-25 17:40:44 -0500
Branch: REL_12_STABLE [0f7b62f29] 2022-02-25 17:40:45 -0500
Branch: REL_11_STABLE [31befa6be] 2022-02-25 17:40:45 -0500
Branch: REL_10_STABLE [4936747c4] 2022-02-25 17:40:21 -0500
-->
     <para>
      Disallow execution of SPI functions during PL/Perl function
      compilation (Tom Lane)
     </para>

     <para>
      Perl can be convinced to execute user-defined code during compilation
      of a PL/Perl function.  However, it's not okay for such code to try
      to invoke SQL operations via SPI.  That results in a crash, and if
      it didn't crash it would be a security hazard, because we really
      don't want code execution during function validation.  Put in a
      check to give a friendlier error message instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a59c79564] 2022-02-28 14:12:52 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [50f03473e] 2022-03-02 11:29:11 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_14_STABLE [2a1f84636] 2022-03-02 11:57:02 -0500
Branch: REL_13_STABLE [6599d8f12] 2022-03-02 11:57:02 -0500
Branch: REL_12_STABLE [72918ea86] 2022-03-02 11:57:02 -0500
Branch: REL_11_STABLE [5bb3d91ea] 2022-03-02 11:57:02 -0500
Branch: REL_10_STABLE [9050999ef] 2022-03-02 11:57:02 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [878e64d0f] 2022-03-31 11:24:26 -0400
Branch: REL_14_STABLE [402279afe] 2022-03-31 11:24:26 -0400
Branch: REL_13_STABLE [fb1d7f451] 2022-03-31 11:24:26 -0400
Branch: REL_12_STABLE [fcaf7d725] 2022-03-31 11:24:26 -0400
Branch: REL_11_STABLE [143043191] 2022-03-31 11:24:26 -0400
Branch: REL_10_STABLE [a6bd1f0ee] 2022-03-31 11:24:26 -0400
-->
     <para>
      Make <application>libpq</application> accept root-owned SSL private
      key files (David Steele)
     </para>

     <para>
      This change synchronizes <application>libpq</application>'s rules
      for safe ownership and permissions of SSL key files with the rules
      the server has used since release 9.6.  Namely, in addition to the
      current rules, allow the case where the key file is owned by root
      and has permissions <literal>rw-r-----</literal> or less.  This is
      helpful for system-wide management of key files.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [335fa5a26] 2022-02-12 13:23:20 -0500
Branch: REL_14_STABLE [ae27b1acc] 2022-02-12 13:23:20 -0500
Branch: REL_13_STABLE [51ee561f5] 2022-02-12 13:23:20 -0500
Branch: REL_12_STABLE [c9d35dc7f] 2022-02-12 13:23:20 -0500
-->
     <para>
      Fix behavior of <application>libpq</application>'s
      <function>PQisBusy()</function> function after a connection failure
      (Tom Lane)
     </para>

     <para>
      If we'd detected a write failure, <function>PQisBusy()</function>
      would always return true, which is the wrong thing: we want input
      processing to carry on normally until we've read whatever is
      available from the server.  The practical effect of this error is
      that applications using <application>libpq</application>'s
      async-query API would typically detect connection loss only
      when <function>PQconsumeInput()</function> returns a hard failure.
      With this fix, a connection loss will normally be reported via an
      error <structname>PGresult</structname> object, which is a much
      cleaner behavior for most applications.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a745b9365] 2022-02-10 16:49:39 -0500
Branch: REL_14_STABLE [1e8c5cf7c] 2022-02-10 16:49:39 -0500
Branch: REL_13_STABLE [d0e1fd958] 2022-02-10 16:49:39 -0500
Branch: REL_12_STABLE [61c20a5ea] 2022-02-10 16:49:39 -0500
Branch: REL_11_STABLE [69cc15c31] 2022-02-10 16:49:39 -0500
Branch: REL_10_STABLE [34523933b] 2022-02-10 16:49:39 -0500
-->
     <para>
      Make <application>pg_ctl</application> recheck postmaster aliveness
      while waiting for stop/restart/promote actions (Tom Lane)
     </para>

     <para>
      <application>pg_ctl</application> would verify that the postmaster
      is alive as a side-effect of sending the stop or promote signal, but
      then it just naively waited to see the on-disk state change.  If the
      postmaster died uncleanly without having removed its PID file or
      updated the control file, <application>pg_ctl</application> would
      wait until timeout.  Instead make it recheck every so often that the
      postmaster process is still there.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [cd83cb953] 2022-02-25 10:30:05 -0800
Branch: REL_14_STABLE [9ff7fd906] 2022-02-25 10:31:16 -0800
Branch: REL_13_STABLE [0b1020a96] 2022-02-25 10:32:38 -0800
Branch: REL_12_STABLE [5407241a8] 2022-02-25 10:34:38 -0800
Branch: REL_11_STABLE [51c341656] 2022-02-25 10:40:32 -0800
Author: Andres Freund <andres@anarazel.de>
Branch: master [264d28492] 2022-03-27 18:13:50 -0700
Branch: REL_14_STABLE [6839aa7a6] 2022-03-27 18:15:10 -0700
Branch: REL_13_STABLE [344d89abf] 2022-03-27 18:15:14 -0700
Branch: REL_12_STABLE [5ebd262dc] 2022-03-27 18:15:15 -0700
Branch: REL_11_STABLE [7d935bdf7] 2022-03-27 18:15:17 -0700
-->
     <para>
      Fix error handling in <application>pg_waldump</application> (Kyotaro
      Horiguchi, Andres Freund)
     </para>

     <para>
      While trying to read a WAL file to determine the WAL segment size,
      <application>pg_waldump</application> would report an incorrect
      error for the case of a too-short file.  In addition, the file name
      reported in this and related error messages could be garbage.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [cd4868a57] 2022-04-14 15:08:03 +0900
Branch: REL_14_STABLE [df6bbe73b] 2022-04-14 15:09:26 +0900
Branch: REL_13_STABLE [2275d044d] 2022-04-14 15:09:36 +0900
Branch: REL_12_STABLE [5378d55cb] 2022-04-14 15:09:39 +0900
Branch: REL_11_STABLE [79fed072b] 2022-04-14 15:09:42 +0900
Branch: REL_10_STABLE [12d32b7bc] 2022-04-14 15:09:46 +0900
-->
     <para>
      Ensure that <filename>contrib/pageinspect</filename> functions cope
      with all-zero pages (Michael Paquier)
     </para>

     <para>
      This is a legitimate edge case, but the module was mostly unprepared
      for it.  Arrange to return nulls, or no rows, as appropriate; that
      seems more useful than raising an error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [291e517a4] 2022-03-27 17:53:40 +0900
Branch: REL_14_STABLE [27d384441] 2022-03-27 17:53:51 +0900
Branch: REL_13_STABLE [3d4d6dee0] 2022-03-27 17:53:55 +0900
Branch: REL_12_STABLE [5ca2aa2f2] 2022-03-27 17:53:59 +0900
Branch: REL_11_STABLE [1a2fdf86a] 2022-03-27 17:54:03 +0900
Branch: REL_10_STABLE [ab80b0fbb] 2022-03-27 17:54:08 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [076f4d953] 2022-03-16 11:19:39 +0900
Branch: REL_14_STABLE [b61e6214c] 2022-03-16 11:20:47 +0900
Branch: REL_13_STABLE [d3a9b83c3] 2022-03-16 11:20:51 +0900
Branch: REL_12_STABLE [af8a8eb54] 2022-03-16 11:20:54 +0900
Branch: REL_11_STABLE [2389ee8dd] 2022-03-16 11:20:57 +0900
Branch: REL_10_STABLE [c42b88932] 2022-03-16 11:21:00 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [4477dcb20] 2022-03-16 12:29:39 +0900
Branch: REL_14_STABLE [dc5b3bdae] 2022-03-16 12:29:47 +0900
Branch: REL_13_STABLE [028a3c6b1] 2022-03-16 12:29:55 +0900
Branch: REL_12_STABLE [5cb770210] 2022-03-16 12:29:59 +0900
Branch: REL_11_STABLE [09c97746d] 2022-03-16 12:30:02 +0900
Branch: REL_10_STABLE [07e343513] 2022-03-16 12:30:07 +0900
-->
     <para>
      In <filename>contrib/pageinspect</filename>, add defenses against
      incorrect page <quote>special space</quote> contents, tighten checks
      for correct page size, and add some missing checks that an index is
      of the expected type (Michael Paquier, Justin Pryzby, Julien
      Rouhaud)
     </para>

     <para>
      These changes make it less likely that the module will crash on bad
      data.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f3dd9fe1d] 2022-03-31 14:29:48 -0400
Branch: REL_14_STABLE [9f9489aa2] 2022-03-31 14:29:24 -0400
Branch: REL_13_STABLE [79df1d20c] 2022-03-31 14:29:24 -0400
Branch: REL_12_STABLE [989d3e4a2] 2022-03-31 14:29:24 -0400
Branch: REL_11_STABLE [b9eb0412f] 2022-03-31 14:29:24 -0400
Branch: REL_10_STABLE [728fc0f9a] 2022-03-31 14:29:24 -0400
-->
     <para>
      In <filename>contrib/postgres_fdw</filename>, verify
      that <literal>ORDER BY</literal> clauses are safe to ship before
      requesting a remotely-ordered query, and include
      a <literal>USING</literal> clause if necessary (Ronan Dunklau)
     </para>

     <para>
      This fix prevents situations where the remote server might sort in a
      different order than we intend.  While sometimes that would be only
      cosmetic, it could produce thoroughly wrong results if the remote
      data is used as input for a locally-performed merge join.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [e6a760020] 2021-09-27 10:53:20 +1300
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [807fee1a3] 2022-02-04 16:16:10 +1300
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [a56e7b660] 2022-03-16 10:30:55 +1300
Author: Thomas Munro <tmunro@postgresql.org>
Branch: REL_14_STABLE [d9f7ad54e] 2022-03-16 11:42:00 +1300
Branch: REL_13_STABLE [5610411ac] 2022-03-16 11:41:13 +1300
Branch: REL_12_STABLE [45a469eb2] 2022-03-16 11:40:43 +1300
Branch: REL_11_STABLE [986d24042] 2022-03-16 11:35:00 +1300
-->
     <para>
      Update <acronym>JIT</acronym> code to work with LLVM 14
      (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [46ab07ffd] 2022-03-03 18:13:24 -0500
Branch: REL_14_STABLE [b0bc196e5] 2022-03-03 18:13:24 -0500
Branch: REL_13_STABLE [1a027e6b7] 2022-03-03 18:13:24 -0500
Branch: REL_12_STABLE [f727b6ea8] 2022-03-03 18:13:24 -0500
Branch: REL_11_STABLE [f2087e26e] 2022-03-03 18:13:24 -0500
Branch: REL_10_STABLE [cfbe87bd6] 2022-03-03 18:13:24 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0fbdfaf79] 2022-03-03 19:03:17 -0500
Branch: REL_14_STABLE [5c9d17e94] 2022-03-03 19:03:35 -0500
Branch: REL_13_STABLE [97031f440] 2022-03-03 19:03:42 -0500
Branch: REL_12_STABLE [4b0696b36] 2022-03-03 19:03:46 -0500
Branch: REL_11_STABLE [566e1c04d] 2022-03-03 19:03:50 -0500
Branch: REL_10_STABLE [18c04d157] 2022-03-03 19:03:55 -0500
Author: Andres Freund <andres@anarazel.de>
Branch: master [3ac7d0241] 2022-03-23 13:05:59 -0700
Branch: REL_14_STABLE [81045e1e1] 2022-03-23 13:18:02 -0700
Branch: REL_13_STABLE [c0f99bb52] 2022-03-23 13:18:00 -0700
Branch: REL_12_STABLE [61a007fee] 2022-03-23 13:17:59 -0700
Author: Andres Freund <andres@anarazel.de>
Branch: master [1c6bb380e] 2022-03-23 13:05:25 -0700
Branch: REL_14_STABLE [89a94c24a] 2022-03-23 13:13:18 -0700
Branch: REL_13_STABLE [8014c61eb] 2022-03-23 13:13:20 -0700
Branch: REL_12_STABLE [c5b60a68c] 2022-03-23 13:13:33 -0700
Branch: REL_11_STABLE [2121d5809] 2022-03-23 13:13:40 -0700
Branch: REL_10_STABLE [5f4615b9d] 2022-03-23 13:13:49 -0700
Author: Andres Freund <andres@anarazel.de>
Branch: master [e71c76fca] 2022-03-23 12:43:14 -0700
Branch: REL_14_STABLE [e52e9bd57] 2022-03-23 12:43:41 -0700
Branch: REL_13_STABLE [7c163aa93] 2022-03-23 12:43:40 -0700
Branch: REL_12_STABLE [6a767bc2e] 2022-03-23 12:43:38 -0700
Branch: REL_11_STABLE [a77dddb42] 2022-03-23 12:43:36 -0700
Branch: REL_10_STABLE [2a9193726] 2022-03-23 12:43:33 -0700
-->
     <para>
      Clean up assorted failures under <productname>clang</productname>'s
      <literal>-fsanitize=undefined</literal> checks (Tom Lane, Andres
      Freund, Zhihong Yu)
     </para>

     <para>
      Most of these changes are just for pro-forma compliance with the
      letter of the C and POSIX standards, and are unlikely to have any
      effect on production builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d5c2a91e5] 2022-02-08 19:25:56 -0500
Branch: REL_14_STABLE [e327291e4] 2022-02-08 19:26:09 -0500
Branch: REL_13_STABLE [5ea3b99de] 2022-02-08 19:26:17 -0500
Branch: REL_12_STABLE [eba0f095c] 2022-02-08 19:26:22 -0500
Branch: REL_11_STABLE [3a6e3a890] 2022-02-08 19:26:26 -0500
Branch: REL_10_STABLE [1a8b6f055] 2022-02-08 19:26:30 -0500
-->
     <para>
      Fix PL/Perl so it builds on C compilers that don't support statements
      nested within expressions (Tom Lane)
     </para>

     <para>
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [097786fbb] 2022-03-22 08:22:02 -0700
Branch: REL_14_STABLE [2d608c960] 2022-03-22 08:28:51 -0700
Branch: REL_13_STABLE [f183e23cc] 2022-03-22 08:28:52 -0700
Branch: REL_12_STABLE [4553b960f] 2022-03-22 08:28:53 -0700
Branch: REL_11_STABLE [cd1951ba0] 2022-03-22 08:28:54 -0700
Branch: REL_10_STABLE [083031aa9] 2022-03-22 08:28:55 -0700
-->
     <para>
      Fix possible build failure of <application>pg_dumpall</application>
      on Windows, when not using MSVC to build (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [ea09a75e1] 2022-02-10 13:44:05 -0500
Branch: REL_14_STABLE [92f60f536] 2022-02-10 13:51:19 -0500
Branch: REL_13_STABLE [eec7c640f] 2022-02-10 13:51:40 -0500
Branch: REL_12_STABLE [64dd64807] 2022-02-10 13:51:49 -0500
Branch: REL_11_STABLE [e2d104e19] 2022-02-10 13:51:59 -0500
Branch: REL_10_STABLE [a5eef80c2] 2022-02-10 13:52:05 -0500
Branch: REL9_6_STABLE [622ab6a34] 2022-02-10 13:52:37 -0500
Branch: REL9_5_STABLE [3a5034b5e] 2022-02-10 13:53:56 -0500
Branch: REL9_4_STABLE [c76164ea0] 2022-02-10 13:56:55 -0500
-->
     <para>
      In Windows builds, use <application>gendef</application> instead
      of <application>pexports</application> to build DEF files (Andrew
      Dunstan)
     </para>

     <para>
      This adapts the build process to work on recent MSys tool chains.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [b787c554c] 2022-04-25 15:47:55 -0400
Branch: REL_14_STABLE [71f394667] 2022-04-25 15:49:35 -0400
Branch: REL_13_STABLE [d9cede2c3] 2022-04-25 15:50:01 -0400
Branch: REL_12_STABLE [01f2bc5af] 2022-04-25 15:50:07 -0400
Branch: REL_11_STABLE [b90ce0dd7] 2022-04-25 15:51:27 -0400
Branch: REL_10_STABLE [58887d58c] 2022-04-25 15:51:58 -0400
-->
     <para>
      Prevent extra expansion of shell wildcard patterns in programs built
      under MinGW (Andrew Dunstan)
     </para>

     <para>
      For some reason the C library provided by MinGW will expand shell
      wildcard characters in a program's command-line arguments by
      default.  This is confusing, not least because it doesn't happen
      under MSVC, so turn it off.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ab3479bf5] 2022-05-05 14:54:53 -0400
Branch: REL_14_STABLE [77ee14ed9] 2022-05-05 14:55:03 -0400
Branch: REL_13_STABLE [e9735d1af] 2022-05-05 14:55:10 -0400
Branch: REL_12_STABLE [2bb9f7501] 2022-05-05 14:55:17 -0400
Branch: REL_11_STABLE [da72ff09b] 2022-05-05 14:55:22 -0400
Branch: REL_10_STABLE [bc334ec9f] 2022-05-05 14:55:30 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2022a for DST law changes in Palestine, plus historical
      corrections for Chile and Ukraine.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-10">
  <title>Release 12.10</title>

  <formalpara>
  <title>Release date:</title>
  <para>2022-02-10</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.9.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.10</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you have applied <command>REINDEX CONCURRENTLY</command>
    to a TOAST table's index, or observe failures to access TOAST datums,
    see the first changelog entry below.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 12.9,
    see <xref linkend="release-12-9"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [f99870dd8] 2021-12-08 11:01:08 +0900
Branch: REL_14_STABLE [64ab21f0e] 2021-12-08 11:01:14 +0900
Branch: REL_13_STABLE [9acea52ea] 2021-12-08 11:01:19 +0900
Branch: REL_12_STABLE [5ed74d874] 2021-12-08 11:01:23 +0900
-->
     <para>
      Enforce standard locking protocol for TOAST table updates, to prevent
      problems with <command>REINDEX CONCURRENTLY</command> (Michael Paquier)
     </para>

     <para>
      If applied to a TOAST table or TOAST table's index, <command>REINDEX
      CONCURRENTLY</command> tended to produce a corrupted index.  This
      happened because sessions updating TOAST entries released
      their <literal>ROW EXCLUSIVE</literal> locks immediately, rather
      than holding them until transaction commit as all other updates do.
      The fix is to make TOAST updates hold the table lock according to the
      normal rule.  Any existing corrupted indexes can be repaired by
      reindexing again.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [f9a74c149] 2022-01-25 21:10:03 +1300
Branch: REL_14_STABLE [357ff6615] 2022-01-25 21:14:27 +1300
Branch: REL_13_STABLE [f8807e774] 2022-01-25 21:15:00 +1300
Branch: REL_12_STABLE [2ccd8fb29] 2022-01-25 21:15:40 +1300
-->
     <para>
      Fix incorrect plan creation for parallel single-child Append nodes
      (David Rowley)
     </para>

     <para>
      In some cases the Append would be simplified away when it should not
      be, leading to wrong query results (duplicated rows).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4ace45677] 2022-01-01 16:12:03 -0500
Branch: REL_14_STABLE [cabea571d] 2022-01-01 16:12:03 -0500
Branch: REL_13_STABLE [45ae42714] 2022-01-01 16:12:03 -0500
Branch: REL_12_STABLE [f789b7732] 2022-01-01 16:12:03 -0500
Branch: REL_11_STABLE [e3a4c7981] 2022-01-01 16:12:03 -0500
Branch: REL_10_STABLE [70a31a0e3] 2022-01-01 16:12:03 -0500
Branch: master [9a3ddeb51] 2022-01-03 15:42:27 -0500
Branch: REL_14_STABLE [d228af79d] 2022-01-03 15:42:27 -0500
Branch: REL_13_STABLE [20d08b2c6] 2022-01-03 15:42:27 -0500
Branch: REL_12_STABLE [9c4f38908] 2022-01-03 15:42:27 -0500
Branch: REL_11_STABLE [ec3674521] 2022-01-03 15:42:27 -0500
Branch: REL_10_STABLE [7d344f004] 2022-01-03 15:42:27 -0500
-->
     <para>
      Fix index-only scan plans for cases where not all index columns can
      be returned (Tom Lane)
     </para>

     <para>
      If an index has both returnable and non-returnable columns, and one
      of the non-returnable columns is an expression using a table column
      that appears in a returnable index column, then a query using that
      expression could result in an index-only scan plan that attempts to
      read the non-returnable column, instead of recomputing the
      expression from the returnable column as intended.  The
      non-returnable column would read as NULL, resulting in wrong query
      results.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9c356f4b2] 2021-12-16 15:36:02 -0500
Branch: REL_14_STABLE [f9a8bc9f2] 2021-12-16 15:36:02 -0500
Branch: REL_13_STABLE [da0d8a454] 2021-12-16 15:36:02 -0500
Branch: REL_12_STABLE [e1fd61c8c] 2021-12-16 15:36:02 -0500
Branch: REL_11_STABLE [c43d72b24] 2021-12-16 15:36:02 -0500
Branch: REL_10_STABLE [1acf34586] 2021-12-16 15:36:02 -0500
-->
     <para>
      Ensure that casting to an unspecified typmod generates a RelabelType
      node rather than a length-coercion function call (Tom Lane)
     </para>

     <para>
      While the coercion function should do the right thing (nothing),
      this translation is undesirably inefficient.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [44bd3ed33] 2021-11-26 11:14:27 -0300
Branch: REL_14_STABLE [d24dac954] 2021-11-26 11:14:27 -0300
Branch: REL_13_STABLE [ef41c3fd6] 2021-11-26 11:14:27 -0300
Branch: REL_12_STABLE [9c6ab1ef3] 2021-11-26 11:14:27 -0300
Branch: REL_11_STABLE [2c3fddcbb] 2021-11-26 11:14:27 -0300
Branch: REL_10_STABLE [72cf39d51] 2021-11-26 11:14:27 -0300
-->
     <para>
      Fix WAL replay failure when database consistency is reached exactly
      at a WAL page boundary (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [f192e1bdf] 2022-01-27 20:13:55 +0100
Branch: REL_14_STABLE [fb2f8e534] 2022-01-27 20:15:37 +0100
Branch: REL_13_STABLE [e90f258ac] 2022-01-27 20:16:39 +0100
Branch: REL_12_STABLE [4b8af2bf8] 2022-01-27 20:17:36 +0100
Branch: REL_11_STABLE [5cb88648e] 2022-01-27 20:18:22 +0100
Branch: REL_10_STABLE [4ef38fbe8] 2022-01-27 20:19:39 +0100
-->
     <para>
      Fix startup of a physical replica to tolerate transaction ID
      wraparound (Abhijit Menon-Sen, Tomas Vondra)
     </para>

     <para>
      If a replica server is started while the set of active transactions
      on the primary crosses a wraparound boundary (so that there are some
      newer transactions with smaller XIDs than older ones), the replica
      would fail with <quote>out-of-order XID insertion in
      KnownAssignedXids</quote>.  The replica would retry, but could never
      get past that error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6aa518614] 2022-01-24 15:33:38 -0500
Branch: REL_14_STABLE [1efcc5946] 2022-01-24 15:33:34 -0500
Branch: REL_13_STABLE [d67354d87] 2022-01-24 15:33:34 -0500
Branch: REL_12_STABLE [689f75d6e] 2022-01-24 15:33:34 -0500
Branch: REL_11_STABLE [4ec54498c] 2022-01-24 15:33:34 -0500
Branch: REL_10_STABLE [9af6d4b5a] 2022-01-24 15:33:34 -0500
Branch: master [3c06ec6d1] 2022-01-24 12:09:46 -0500
Branch: REL_14_STABLE [ef9706bbc] 2022-01-24 12:09:46 -0500
Branch: REL_13_STABLE [c94c6612d] 2022-01-24 12:09:46 -0500
Branch: REL_12_STABLE [a8ce5c8d7] 2022-01-24 12:09:46 -0500
Branch: REL_11_STABLE [449a69623] 2022-01-24 12:09:46 -0500
Branch: REL_10_STABLE [daf658982] 2022-01-24 12:09:46 -0500
-->
     <para>
      Remove lexical limitations for SQL commands issued on a logical
      replication connection (Tom Lane)
     </para>

     <para>
      The walsender process would fail for a SQL command containing an
      unquoted semicolon, or with dollar-quoted literals containing odd
      numbers of single or double quote marks, or when the SQL command
      starts with a comment.  Moreover, faulty error recovery could lead
      to unexpected errors in later commands too.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [237d1f317] 2022-01-21 14:54:04 +0900
Branch: REL_14_STABLE [84db5169d] 2022-01-21 14:54:47 +0900
Branch: REL_13_STABLE [b5f634116] 2022-01-21 14:54:51 +0900
Branch: REL_12_STABLE [1c0452c48] 2022-01-21 14:54:55 +0900
Branch: REL_11_STABLE [0ffe2975c] 2022-01-21 14:54:59 +0900
Branch: REL_10_STABLE [919be95c6] 2022-01-21 14:55:04 +0900
-->
     <para>
      Fix possible loss of the commit timestamp for the last
      subtransaction of a transaction (Alex Kingsborough, Kyotaro Horiguchi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [1fabec7d7] 2022-01-21 11:22:55 -0800
Branch: REL_14_STABLE [2b7dbe4bd] 2022-01-21 11:24:12 -0800
Branch: REL_13_STABLE [fd48e5f5d] 2022-01-21 11:24:12 -0800
Branch: REL_12_STABLE [1c6d055ba] 2022-01-21 11:24:12 -0800
Branch: REL_11_STABLE [2c15b29f7] 2022-01-21 11:24:12 -0800
Branch: REL_10_STABLE [f862cc09f] 2022-01-21 11:24:12 -0800
-->
     <para>
      Be sure to <function>fsync</function>
      the <filename>pg_logical/mappings</filename> subdirectory during
      checkpoints (Nathan Bossart)
     </para>

     <para>
      On some filesystems this oversight could lead to losing logical
      rewrite status files after a system crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [20b9fa308] 2022-01-15 19:06:48 +0100
Branch: REL_14_STABLE [ea212bd95] 2022-01-15 19:05:22 +0100
Branch: REL_13_STABLE [d6817032d] 2022-01-15 19:14:00 +0100
Branch: REL_12_STABLE [9d1bcf5dc] 2022-01-15 19:02:58 +0100
Branch: REL_11_STABLE [491182e52] 2022-01-15 18:32:20 +0100
Branch: REL_10_STABLE [9211c2e38] 2022-01-15 18:30:45 +0100
-->
     <para>
      Build extended statistics for partitioned tables (Justin Pryzby)
     </para>

     <para>
      A previous bug fix disabled building of extended statistics for
      old-style inheritance trees, but it also prevented building them for
      partitioned tables, which was an unnecessary restriction.
      This change allows <command>ANALYZE</command> to compute values for
      statistics objects for partitioned tables.  (But note that
      autovacuum does not process partitioned tables as such, so you must
      periodically issue manual <command>ANALYZE</command> on the
      partitioned table if you want to maintain such statistics.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [36c4bc6e7] 2022-01-15 02:20:54 +0100
Branch: REL_14_STABLE [2cc007fd0] 2022-01-15 02:26:26 +0100
Branch: REL_13_STABLE [acfde7c58] 2022-01-15 02:30:06 +0100
Branch: REL_12_STABLE [76569ad6f] 2022-01-15 03:14:55 +0100
Branch: REL_11_STABLE [b3cac25f4] 2022-01-15 02:40:40 +0100
Branch: REL_10_STABLE [ff0e7c7e8] 2022-01-15 03:05:06 +0100
-->
     <para>
      Ignore extended statistics for inheritance trees (Justin Pryzby)
     </para>

     <para>
      Currently, extended statistics values are only computed locally for
      each table, not for entire inheritance trees.  However the values
      were mistakenly consulted when planning queries across inheritance
      trees, possibly resulting in worse-than-default estimates.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7ead9925f] 2022-01-06 16:46:46 -0500
Branch: REL_14_STABLE [f285d9583] 2022-01-06 16:46:46 -0500
Branch: REL_13_STABLE [86d4bbb56] 2022-01-06 16:46:46 -0500
Branch: REL_12_STABLE [ccc7c3ad8] 2022-01-06 16:46:46 -0500
Branch: REL_11_STABLE [2ce113a4f] 2022-01-06 16:46:46 -0500
Branch: REL_10_STABLE [e5b044c84] 2022-01-06 16:46:46 -0500
-->
     <para>
      Disallow altering data type of a partitioned table's columns when
      the partitioned table's row type is used as a composite type
      elsewhere (Tom Lane)
     </para>

     <para>
      This restriction has long existed for regular tables, but through an
      oversight it was not checked for partitioned tables.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [f0d43947a] 2021-11-25 15:04:56 +0900
Branch: REL_14_STABLE [e415916e2] 2021-11-25 15:05:24 +0900
Branch: REL_13_STABLE [37827de43] 2021-11-25 15:05:28 +0900
Branch: REL_12_STABLE [216156fec] 2021-11-25 15:05:31 +0900
Branch: REL_11_STABLE [dffe80e55] 2021-11-25 15:05:34 +0900
Branch: REL_10_STABLE [817c469c2] 2021-11-25 15:05:37 +0900
-->
     <para>
      Disallow <literal>ALTER TABLE ... DROP NOT NULL</literal> for a
      column that is part of a replica identity index (Haiying Tang, Hou
      Zhijie)
     </para>

     <para>
      The same prohibition already existed for primary key indexes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d8fbbb925] 2022-01-22 13:32:40 -0500
Branch: REL_14_STABLE [3839e29c5] 2022-01-22 13:32:40 -0500
Branch: REL_13_STABLE [31b7b4d26] 2022-01-22 13:32:40 -0500
Branch: REL_12_STABLE [e2d53c876] 2022-01-22 13:32:40 -0500
Branch: REL_11_STABLE [26c841ed1] 2022-01-22 13:32:40 -0500
-->
     <para>
      Correctly update cached table state during <command>ALTER TABLE ADD
      PRIMARY KEY USING INDEX</command> (Hou Zhijie)
     </para>

     <para>
      Concurrent sessions failed to update their opinion of whether the
      table has a primary key, possibly causing incorrect logical
      replication behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [354a1f8d2] 2021-11-16 08:10:13 +0530
Branch: REL_14_STABLE [232fd72a5] 2021-11-16 08:34:24 +0530
Branch: REL_13_STABLE [63c3eeddc] 2021-11-16 08:46:12 +0530
Branch: REL_12_STABLE [9816e2d31] 2021-11-16 09:05:51 +0530
Branch: REL_11_STABLE [40fb634b1] 2021-11-16 09:25:04 +0530
Branch: REL_10_STABLE [2c0443c59] 2021-11-16 09:44:00 +0530
-->
     <para>
      Correctly update cached table state when switching <literal>REPLICA
      IDENTITY</literal> index (Tang Haiying, Hou Zhijie)
     </para>

     <para>
      Concurrent sessions failed to update their opinion of which index is
      the replica identity one, possibly causing incorrect logical
      replication behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [babe545ca] 2021-12-01 13:44:46 -0500
Branch: REL_14_STABLE [8f4b0200e] 2021-12-01 13:44:47 -0500
Branch: REL_13_STABLE [7413caabe] 2021-12-01 13:44:47 -0500
Branch: REL_12_STABLE [5cf08b4db] 2021-12-01 13:44:47 -0500
Branch: REL_11_STABLE [82d354411] 2021-12-01 13:44:47 -0500
Branch: REL_10_STABLE [fec187dc3] 2021-12-01 13:44:47 -0500
-->
     <para>
      Avoid leaking memory during <command>REASSIGN OWNED BY</command>
      operations that reassign ownership of many objects (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [2dbb7b9b2] 2022-01-26 09:58:59 +0100
Branch: REL_14_STABLE [4afae689e] 2022-01-26 09:59:14 +0100
Branch: REL_13_STABLE [81596645c] 2022-01-26 09:59:19 +0100
Branch: REL_12_STABLE [aa58f5c53] 2022-01-26 09:59:23 +0100
-->
     <para>
      Fix display of <literal>cert</literal> authentication method's
      options in <structname>pg_hba_file_rules</structname> view (Magnus
      Hagander)
     </para>

     <para>
      The <literal>cert</literal> authentication method implies
      <literal>clientcert=verify-full</literal>, but the
      <structname>pg_hba_file_rules</structname> view incorrectly reported
      <literal>clientcert=verify-ca</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [43c217512] 2022-01-13 17:49:46 -0500
Branch: REL_14_STABLE [4aee39ddb] 2022-01-13 17:49:26 -0500
Branch: REL_13_STABLE [ca14c4184] 2022-01-13 17:49:26 -0500
Branch: REL_12_STABLE [45a3cefad] 2022-01-13 17:49:26 -0500
Branch: REL_11_STABLE [3a1bfe256] 2022-01-13 17:49:26 -0500
Branch: REL_10_STABLE [3433a1fc7] 2022-01-13 17:49:26 -0500
-->
     <para>
      Fix display of whole-row variables appearing
      in <literal>INSERT ... VALUES</literal> rules (Tom Lane)
     </para>

     <para>
      A whole-row variable would be printed as <quote>var.*</quote>,
      but that allows it to be expanded to individual columns when
      the rule is reloaded, resulting in different semantics.
      Attach an explicit cast to prevent that, as we do elsewhere.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [f66885bec] 2022-01-04 13:01:05 -0300
Branch: REL_14_STABLE [f185f35a8] 2022-01-04 13:01:05 -0300
Branch: REL_13_STABLE [29f9fb8fe] 2022-01-04 13:01:05 -0300
Branch: REL_12_STABLE [6b681cd05] 2022-01-04 13:01:05 -0300
Branch: REL_11_STABLE [28cd57416] 2022-01-04 13:01:05 -0300
Branch: REL_10_STABLE [026a93727] 2022-01-04 13:01:05 -0300
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [67a8cb5cb] 2022-01-04 13:21:23 -0300
Branch: REL_14_STABLE [f9db153c2] 2022-01-04 13:21:23 -0300
Branch: REL_13_STABLE [33fdd9f85] 2022-01-04 13:21:23 -0300
Branch: REL_12_STABLE [397b43948] 2022-01-04 13:21:23 -0300
Branch: REL_11_STABLE [b63851a45] 2022-01-04 13:21:23 -0300
Branch: REL_10_STABLE [4a8282425] 2022-01-04 13:21:23 -0300
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [2e577c944] 2021-12-22 15:38:00 +0900
Branch: REL_14_STABLE [8a22a40b2] 2021-12-22 15:38:05 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [ece8c7619] 2021-12-14 10:58:15 +0900
Branch: REL_14_STABLE [4be3e005e] 2021-12-14 10:58:25 +0900
Branch: REL_13_STABLE [3f710fc2b] 2021-12-14 10:58:29 +0900
Branch: REL_12_STABLE [65af1e842] 2021-12-14 10:58:33 +0900
Branch: REL_11_STABLE [8abb6c27e] 2021-12-14 10:58:37 +0900
-->
     <para>
      Fix or remove some incorrect assertions (Simon Riggs, Michael
      Paquier, Alexander Lakhin)
     </para>

     <para>
      These errors should affect only debug builds, not production.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1f655fdc3] 2022-01-21 15:36:27 -0500
Branch: REL_14_STABLE [f4ebf0dbe] 2022-01-21 15:36:28 -0500
Branch: REL_13_STABLE [64ebb43df] 2022-01-21 15:36:28 -0500
Branch: REL_12_STABLE [5521d8139] 2022-01-21 15:36:29 -0500
Branch: REL_11_STABLE [37f5dc8b8] 2022-01-21 15:36:29 -0500
Branch: REL_10_STABLE [0c7c94f90] 2022-01-21 15:36:30 -0500
-->
     <para>
      Fix race condition that could lead to failure to localize error
      messages that are reported early in multi-threaded use
      of <application>libpq</application>
      or <application>ecpglib</application> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f3f467b8f] 2022-01-17 12:52:44 -0500
Branch: REL_14_STABLE [050949877] 2022-01-17 12:52:44 -0500
Branch: REL_13_STABLE [f27af7b88] 2022-01-17 12:52:44 -0500
Branch: REL_12_STABLE [38f099ef9] 2022-01-17 12:52:44 -0500
Branch: REL_11_STABLE [8b107467c] 2022-01-17 12:52:44 -0500
Branch: REL_10_STABLE [9d66c43eb] 2022-01-17 12:52:45 -0500
-->
     <para>
      Avoid calling <function>strerror</function>
      from <application>libpq</application>'s <function>PQcancel</function>
      function (Tom Lane)
     </para>

     <para>
      <function>PQcancel</function> is supposed to be safe to call from a
      signal handler, but <function>strerror</function> is not safe.  The
      faulty usage only occurred in the unlikely event of failure to
      send the cancel message to the server, perhaps explaining the lack
      of reports.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d6eb5a0c2] 2021-11-12 14:55:32 -0500
Branch: REL_14_STABLE [99389cb66] 2021-11-12 14:55:32 -0500
Branch: REL_13_STABLE [843925fad] 2021-11-12 14:55:32 -0500
Branch: REL_12_STABLE [523adcc12] 2021-11-12 14:55:32 -0500
Branch: REL_11_STABLE [b062ca508] 2021-11-12 14:55:32 -0500
Branch: REL_10_STABLE [3bc46e4e9] 2021-11-12 14:55:32 -0500
-->
     <para>
      Make <application>psql</application>'s <command>\password</command>
      command default to setting the password
      for <literal>CURRENT_USER</literal>, not the connection's original
      user name (Tom Lane)
     </para>

     <para>
      This agrees with the documented behavior, and avoids probable
      permissions failure if <command>SET ROLE</command> or <command>SET
      SESSION AUTHORIZATION</command> has been done since the session began.
      To prevent confusion, the role name to be acted on is now
      included in the password prompt.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2131c049d] 2022-01-17 13:30:04 -0500
Branch: REL_14_STABLE [4e8726566] 2022-01-17 13:30:04 -0500
Branch: REL_13_STABLE [d18ec312f] 2022-01-17 13:30:04 -0500
Branch: REL_12_STABLE [6d1a854c1] 2022-01-17 13:30:04 -0500
Branch: REL_11_STABLE [92e6c1c9b] 2022-01-17 13:30:04 -0500
Branch: REL_10_STABLE [62bfa554b] 2022-01-17 13:30:04 -0500
-->
     <para>
      In <application>psql</application> and some other client programs,
      avoid trying to invoke <function>gettext()</function> from a
      control-C signal handler (Tom Lane)
     </para>

     <para>
      While no reported failures have been traced to this mistake, it seems
      highly unlikely to be a safe thing to do.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [282b6d00a] 2021-11-21 14:13:35 -0500
Branch: REL_14_STABLE [3bd7556bb] 2021-11-21 14:13:35 -0500
Branch: REL_13_STABLE [33edf4a3c] 2021-11-21 14:13:35 -0500
Branch: REL_12_STABLE [93295932d] 2021-11-21 14:13:35 -0500
Branch: REL_11_STABLE [c2242d364] 2021-11-21 14:13:35 -0500
Branch: REL_10_STABLE [3ce5d0884] 2021-11-21 14:13:35 -0500
-->
     <para>
      Allow canceling the initial password prompt
      in <application>pg_receivewal</application>
      and <application>pg_recvlogical</application> (Tom Lane, Nathan
      Bossart)
     </para>

     <para>
      Previously it was impossible to terminate these programs via control-C
      while they were prompting for a password.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b55f2b692] 2021-11-22 17:16:29 -0500
Branch: REL_14_STABLE [0fdf67476] 2021-11-22 17:16:29 -0500
Branch: REL_13_STABLE [d4f6a36d8] 2021-11-22 17:16:29 -0500
Branch: REL_12_STABLE [69949ea68] 2021-11-22 17:16:29 -0500
Branch: REL_11_STABLE [54619a25d] 2021-11-22 17:16:29 -0500
Branch: REL_10_STABLE [2b36973d9] 2021-11-22 17:16:29 -0500
-->
     <para>
      Fix <application>pg_dump</application>'s dump ordering for
      user-defined casts (Tom Lane)
     </para>

     <para>
      In rare cases, the output script might refer to a user-defined cast
      before it had been created.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0b126c6a4] 2021-11-22 15:25:48 -0500
Branch: REL_14_STABLE [aedc4600d] 2021-11-22 15:25:48 -0500
Branch: REL_13_STABLE [6fc8b145e] 2021-11-22 15:25:48 -0500
Branch: REL_12_STABLE [1e7f588ad] 2021-11-22 15:25:48 -0500
Branch: master [db3a660c6] 2021-11-22 15:57:31 -0500
Branch: REL_14_STABLE [72842a575] 2021-11-22 15:57:43 -0500
Branch: REL_13_STABLE [b542e4596] 2021-11-22 15:57:52 -0500
Branch: REL_12_STABLE [72582531b] 2021-11-22 15:57:59 -0500
Branch: REL_11_STABLE [22d2b6611] 2021-11-22 15:58:05 -0500
Branch: REL_10_STABLE [b599b8f39] 2021-11-22 15:58:12 -0500
-->
     <para>
      Fix <application>pg_dump</application>'s <option>--inserts</option>
      and  <option>--column-inserts</option> modes to handle tables
      containing both generated columns and dropped columns (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [248c3a937] 2021-11-17 14:16:34 -0500
Branch: REL_14_STABLE [53c4a580e] 2021-11-17 14:16:34 -0500
Branch: REL_13_STABLE [c8b5221b5] 2021-11-17 14:16:34 -0500
Branch: REL_12_STABLE [8378dad4c] 2021-11-17 14:16:34 -0500
Branch: REL_11_STABLE [a414eb850] 2021-11-17 14:16:34 -0500
Branch: REL_10_STABLE [13799bb93] 2021-11-17 14:16:34 -0500
Branch: master [3cac2c8ca] 2021-11-17 13:08:25 -0500
Branch: REL_14_STABLE [6b413b41b] 2021-11-17 13:08:25 -0500
Branch: REL_13_STABLE [bbda88c33] 2021-11-17 13:08:25 -0500
Branch: REL_12_STABLE [12bf11889] 2021-11-17 13:08:25 -0500
-->
     <para>
      Fix possible mis-reporting of errors
      in <application>pg_dump</application>
      and <application>pg_basebackup</application> (Tom Lane)
     </para>

     <para>
      The previous code failed to check for errors from some kernel calls,
      and could report the wrong errno values in other cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [54b1cb7eb] 2022-01-08 14:54:39 -0500
Branch: REL_14_STABLE [043c1e1a7] 2022-01-08 14:54:39 -0500
Branch: REL_13_STABLE [823d4c7e2] 2022-01-08 14:54:39 -0500
Branch: REL_12_STABLE [3a69d45af] 2022-01-08 14:54:39 -0500
Branch: REL_11_STABLE [38cbdd22d] 2022-01-08 14:54:39 -0500
Branch: REL_10_STABLE [b21986908] 2022-01-08 14:54:39 -0500
-->
     <para>
      Fix results of index-only scans
      on <filename>contrib/btree_gist</filename> indexes
      on <type>char(<replaceable>N</replaceable>)</type> columns (Tom Lane)
     </para>

     <para>
      Index-only scans returned column values with trailing spaces
      removed, which is not the expected behavior.  That happened because
      that's how the data was stored in the index.  This fix changes the
      code to store <type>char(<replaceable>N</replaceable>)</type> values
      with the expected amount of space padding.
      The behavior of such an index will not change immediately unless
      you <command>REINDEX</command> it; otherwise space-stripped values
      will be gradually replaced over time during updates.  Queries that
      do not use index-only scan plans will be unaffected in any case.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bd233bdd8] 2022-01-25 18:52:44 -0500
Branch: REL_14_STABLE [803f0b173] 2022-02-01 19:03:41 -0500
Branch: REL_13_STABLE [4d7d196ff] 2022-02-01 19:03:41 -0500
Branch: REL_12_STABLE [aa2215d6b] 2022-02-01 19:03:41 -0500
Branch: REL_11_STABLE [e41176bd6] 2022-02-01 19:03:41 -0500
Branch: REL_10_STABLE [a72c43012] 2022-02-01 19:03:41 -0500
-->
     <para>
      Change <application>configure</application> to use
      Python's <application>sysconfig</application> module, rather than
      the deprecated <application>distutils</application> module, to
      determine how to build PL/Python (Peter Eisentraut, Tom Lane, Andres
      Freund)
     </para>

     <para>
      With Python 3.10, this
      avoids <application>configure</application>-time warnings
      about <application>distutils</application> being deprecated and
      scheduled for removal in Python 3.12.  Presumably, once 3.12 is
      out, <literal>configure --with-python</literal> would fail
      altogether.  This future-proofing does come at a
      cost: <application>sysconfig</application> did not exist before
      Python 2.7, nor before 3.2 in the Python 3 branch, so it is no
      longer possible to build PL/Python against long-dead Python
      versions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [c89f40974] 2022-01-30 16:42:14 -0800
Branch: REL_14_STABLE [8484e3812] 2022-01-30 16:42:42 -0800
Branch: REL_13_STABLE [0dc0fe7b6] 2022-01-30 16:42:45 -0800
Branch: REL_12_STABLE [f173738d5] 2022-01-30 16:42:47 -0800
Branch: REL_11_STABLE [ad95a639a] 2022-01-30 16:42:49 -0800
Branch: REL_10_STABLE [2557a03f8] 2022-01-30 16:43:07 -0800
-->
     <para>
      Fix PL/Perl compile failure on Windows with Perl 5.28 and later
      (Victor Wagner)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [99e4d24a9] 2021-11-25 14:19:22 +0100
Branch: REL_14_STABLE [1cc13b83e] 2021-11-25 14:30:12 +0100
Branch: REL_13_STABLE [04875ae92] 2021-11-25 14:30:46 +0100
Branch: REL_12_STABLE [0d335cbd5] 2021-11-25 14:31:01 +0100
Branch: REL_11_STABLE [a83b1bab0] 2021-11-25 14:32:26 +0100
Branch: REL_10_STABLE [4339e10f0] 2021-11-25 14:32:43 +0100
-->
     <para>
      Fix PL/Python compile failure with Python 3.11 and later (Peter
      Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [b2265d305] 2021-11-24 13:03:23 +0900
Branch: REL_14_STABLE [0e681fa45] 2021-11-24 13:03:55 +0900
Branch: REL_13_STABLE [baef657d3] 2021-11-24 13:03:59 +0900
Branch: REL_12_STABLE [420d5e40b] 2021-11-24 13:04:03 +0900
Branch: REL_11_STABLE [1061e41ff] 2021-11-24 13:04:07 +0900
Branch: REL_10_STABLE [82881a9b9] 2021-11-24 13:04:12 +0900
-->
     <para>
      Add support for building with Visual Studio 2022 (Hans Buschmann)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [c3879a7b4] 2022-01-07 16:07:45 -0500
Branch: REL_14_STABLE [a7772e874] 2022-01-07 16:14:04 -0500
Branch: REL_13_STABLE [f3ded9c46] 2022-01-07 16:14:16 -0500
Branch: REL_12_STABLE [a4cde9153] 2022-01-07 16:14:23 -0500
Branch: REL_11_STABLE [c7fa0f55d] 2022-01-07 16:14:32 -0500
Branch: REL_10_STABLE [d897361c7] 2022-01-07 16:14:40 -0500
Branch: master [f80900be0] 2022-01-20 10:13:18 -0500
Branch: REL_14_STABLE [156a846d9] 2022-01-20 10:20:40 -0500
Branch: REL_13_STABLE [31680730e] 2022-01-20 10:20:51 -0500
Branch: REL_12_STABLE [22d8c2570] 2022-01-20 10:21:02 -0500
Branch: REL_11_STABLE [0a79feeca] 2022-01-20 10:21:12 -0500
Branch: REL_10_STABLE [a5bd14d93] 2022-01-20 10:21:28 -0500
-->
     <para>
      Allow the <filename>.bat</filename> wrapper scripts in our MSVC
      build system to be called without first changing into their
      directory (Anton Voloshin, Andrew Dunstan)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-9">
  <title>Release 12.9</title>

  <formalpara>
  <title>Release date:</title>
  <para>2021-11-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.8.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.9</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, note that installations using physical replication should
    update standby servers before the primary server, as explained in
    the third changelog entry below.
   </para>

   <para>
    Also, several bugs have been found that may have resulted in corrupted
    indexes, as explained in the next several changelog entries.  If any
    of those cases apply to you, it's recommended to reindex
    possibly-affected indexes after updating.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 12.6,
    see <xref linkend="release-12-6"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [28e241255] 2021-11-08 11:01:43 -0500
Branch: REL_14_STABLE [9d5a76b8d] 2021-11-08 11:01:43 -0500
Branch: REL_13_STABLE [e92ed93e8] 2021-11-08 11:01:43 -0500
Branch: REL_12_STABLE [d1bd26740] 2021-11-08 11:01:43 -0500
Branch: REL_11_STABLE [9394fb828] 2021-11-08 11:01:43 -0500
Branch: REL_10_STABLE [9ae0f1112] 2021-11-08 11:01:43 -0500
Branch: REL9_6_STABLE [046c2c846] 2021-11-08 11:01:43 -0500
-->
     <para>
      Make the server reject extraneous data after an SSL or GSS
      encryption handshake (Tom Lane)
     </para>

     <para>
      A man-in-the-middle with the ability to inject data into the TCP
      connection could stuff some cleartext data into the start of a
      supposedly encryption-protected database session.
      This could be abused to send faked SQL commands to the server,
      although that would only work if the server did not demand any
      authentication data.  (However, a server relying on SSL certificate
      authentication might well not do so.)
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Jacob Champion for reporting this problem.
      (CVE-2021-23214)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [160c02588] 2021-11-08 11:14:56 -0500
Branch: REL_14_STABLE [30547d791] 2021-11-08 11:14:56 -0500
Branch: REL_13_STABLE [844b31692] 2021-11-08 11:14:56 -0500
Branch: REL_12_STABLE [36bb95ef2] 2021-11-08 11:14:56 -0500
Branch: REL_11_STABLE [a021a1d2a] 2021-11-08 11:14:56 -0500
Branch: REL_10_STABLE [e65d9c8cd] 2021-11-08 11:14:56 -0500
Branch: REL9_6_STABLE [d83cdfdca] 2021-11-08 11:14:57 -0500
-->
     <para>
      Make <application>libpq</application> reject extraneous data after
      an SSL or GSS encryption handshake (Tom Lane)
     </para>

     <para>
      A man-in-the-middle with the ability to inject data into the TCP
      connection could stuff some cleartext data into the start of a
      supposedly encryption-protected database session.
      This could probably be abused to inject faked responses to the
      client's first few queries, although other details of libpq's
      behavior make that harder than it sounds.  A different line of
      attack is to exfiltrate the client's password, or other sensitive
      data that might be sent early in the session.  That has been shown
      to be possible with a server vulnerable to CVE-2021-23214.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Jacob Champion for reporting this problem.
      (CVE-2021-23222)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [ff9f111bc] 2021-09-29 11:21:51 -0300
Branch: REL_14_STABLE [64a8687a6] 2021-09-29 11:41:01 -0300
Branch: REL_13_STABLE [1d97d3d08] 2021-09-29 11:21:51 -0300
Branch: REL_12_STABLE [1df0a914d] 2021-09-29 11:21:51 -0300
Branch: REL_11_STABLE [cfedb279a] 2021-09-29 11:21:51 -0300
Branch: REL_10_STABLE [d9fe2cc7d] 2021-09-29 11:21:51 -0300
Branch: REL9_6_STABLE [148c6ee3b] 2021-09-29 11:21:51 -0300
Branch: master [d03bca4d7] 2021-09-30 10:01:03 -0300
Branch: REL_14_STABLE [e3731bac5] 2021-09-30 10:01:03 -0300
Branch: master [d186d233d] 2021-10-01 18:03:11 -0300
Branch: REL_14_STABLE [0ce67bce0] 2021-10-01 18:03:11 -0300
Branch: master [010e52337] 2021-10-13 18:49:27 -0300
Branch: REL_14_STABLE [79c7fe1af] 2021-10-13 18:49:27 -0300
Branch: REL_13_STABLE [2cdf97fd1] 2021-10-13 18:49:27 -0300
Branch: REL_12_STABLE [4b7abbe48] 2021-10-13 18:49:27 -0300
Branch: REL_11_STABLE [6287b8e19] 2021-10-13 18:49:27 -0300
Branch: REL_10_STABLE [41cce2326] 2021-10-13 18:49:27 -0300
Branch: REL9_6_STABLE [5ec87619b] 2021-10-13 18:49:27 -0300
Branch: REL_14_STABLE [494ec0037] 2021-11-01 13:07:23 -0300
Branch: REL_13_STABLE [17227825c] 2021-11-01 13:07:23 -0300
Branch: REL_12_STABLE [da782bc93] 2021-11-01 13:07:23 -0300
Branch: REL_11_STABLE [5ef210047] 2021-11-01 13:07:23 -0300
Branch: REL_10_STABLE [656312c2a] 2021-11-01 13:07:23 -0300
Branch: REL9_6_STABLE [99197701e] 2021-11-01 13:07:23 -0300
-->
     <para>
      Fix physical replication for cases where the primary crashes
      after shipping a WAL segment that ends with a partial WAL record
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      If the primary did not survive long enough to finish writing the
      rest of the incomplete WAL record, then the previous crash-recovery
      logic had it back up and overwrite WAL starting from the beginning
      of the incomplete WAL record.  This is problematic since standby
      servers may already have copies of that WAL segment.  They will then
      see an inconsistent next segment, and will not be able to recover
      without manual intervention.  To fix, do not back up over a WAL
      segment boundary when restarting after a crash.  Instead write a new
      type of WAL record at the start of the next WAL segment, informing
      readers that the incomplete WAL record will never be finished and
      must be disregarded.
     </para>

     <para>
      When applying this update, it's best to update standby servers
      before the primary, so that they will be ready to handle this new
      WAL record type if the primary happens to crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [3cd9c3b92] 2021-10-23 18:36:38 -0700
Branch: REL_14_STABLE [a5b9a0000] 2021-10-23 18:36:42 -0700
Branch: REL_13_STABLE [a9d0a5409] 2021-10-23 18:36:42 -0700
Branch: REL_12_STABLE [fe5d44a1d] 2021-10-23 18:36:42 -0700
Branch: REL_11_STABLE [df6158139] 2021-10-23 18:36:43 -0700
Branch: REL_10_STABLE [560124a37] 2021-10-23 18:36:43 -0700
Branch: REL9_6_STABLE [518493243] 2021-10-23 18:36:43 -0700
-->
     <para>
      Fix <command>CREATE INDEX CONCURRENTLY</command> to wait for
      the latest prepared transactions (Andrey Borodin)
     </para>

     <para>
      Rows inserted by just-prepared transactions might be omitted from
      the new index, causing queries relying on the index to miss such
      rows.  The previous fix for this type of problem failed to account
      for <command>PREPARE TRANSACTION</command> commands that were still
      in progress when <command>CREATE INDEX CONCURRENTLY</command>
      checked for them.  As before, in installations that have enabled
      prepared transactions (<varname>max_prepared_transactions</varname>
      &gt; 0), it's recommended to reindex any concurrently-built indexes
      in case this problem occurred when they were built.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [fdd965d07] 2021-10-23 18:36:38 -0700
Branch: REL_14_STABLE [dde966efb] 2021-10-23 18:36:42 -0700
Branch: REL_13_STABLE [2e33b4359] 2021-10-23 18:36:42 -0700
Branch: REL_12_STABLE [0869e53d3] 2021-10-23 18:36:42 -0700
Branch: REL_11_STABLE [5141e471b] 2021-10-23 18:36:43 -0700
Branch: REL_10_STABLE [db86746fd] 2021-10-23 18:36:43 -0700
Branch: REL9_6_STABLE [e428699cb] 2021-10-23 18:36:43 -0700
-->
     <para>
      Avoid race condition that can cause backends to fail to add entries
      for new rows to an index being built concurrently (Noah Misch,
      Andrey Borodin)
     </para>

     <para>
      While it's apparently rare in the field, this case could potentially
      affect any index built or reindexed with
      the <literal>CONCURRENTLY</literal> option.  It is recommended to
      reindex any such indexes to make sure they are correct.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ce773f230] 2021-09-02 17:24:41 -0400
Branch: REL_14_STABLE Release: REL_14_0 [23c6bc581] 2021-09-02 17:24:42 -0400
Branch: REL_13_STABLE [be2beadaf] 2021-09-02 17:24:42 -0400
Branch: REL_12_STABLE [a3bf13673] 2021-09-02 17:24:42 -0400
Branch: REL_11_STABLE [ad66373ea] 2021-09-02 17:24:42 -0400
Branch: REL_10_STABLE [2bb20e34c] 2021-09-02 17:24:42 -0400
Branch: REL9_6_STABLE [dea212e24] 2021-09-02 17:24:42 -0400
Branch: master [fd549145d] 2021-09-03 10:01:02 -0400
Branch: REL_14_STABLE Release: REL_14_0 [08b96a2b5] 2021-09-03 10:01:02 -0400
Branch: REL_13_STABLE [9089f1543] 2021-09-03 10:01:02 -0400
Branch: REL_12_STABLE [1fab33c0b] 2021-09-03 10:01:02 -0400
Branch: REL_11_STABLE [2836d57e4] 2021-09-03 10:01:02 -0400
Branch: master [b30cc0fd6] 2021-09-04 16:29:08 -0400
Branch: REL_14_STABLE Release: REL_14_0 [718978d9d] 2021-09-04 16:29:08 -0400
Branch: REL_13_STABLE [2c0dd669c] 2021-09-04 16:29:08 -0400
Branch: REL_12_STABLE [fd295d0c6] 2021-09-04 16:29:08 -0400
Branch: REL_11_STABLE [8782a8452] 2021-09-04 16:29:08 -0400
Branch: REL_10_STABLE [70354dd56] 2021-09-04 16:29:08 -0400
Branch: REL9_6_STABLE [a5e8f7b37] 2021-09-04 16:29:08 -0400
-->
     <para>
      Fix <type>float4</type> and <type>float8</type> hash functions to
      produce uniform results for NaNs (Tom Lane)
     </para>

     <para>
      Since <productname>PostgreSQL</productname>'s floating-point types
      deem all NaNs to be equal, it's important for the hash functions to
      produce the same hash code for all bit-patterns that are NaNs
      according to the IEEE 754 standard.  This failed to happen before,
      meaning that hash indexes and hash-based query plans might produce
      incorrect results for non-canonical NaN values.
      (<literal>'-NaN'::float8</literal> is one way to produce such a
      value on most machines.)  It is advisable to reindex hash indexes
      on floating-point columns, if there is any possibility that they
      might contain such values.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [97ddda8a8] 2021-08-27 23:33:23 -0700
Branch: REL_14_STABLE Release: REL_14_0 [5513c09c8] 2021-08-27 23:33:27 -0700
Branch: REL_13_STABLE [b18669f5e] 2021-08-27 23:33:27 -0700
Branch: REL_12_STABLE [a494f1023] 2021-08-27 23:34:03 -0700
Branch: REL_11_STABLE [6ebd2426b] 2021-08-27 23:34:22 -0700
Branch: REL_10_STABLE [f11c1bb17] 2021-08-27 23:42:53 -0700
Branch: REL9_6_STABLE [978998dbd] 2021-08-27 23:44:55 -0700
-->
     <para>
      Prevent data loss during crash recovery of <command>CREATE
      TABLESPACE</command>, when <varname>wal_level</varname>
      = <literal>minimal</literal> (Noah Misch)
     </para>

     <para>
      If the server crashed between <command>CREATE TABLESPACE</command>
      and the next checkpoint, replay would fully remove the contents of
      the new tablespace's directory, relying on subsequent WAL replay
      to restore everything within that directory.  This interacts badly
      with optimizations that skip writing WAL (one example
      is <command>COPY</command> into a just-created table).  Such
      optimizations are applied only when <varname>wal_level</varname>
      is <literal>minimal</literal>, which is not the default in v10 and
      later.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [d6f1e16c8] 2021-10-18 19:08:25 -0300
Branch: REL_14_STABLE [72d064217] 2021-10-18 19:08:25 -0300
Branch: REL_13_STABLE [fe35528a5] 2021-10-18 19:08:25 -0300
Branch: REL_12_STABLE [8b26be8a3] 2021-10-18 19:08:25 -0300
Branch: REL_11_STABLE [b703b7d31] 2021-10-18 19:08:25 -0300
Branch: REL_10_STABLE [d36bdc4e9] 2021-10-18 19:08:25 -0300
-->
     <para>
      Ensure that the relation cache is invalidated for a table being
      attached to or detached from a partitioned table (Amit Langote,
      &Aacute;lvaro Herrera)
     </para>

     <para>
      This oversight could allow misbehavior of subsequent inserts/updates
      addressed directly to the partition, but only in currently-existing
      sessions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [8bd534274] 2021-09-08 11:50:37 +0530
Branch: REL_14_STABLE Release: REL_14_0 [8db27fbc1] 2021-09-08 12:08:29 +0530
Branch: REL_13_STABLE [ddfc7299d] 2021-09-08 12:14:59 +0530
Branch: REL_12_STABLE [2eb09f27d] 2021-09-08 12:16:15 +0530
Branch: REL_11_STABLE [96e38fa5e] 2021-09-08 11:20:42 +0530
Branch: REL_10_STABLE [28cde380c] 2021-09-08 11:23:01 +0530
-->
     <para>
      Ensure that the relation cache is invalidated when creating or
      dropping a <literal>FOR ALL TABLES</literal> publication
      (Hou Zhijie, Vignesh C)
     </para>

     <para>
      This oversight could lead to improper replication behavior until all
      currently-existing sessions have exited.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5c056b0c2] 2021-08-06 17:32:54 -0400
Branch: REL_14_STABLE Release: REL_14_0 [e5f6493e3] 2021-08-06 17:32:54 -0400
Branch: REL_13_STABLE [dede14399] 2021-09-20 11:48:52 -0400
Branch: REL_12_STABLE [f230614da] 2021-09-20 11:48:52 -0400
Branch: REL_11_STABLE [914e54501] 2021-09-20 11:48:52 -0400
Branch: REL_10_STABLE [923b7efc2] 2021-09-20 11:48:52 -0400
Branch: REL9_6_STABLE [183b3aced] 2021-09-20 11:48:52 -0400
-->
     <para>
      Don't discard a cast to the same type with unspecified type modifier
      (Tom Lane)
     </para>

     <para>
      For example, if column <literal>f1</literal> is of
      type <literal>numeric(18,3)</literal>, the parser used to simply
      discard a cast like <literal>f1::numeric</literal>, on the grounds
      that it would have no run-time effect.  That's true, but the exposed
      type of the expression should still be considered to be
      plain <literal>numeric</literal>,
      not <literal>numeric(18,3)</literal>.  This is important for
      correctly resolving the type of larger constructs, such
      as recursive <literal>UNION</literal>s.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3e310d837] 2021-10-19 13:54:45 -0400
Branch: REL_14_STABLE [04dae19f4] 2021-10-19 13:54:45 -0400
Branch: REL_13_STABLE [30e61a8cd] 2021-10-19 13:54:46 -0400
Branch: REL_12_STABLE [ae7b1dd59] 2021-10-19 13:54:46 -0400
Branch: REL_11_STABLE [0d08c279b] 2021-10-19 13:54:46 -0400
-->
     <para>
      Fix updates of element fields in arrays of domain over composite
      (Tom Lane)
     </para>

     <para>
      A command such as <literal>UPDATE tab SET fld[1].subfld =
      val</literal> failed if the array's elements were domains rather
      than plain composites.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [db2760a84] 2021-09-03 16:39:03 -0400
Branch: REL_14_STABLE Release: REL_14_0 [2cc018ba8] 2021-09-03 16:39:04 -0400
Branch: REL_13_STABLE [132be6000] 2021-09-03 16:38:55 -0400
Branch: REL_12_STABLE [9046a0536] 2021-09-03 16:38:55 -0400
Branch: REL_11_STABLE [9ebe2852e] 2021-09-03 16:38:55 -0400
Branch: REL_10_STABLE [5d7c6b6c8] 2021-09-03 16:38:55 -0400
-->
     <para>
      Disallow creating an ICU collation if the current database's
      encoding won't support it (Tom Lane)
     </para>

     <para>
      Previously this was allowed, but then the collation could not be
      referenced because of the way collation lookup works; you could not
      use the collation, nor even drop it.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [e54a758d2] 2021-10-06 13:16:51 +0100
Branch: REL_14_STABLE [8e26b868d] 2021-10-06 13:19:25 +0100
Branch: REL_13_STABLE [9ab94ccb1] 2021-10-06 13:20:23 +0100
Branch: REL_12_STABLE [676218034] 2021-10-06 13:21:27 +0100
Branch: REL_11_STABLE [b2a0f1673] 2021-10-06 13:22:33 +0100
Branch: REL_10_STABLE [4853baaac] 2021-10-06 13:23:13 +0100
Branch: REL9_6_STABLE [0de8f9bc8] 2021-10-06 13:24:22 +0100
-->
     <para>
      Fix corner-case loss of precision in
      numeric <function>power()</function> (Dean Rasheed)
     </para>

     <para>
      The result could be inaccurate when the first argument is very close
      to 1.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [65dc30ced] 2021-08-24 16:37:26 -0400
Branch: REL_14_STABLE Release: REL_14_0 [244dd7992] 2021-08-24 16:37:27 -0400
Branch: REL_13_STABLE [071146184] 2021-08-24 16:37:27 -0400
Branch: REL_12_STABLE [92620e82f] 2021-08-24 16:37:27 -0400
Branch: REL_11_STABLE [3ebd32e70] 2021-08-24 16:37:27 -0400
Branch: REL_10_STABLE [062c4c791] 2021-08-24 16:37:27 -0400
Branch: REL9_6_STABLE [7e75fe390] 2021-08-24 16:37:27 -0400
-->
     <para>
      Avoid regular expression errors with capturing parentheses
      inside <literal>{0}</literal> (Tom Lane)
     </para>

     <para>
      Regular expressions like <literal>(.){0}...\1</literal> drew
      <quote>invalid backreference number</quote>.  Other regexp engines
      such as Perl don't complain, though, and for that matter ours
      doesn't either in some closely related cases.  Worse, it could throw
      an assertion failure instead.  Fix it so that no error is thrown and
      instead the back-reference is silently deemed to never match.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9bbf6f734] 2021-08-23 17:41:07 -0400
Branch: REL_14_STABLE Release: REL_14_0 [779557bd2] 2021-08-23 17:41:07 -0400
Branch: REL_13_STABLE [9a327179c] 2021-08-23 17:41:07 -0400
Branch: REL_12_STABLE [b9521a1f9] 2021-08-23 17:41:07 -0400
Branch: REL_11_STABLE [08e080756] 2021-08-23 17:41:07 -0400
Branch: REL_10_STABLE [df87b7c44] 2021-08-23 17:41:07 -0400
Branch: REL9_6_STABLE [d90e14414] 2021-08-23 17:41:07 -0400
-->
     <para>
      Prevent regular expression back-references from sometimes matching
      when they shouldn't (Tom Lane)
     </para>

     <para>
      The regexp engine was careless about clearing match data
      for capturing parentheses after rejecting a partial match.  This
      could allow a later back-reference to match in places where it
      should fail for lack of a defined referent.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [facce1da9] 2021-08-20 14:19:04 -0400
Branch: REL_14_STABLE Release: REL_14_0 [57a2d4a1b] 2021-08-20 14:19:04 -0400
Branch: REL_13_STABLE [b30f7f399] 2021-08-20 14:19:04 -0400
Branch: REL_12_STABLE [adbfde3db] 2021-08-20 14:19:04 -0400
Branch: REL_11_STABLE [9610852ab] 2021-08-20 14:19:04 -0400
Branch: REL_10_STABLE [e0f2acf26] 2021-08-20 14:19:04 -0400
Branch: REL9_6_STABLE [cafebd663] 2021-08-20 14:19:04 -0400
-->
     <para>
      Fix regular expression performance bug with back-references inside
      iteration nodes (Tom Lane)
     </para>

     <para>
      Incorrect back-tracking logic could result in exponential time spent
      looking for a match.  Fortunately the problem is masked in most
      cases by other optimizations.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_14_STABLE Release: REL_14_0 [599c73a91] 2021-09-06 11:29:52 -0400
Branch: REL_13_STABLE [d8a266c5e] 2021-09-06 11:29:52 -0400
Branch: REL_12_STABLE [eb3c8d248] 2021-09-06 11:29:52 -0400
Branch: REL_11_STABLE [90b4647f6] 2021-09-06 11:29:52 -0400
Branch: REL_10_STABLE [b28c862a6] 2021-09-06 11:29:52 -0400
Branch: REL9_6_STABLE [5907c3818] 2021-09-06 11:29:52 -0400
-->
     <para>
      Fix incorrect results from <literal>AT TIME ZONE</literal> applied
      to a <type>time with time zone</type> value (Tom Lane)
     </para>

     <para>
      The results were incorrect if the target time zone was specified by
      a dynamic timezone abbreviation (that is, one that is defined as
      equivalent to a full time zone name, rather than a fixed UTC offset).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a21049fd3] 2021-09-17 15:41:16 -0400
Branch: REL_14_STABLE Release: REL_14_0 [4d5b4483d] 2021-09-17 15:41:16 -0400
Branch: REL_13_STABLE [e0b0d1eab] 2021-09-17 15:41:16 -0400
Branch: REL_12_STABLE [febe013ca] 2021-09-17 15:41:16 -0400
-->
     <para>
      Fix mistranslation of PlaceHolderVars to inheritance child relations
      (Tom Lane)
     </para>

     <para>
      This error could result in assertion failures, or in mis-planning of
      queries having partitioned or inherited tables on the nullable side
      of an outer join.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8c1144ba7] 2021-10-01 14:59:35 -0400
Branch: REL_14_STABLE [a54509bfd] 2021-10-01 14:59:35 -0400
Branch: REL_13_STABLE [7adbe186f] 2021-10-01 14:59:35 -0400
Branch: REL_12_STABLE [334fb8c3d] 2021-10-01 14:59:35 -0400
Branch: REL_11_STABLE [5863d348a] 2021-10-01 14:59:35 -0400
Branch: REL_10_STABLE [f951ea3a2] 2021-10-01 14:59:35 -0400
-->
     <para>
      Avoid using MCV-only statistics to estimate the range of a column
      (Tom Lane)
     </para>

     <para>
      There are corner cases in which <command>ANALYZE</command> will
      build a most-common-values (MCV) list but not a histogram, even
      though the MCV list does not account for all the observed values.
      In such cases, keep the planner from using the MCV list alone to
      estimate the range of column values.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7b5d4c29e] 2021-10-01 11:10:12 -0400
Branch: REL_14_STABLE [e6adaa179] 2021-10-01 11:10:12 -0400
Branch: REL_13_STABLE [04ef2021e] 2021-10-01 11:10:12 -0400
Branch: REL_12_STABLE [cded2c460] 2021-10-01 11:10:12 -0400
Branch: REL_11_STABLE [5abbda985] 2021-10-01 11:10:12 -0400
-->
     <para>
      Fix restoration of a Portal's snapshot inside a subtransaction
      (Bertrand Drouvot)
     </para>

     <para>
      If a procedure commits or rolls back a transaction, and then its
      next significant action is inside a new subtransaction, snapshot
      management went wrong, leading to a dangling pointer and probable
      crash.  A typical example in PL/pgSQL is a <literal>COMMIT</literal>
      immediately followed by a <literal>BEGIN ... EXCEPTION</literal>
      block that performs a query.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [409f9ca44] 2021-10-18 11:55:42 +0900
Branch: REL_14_STABLE [5b353aaff] 2021-10-18 11:56:48 +0900
Branch: REL_13_STABLE [8f4fe8d7f] 2021-10-18 11:56:52 +0900
Branch: REL_12_STABLE [a207b8521] 2021-10-18 11:56:54 +0900
Branch: REL_11_STABLE [506aa1f71] 2021-10-18 11:56:57 +0900
Branch: REL_10_STABLE [d1a6a08df] 2021-10-18 11:57:02 +0900
Branch: REL9_6_STABLE [f49bf8263] 2021-10-18 11:57:07 +0900
-->
     <para>
      Clean up correctly if a transaction fails after exporting its
      snapshot (Dilip Kumar)
     </para>

     <para>
      This oversight would only cause a problem if the same session
      attempted to export a snapshot again.  The most likely scenario for
      that is creation of a replication slot (followed by rollback)
      and then creation of another replication slot.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [05e6e78c1] 2021-11-06 19:13:58 +0300
Branch: REL_14_STABLE [b0f6bd48f] 2021-11-06 19:13:53 +0300
Branch: REL_13_STABLE [e1fee28a0] 2021-11-06 18:34:19 +0300
Branch: REL_12_STABLE [8f779a1a3] 2021-11-06 18:34:21 +0300
Branch: REL_11_STABLE [691c0df73] 2021-11-06 18:34:23 +0300
Branch: REL_10_STABLE [774d00573] 2021-11-06 18:34:26 +0300
Branch: REL9_6_STABLE [7381b79ad] 2021-11-06 18:34:31 +0300
-->
     <para>
      Prevent wraparound of overflowed-subtransaction tracking on standby
      servers (Kyotaro Horiguchi, Alexander Korotkov)
     </para>

     <para>
      This oversight could cause significant performance degradation
      (manifesting as excessive SubtransSLRU traffic) on standby servers.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [8a4237908] 2021-10-04 14:05:20 +0900
Branch: REL_14_STABLE [828f7f000] 2021-10-04 14:05:48 +0900
Branch: REL_13_STABLE [194e535a0] 2021-10-04 14:05:52 +0900
Branch: REL_12_STABLE [3c3f118d5] 2021-10-04 14:05:55 +0900
Branch: REL_11_STABLE [0a561d4d0] 2021-10-04 14:05:59 +0900
Branch: REL_10_STABLE [8a6a1fe07] 2021-10-04 14:06:03 +0900
Branch: REL9_6_STABLE [e2b2a9e1c] 2021-10-04 14:06:09 +0900
-->
     <para>
      Ensure that prepared transactions are properly accounted for during
      promotion of a standby server (Michael Paquier, Andres Freund)
     </para>

     <para>
      There was a narrow window where a prepared transaction could be
      omitted from a snapshot taken by a concurrently-running session.
      If that session then used the snapshot to perform data updates,
      erroneous results or data corruption could occur.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c1b7a6c27] 2021-09-10 13:18:32 -0400
Branch: REL_14_STABLE Release: REL_14_0 [d844cd75a] 2021-09-10 13:18:32 -0400
Branch: REL_13_STABLE [fa5d0415f] 2021-09-10 13:18:32 -0400
Branch: REL_12_STABLE [ba408fc96] 2021-09-10 13:18:32 -0400
Branch: REL_11_STABLE [9ea8d3d24] 2021-09-10 13:18:32 -0400
-->
     <para>
      Refuse to rewind a cursor marked <literal>NO SCROLL</literal>
      if it has been held over from a previous transaction due
      to the <literal>WITH HOLD</literal> option (Tom Lane)
     </para>

     <para>
      We have long forbidden fetching backwards from a <literal>NO
      SCROLL</literal> cursor, but for historical reasons the prohibition
      didn't extend to cases in which we rewind the query altogether and
      then re-fetch forwards.  That exception leads to inconsistencies,
      particularly for held-over cursors which may not have stored all the
      data necessary to rewind.  Disallow rewinding for non-scrollable
      held-over cursors to block the worst inconsistencies.  (v15 will
      remove the exception altogether.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cba79a163] 2021-09-09 13:36:44 -0400
Branch: REL_14_STABLE Release: REL_14_0 [b7056c0a2] 2021-09-09 13:36:44 -0400
Branch: REL_13_STABLE [d8d93bc8b] 2021-09-09 13:36:31 -0400
Branch: REL_12_STABLE [2e75e969c] 2021-09-09 13:36:31 -0400
Branch: REL_11_STABLE [7813451c2] 2021-09-09 13:36:31 -0400
-->
     <para>
      Fix possible failure while saving a <literal>WITH HOLD</literal>
      cursor at transaction end, if it had already been read to completion
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8481f9989] 2021-09-09 11:45:48 -0400
Branch: REL_14_STABLE Release: REL_14_0 [7430c7742] 2021-09-09 11:45:48 -0400
Branch: REL_13_STABLE [04118de78] 2021-09-09 11:45:48 -0400
Branch: REL_12_STABLE [a7a73ce30] 2021-09-09 11:45:48 -0400
Branch: REL_11_STABLE [1a23b669d] 2021-09-09 11:45:48 -0400
Branch: REL_10_STABLE [ca1dd6234] 2021-09-09 11:45:48 -0400
Branch: REL9_6_STABLE [cc4de2bba] 2021-09-09 11:45:48 -0400
-->
     <para>
      Fix detection of a relation that has grown to the maximum allowed
      length (Tom Lane)
     </para>

     <para>
      An attempt to extend a table or index past the limit of 2^32-1
      blocks was rejected, but not soon enough to prevent inconsistent
      internal state from being created.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [362e2dcc4] 2021-09-08 12:05:47 -0400
Branch: REL_14_STABLE Release: REL_14_0 [03d01d746] 2021-09-08 12:05:43 -0400
Branch: REL_13_STABLE [cbba6ba3a] 2021-09-08 12:05:43 -0400
Branch: REL_12_STABLE [1fedbcc7a] 2021-09-08 12:05:43 -0400
Branch: REL_11_STABLE [882b7e728] 2021-09-08 12:05:43 -0400
Branch: REL_10_STABLE [9de082399] 2021-09-08 12:05:43 -0400
Branch: REL9_6_STABLE [595ab8a54] 2021-09-08 12:05:43 -0400
-->
     <para>
      Correctly track the presence of data-modifying CTEs when expanding
      a <literal>DO INSTEAD</literal> rule (Greg Nancarrow, Tom Lane)
     </para>

     <para>
      The previous failure to do this could lead to problems such as
      unsafely choosing a parallel plan.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [5be8ce82e] 2021-08-31 18:33:38 +0200
Branch: REL_14_STABLE Release: REL_14_0 [a371a5ba3] 2021-08-31 18:36:06 +0200
Branch: REL_13_STABLE [1fe1a04af] 2021-08-31 18:38:11 +0200
Branch: REL_12_STABLE [6c8b98669] 2021-08-31 18:40:09 +0200
Branch: REL_11_STABLE [b46ff4b50] 2021-08-31 18:42:11 +0200
Branch: REL_10_STABLE [bfb732c0e] 2021-08-31 18:44:36 +0200
Branch: master [628bc9d13] 2021-08-31 19:31:10 +0200
Branch: REL_14_STABLE Release: REL_14_0 [4090ff2a9] 2021-08-31 19:32:32 +0200
Branch: REL_13_STABLE [c8213aa94] 2021-08-31 19:36:03 +0200
Branch: REL_12_STABLE [5f8dd5dc1] 2021-08-31 19:41:58 +0200
Branch: REL_11_STABLE [bce24d1ed] 2021-08-31 19:42:14 +0200
Branch: REL_10_STABLE [6963e723f] 2021-08-31 19:44:30 +0200
-->
     <para>
      Fix incorrect reporting of permissions failures on extended
      statistics objects (Tomas Vondra)
     </para>

     <para>
      The code typically produced <quote>cache lookup error</quote> rather
      than the intended message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [a780b2fcc] 2021-08-25 08:32:04 -0400
Branch: REL_14_STABLE Release: REL_14_0 [11c123988] 2021-08-25 08:33:53 -0400
Branch: REL_13_STABLE [bc062cb93] 2021-08-25 08:40:52 -0400
Branch: REL_12_STABLE [f4b77e82e] 2021-08-25 08:45:00 -0400
Branch: REL_11_STABLE [198cf81e2] 2021-08-25 08:48:01 -0400
Branch: REL_10_STABLE [96f6ef9fe] 2021-08-25 08:55:52 -0400
-->
     <para>
      Fix incorrect snapshot handling in parallel workers (Greg Nancarrow)
     </para>

     <para>
      This oversight could lead to misbehavior in parallel queries if the
      transaction isolation level is less than <literal>REPEATABLE
      READ</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [29b590547] 2021-08-25 09:53:07 +0530
Branch: REL_14_STABLE Release: REL_14_0 [9d7a80ce0] 2021-08-25 10:10:50 +0530
Branch: REL_13_STABLE [794025eff] 2021-08-25 09:23:27 +0530
Branch: REL_12_STABLE [e35705f54] 2021-08-25 09:32:56 +0530
Branch: REL_11_STABLE [bfdbda24b] 2021-08-25 09:43:33 +0530
-->
     <para>
      Fix logical decoding to correctly ignore toast-table changes for
      transient tables (Bertrand Drouvot)
     </para>

     <para>
      Logical decoding normally ignores changes in transient tables such
      as those created during an <command>ALTER TABLE</command> heap
      rewrite.  But that filtering wasn't applied to the associated toast
      table if any, leading to possible errors when rewriting a table
      that's being published.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [596ba75cb] 2021-09-09 23:56:57 +0900
Branch: REL_14_STABLE Release: REL_14_0 [b5ec22bf5] 2021-09-09 23:58:05 +0900
Branch: REL_13_STABLE [dd9b3fced] 2021-09-09 23:58:26 +0900
Branch: REL_12_STABLE [466535254] 2021-09-09 23:58:54 +0900
Branch: REL_11_STABLE [aacb3cfaf] 2021-09-09 23:59:19 +0900
Branch: REL_10_STABLE [f77489046] 2021-09-09 23:59:40 +0900
Branch: REL9_6_STABLE [61e2aa2db] 2021-09-10 00:00:06 +0900
-->
     <para>
      Ensure that walreceiver processes create all required archive
      notification files before exiting (Fujii Masao)
     </para>

     <para>
      If a walreceiver exited exactly at a WAL segment boundary, it failed
      to make a notification file for the last-received segment, thus
      delaying archiving of that segment on the standby.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8d2d6ec77] 2021-08-19 12:12:35 -0400
Branch: REL_14_STABLE Release: REL_14_0 [464900393] 2021-08-19 12:12:35 -0400
Branch: REL_13_STABLE [7fa367d96] 2021-08-19 12:12:35 -0400
Branch: REL_12_STABLE [0c13ee198] 2021-08-19 12:12:35 -0400
Branch: REL_11_STABLE [fbc1eed8a] 2021-08-19 12:12:35 -0400
Branch: REL_10_STABLE [2739a2810] 2021-08-19 12:12:36 -0400
Branch: REL9_6_STABLE [cc7fae5c2] 2021-08-19 12:12:36 -0400
-->
     <para>
      Avoid trying to lock the <literal>OLD</literal>
      and <literal>NEW</literal> pseudo-relations in a rule
      that uses <literal>SELECT FOR UPDATE</literal>
      (Masahiko Sawada, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2313dda9d] 2021-08-18 18:12:51 -0400
Branch: REL_14_STABLE Release: REL_14_0 [61f9dae2c] 2021-08-18 18:12:51 -0400
Branch: REL_13_STABLE [ecd4dd9f1] 2021-08-18 18:12:51 -0400
Branch: REL_12_STABLE [eb2f59b34] 2021-08-18 18:12:51 -0400
Branch: REL_11_STABLE [a65319f09] 2021-08-18 18:12:51 -0400
Branch: REL_10_STABLE [82ad7ecb4] 2021-08-18 18:12:51 -0400
Branch: REL9_6_STABLE [c09f56fed] 2021-08-18 18:12:51 -0400
-->
     <para>
      Fix parser's processing of aggregate <literal>FILTER</literal>
      clauses (Tom Lane)
     </para>

     <para>
      If the <literal>FILTER</literal> expression is a plain boolean column,
      the semantic level of the aggregate could be mis-determined, leading
      to not-per-spec behavior.  If the <literal>FILTER</literal>
      expression is itself a boolean-returning aggregate, an error should
      be thrown but was not, likely resulting in a crash at execution.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [c2c618ff1] 2021-10-19 19:08:45 -0300
Branch: REL_14_STABLE [3ce3fb2f7] 2021-10-19 19:08:45 -0300
Branch: REL_13_STABLE [842fe6123] 2021-10-19 19:08:45 -0300
Branch: REL_12_STABLE [6c8d1c197] 2021-10-19 19:08:45 -0300
Branch: master [cd124d205] 2021-10-20 13:05:42 -0300
Branch: REL_14_STABLE [718278855] 2021-10-20 13:05:42 -0300
Branch: REL_13_STABLE [a73a3671d] 2021-10-20 13:05:42 -0300
Branch: REL_12_STABLE [3c8c49945] 2021-10-20 13:05:42 -0300
-->
     <para>
      Ensure that the correct lock level is used when renaming a table
      (Nathan Bossart, &Aacute;lvaro Herrera)
     </para>

     <para>
      For historical reasons, <command>ALTER INDEX ... RENAME</command>
      can be applied to any sort of relation.  The lock level required to
      rename an index is lower than that required to rename a table or
      other kind of relation, but the code got this wrong and would use
      the weaker lock level whenever the command is spelled <command>ALTER
      INDEX</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [edb4d95dd] 2021-09-13 18:26:15 -0700
Branch: REL_14_STABLE Release: REL_14_0 [4e86887e0] 2021-09-13 18:15:28 -0700
Branch: REL_13_STABLE [c49e6f9d9] 2021-09-13 18:26:18 -0700
Branch: REL_12_STABLE [43849b65f] 2021-09-13 18:26:18 -0700
Branch: REL_11_STABLE [dccffd9a2] 2021-09-13 18:26:18 -0700
-->
     <para>
      Avoid trying to clean up LLVM state after an error within LLVM
      (Andres Freund, Justin Pryzby)
     </para>

     <para>
      This prevents a likely crash during backend exit after a fatal LLVM
      error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [d74b54b3d] 2021-11-05 12:29:35 -0300
Branch: REL_14_STABLE [02e20bb2d] 2021-11-05 12:29:35 -0300
Branch: REL_13_STABLE [bf5cdcfd5] 2021-11-05 12:29:34 -0300
Branch: REL_12_STABLE [3eff168a2] 2021-11-05 12:29:34 -0300
Branch: REL_11_STABLE [92224e470] 2021-11-05 12:29:34 -0300
Branch: REL_10_STABLE [58b600f64] 2021-11-05 12:29:34 -0300
Branch: REL9_6_STABLE [e0eaeafd6] 2021-11-05 12:29:35 -0300
-->
     <para>
      Avoid null-pointer-dereference crash when dropping a role that owns
      objects being dropped concurrently (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [6b1b405eb] 2021-11-03 10:52:38 +0200
Branch: REL_14_STABLE [4ebd740cd] 2021-11-03 10:54:33 +0200
Branch: REL_13_STABLE [07070c008] 2021-11-03 10:54:36 +0200
Branch: REL_12_STABLE [11a399f9c] 2021-11-03 10:54:39 +0200
Branch: REL_11_STABLE [6bf00da11] 2021-11-03 10:54:42 +0200
Branch: REL_10_STABLE [7b55bb892] 2021-11-03 11:09:08 +0200
Branch: REL9_6_STABLE [8f32afee0] 2021-11-03 11:15:02 +0200
Branch: master [d5ab0681b] 2021-11-03 19:38:17 +0200
Branch: REL_14_STABLE [f4e3b6271] 2021-11-03 19:41:35 +0200
Branch: REL_13_STABLE [b7299b664] 2021-11-03 19:41:38 +0200
Branch: REL_12_STABLE [7dc9a310e] 2021-11-03 19:41:41 +0200
Branch: REL_11_STABLE [b110af5f7] 2021-11-03 19:41:44 +0200
Branch: REL_10_STABLE [245799d39] 2021-11-03 19:41:46 +0200
Branch: REL9_6_STABLE [71aeaf245] 2021-11-03 19:41:49 +0200
-->
     <para>
      Prevent <quote>snapshot reference leak</quote> warning
      when <function>lo_export()</function> or a related function fails
      (Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3778bcb39] 2021-08-27 19:53:05 -0400
Branch: REL_14_STABLE Release: REL_14_0 [e84d4810c] 2021-08-27 19:53:06 -0400
Branch: REL_13_STABLE [dbb239d51] 2021-08-27 19:42:42 -0400
Branch: REL_12_STABLE [187b5fea9] 2021-08-27 19:42:42 -0400
Branch: REL_11_STABLE [7c1b0f4c3] 2021-08-27 19:42:42 -0400
Branch: REL_10_STABLE [6a787c83c] 2021-08-27 19:42:42 -0400
Branch: REL9_6_STABLE [9e959f7ed] 2021-08-27 19:42:42 -0400
-->
     <para>
      Ensure that scans of SP-GiST indexes are counted in the statistics
      views (Tom Lane)
     </para>

     <para>
      Incrementing the number-of-index-scans counter was overlooked in the
      SP-GiST code, although per-tuple counters were advanced correctly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [e4ba1005c] 2021-08-16 12:10:22 +0900
Branch: REL_14_STABLE Release: REL_14_0 [f83d80ea1] 2021-08-16 12:11:49 +0900
Branch: REL_13_STABLE [7f0873f32] 2021-08-16 12:11:53 +0900
Branch: REL_12_STABLE [84c1bac57] 2021-08-16 12:11:56 +0900
Branch: REL_11_STABLE [d392e86fa] 2021-08-16 12:11:59 +0900
Branch: REL_10_STABLE [024fd44e0] 2021-08-16 12:12:02 +0900
Branch: REL9_6_STABLE [942416f4b] 2021-08-16 12:12:09 +0900
-->
     <para>
      Recalculate relevant wait intervals
      if <varname>recovery_min_apply_delay</varname> is changed during
      recovery (Soumyadeep Chakraborty, Ashwin Agrawal)
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [37450f2ca] 2021-08-13 16:41:26 +1200
Branch: REL_14_STABLE Release: REL_14_0 [dc23c77d0] 2021-08-13 16:41:56 +1200
Branch: REL_13_STABLE [4873da79d] 2021-08-13 16:42:35 +1200
Branch: REL_12_STABLE [75d8fe818] 2021-08-13 16:43:13 +1200
Branch: REL_11_STABLE [5a6b0f21e] 2021-08-13 16:43:46 +1200
Branch: REL_10_STABLE [4874886b4] 2021-08-13 16:44:18 +1200
-->
     <para>
      Fix infinite loop if a <filename>simplehash.h</filename> hash table
      reaches 2^32 elements (Yura Sokolov)
     </para>

     <para>
      It seems unlikely that this bug has been hit in practice, as it
      would require <varname>work_mem</varname> settings of hundreds of
      gigabytes for existing uses of <filename>simplehash.h</filename>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [83772cc78] 2021-09-23 18:05:10 +0200
Branch: REL_14_STABLE Release: REL_14_0 [bb7628e55] 2021-09-23 18:22:29 +0200
Branch: REL_13_STABLE [b564eb018] 2021-09-23 18:33:59 +0200
Branch: REL_12_STABLE [16d394c05] 2021-09-23 18:41:55 +0200
Branch: REL_11_STABLE [ac7290a20] 2021-09-23 18:48:03 +0200
Branch: REL_10_STABLE [3aac99068] 2021-09-23 18:54:30 +0200
Branch: master [ad8a166ca] 2021-09-23 18:13:36 +0200
Branch: REL_14_STABLE Release: REL_14_0 [abb2f9144] 2021-09-23 18:25:37 +0200
Branch: REL_13_STABLE [c0386f403] 2021-09-23 18:34:01 +0200
Branch: REL_12_STABLE [4185632e9] 2021-09-23 18:43:05 +0200
Branch: REL_11_STABLE [4487a7def] 2021-09-23 18:48:58 +0200
Branch: REL_10_STABLE [d77e085af] 2021-09-23 18:55:22 +0200
-->
     <para>
      Reduce memory consumption during calculation of extended statistics
      (Justin Pryzby, Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [8781b0ce2] 2021-10-26 12:54:55 +1300
Branch: REL_14_STABLE [181361a0c] 2021-10-26 13:09:00 +1300
Branch: REL_13_STABLE [24b7cf8a5] 2021-10-26 13:04:40 +1300
Branch: REL_12_STABLE [8fef901e3] 2021-10-26 13:01:52 +1300
-->
     <para>
      Disallow setting <varname>huge_pages</varname>
      to <literal>on</literal> when <varname>shared_memory_type</varname>
      is <literal>sysv</literal> (Thomas Munro)
     </para>

     <para>
      Previously, this setting was accepted, but it did nothing for lack
      of any implementation.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [fa703b317] 2021-09-13 13:23:50 +0900
Branch: REL_14_STABLE Release: REL_14_0 [cc057fb31] 2021-09-13 13:24:04 +0900
Branch: REL_13_STABLE [b589d212f] 2021-09-13 13:24:20 +0900
Branch: REL_12_STABLE [b34dcf87f] 2021-09-13 13:24:27 +0900
Branch: REL_11_STABLE [b6a10ff4a] 2021-09-13 13:24:35 +0900
Branch: REL_10_STABLE [83a3737a6] 2021-09-13 13:24:47 +0900
Branch: REL9_6_STABLE [3768c468d] 2021-09-13 13:24:56 +0900
-->
     <para>
      Fix <application>ecpg</application> to recover correctly
      after <function>malloc()</function> failure while establishing a
      connection (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4476bcb87] 2021-09-21 19:06:53 -0400
Branch: REL_14_STABLE Release: REL_14_0 [2ad5f963e] 2021-09-21 19:06:54 -0400
Branch: REL_13_STABLE [5f0a073cb] 2021-09-21 19:06:33 -0400
Branch: REL_12_STABLE [e8b0bcae6] 2021-09-21 19:06:33 -0400
Branch: REL_11_STABLE [13921c511] 2021-09-21 19:06:33 -0400
-->
     <para>
      Fix misevaluation of stable functions called in the arguments of a
      PL/pgSQL <command>CALL</command> statement (Tom Lane)
     </para>

     <para>
      They were being called with an out-of-date snapshot, so that they
      would not see any database changes made since the start of the
      session's top-level command.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1bf2518dd] 2021-09-13 12:42:03 -0400
Branch: REL_14_STABLE Release: REL_14_0 [4ffd3fe4d] 2021-09-13 12:42:28 -0400
Branch: REL_13_STABLE [745abdd95] 2021-09-13 12:42:03 -0400
Branch: REL_12_STABLE [b1de90699] 2021-09-13 12:42:03 -0400
Branch: REL_11_STABLE [bdd6ce48d] 2021-09-13 12:42:03 -0400
Branch: REL_10_STABLE [fe70ec907] 2021-09-13 12:42:04 -0400
Branch: REL9_6_STABLE [a460f7eb3] 2021-09-13 12:42:04 -0400
-->
     <para>
      Allow <literal>EXIT</literal> out of the outermost block in a
      PL/pgSQL routine (Tom Lane)
     </para>

     <para>
      If the routine does not require an explicit <literal>RETURN</literal>,
      this usage should be valid, but it was rejected.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [87ad49147] 2021-09-03 21:04:44 -0400
Branch: REL_14_STABLE Release: REL_14_0 [69d670e68] 2021-09-03 21:04:44 -0400
Branch: REL_13_STABLE [742b30cae] 2021-09-03 21:04:44 -0400
Branch: REL_12_STABLE [3b302eb1e] 2021-09-03 21:04:44 -0400
Branch: REL_11_STABLE [beb404d3b] 2021-09-03 21:04:44 -0400
Branch: REL_10_STABLE [6e2f45817] 2021-09-03 21:04:45 -0400
Branch: REL9_6_STABLE [9a070c658] 2021-09-03 21:04:45 -0400
-->
     <para>
      Remove <application>pg_ctl</application>'s hard-coded limits on the
      total length of generated commands (Phil Krylov)
     </para>

     <para>
      For example, this removes a restriction on how many command-line
      options can be passed through to the postmaster.  Individual path
      names that <application>pg_ctl</application> deals with, such as the
      postmaster executable's name or the data directory name, are still
      limited to <literal>MAXPGPATH</literal> bytes in most cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2acc84c6f] 2021-10-22 15:22:25 -0400
Branch: REL_14_STABLE [3ad2c2455] 2021-10-22 15:22:25 -0400
Branch: REL_13_STABLE [476006023] 2021-10-22 15:22:26 -0400
Branch: REL_12_STABLE [52b927a73] 2021-10-22 15:22:26 -0400
Branch: REL_11_STABLE [871dfe4b7] 2021-10-22 15:22:26 -0400
Branch: REL_10_STABLE [10f9faf6d] 2021-10-22 15:22:26 -0400
Branch: REL9_6_STABLE [b1df061f7] 2021-10-22 15:22:26 -0400
-->
     <para>
      Fix <application>pg_dump</application> to dump non-global default
      privileges correctly (Neil Chen, Masahiko Sawada)
     </para>

     <para>
      If a global (unrestricted) <command>ALTER DEFAULT
      PRIVILEGES</command> command revoked some present-by-default
      privilege, for example <literal>EXECUTE</literal> for functions, and
      then a restricted <command>ALTER DEFAULT PRIVILEGES</command>
      command granted that privilege again for a selected role or
      schema, <application>pg_dump</application> failed to dump the
      restricted privilege grant correctly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e2ff7d9a8] 2021-10-16 12:23:57 -0400
Branch: REL_14_STABLE [b5152e3ba] 2021-10-16 12:24:11 -0400
Branch: REL_13_STABLE [6a262ba8c] 2021-10-16 12:24:17 -0400
Branch: REL_12_STABLE [fd182a92a] 2021-10-16 12:24:24 -0400
Branch: REL_11_STABLE [ca7a4ce58] 2021-10-16 12:24:33 -0400
Branch: REL_10_STABLE [2e2a23283] 2021-10-16 12:24:40 -0400
-->
     <para>
      Make <application>pg_dump</application> acquire shared lock on
      partitioned tables that are to be dumped (Tom Lane)
     </para>

     <para>
      This oversight was usually pretty harmless, since
      once <application>pg_dump</application> has locked any of the leaf
      partitions, that would suffice to prevent significant DDL on the
      partitioned table itself.  However problems could ensue when dumping
      a childless partitioned table, since no relevant lock would be held.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bd3611db5] 2021-08-31 15:04:05 -0400
Branch: REL_14_STABLE Release: REL_14_0 [a20a9f26c] 2021-08-31 15:04:05 -0400
Branch: REL_13_STABLE [db11b4a3d] 2021-08-31 15:04:05 -0400
Branch: REL_12_STABLE [6b9667392] 2021-08-31 15:04:05 -0400
Branch: REL_11_STABLE [a60860ff3] 2021-08-31 15:04:05 -0400
Branch: REL_10_STABLE [ba8f1a0be] 2021-08-31 15:04:05 -0400
Branch: REL9_6_STABLE [dd3105286] 2021-08-31 15:04:05 -0400
Branch: master [6c450a861] 2021-08-31 13:53:49 -0400
Branch: REL_14_STABLE Release: REL_14_0 [9407dbbcb] 2021-08-31 13:53:49 -0400
Branch: REL_13_STABLE [904ce45bf] 2021-08-31 13:53:50 -0400
Branch: REL_12_STABLE [2f1ed9d98] 2021-08-31 13:53:50 -0400
Branch: REL_11_STABLE [c4b298ee1] 2021-08-31 13:53:51 -0400
Branch: REL_10_STABLE [0e7bdc722] 2021-08-31 13:53:51 -0400
Branch: REL9_6_STABLE [4645997c8] 2021-08-31 13:53:33 -0400
-->
     <para>
      Improve <application>pg_dump</application>'s performance by avoiding
      making per-table queries for RLS policies, and by avoiding repetitive
      calls to <function>format_type()</function> (Tom Lane)
     </para>

     <para>
      These changes provide only marginal improvement when dumping from a
      local server, but a dump from a remote server can benefit
      substantially due to fewer network round-trips.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [40dfac4fc] 2021-10-16 15:02:55 -0400
Branch: REL_14_STABLE [3e4c8db93] 2021-10-16 15:03:05 -0400
Branch: REL_13_STABLE [0b5f557b7] 2021-10-16 15:03:10 -0400
Branch: REL_12_STABLE [5b0b2983a] 2021-10-16 15:03:15 -0400
Branch: REL_11_STABLE [58955c84f] 2021-10-16 15:03:21 -0400
-->
     <para>
      Fix crash in <application>pg_dump</application> when attempting to
      dump trigger definitions from a pre-8.3 server (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [998d060f3] 2021-10-19 12:59:54 +0200
Branch: REL_14_STABLE [3e2f32b01] 2021-10-19 12:59:54 +0200
Branch: REL_13_STABLE [687fe8a9d] 2021-10-19 12:59:54 +0200
Branch: REL_12_STABLE [e788883de] 2021-10-19 12:59:54 +0200
Branch: REL_11_STABLE [038892c81] 2021-10-19 12:59:54 +0200
Branch: REL_10_STABLE [4fda03b67] 2021-10-19 12:59:54 +0200
Branch: REL9_6_STABLE [ef1f15819] 2021-10-19 12:59:54 +0200
-->
     <para>
      Fix incorrect filename in <application>pg_restore</application>'s
      error message about an invalid large object TOC file (Daniel
      Gustafsson)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [d33674708] 2021-09-29 21:46:56 +0900
Branch: REL_14_STABLE [8021334d3] 2021-09-29 21:47:25 +0900
Branch: REL_13_STABLE [3cc85d7d5] 2021-09-29 21:47:31 +0900
Branch: master [2acb7cc6b] 2021-09-29 21:48:52 +0900
Branch: REL_14_STABLE [8231c500e] 2021-09-29 21:49:29 +0900
Branch: REL_13_STABLE [8cf4f7118] 2021-09-29 21:49:36 +0900
Branch: REL_12_STABLE [c5f7e702d] 2021-09-29 21:49:40 +0900
-->
     <para>
      Ensure that <application>pgbench</application> exits with non-zero
      status after a socket-level failure (Yugo Nagata, Fabien Coelho)
     </para>

     <para>
      The desired behavior is to finish out the run but then exit with
      status 2.  Also, fix the reporting of such errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a6bd28beb] 2021-08-10 18:10:29 -0400
Branch: REL_14_STABLE Release: REL_14_0 [a4957b5a7] 2021-08-10 18:10:30 -0400
Branch: REL_13_STABLE [7ba487cf9] 2021-08-10 18:10:30 -0400
Branch: REL_12_STABLE [cd7d9b6b6] 2021-08-10 18:10:30 -0400
Branch: REL_11_STABLE [eefa4c2b5] 2021-08-10 18:10:30 -0400
Branch: REL_10_STABLE [843d2879a] 2021-08-10 18:10:30 -0400
Branch: REL9_6_STABLE [5a9df5d50] 2021-08-10 18:10:30 -0400
-->
     <para>
      Fix failure of <filename>contrib/btree_gin</filename> indexes
      on <type>"char"</type>
      (not <type>char(<replaceable>n</replaceable>)</type>) columns,
      when an indexscan using the <literal>&lt;</literal>
      or <literal>&lt;=</literal> operator is performed (Tom Lane)
     </para>

     <para>
      Such an indexscan failed to return all the entries it should.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a667b0668] 2021-10-31 19:13:48 -0400
Branch: REL_14_STABLE [7104e0b24] 2021-10-31 19:13:48 -0400
Branch: REL_13_STABLE [3a5b313ce] 2021-10-31 19:13:48 -0400
Branch: REL_12_STABLE [16d0da5c8] 2021-10-31 19:13:48 -0400
Branch: REL_11_STABLE [5dd067430] 2021-10-31 19:13:48 -0400
Branch: REL_10_STABLE [d87d5f8d8] 2021-10-31 19:13:48 -0400
Branch: REL9_6_STABLE [fdb60ca83] 2021-10-31 19:13:48 -0400
-->
     <para>
      Change <filename>contrib/pg_stat_statements</filename> to read
      its <quote>query texts</quote> file in units of at most 1GB
      (Tom Lane)
     </para>

     <para>
      Such large query text files are very unusual, but if they do occur,
      the previous coding would fail on Windows 64 (which rejects
      individual read requests of more than 2GB).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3071bbfe4] 2021-10-06 15:50:24 -0400
Branch: REL_14_STABLE [12ff678e1] 2021-10-06 15:50:24 -0400
Branch: REL_13_STABLE [aee83f39a] 2021-10-06 15:50:24 -0400
Branch: REL_12_STABLE [228897374] 2021-10-06 15:50:24 -0400
Branch: REL_11_STABLE [88807757d] 2021-10-06 15:50:24 -0400
Branch: REL_10_STABLE [2e33fbda1] 2021-10-06 15:50:24 -0400
Branch: REL9_6_STABLE [36c9f7d96] 2021-10-06 15:50:24 -0400
-->
     <para>
      Fix null-pointer crash
      when <filename>contrib/postgres_fdw</filename> tries to report a
      data conversion error (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c32fcac56] 2021-08-13 13:59:43 -0400
Branch: REL_14_STABLE Release: REL_14_0 [4ffbd55d9] 2021-08-13 13:59:44 -0400
Branch: REL_13_STABLE [48695decc] 2021-08-13 13:59:06 -0400
Branch: REL_12_STABLE [cdda2b247] 2021-08-13 13:59:13 -0400
Branch: REL_11_STABLE [8024ff478] 2021-08-13 13:59:18 -0400
Branch: REL_10_STABLE [7915a9515] 2021-08-13 13:59:25 -0400
Branch: REL9_6_STABLE [582a2affa] 2021-08-13 13:59:33 -0400
-->
     <para>
      Add spinlock support for the RISC-V architecture (Marek Szuba)
     </para>

     <para>
      This is essential for reasonable performance on that platform.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master Release: REL_14_BR [22e1943f1] 2021-03-23 11:48:37 +0100
Branch: REL_13_STABLE [a69e1506f] 2021-09-25 11:25:48 +0200
Branch: REL_12_STABLE [90cfd269f] 2021-09-25 11:25:48 +0200
Branch: REL_11_STABLE [0f28d267c] 2021-09-25 11:25:48 +0200
Branch: REL_10_STABLE [841075a65] 2021-09-25 11:25:48 +0200
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [318df8023] 2021-08-10 15:01:52 +0200
Branch: REL_14_STABLE Release: REL_14_0 [4fa2b15e1] 2021-09-25 11:27:20 +0200
Branch: REL_13_STABLE [135d8687a] 2021-09-25 11:27:20 +0200
Branch: REL_12_STABLE [00c72da4a] 2021-09-25 11:27:20 +0200
Branch: REL_11_STABLE [11901cd96] 2021-09-25 11:27:20 +0200
Branch: REL_10_STABLE [e802b594e] 2021-09-25 11:27:20 +0200
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [72bbff4cd] 2021-08-10 15:08:46 +0200
Branch: REL_14_STABLE Release: REL_14_0 [6d0001aab] 2021-09-25 11:27:28 +0200
Branch: REL_13_STABLE [8e7199453] 2021-09-25 11:27:28 +0200
Branch: REL_12_STABLE [7b6ce36fb] 2021-09-25 11:27:28 +0200
Branch: REL_11_STABLE [19e91a40b] 2021-09-25 11:27:28 +0200
Branch: REL_10_STABLE [eb643536b] 2021-09-25 11:27:28 +0200
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [41f30ecc2] 2021-10-20 16:48:24 +0900
Branch: REL_14_STABLE [81aefaea8] 2021-10-20 16:48:57 +0900
Branch: REL_13_STABLE [abb9ee92c] 2021-10-20 16:49:00 +0900
Branch: REL_12_STABLE [1539e0ecd] 2021-10-20 16:49:03 +0900
Branch: REL_11_STABLE [e00d45fea] 2021-10-20 16:49:06 +0900
Branch: REL_10_STABLE [922e3c3b7] 2021-10-20 16:49:10 +0900
Branch: REL9_6_STABLE [d581960df] 2021-10-20 16:49:14 +0900
-->
     <para>
      Support OpenSSL 3.0.0
      (Peter Eisentraut, Daniel Gustafsson, Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Branch: master [31f860a52] 2021-08-17 14:30:01 +0200
Branch: REL_14_STABLE Release: REL_14_0 [b88377ad6] 2021-08-17 14:30:25 +0200
Branch: REL_13_STABLE [e15f32f0e] 2021-08-17 14:31:00 +0200
Branch: REL_12_STABLE [ed209db77] 2021-08-17 14:31:08 +0200
Branch: REL_11_STABLE [f1d5a94fc] 2021-08-17 14:30:39 +0200
Branch: REL_10_STABLE [ef7e24ff7] 2021-08-17 14:30:51 +0200
Branch: REL9_6_STABLE [0a88d4ece] 2021-08-17 14:31:22 +0200
-->
     <para>
      Set correct type identifier on OpenSSL BIO (I/O abstraction)
      objects created by <productname>PostgreSQL</productname>
      (Itamar Gafni)
     </para>

     <para>
      This oversight probably only matters for code that is doing
      tasks like auditing the OpenSSL installation.  But it's
      nominally a violation of the OpenSSL API, so fix it.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [4c2eab3a0] 2021-09-03 10:52:11 +0200
Branch: master [55392bc5b] 2021-09-06 09:12:34 +0200
Branch: REL_14_STABLE Release: REL_14_0 [1e9afc868] 2021-09-06 09:41:03 +0200
Branch: REL_13_STABLE [9f9ae019d] 2021-09-06 09:43:05 +0200
Branch: REL_12_STABLE [60bf7e69b] 2021-09-06 09:43:18 +0200
-->
     <para>
      Fix our <filename>pkg-config</filename> files to again support static
      linking of <application>libpq</application> (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e757080e0] 2021-09-11 15:19:31 -0400
Branch: REL_14_STABLE Release: REL_14_0 [b33283cbd] 2021-09-11 15:19:43 -0400
Branch: REL_13_STABLE [7e420072e] 2021-09-11 15:19:49 -0400
Branch: REL_12_STABLE [3adde7eb6] 2021-09-11 15:19:54 -0400
Branch: REL_11_STABLE [3be381a90] 2021-09-11 15:19:58 -0400
Branch: REL_10_STABLE [daac97eb0] 2021-09-11 15:20:04 -0400
Branch: REL9_6_STABLE [ec89d7ace] 2021-09-11 15:20:12 -0400
-->
     <para>
      Make <function>pg_regexec()</function> robust against an
      out-of-range <replaceable>search_start</replaceable> parameter
      (Tom Lane)
     </para>

     <para>
      Return <literal>REG_NOMATCH</literal>, instead of possibly crashing,
      when <replaceable>search_start</replaceable> is past the end of the
      string.  This case is probably unreachable within
      core <productname>PostgreSQL</productname>, but extensions might be
      more careless about the parameter value.
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [7821a0bf2] 2021-10-14 12:24:00 -0700
Branch: REL_14_STABLE [0b90f1c4c] 2021-10-14 12:24:22 -0700
Branch: REL_13_STABLE [20f785732] 2021-10-14 12:24:47 -0700
Branch: REL_12_STABLE [ab11f6e46] 2021-10-14 12:25:07 -0700
Branch: REL_11_STABLE [3f5d481ef] 2021-10-14 12:25:30 -0700
Branch: REL_10_STABLE [9364f64a2] 2021-10-14 12:25:48 -0700
Branch: REL9_6_STABLE [ae6abeb88] 2021-10-14 12:26:26 -0700
-->
     <para>
      Ensure that <function>GetSharedSecurityLabel()</function> can be
      used in a newly-started session that has not yet built its critical
      relation cache entries (Jeff Davis)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9b8d68cc6] 2021-10-02 16:05:42 -0400
Branch: REL_14_STABLE [fa8db4879] 2021-10-02 16:06:09 -0400
Branch: REL_13_STABLE [9c76689de] 2021-10-02 16:06:23 -0400
Branch: REL_12_STABLE [e5b25f19b] 2021-10-02 16:06:45 -0400
Branch: REL_11_STABLE [9cc919b51] 2021-10-02 16:06:55 -0400
Branch: REL_10_STABLE [e323630cd] 2021-10-02 16:07:16 -0400
Branch: REL9_6_STABLE [dbec5a2fe] 2021-10-02 16:07:37 -0400
Branch: master [ad740067a] 2021-10-02 16:05:10 -0400
Branch: REL_14_STABLE [81464999b] 2021-10-02 16:06:09 -0400
Branch: REL_13_STABLE [7ba8eb81f] 2021-10-02 16:06:23 -0400
Branch: REL_12_STABLE [4721e8aa6] 2021-10-02 16:06:45 -0400
Branch: REL_11_STABLE [bb6d42669] 2021-10-02 16:06:55 -0400
Branch: REL_10_STABLE [cb0799db0] 2021-10-02 16:07:16 -0400
Branch: REL9_6_STABLE [37cbe0f79] 2021-10-02 16:07:36 -0400
Branch: master [c1aa3b3c0] 2021-10-04 14:52:39 -0400
Branch: REL_14_STABLE [919c08d90] 2021-10-04 14:52:17 -0400
Branch: REL_13_STABLE [c53ff69e1] 2021-10-04 14:52:17 -0400
Branch: REL_12_STABLE [07873a5dc] 2021-10-04 14:52:17 -0400
Branch: REL_11_STABLE [d0b0b70dc] 2021-10-04 14:52:17 -0400
Branch: REL_10_STABLE [cd2479142] 2021-10-04 14:52:17 -0400
Branch: REL9_6_STABLE [b5f34ae08] 2021-10-04 14:52:17 -0400
-->
     <para>
      Use the CLDR project's data to map Windows time zone names to IANA
      time zones (Tom Lane)
     </para>

     <para>
      When running on Windows, <application>initdb</application> attempts
      to set the new cluster's <varname>timezone</varname> parameter to
      the IANA time zone matching the system's prevailing time zone.
      We were using a mapping table that we'd generated years ago and
      updated only fitfully; unsurprisingly, it contained a number of
      errors as well as omissions of recently-added zones.  It turns out
      that CLDR has been tracking the most appropriate mappings, so start
      using their data.  This change will not affect any existing
      installation, only newly-initialized clusters.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [937aafd6d] 2021-10-29 11:38:18 -0400
Branch: REL_14_STABLE [0c8a40b39] 2021-10-29 11:38:32 -0400
Branch: REL_13_STABLE [4cd72add0] 2021-10-29 11:38:38 -0400
Branch: REL_12_STABLE [14b8d25d6] 2021-10-29 11:38:47 -0400
Branch: REL_11_STABLE [91455f7c6] 2021-10-29 11:38:53 -0400
Branch: REL_10_STABLE [d0fe211ce] 2021-10-29 11:38:58 -0400
Branch: REL9_6_STABLE [22a498b9b] 2021-10-29 11:39:05 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2021e for DST law changes in Fiji, Jordan, Palestine, and
      Samoa, plus historical corrections for Barbados, Cook Islands,
      Guyana, Niue, Portugal, and Tonga.
     </para>

     <para>
      Also, the Pacific/Enderbury zone has been renamed to Pacific/Kanton.
      Also, the following zones have been merged into nearby, more-populous
      zones whose clocks have agreed with them since 1970: Africa/Accra,
      America/Atikokan, America/Blanc-Sablon, America/Creston,
      America/Curacao, America/Nassau, America/Port_of_Spain,
      Antarctica/DumontDUrville, and Antarctica/Syowa.
      In all these cases, the previous zone name remains as an alias.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-8">
  <title>Release 12.8</title>

  <formalpara>
  <title>Release date:</title>
  <para>2021-08-12</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.7.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.8</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.6,
    see <xref linkend="release-12-6"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [6ee41a301] 2021-05-31 12:03:00 -0400
Branch: REL_13_STABLE [fe6f63286] 2021-05-31 12:03:00 -0400
Branch: REL_12_STABLE [6f9e7f21f] 2021-05-31 12:03:00 -0400
Branch: REL_11_STABLE [fe194f731] 2021-05-31 12:03:00 -0400
-->
     <para>
      Fix mis-planning of repeated application of a projection step
      (Tom Lane)
     </para>

     <para>
      The planner could create an incorrect plan in cases where two
      ProjectionPaths were stacked on top of each other.  The only known
      way to trigger that situation involves parallel sort operations, but
      there may be other instances.  The result would be crashes or
      incorrect query results.
      Disclosure of server memory contents is also possible.
      (CVE-2021-3677)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_14_BR [01e6f1a84] 2021-05-25 10:10:09 +0900
Branch: REL_13_STABLE [a23c0b00f] 2021-05-25 10:11:13 +0900
Branch: REL_12_STABLE [3f8072be8] 2021-05-25 10:11:17 +0900
Branch: REL_11_STABLE [96918b76f] 2021-05-25 10:11:21 +0900
Branch: REL_10_STABLE [c64b5d10d] 2021-05-25 10:11:26 +0900
Branch: REL9_6_STABLE [7777df34d] 2021-05-25 10:11:33 +0900
-->
     <para>
      Disallow SSL renegotiation more completely (Michael Paquier)
     </para>

     <para>
      SSL renegotiation has been disabled for some time, but the server
      would still cooperate with a client-initiated renegotiation request.
      A maliciously crafted renegotiation request could result in a server
      crash (see OpenSSL issue CVE-2021-3449).  Disable the feature
      altogether on OpenSSL versions that permit doing so, which are
      1.1.0h and newer.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [84f5c2908] 2021-05-21 14:03:59 -0400
Branch: REL_13_STABLE [d18ee6f92] 2021-05-21 14:03:53 -0400
Branch: REL_12_STABLE [41c6a5bec] 2021-05-21 14:03:53 -0400
Branch: REL_11_STABLE [ef9480509] 2021-05-21 14:03:53 -0400
Branch: master Release: REL_14_BR [3a09d75b4] 2021-06-10 12:27:27 -0400
Branch: REL_13_STABLE [6e43f1c2d] 2021-06-10 12:27:27 -0400
Branch: REL_12_STABLE [26383da7d] 2021-06-10 12:27:27 -0400
Branch: REL_11_STABLE [eea081ad0] 2021-06-10 12:27:27 -0400
Branch: master Release: REL_14_BR [d102aafb6] 2021-06-22 17:48:39 -0400
Branch: REL_13_STABLE [6f1321d5a] 2021-06-22 17:48:39 -0400
Branch: REL_12_STABLE [29d5d5761] 2021-06-22 17:48:39 -0400
Branch: REL_11_STABLE [77200c569] 2021-06-22 17:48:39 -0400
Branch: master [ef12f32c0] 2021-07-31 11:50:14 -0400
Branch: REL_14_STABLE [ec410c985] 2021-07-31 11:50:14 -0400
Branch: REL_13_STABLE [93f99693f] 2021-07-31 11:50:14 -0400
Branch: REL_12_STABLE [f26043645] 2021-07-31 11:50:14 -0400
Branch: REL_11_STABLE [cefb1230e] 2021-07-31 11:50:14 -0400
Branch: master Release: REL_14_BR [f21fadafa] 2021-05-20 18:32:37 -0400
Branch: REL_13_STABLE [c64183f23] 2021-05-20 18:32:37 -0400
Branch: REL_12_STABLE [8d341d6cb] 2021-05-20 18:32:37 -0400
Branch: REL_11_STABLE [0c1b2cb17] 2021-05-20 18:32:37 -0400
-->
     <para>
      Restore the Portal-level snapshot after <command>COMMIT</command>
      or <command>ROLLBACK</command> within a procedure (Tom Lane)
     </para>

     <para>
      This change fixes cases where an attempt to fetch a toasted value
      immediately after <command>COMMIT</command>/<command>ROLLBACK</command>
      would fail with errors like <quote>no known snapshots</quote> or
      <quote>missing chunk number 0 for toast value</quote>.
     </para>

     <para>
      Some extensions may attempt to execute SQL code outside of any
      Portal.  They are responsible for ensuring that an outer snapshot
      exists before doing so.  Previously, not providing a snapshot might
      work or it might not; now it will consistently fail
      with <quote>cannot execute SQL without an outer snapshot or
      portal</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [ba2c6d6ce] 2021-06-08 17:50:29 -0400
Branch: REL_13_STABLE [c1fd756fd] 2021-06-08 17:50:15 -0400
Branch: REL_12_STABLE [c3b508268] 2021-06-08 17:50:15 -0400
Branch: REL_11_STABLE [2757865fa] 2021-06-08 17:50:15 -0400
Branch: master Release: REL_14_BR [be9009890] 2021-06-08 18:40:06 -0400
Branch: REL_13_STABLE [c5b281841] 2021-06-08 18:40:06 -0400
Branch: REL_12_STABLE [182323300] 2021-06-08 18:40:06 -0400
Branch: REL_11_STABLE [5b7bf9f72] 2021-06-08 18:40:06 -0400
-->
     <para>
      Avoid misbehavior when persisting the output of a cursor that's
      reading a non-stable query (Tom Lane)
     </para>

     <para>
      Previously, we'd always rewind and re-read the whole query result,
      possibly getting results different from the earlier execution,
      causing great confusion later.  For a NO SCROLL cursor, we can fix
      this by only storing the not-yet-read portion of the query output,
      which is sufficient since a NO SCROLL cursor can't be backed up.
      Cursors with the SCROLL option remain at hazard, but that was
      already documented to be an unsafe option to use with a non-stable
      query.  Make those documentation warnings stronger.
     </para>

     <para>
      Also force NO SCROLL mode for the implicit cursor used by
      a <application>PL/pgSQL</application> FOR-over-query loop,
      to avoid this type of problem when persisting such a cursor
      during an intra-procedure commit.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [1103033ae] 2021-06-01 11:12:56 -0400
Branch: REL_13_STABLE [e5b0fffa1] 2021-06-01 11:12:56 -0400
Branch: REL_12_STABLE [762fe98b1] 2021-06-01 11:12:56 -0400
Branch: REL_11_STABLE [dc272157a] 2021-06-01 11:12:56 -0400
Branch: REL_10_STABLE [39862dde4] 2021-06-01 11:12:56 -0400
Branch: REL9_6_STABLE [3eca18522] 2021-06-01 11:12:56 -0400
-->
     <para>
      Reject <literal>SELECT ... GROUP BY GROUPING SETS (()) FOR
      UPDATE</literal> (Tom Lane)
     </para>

     <para>
      This should be disallowed, just as <literal>FOR UPDATE</literal>
      with a plain <literal>GROUP BY</literal> is disallowed, but the test
      for that failed to handle empty grouping sets correctly.
      The end result would be a null-pointer dereference in the executor.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a9da1934e] 2021-07-09 11:02:26 -0400
Branch: REL_14_STABLE [39b6e85f1] 2021-07-09 11:02:26 -0400
Branch: REL_13_STABLE [6edccac16] 2021-07-09 11:02:26 -0400
Branch: REL_12_STABLE [9c729bd30] 2021-07-09 11:02:26 -0400
Branch: REL_11_STABLE [158594f99] 2021-07-09 11:02:26 -0400
Branch: REL_10_STABLE [51df19a05] 2021-07-09 11:02:26 -0400
Branch: REL9_6_STABLE [f0271cb15] 2021-07-09 11:02:26 -0400
-->
     <para>
      Reject cases where a query in <literal>WITH</literal>
      rewrites to just <command>NOTIFY</command> (Tom Lane)
     </para>

     <para>
      Such cases previously crashed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [e7fc488ad] 2021-07-10 12:42:59 +0100
Branch: REL_14_STABLE [06883d58f] 2021-07-10 12:45:00 +0100
Branch: REL_13_STABLE [f23a9b8a4] 2021-07-10 12:46:13 +0100
Branch: REL_12_STABLE [357b66ef9] 2021-07-10 12:47:45 +0100
Branch: REL_11_STABLE [5763ef42c] 2021-07-10 12:48:59 +0100
Branch: REL_10_STABLE [54a0ec1bd] 2021-07-10 12:50:05 +0100
Branch: REL9_6_STABLE [f8abf6944] 2021-07-10 12:51:22 +0100
-->
     <para>
      In <type>numeric</type> multiplication, round the result rather than
      failing if it would have more than 16383 digits after the decimal
      point (Dean Rasheed)
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [4dd5ce2fd] 2021-07-31 11:21:44 +0100
Branch: REL_14_STABLE [0d6b87497] 2021-07-31 11:23:48 +0100
Branch: REL_13_STABLE [053ec4e0c] 2021-07-31 11:25:39 +0100
Branch: REL_12_STABLE [5c62920fa] 2021-07-31 11:27:02 +0100
Branch: REL_11_STABLE [dcd0ab672] 2021-07-31 11:28:10 +0100
Branch: REL_10_STABLE [39b0bda67] 2021-07-31 11:29:50 +0100
Branch: REL9_6_STABLE [5cf350ce0] 2021-07-31 11:31:18 +0100
Branch: REL_11_STABLE [434ddfb79] 2021-08-05 22:24:28 +0100
Branch: master [2642df9fa] 2021-08-06 21:29:15 +0100
Branch: REL_14_STABLE [032556570] 2021-08-06 21:30:25 +0100
Branch: REL_13_STABLE [da188b993] 2021-08-06 21:31:20 +0100
Branch: REL_12_STABLE [cc4420f88] 2021-08-06 21:31:58 +0100
Branch: REL_11_STABLE [7a9c9acfe] 2021-08-06 21:32:46 +0100
Branch: REL_10_STABLE [f20b6bc96] 2021-08-06 21:33:25 +0100
Branch: REL9_6_STABLE [5b7b92ad7] 2021-08-06 21:34:04 +0100
-->
     <para>
      Fix corner-case errors and loss of precision when
      raising <type>numeric</type> values to very large powers
      (Dean Rasheed)
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [226ec49ff] 2021-08-05 09:24:11 +0100
Branch: REL_14_STABLE [ecbdbdfd9] 2021-08-05 09:27:35 +0100
Branch: REL_13_STABLE [a72ad6315] 2021-08-05 09:29:13 +0100
Branch: REL_12_STABLE [43644bd3b] 2021-08-05 09:30:37 +0100
Branch: REL_11_STABLE [4851940a5] 2021-08-05 09:32:03 +0100
Branch: REL_10_STABLE [661558bc3] 2021-08-05 09:33:55 +0100
Branch: REL9_6_STABLE [ed3e1663c] 2021-08-05 09:35:46 +0100
-->
     <para>
      Fix division-by-zero failure in <function>to_char()</function>
      with <literal>EEEE</literal> format and a <type>numeric</type> input
      value less than 10^(-1001) (Dean Rasheed)
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [55fe60938] 2021-07-09 14:04:30 +1200
Branch: REL_14_STABLE [6de3a21bb] 2021-07-09 14:04:40 +1200
Branch: REL_13_STABLE [6f88b68ff] 2021-07-09 14:04:49 +1200
Branch: REL_12_STABLE [efc42a1e1] 2021-07-09 14:04:56 +1200
Branch: REL_11_STABLE [45bad6a39] 2021-07-09 14:05:05 +1200
Branch: REL_10_STABLE [1efcd5720] 2021-07-09 14:05:15 +1200
Branch: REL9_6_STABLE [674ee3b76] 2021-07-09 14:05:24 +1200
Branch: REL_13_STABLE [87103002c] 2021-07-09 15:12:31 +1200
Branch: REL_12_STABLE [b18621139] 2021-07-09 15:13:01 +1200
Branch: REL_11_STABLE [137af4f27] 2021-07-09 15:13:29 +1200
Branch: REL_10_STABLE [dd76aa54a] 2021-07-09 15:14:01 +1200
Branch: REL9_6_STABLE [3e474a708] 2021-07-09 15:14:26 +1200
-->
     <para>
      Fix <function>pg_size_pretty(bigint)</function> to round negative
      values consistently with the way it rounds positive ones (and
      consistently with the <type>numeric</type> version) (Dean Rasheed,
      David Rowley)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [1250aad42] 2021-06-12 13:29:24 -0400
Branch: REL_13_STABLE [f479ea94b] 2021-06-12 13:29:24 -0400
Branch: REL_12_STABLE [7681b78fb] 2021-06-12 13:29:24 -0400
Branch: REL_11_STABLE [25d1ef1aa] 2021-06-12 13:29:24 -0400
Branch: REL_10_STABLE [26a053533] 2021-06-12 13:29:24 -0400
Branch: REL9_6_STABLE [c1ffbbcbc] 2021-06-12 13:29:24 -0400
-->
     <para>
      Make <literal>pg_filenode_relation(0, 0)</literal> return NULL
      rather than failing (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [626731db2] 2021-07-11 12:54:24 -0400
Branch: REL_14_STABLE [69dfc36fd] 2021-07-11 12:54:24 -0400
Branch: REL_13_STABLE [1c612bc98] 2021-07-11 12:54:24 -0400
Branch: REL_12_STABLE [92340ba5a] 2021-07-11 12:54:24 -0400
Branch: REL_11_STABLE [6bd9ae173] 2021-07-11 12:54:24 -0400
Branch: REL_10_STABLE [1d49c8887] 2021-07-11 12:54:24 -0400
Branch: REL9_6_STABLE [734be249d] 2021-07-11 12:54:24 -0400
-->
     <para>
      Make <command>ALTER EXTENSION</command> lock the extension when
      adding or removing a member object (Tom Lane)
     </para>

     <para>
      The previous coding allowed <command>ALTER EXTENSION
      ADD/DROP</command> to occur concurrently with <command>DROP
      EXTENSION</command>, leading to a crash or corrupt catalog entries.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [29abde637] 2021-07-19 10:36:15 +0530
Branch: REL_14_STABLE [40295d158] 2021-07-19 10:54:21 +0530
Branch: REL_13_STABLE [bfa2a926d] 2021-07-19 11:04:21 +0530
Branch: REL_12_STABLE [f2f459f18] 2021-07-19 11:15:03 +0530
Branch: REL_11_STABLE [eb158e74a] 2021-07-19 11:23:35 +0530
Branch: REL_10_STABLE [22fd784af] 2021-07-19 11:32:08 +0530
-->
     <para>
      Fix <command>ALTER SUBSCRIPTION</command> to reject an empty slot
      name (Japin Li)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [df80fa2ee] 2021-07-16 13:01:43 -0400
Branch: REL_14_STABLE [eef92de11] 2021-07-16 13:01:43 -0400
Branch: REL_13_STABLE [c31516ae5] 2021-07-16 13:01:43 -0400
Branch: REL_12_STABLE [7584ec1f6] 2021-07-16 13:01:43 -0400
Branch: REL_11_STABLE [fed35bd4a] 2021-07-16 13:01:43 -0400
-->
     <para>
      When cloning a partitioned table's triggers to a new partition,
      ensure that their enabled status is copied
      (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9179a82d7] 2021-08-07 13:29:32 -0400
Branch: REL_14_STABLE [2c915905e] 2021-08-07 13:29:32 -0400
Branch: REL_13_STABLE [ba9f665a4] 2021-08-07 13:29:32 -0400
Branch: REL_12_STABLE [1ff1e4a60] 2021-08-07 13:29:32 -0400
Branch: REL_11_STABLE [d33fc4110] 2021-08-07 13:29:32 -0400
Branch: REL_10_STABLE [ac818984a] 2021-08-07 13:29:32 -0400
Branch: REL9_6_STABLE [c08b3a9eb] 2021-08-07 13:29:32 -0400
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_14_BR [187682c32] 2021-06-03 15:28:24 +0900
Branch: REL_13_STABLE [75d66d10e] 2021-06-03 15:28:37 +0900
Branch: REL_12_STABLE [4ceaa760b] 2021-06-03 15:28:41 +0900
Branch: REL_11_STABLE [dbc9dbba5] 2021-06-03 15:28:45 +0900
Branch: REL_10_STABLE [20f70f558] 2021-06-03 15:28:53 +0900
Branch: REL9_6_STABLE [d9525c46c] 2021-06-03 15:29:01 +0900
-->
     <para>
      Avoid alias conflicts in queries generated
      for <command>REFRESH MATERIALIZED VIEW CONCURRENTLY</command>
      (Tom Lane, Bharath Rupireddy)
     </para>

     <para>
      This command failed on materialized views containing columns with
      certain names, notably <structfield>mv</structfield>
      and <structfield>newdata</structfield>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6310809c4] 2021-07-24 18:35:52 -0400
Branch: REL_14_STABLE [712ba6b8b] 2021-07-24 18:35:52 -0400
Branch: REL_13_STABLE [f47408cdc] 2021-07-24 18:35:52 -0400
Branch: REL_12_STABLE [899785b4f] 2021-07-24 18:35:52 -0400
Branch: REL_11_STABLE [7b2262a21] 2021-07-24 18:35:52 -0400
Branch: REL_10_STABLE [654372169] 2021-07-24 18:35:52 -0400
Branch: REL9_6_STABLE [1861390e6] 2021-07-24 18:35:52 -0400
-->
     <para>
      Fix <command>PREPARE TRANSACTION</command> to check correctly
      for conflicting session-lifespan and transaction-lifespan locks
      (Tom Lane)
     </para>

     <para>
      A transaction cannot be prepared if it has both session-lifespan and
      transaction-lifespan locks on the same advisory-lock ID value.  This
      restriction was not fully checked, which could lead to a PANIC
      during <command>PREPARE TRANSACTION</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [d21fca084] 2021-06-18 18:00:09 -0400
Branch: REL_13_STABLE [33af10c59] 2021-06-18 18:00:09 -0400
Branch: REL_12_STABLE [c58a41605] 2021-06-18 18:00:09 -0400
Branch: REL_11_STABLE [ea5ae3ae1] 2021-06-18 18:00:09 -0400
Branch: REL_10_STABLE [b7e3a4407] 2021-06-18 18:00:09 -0400
Branch: REL9_6_STABLE [0b29b41e5] 2021-06-18 18:00:09 -0400
-->
     <para>
      Fix misbehavior of <command>DROP OWNED BY</command> when the target
      role is listed more than once in an RLS policy (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [5a0f1c8c0] 2021-06-25 13:59:38 -0400
Branch: REL_13_STABLE [ba815f00a] 2021-06-25 13:59:38 -0400
Branch: REL_12_STABLE [f851696a2] 2021-06-25 13:59:38 -0400
Branch: REL_11_STABLE [fea89d64e] 2021-06-25 13:59:38 -0400
Branch: REL_10_STABLE [f5b780c45] 2021-06-25 13:59:38 -0400
Branch: REL9_6_STABLE [9c7a150ae] 2021-06-25 13:59:38 -0400
-->
     <para>
      Skip unnecessary error tests when removing a role from an RLS policy
      during <command>DROP OWNED BY</command> (Tom Lane)
     </para>

     <para>
      Notably, this fixes some cases where it was necessary to be a
      superuser to use <command>DROP OWNED BY</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [4b1007445] 2021-05-21 15:12:08 -0400
Branch: REL_13_STABLE [849c7971d] 2021-05-21 15:12:19 -0400
Branch: REL_12_STABLE [61feb8670] 2021-05-21 15:12:37 -0400
-->
     <para>
      Disallow whole-row variables in <literal>GENERATED</literal>
      expressions (Tom Lane)
     </para>

     <para>
      Use of a whole-row variable clearly violates the rule that a
      generated column cannot depend on itself, so such cases have no
      well-defined behavior.  The actual behavior frequently included a
      crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [2b0ee126b] 2021-05-21 15:02:06 -0400
Branch: REL_13_STABLE [77e3204ec] 2021-05-21 15:02:07 -0400
Branch: REL_12_STABLE [dfe51ffbe] 2021-05-21 15:02:07 -0400
-->
     <para>
      Fix usage of <structfield>tableoid</structfield>
      in <literal>GENERATED</literal> expressions (Tom Lane)
     </para>

     <para>
      Some code paths failed to provide a valid value for this system
      column while evaluating a <literal>GENERATED</literal> expression.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master Release: REL_14_BR [0a4efdc7e] 2021-06-18 06:51:12 -0400
Branch: REL_13_STABLE [5b6b5e5ee] 2021-06-18 07:44:58 -0400
Branch: REL_12_STABLE [6432bfe8a] 2021-06-18 07:46:21 -0400
Branch: REL_11_STABLE [306c31804] 2021-06-18 07:53:08 -0400
Branch: REL_11_STABLE [0d3b69ae0] 2021-06-18 11:45:45 -0400
-->
     <para>
      Don't store a <quote>fast default</quote> when adding a column to a
      foreign table (Andrew Dunstan)
     </para>

     <para>
      The fast default is useless since no local heap storage exists for
      such a table, but it confused subsequent operations.  In addition to
      suppressing creation of such catalog entries in <command>ALTER
      TABLE</command> commands, adjust the downstream code to cope
      when one is incorrectly present.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_14_BR [83158f74d] 2020-09-14 13:56:41 +0900
Branch: REL_13_STABLE [acb60edf0] 2021-06-28 10:39:09 +0900
Branch: REL_12_STABLE [e52f7cbec] 2021-06-28 10:43:01 +0900
Branch: REL_11_STABLE [08acba558] 2021-06-28 10:43:04 +0900
Branch: REL_10_STABLE [3c465883b] 2021-06-28 10:43:08 +0900
Branch: REL9_6_STABLE [d3d0cbeb6] 2021-06-28 10:43:13 +0900
Branch: master Release: REL_14_BR [09a69f6e2] 2021-06-28 11:17:05 +0900
Branch: REL_13_STABLE [fd7bc10ab] 2021-06-28 11:17:12 +0900
Branch: REL_12_STABLE [ce8949c4b] 2021-06-28 11:17:16 +0900
Branch: REL_11_STABLE [38ca11ade] 2021-06-28 11:17:20 +0900
Branch: REL_10_STABLE [5160d5bb1] 2021-06-28 11:17:25 +0900
Branch: REL9_6_STABLE [21257a8f6] 2021-06-28 11:17:30 +0900
-->
     <para>
      Allow index state flags to be updated transactionally
      (Michael Paquier, Andrey Lepikhov)
     </para>

     <para>
      This avoids failures when dealing with index predicates that aren't
      really immutable.  While that's not considered a supported case, the
      original reason for using a non-transactional update here is long
      gone, so we may as well change it.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_13_STABLE [102f31a20] 2021-06-18 12:09:22 -0400
Branch: REL_12_STABLE [b2c740c42] 2021-06-18 12:09:22 -0400
Branch: REL_11_STABLE [4b8b3562e] 2021-06-18 12:09:22 -0400
Branch: REL_10_STABLE [f172438ef] 2021-06-18 12:09:22 -0400
Branch: REL9_6_STABLE [1a3d30255] 2021-06-18 12:09:22 -0400
-->
     <para>
      Avoid corrupting the plan cache entry when <command>CREATE
      DOMAIN</command> or <command>ALTER DOMAIN</command> appears
      in a cached plan (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [f560209c6] 2020-09-14 12:35:00 -0400
Branch: REL_13_STABLE [4a20de9d9] 2021-06-25 10:46:10 -0400
Branch: REL_12_STABLE [04a476057] 2021-06-25 10:46:10 -0400
Branch: REL_11_STABLE [c39983600] 2021-06-25 10:46:10 -0400
Branch: REL_10_STABLE [4040139f2] 2021-06-25 10:46:10 -0400
-->
     <para>
      Make walsenders show their latest replication commands
      in <structname>pg_stat_activity</structname> (Tom Lane)
     </para>

     <para>
      Previously, a walsender would show its latest SQL command, which was
      confusing if it's now doing some replication operation instead.
      Now we show replication-protocol commands on the same footing as SQL
      commands.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [93a0bf239] 2021-07-27 15:44:12 -0400
Branch: REL_14_STABLE [ad3b40eb2] 2021-07-27 15:44:12 -0400
Branch: REL_13_STABLE [b8f91d7f9] 2021-07-27 15:44:12 -0400
Branch: REL_12_STABLE [6feb229f5] 2021-07-27 15:44:12 -0400
Branch: REL_11_STABLE [ddd1eac99] 2021-07-27 15:44:12 -0400
Branch: REL_10_STABLE [04fa0e11a] 2021-07-27 15:44:12 -0400
Branch: REL9_6_STABLE [85ec6c322] 2021-07-27 15:44:12 -0400
-->
     <para>
      Make
      <structname>pg_settings</structname>.<structfield>pending_restart</structfield>
      show as true when the pertinent entry
      in <filename>postgresql.conf</filename> has been removed
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      <structfield>pending_restart</structfield> correctly showed the case
      where an entry that cannot be changed without a postmaster restart
      has been modified, but not where the entry had been removed
      altogether.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [889592344] 2021-06-02 14:38:14 -0400
Branch: REL_13_STABLE [6753a5b7e] 2021-06-02 14:38:14 -0400
Branch: REL_12_STABLE [bdd096f1a] 2021-06-02 14:38:14 -0400
-->
     <para>
      Fix mis-planning of queries involving regular tables that are
      inheritance children of foreign tables (Amit Langote)
     </para>

     <para>
      <command>SELECT FOR UPDATE</command> and related commands would fail
      with assertion failures or <quote>could not find junk column</quote>
      errors in such cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master Release: REL_14_BR [caba8f0d4] 2021-06-09 16:17:00 -0400
Branch: REL_13_STABLE [082656429] 2021-06-09 16:17:13 -0400
Branch: REL_12_STABLE [5d950c721] 2021-06-09 16:19:52 -0400
Branch: REL_11_STABLE [ca158c168] 2021-06-09 16:20:10 -0400
Branch: REL_10_STABLE [31bda6a22] 2021-06-09 16:20:28 -0400
Branch: REL9_6_STABLE [6eb5b9ae3] 2021-06-09 16:21:14 -0400
Branch: master Release: REL_14_BR [4dcb1d087] 2021-06-10 09:46:08 -0400
Branch: REL_13_STABLE [3465328aa] 2021-06-10 09:47:25 -0400
Branch: REL_12_STABLE [2208d71a0] 2021-06-10 09:34:39 -0400
Branch: REL_11_STABLE [534b9be80] 2021-06-10 09:43:35 -0400
Branch: REL_10_STABLE [1c2c6a9a2] 2021-06-10 09:48:07 -0400
Branch: REL9_6_STABLE [6cd0e55f9] 2021-06-10 09:51:00 -0400
Branch: REL9_6_STABLE [75212a854] 2021-06-09 16:16:21 -0400
Branch: REL_13_STABLE [99a0a2ada] 2021-06-09 12:28:39 -0400
Branch: REL_12_STABLE [6fc2febc2] 2021-06-09 12:29:00 -0400
Branch: REL_11_STABLE [38982b8b7] 2021-06-09 12:30:28 -0400
Branch: REL_10_STABLE [9778a191a] 2021-06-09 12:30:49 -0400
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master Release: REL_14_BR [c3652f976] 2021-06-12 08:43:54 -0400
Branch: REL_13_STABLE [45322bd9b] 2021-06-12 08:51:29 -0400
Branch: REL_12_STABLE [1730a3334] 2021-06-12 08:54:28 -0400
Branch: REL_11_STABLE [8b9e1275c] 2021-06-12 08:55:29 -0400
Branch: REL_10_STABLE [0cd8a55bd] 2021-06-12 08:55:39 -0400
Branch: REL9_6_STABLE [dee7ad20d] 2021-06-12 08:55:55 -0400
Branch: master Release: REL_14_BR [9d97c3408] 2021-06-13 07:19:34 -0400
Branch: REL_13_STABLE [47d5781cb] 2021-06-13 07:19:34 -0400
Branch: REL_12_STABLE [914c716ca] 2021-06-13 07:19:35 -0400
Branch: REL_11_STABLE [8cb3d95c2] 2021-06-13 07:19:36 -0400
Branch: REL_10_STABLE [319d616dd] 2021-06-13 07:19:38 -0400
Branch: REL9_6_STABLE [84cb4be71] 2021-06-13 07:19:40 -0400
Branch: master Release: REL_14_BR [54a5ed220] 2021-06-15 15:35:47 -0400
Branch: REL_13_STABLE [d906d106f] 2021-06-15 15:36:50 -0400
Branch: REL_12_STABLE [fb3d6b0e1] 2021-06-15 15:36:59 -0400
Branch: REL_11_STABLE [c0a758780] 2021-06-15 15:37:07 -0400
Branch: REL_10_STABLE [1dc53c914] 2021-06-15 15:37:15 -0400
Branch: REL9_6_STABLE [e46f6a078] 2021-06-15 15:37:24 -0400
-->
     <para>
      Fix corner-case failure of a new standby to follow a new primary
      (Dilip Kumar, Robert Haas)
     </para>

     <para>
      Under a narrow combination of conditions, the standby could wind up
      trying to follow the wrong WAL timeline.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [a00c138b7] 2021-07-29 01:31:41 +0900
Branch: REL_14_STABLE [f2a3d7404] 2021-07-29 01:33:33 +0900
Branch: REL_13_STABLE [a66b05b42] 2021-07-29 01:34:13 +0900
Branch: REL_12_STABLE [d7ded08e6] 2021-07-29 01:35:00 +0900
Branch: REL_11_STABLE [02ef4d1e2] 2021-07-29 01:35:05 +0900
Branch: REL_10_STABLE [25fe5b2bb] 2021-07-29 01:35:10 +0900
Branch: REL9_6_STABLE [32d182dd0] 2021-07-29 01:35:52 +0900
-->
     <para>
      Update minimum recovery point when WAL replay of a transaction abort
      record causes file truncation (Fujii Masao)
     </para>

     <para>
      File truncation is irreversible, so it's no longer safe to stop
      recovery at a point earlier than that record.  The corresponding
      case for transaction commit was fixed years ago, but this one was
      overlooked.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [50371df26] 2021-07-02 16:04:54 -0400
Branch: REL_14_STABLE [63a952167] 2021-07-02 16:05:20 -0400
Branch: REL_13_STABLE [7fc97752d] 2021-07-02 16:04:54 -0400
Branch: REL_12_STABLE [feff61557] 2021-07-02 16:04:54 -0400
Branch: REL_11_STABLE [32d50b895] 2021-07-02 16:04:54 -0400
Branch: REL_10_STABLE [0b5089e8c] 2021-07-02 16:04:54 -0400
-->
     <para>
      In walreceivers, avoid attempting catalog lookups after an error
      (Masahiko Sawada, Bharath Rupireddy)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master Release: REL_14_BR [2945a488a] 2020-11-16 18:27:51 +0900
Branch: REL_13_STABLE [8d091922f] 2021-07-25 11:15:30 +0900
Branch: REL_12_STABLE [1bcfda30f] 2021-07-25 11:16:02 +0900
Branch: REL_11_STABLE [9c83398f8] 2021-07-25 11:16:13 +0900
Branch: REL_10_STABLE [710fabfa2] 2021-07-25 11:16:26 +0900
Branch: REL9_6_STABLE [8e5be9cfe] 2021-07-25 11:16:34 +0900
-->
     <para>
      Ensure that a standby server's startup process will respond to a
      shutdown signal promptly while waiting for WAL to arrive (Fujii
      Masao, Soumyadeep Chakraborty)
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master Release: REL_14_BR [b786304c2] 2021-06-28 09:29:38 +0530
Branch: REL_13_STABLE [741deb260] 2021-06-28 08:42:48 +0530
Branch: REL_12_STABLE [b75c1f687] 2021-06-28 09:17:10 +0530
Branch: REL_11_STABLE [c62c3769f] 2021-06-28 09:09:42 +0530
-->
     <para>
      Correctly clear shared state after failing to become a member of a
      transaction commit group (Amit Kapila)
     </para>

     <para>
      Given the right timing, this could cause an assertion failure when
      some later session re-uses the same PGPROC object.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master Release: REL_14_BR [b6d8d2073] 2021-06-24 10:45:23 +0300
Branch: REL_13_STABLE [2a0ab13f8] 2021-06-24 10:45:34 +0300
Branch: REL_12_STABLE [caac19650] 2021-06-24 10:45:43 +0300
Branch: REL_11_STABLE [c78bb32c1] 2021-06-24 10:45:46 +0300
Branch: REL_10_STABLE [a5eacd86b] 2021-06-24 10:45:49 +0300
Branch: REL9_6_STABLE [85ae8ccb2] 2021-06-24 10:45:52 +0300
Branch: master Release: REL_14_BR [9b8ed0f52] 2021-06-24 11:19:03 +0300
Branch: REL_13_STABLE [6fb377e5f] 2021-06-24 11:19:31 +0300
Branch: REL_12_STABLE [8b01a403c] 2021-06-24 11:19:34 +0300
Branch: REL_11_STABLE [eb3bd243a] 2021-06-24 11:19:37 +0300
Branch: REL_10_STABLE [fbbc48995] 2021-06-24 11:19:40 +0300
Branch: REL9_6_STABLE [5956795cb] 2021-06-24 11:19:44 +0300
-->
     <para>
      Add locking to avoid reading incorrect relmapper data in the face of
      a concurrent write from another process (Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master Release: REL_14_BR [5cc1cd502] 2021-06-11 19:07:32 -0400
Branch: REL_13_STABLE [065ce069a] 2021-06-11 19:07:32 -0400
Branch: REL_12_STABLE [0c7efd975] 2021-06-11 19:07:32 -0400
-->
     <para>
      Improve progress reporting for the sort phase of a parallel btree
      index build (Matthias van de Meent)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [fe6a20ce5] 2021-06-12 12:59:15 -0400
Branch: REL_13_STABLE [8b5055812] 2021-06-12 12:59:15 -0400
Branch: REL_12_STABLE [1f280e833] 2021-06-12 12:59:15 -0400
Branch: REL_11_STABLE [9eecea7f3] 2021-06-12 12:59:15 -0400
Branch: REL_10_STABLE [4745c119e] 2021-06-12 12:59:15 -0400
-->
     <para>
      Improve checks for violations of replication protocol (Tom Lane)
     </para>

     <para>
      Logical replication workers frequently used Asserts to check for
      cases that could be triggered by invalid or out-of-order replication
      commands.  This seems unwise, so promote these tests to regular
      error checks.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master Release: REL_14_BR [6d0eb3855] 2021-05-21 07:54:27 +0530
Branch: REL_13_STABLE [c83c0257e] 2021-05-21 08:03:38 +0530
Branch: REL_12_STABLE [18c6242b7] 2021-05-21 08:17:25 +0530
Branch: REL_11_STABLE [71787b23e] 2021-05-21 08:31:10 +0530
-->
     <para>
      Fix deadlock when multiple logical replication workers try to
      truncate the same table (Peter Smith, Haiying Tang)
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master Release: REL_14_BR [4daa140a2] 2021-06-15 08:28:36 +0530
Branch: REL_13_STABLE [602a32a68] 2021-06-15 08:41:16 +0530
Branch: REL_12_STABLE [40ad7ebff] 2021-06-15 08:50:12 +0530
Branch: REL_11_STABLE [1f8a934e0] 2021-06-15 09:02:32 +0530
Branch: REL_10_STABLE [35f56c124] 2021-06-15 09:10:24 +0530
Branch: REL9_6_STABLE [43acadfce] 2021-06-15 09:18:38 +0530
Branch: REL_13_STABLE [56e366f67] 2021-06-24 15:21:50 +0530
Branch: REL_12_STABLE [72b51e214] 2021-06-24 15:25:13 +0530
Branch: REL_11_STABLE [e95f617ac] 2021-06-24 15:26:37 +0530
-->
     <para>
      Fix error cases and memory leaks in logical decoding of speculative
      insertions (Dilip Kumar)
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [dd0e37cc1] 2021-07-10 10:26:38 -0700
Branch: REL_14_STABLE [10a07973c] 2021-07-10 10:27:07 -0700
Branch: REL_13_STABLE [edd9a2bf7] 2021-07-10 10:27:27 -0700
Branch: REL_12_STABLE [5b1621d2f] 2021-07-10 10:28:15 -0700
Branch: REL_11_STABLE [52c168db9] 2021-07-10 10:28:33 -0700
-->
     <para>
      Avoid leaving an invalid record-type hash table entry behind after
      an error (Sait Talha Nisanci)
     </para>

     <para>
      This could lead to later crashes or memory leakage.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [131ea3e90] 2021-06-16 19:30:17 -0400
Branch: REL_13_STABLE [d03a41d1c] 2021-06-16 19:30:17 -0400
Branch: REL_12_STABLE [17d962cca] 2021-06-16 19:30:17 -0400
Branch: REL_11_STABLE [9cf163266] 2021-06-16 19:30:17 -0400
Branch: REL_10_STABLE [a6f7745a3] 2021-06-16 19:30:17 -0400
Branch: REL9_6_STABLE [c50596cdc] 2021-06-16 19:30:17 -0400
-->
     <para>
      Fix plan cache reference leaks in some error cases in
      <command>CREATE TABLE ... AS EXECUTE</command> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master Release: REL_14_BR [b1d653890] 2021-05-29 15:12:34 +1200
Branch: REL_13_STABLE [d41fda6aa] 2021-05-29 15:13:44 +1200
Branch: REL_12_STABLE [82248f227] 2021-05-29 15:14:53 +1200
Branch: REL_11_STABLE [a15d84470] 2021-05-29 15:16:15 +1200
-->
     <para>
      Fix race condition in code for sharing tuple descriptors across
      parallel workers (Thomas Munro)
     </para>

     <para>
      Given the right timing, a crash could result.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [30d8bad49] 2021-05-15 12:21:06 -0400
Branch: REL_13_STABLE [c3cc73e14] 2021-05-15 12:21:06 -0400
Branch: REL_12_STABLE [6bcb51968] 2021-05-15 12:21:06 -0400
Branch: REL_11_STABLE [6fcbaea7a] 2021-05-15 12:21:06 -0400
Branch: REL_10_STABLE [c76ceacbd] 2021-05-15 12:21:06 -0400
Branch: REL9_6_STABLE [5d195dc40] 2021-05-15 12:21:06 -0400
-->
     <para>
      Fix possible race condition when releasing BackgroundWorkerSlots
      (Tom Lane)
     </para>

     <para>
      It's likely that this doesn't fix any observable bug on Intel
      hardware, but machines with weaker memory ordering rules could
      have problems.
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [41469253e] 2021-07-13 12:40:16 +1200
Branch: REL_14_STABLE [a3b8d91cc] 2021-07-13 12:42:04 +1200
Branch: REL_13_STABLE [204f646a2] 2021-07-13 12:42:43 +1200
Branch: REL_12_STABLE [6f1c7a2d0] 2021-07-13 12:44:36 +1200
Branch: REL_11_STABLE [187e9c399] 2021-07-13 12:45:35 +1200
Branch: REL_10_STABLE [b55e478a4] 2021-07-13 12:46:12 +1200
Branch: REL9_6_STABLE [87b7a652b] 2021-07-13 12:46:52 +1200
Branch: master [5bd38d2f2] 2021-07-13 13:27:05 +1200
Branch: REL_14_STABLE [a92709fed] 2021-07-13 13:27:44 +1200
Branch: REL_13_STABLE [2fde8e49a] 2021-07-13 13:28:19 +1200
Branch: REL_12_STABLE [645c5d119] 2021-07-13 13:30:26 +1200
Branch: REL_11_STABLE [eff751ea5] 2021-07-13 13:31:00 +1200
Branch: REL_10_STABLE [d7f10f39c] 2021-07-13 13:31:29 +1200
Branch: REL9_6_STABLE [d0e44bae4] 2021-07-13 13:32:10 +1200
-->
     <para>
      Fix latent crash in sorting code (Ronan Dunklau)
     </para>

     <para>
      One code path could attempt to free a null pointer.  The case
      appears unreachable in the core server's use of sorting, but perhaps
      it could be triggered by extensions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [c3c35a733] 2021-05-14 15:07:34 -0400
Branch: REL_13_STABLE [dc714c120] 2021-05-14 15:07:34 -0400
Branch: REL_12_STABLE [4e046281f] 2021-05-14 15:07:34 -0400
Branch: REL_11_STABLE [d776045eb] 2021-05-14 15:07:34 -0400
Branch: REL_10_STABLE [e87a0d2e0] 2021-05-14 15:07:34 -0400
Branch: REL9_6_STABLE [5015d3c35] 2021-05-14 15:07:34 -0400
-->
     <para>
      Prevent infinite loops in SP-GiST index insertion (Tom Lane)
     </para>

     <para>
      In the event that INCLUDE columns take up enough space to prevent a
      leaf index tuple from ever fitting on a page, the text_ops operator
      class would get into an infinite loop vainly trying to make the
      tuple fit.
      While pre-v11 versions don't have INCLUDE columns, back-patch this
      anti-looping fix to them anyway, as it seems like a good defense
      against bugs in operator classes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [eb7a6b922] 2021-05-14 13:29:39 -0400
Branch: REL_13_STABLE [c1b72bf04] 2021-05-14 13:26:55 -0400
Branch: REL_12_STABLE [004288d3c] 2021-05-14 13:26:55 -0400
Branch: REL_11_STABLE [f4ee4082f] 2021-05-14 13:26:55 -0400
Branch: REL_10_STABLE [fe64adc93] 2021-05-14 13:26:55 -0400
Branch: REL9_6_STABLE [4c6cfcc37] 2021-05-14 13:26:55 -0400
Branch: master Release: REL_14_BR [e47f93f98] 2021-05-14 13:29:39 -0400
Branch: REL_13_STABLE [63831c162] 2021-05-14 12:54:26 -0400
Branch: REL_12_STABLE [4c646b179] 2021-05-14 12:54:26 -0400
Branch: REL_11_STABLE [8274f4517] 2021-05-14 12:54:26 -0400
Branch: REL_10_STABLE [39b8ccb08] 2021-05-14 12:54:26 -0400
Branch: REL9_6_STABLE [567328989] 2021-05-14 12:54:26 -0400
-->
     <para>
      Ensure that SP-GiST index insertion can be terminated by a query
      cancel request (Tom Lane, &Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d9809bf86] 2021-07-20 13:01:48 -0400
Branch: REL_14_STABLE [899564e01] 2021-07-20 13:01:48 -0400
Branch: REL_13_STABLE [0fce76b99] 2021-07-20 13:01:48 -0400
Branch: REL_12_STABLE [85189f54a] 2021-07-20 13:01:48 -0400
Branch: REL_11_STABLE [7321d5c3f] 2021-07-20 13:01:48 -0400
Branch: REL_10_STABLE [4eac891b1] 2021-07-20 13:01:48 -0400
Branch: REL9_6_STABLE [dffec69fe] 2021-07-20 13:01:48 -0400
-->
     <para>
      Fix uninitialized-variable bug that could
      cause <application>PL/pgSQL</application> to act as though
      an <literal>INTO</literal> clause
      specified <literal>STRICT</literal>, even though it didn't
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6f5d9bce5] 2021-06-28 14:17:41 -0400
Branch: REL_14_STABLE [cf1f545bf] 2021-06-28 14:17:42 -0400
Branch: REL_13_STABLE [1603deca3] 2021-06-28 14:17:42 -0400
Branch: REL_12_STABLE [240d56fc4] 2021-06-28 14:17:42 -0400
Branch: REL_11_STABLE [34c24e5a4] 2021-06-28 14:17:42 -0400
Branch: REL_10_STABLE [06a2b2fe5] 2021-06-28 14:17:42 -0400
Branch: REL9_6_STABLE [b54be47cd] 2021-06-28 14:17:42 -0400
-->
     <para>
      Don't abort the process for an out-of-memory failure in libpq's
      printing functions (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: John Naylor <john.naylor@postgresql.org>
Branch: master [5fcf3945b] 2021-07-30 15:39:22 -0400
Branch: REL_14_STABLE [f051b87ac] 2021-07-30 16:28:43 -0400
Branch: REL_13_STABLE [171bf1cea] 2021-07-30 16:18:59 -0400
Branch: REL_12_STABLE [d9589eb62] 2021-07-30 15:59:10 -0400
Branch: REL_11_STABLE [c7181a32c] 2021-07-30 16:12:17 -0400
Branch: REL_10_STABLE [231c19a89] 2021-07-30 16:40:42 -0400
Branch: REL9_6_STABLE [cfcb0ceab] 2021-07-30 16:34:33 -0400
Branch: REL_11_STABLE [9455e7f50] 2021-07-30 18:54:38 -0400
Branch: REL_10_STABLE [f3cd6aeb8] 2021-07-30 18:54:10 -0400
Branch: REL9_6_STABLE [fa27389c5] 2021-07-30 18:52:55 -0400
-->
     <para>
      In <application>ecpg</application>, allow the <type>numeric</type>
      value <systemitem>INT_MIN</systemitem> (usually -2147483648) to be
      converted to integer (John Naylor)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [42f94f56b] 2021-06-07 14:15:25 -0400
Branch: REL_13_STABLE [5b6436874] 2021-06-07 14:15:25 -0400
Branch: REL_12_STABLE [fc896f45d] 2021-06-07 14:15:25 -0400
Branch: REL_11_STABLE [89a5499ef] 2021-06-07 14:15:25 -0400
Branch: REL_10_STABLE [4826fe4c5] 2021-06-07 14:15:25 -0400
Branch: REL9_6_STABLE [ac600c541] 2021-06-07 14:15:25 -0400
Branch: REL_10_STABLE [0b116346b] 2021-06-07 13:12:35 -0400
Branch: REL9_6_STABLE [7cdb97632] 2021-06-07 13:12:35 -0400
-->
     <para>
      In <application>psql</application> and other client programs, avoid
      overrunning the ends of strings when dealing with invalidly-encoded
      data (Tom Lane)
     </para>

     <para>
      An incorrectly-encoded multibyte character near the end of a string
      could cause various processing loops to run past the string's
      terminating NUL, with results ranging from no detectable issue to
      a program crash, depending on what happens to be in the following
      memory.  This is reminiscent of CVE-2006-2313, although these
      particular cases do not appear to have interesting security
      consequences.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [f0e21f2f6] 2021-07-16 17:29:22 -0400
Branch: REL_14_STABLE [3c5b7c628] 2021-07-16 17:29:22 -0400
Branch: REL_13_STABLE [cc340af33] 2021-07-16 17:29:22 -0400
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Branch: REL_11_STABLE [ccfc3cbb3] 2021-07-16 17:29:22 -0400
-->
     <para>
      Fix <application>pg_dump</application> to correctly handle triggers
      on partitioned tables whose enabled status is different from their
      parent triggers' status
      (Justin Pryzby, &Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [f807e3410] 2021-06-13 14:32:42 -0400
Branch: REL_13_STABLE [bc7885b7f] 2021-06-13 14:32:42 -0400
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Branch: REL9_6_STABLE [dd53b46c7] 2021-06-13 14:32:42 -0400
-->
     <para>
      Avoid <quote>invalid creation date in header</quote> warnings
      observed when running <application>pg_restore</application> on an
      archive file created in a different time zone (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [74cf7d46a] 2021-07-26 22:38:15 -0400
Branch: REL_14_STABLE [695b4a113] 2021-07-26 22:38:14 -0400
Branch: REL_13_STABLE [0a5e708e2] 2021-07-26 22:38:14 -0400
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Branch: REL9_6_STABLE [088dbf3bc] 2021-07-26 22:38:14 -0400
-->
     <para>
      Make <application>pg_upgrade</application> carry forward the old
      installation's <literal>oldestXID</literal> value (Bertrand Drouvot)
     </para>

     <para>
      Previously, the new installation's <literal>oldestXID</literal> was
      set to a value old enough to (usually) force immediate
      anti-wraparound autovacuuming.  That's not desirable from a
      performance standpoint; what's worse, installations using large
      values of <varname>autovacuum_freeze_max_age</varname> could suffer
      unwanted forced shutdowns soon after an upgrade.
     </para>
    </listitem>

    <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [e462856a7] 2021-08-03 11:58:15 -0400
Branch: REL_14_STABLE [4051a7775] 2021-08-03 11:58:15 -0400
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Branch: REL9_6_STABLE [5e531bb1d] 2021-08-03 11:58:14 -0400
Branch: master [9e51cc87f] 2021-08-03 12:26:08 -0400
Branch: REL_14_STABLE [3a0ba31a3] 2021-08-03 12:26:08 -0400
Branch: REL_13_STABLE [47a573d91] 2021-08-03 12:26:08 -0400
Branch: REL_12_STABLE [165506217] 2021-08-03 12:26:08 -0400
Branch: REL_11_STABLE [554a7648e] 2021-08-03 12:26:08 -0400
Branch: REL_10_STABLE [fcdc461f5] 2021-08-03 12:26:08 -0400
Branch: REL9_6_STABLE [3ab496ab8] 2021-08-03 12:26:08 -0400
-->
     <para>
      Extend <application>pg_upgrade</application> to detect and warn
      about extensions that should be upgraded (Bruce Momjian)
     </para>

     <para>
      A script file is now produced containing the <command>ALTER
      EXTENSION UPDATE</command> commands needed to bring extensions up to
      the versions that are considered default in the new installation.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [7fbe0c8c4] 2021-07-20 12:12:39 +0900
Branch: REL_14_STABLE [3a0d2d0cb] 2021-07-20 12:12:47 +0900
Branch: REL_13_STABLE [fb2b86015] 2021-07-20 12:12:51 +0900
Branch: REL_12_STABLE [b9a0de15e] 2021-07-20 12:12:54 +0900
Branch: REL_11_STABLE [795a9166e] 2021-07-20 12:12:57 +0900
Branch: REL_10_STABLE [11dbad74c] 2021-07-20 12:13:01 +0900
Branch: master [4ef64c425] 2021-07-26 11:13:37 +0900
Branch: REL_14_STABLE [b0d286719] 2021-07-26 11:14:08 +0900
Branch: REL_13_STABLE [2c7395aad] 2021-07-26 11:14:11 +0900
Branch: REL_12_STABLE [c4ef3b81b] 2021-07-26 11:14:14 +0900
Branch: REL_11_STABLE [9c6fa3403] 2021-07-26 11:14:17 +0900
Branch: REL_10_STABLE [4372f0685] 2021-07-26 11:14:21 +0900
-->
     <para>
      Avoid problems when
      switching <application>pg_receivewal</application> between
      compressed and non-compressed WAL storage (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
Branch: master [aa769f80e] 2021-08-05 20:00:00 +0900
Branch: REL_14_STABLE [588d3f597] 2021-08-05 20:00:01 +0900
Branch: REL_13_STABLE [388a81bf4] 2021-08-05 20:00:02 +0900
Branch: REL_12_STABLE [bbc0cd8fa] 2021-08-05 20:00:04 +0900
-->
     <para>
      Fix <filename>contrib/postgres_fdw</filename> to work usefully with
      generated columns (Etsuro Fujita)
     </para>

     <para>
      <filename>postgres_fdw</filename> will now behave reasonably with
      generated columns, so long as a generated column in a foreign table
      represents a generated column in the remote table.  <command>IMPORT
      FOREIGN SCHEMA</command> will now import generated columns that way
      by default.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c7b7311f6] 2021-07-06 12:36:12 -0400
Branch: REL_14_STABLE [86d491421] 2021-07-06 12:36:12 -0400
Branch: REL_13_STABLE [bee18616a] 2021-07-06 12:36:13 -0400
Branch: REL_12_STABLE [bd2e68d0b] 2021-07-06 12:36:13 -0400
Branch: REL_11_STABLE [a9460dbf1] 2021-07-06 12:36:13 -0400
Branch: REL_10_STABLE [b23ac5aef] 2021-07-06 12:36:13 -0400
Branch: REL9_6_STABLE [67f925bbd] 2021-07-06 12:36:13 -0400
-->
     <para>
      In <filename>contrib/postgres_fdw</filename>, avoid attempting
      catalog lookups after an error (Tom Lane)
     </para>

     <para>
      While this usually worked, it's not very safe since the error might
      have been one that made catalog access nonfunctional.  A side effect
      of the fix is that messages about data conversion errors will now
      mention the query's table and column aliases (if used) rather than
      the true underlying name of a foreign table or column.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [741d7f104] 2021-06-22 21:43:12 -0400
Branch: REL_13_STABLE [e2cde85ef] 2021-06-22 21:43:12 -0400
Branch: REL_12_STABLE [f228c401b] 2021-06-22 21:43:12 -0400
Branch: REL_11_STABLE [a1417e437] 2021-06-22 21:43:12 -0400
Branch: REL_10_STABLE [1f32b789d] 2021-06-22 21:43:12 -0400
Branch: REL9_6_STABLE [13f3fd9e4] 2021-06-22 21:43:12 -0400
Branch: master Release: REL_14_BR [4a054069a] 2021-06-23 11:13:00 -0400
Branch: REL_13_STABLE [b961bdfe1] 2021-06-23 11:12:31 -0400
Branch: REL_12_STABLE [d7da3ef08] 2021-06-23 11:12:31 -0400
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Branch: REL_10_STABLE [0a8929ca0] 2021-06-23 11:12:31 -0400
Branch: REL9_6_STABLE [e535a8899] 2021-06-23 11:12:32 -0400
Branch: master Release: REL_14_BR [a443c1b2d] 2021-06-23 18:41:39 -0400
Branch: REL_13_STABLE [5179a1ab7] 2021-06-23 18:41:39 -0400
Branch: REL_12_STABLE [35e6b3bbf] 2021-06-23 18:41:39 -0400
Branch: REL_11_STABLE [94d8d8d89] 2021-06-23 18:41:39 -0400
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Branch: REL9_6_STABLE [ad9827a90] 2021-06-23 18:41:39 -0400
Branch: REL_12_STABLE [7a48dfbb8] 2021-06-24 11:30:32 -0400
Branch: REL_11_STABLE [c6cb62f61] 2021-06-24 11:30:32 -0400
Branch: REL_10_STABLE [024e064af] 2021-06-24 11:30:32 -0400
Branch: REL9_6_STABLE [e0a7036e1] 2021-06-24 11:30:32 -0400
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [989d23b04] 2019-08-24 11:45:05 +0900
Branch: master Release: REL_13_BR [06fdc4e4d] 2019-08-24 12:34:37 +0900
Branch: REL_12_STABLE [96f3661e4] 2021-06-17 11:57:21 +0900
Branch: REL_11_STABLE [8f3229942] 2021-06-17 11:57:26 +0900
Branch: REL_10_STABLE [feac82fa8] 2021-06-17 11:57:35 +0900
Branch: REL9_6_STABLE [484c81bf7] 2021-06-17 11:57:44 +0900
Branch: master Release: REL_13_BR [9903338b5] 2019-08-24 11:35:43 +0900
Branch: REL_12_STABLE [a8f687927] 2021-06-17 11:01:16 +0900
Branch: REL_11_STABLE [834cb7269] 2021-06-17 11:01:20 +0900
Branch: REL_10_STABLE [0ed218048] 2021-06-17 11:01:25 +0900
Branch: REL9_6_STABLE [b7cd5c5b0] 2021-06-17 11:01:32 +0900
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [642c0697c] 2021-06-27 12:45:04 -0400
Branch: REL_13_STABLE [2d0944865] 2021-06-27 12:45:04 -0400
Branch: REL_12_STABLE [bc031cf13] 2021-06-27 12:45:04 -0400
Branch: REL_11_STABLE [1acab1209] 2021-06-27 12:45:04 -0400
Branch: REL_10_STABLE [7676d9594] 2021-06-27 12:45:04 -0400
Branch: REL9_6_STABLE [de589c112] 2021-06-27 12:45:04 -0400
-->
     <para>
      Improve the isolation-test infrastructure (Tom Lane, Michael Paquier)
     </para>

     <para>
      Allow isolation test steps to be annotated to show the expected
      completion order.  This allows getting stable results from
      otherwise-racy test cases, without the long delays that we
      previously used (not entirely successfully) to fend off race
      conditions.
      Allow non-quoted identifiers as isolation test session/step names
      (formerly, all such names had to be double-quoted).
      Detect and warn about unused steps in isolation tests.
      Improve display of query results in isolation tests.
      Remove isolationtester's <quote>dry-run</quote> mode.
      Remove memory leaks in isolationtester itself.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9753324b7] 2021-07-05 16:51:57 -0400
Branch: REL_14_STABLE [07f1e0696] 2021-07-05 16:51:57 -0400
Branch: REL_13_STABLE [2f487116e] 2021-07-05 16:51:57 -0400
Branch: REL_12_STABLE [3edc2dbc0] 2021-07-05 16:51:57 -0400
Branch: REL_11_STABLE [76c23bbb4] 2021-07-05 16:51:57 -0400
Branch: REL_10_STABLE [8c3e36fcc] 2021-07-05 16:51:57 -0400
Branch: REL9_6_STABLE [b82eabec3] 2021-07-05 16:51:57 -0400
Branch: master Release: REL_14_BR [e135743ef] 2021-05-11 20:59:58 -0400
Branch: REL_13_STABLE [834d9284b] 2021-05-11 20:59:45 -0400
-->
     <para>
      Reduce overhead of cache-clobber testing (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master Release: REL_14_BR [4a682d85a] 2021-06-05 07:16:34 +0200
Branch: REL_13_STABLE [3989f8fb9] 2021-06-17 09:01:22 +0200
Branch: REL_12_STABLE [9438962ce] 2021-06-17 09:02:20 +0200
Branch: REL_11_STABLE [1a2752be8] 2021-06-17 09:02:44 +0200
Branch: REL_10_STABLE [6b6fbfd7e] 2021-06-17 09:03:30 +0200
Branch: REL9_6_STABLE [9c31e4165] 2021-06-17 09:04:15 +0200
Branch: REL_12_STABLE [70293e946] 2021-06-17 16:39:13 +0200
Branch: REL_11_STABLE [ba529a6ff] 2021-06-18 06:51:56 +0200
Branch: REL_10_STABLE [91709e10a] 2021-06-18 06:52:46 +0200
Branch: REL9_6_STABLE [ec52b886d] 2021-06-18 06:52:48 +0200
-->
     <para>
      Fix <application>PL/Python</application>'s regression tests to pass
      with Python 3.10 (Honza Horak)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3779ac62d] 2021-07-24 13:41:17 -0400
Branch: REL_14_STABLE [89ad14cd7] 2021-07-24 13:41:17 -0400
Branch: REL_13_STABLE [c0a6f83de] 2021-07-24 13:41:17 -0400
Branch: REL_12_STABLE [4c8a14e8d] 2021-07-24 13:41:17 -0400
Branch: REL_11_STABLE [9329b9235] 2021-07-24 13:41:17 -0400
Branch: REL_10_STABLE [5a435289d] 2021-07-24 13:41:17 -0400
Branch: REL9_6_STABLE [7e09b504d] 2021-07-24 13:41:17 -0400
-->
     <para>
      Make <literal>printf("%s", NULL)</literal>
      print <literal>(null)</literal> instead of crashing (Tom Lane)
     </para>

     <para>
      This should improve server robustness in corner cases, and it syncs
      our <function>printf</function> implementation with common libraries.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [17707c059] 2021-06-30 11:48:53 +0900
Branch: REL_14_STABLE [607a3a43b] 2021-06-30 11:49:10 +0900
Branch: REL_13_STABLE [41edb2db1] 2021-06-30 11:49:16 +0900
Branch: REL_12_STABLE [b5ee867a7] 2021-06-30 11:49:20 +0900
Branch: REL_11_STABLE [93d3d0cf3] 2021-06-30 11:49:24 +0900
Branch: REL_10_STABLE [d8569db76] 2021-06-30 11:49:29 +0900
Branch: REL9_6_STABLE [68bad2333] 2021-06-30 11:49:36 +0900
-->
     <para>
      Fix incorrect log message when point-in-time recovery stops at
      a <command>ROLLBACK PREPARED</command> record (Simon Riggs)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: REL_14_STABLE [0c83eb2e0] 2021-07-14 17:15:01 +0900
Branch: REL_13_STABLE [522624345] 2021-07-14 17:15:18 +0900
Branch: REL_12_STABLE [b242e1d23] 2021-07-14 17:15:26 +0900
Branch: REL_11_STABLE [85a8c3a4b] 2021-07-14 17:15:31 +0900
-->
     <para>
      Improve <command>ALTER TABLE</command>'s messages for
      wrong-relation-kind errors (Kyotaro Horiguchi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [0e1275fb0] 2021-07-28 01:20:16 +0900
Branch: REL_14_STABLE [fd90f6ba7] 2021-07-28 01:21:35 +0900
Branch: REL_13_STABLE [92913fc29] 2021-07-28 01:21:52 +0900
Branch: REL_12_STABLE [de87c481f] 2021-07-28 01:24:24 +0900
Branch: REL_11_STABLE [42e6b5ccb] 2021-07-28 01:24:51 +0900
Branch: REL_10_STABLE [a84f95ffd] 2021-07-28 01:25:53 +0900
Branch: REL9_6_STABLE [78c21d79d] 2021-07-28 01:26:15 +0900
-->
     <para>
      Clarify error messages referring to <quote>non-negative</quote>
      values (Bharath Rupireddy)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d0a02bdb8] 2021-07-09 12:38:55 -0400
Branch: REL_14_STABLE [5620ec833] 2021-07-09 12:38:55 -0400
Branch: REL_13_STABLE [55cccdfdf] 2021-07-09 12:38:55 -0400
Branch: REL_12_STABLE [a5377e7f7] 2021-07-09 12:38:55 -0400
Branch: REL_11_STABLE [b69e8ad6c] 2021-07-09 12:38:55 -0400
Branch: REL_10_STABLE [7e0b53ad6] 2021-07-09 12:38:55 -0400
Branch: REL9_6_STABLE [cd5d3aefa] 2021-07-09 12:38:55 -0400
Branch: master [31e8cfac5] 2021-07-09 14:15:41 -0400
Branch: REL_14_STABLE [7f2eca6f9] 2021-07-09 14:15:41 -0400
Branch: REL_13_STABLE [cbcf5ffb1] 2021-07-09 14:15:41 -0400
Branch: REL_12_STABLE [83a8bf24e] 2021-07-09 14:15:41 -0400
Branch: REL_11_STABLE [29a4fbd46] 2021-07-09 14:15:41 -0400
Branch: REL_10_STABLE [911488b42] 2021-07-09 14:15:41 -0400
Branch: REL9_6_STABLE [8c9c20899] 2021-07-09 14:15:41 -0400
Branch: master [53c38a086] 2021-07-09 16:59:07 -0400
Branch: REL_14_STABLE [9ffad7ae7] 2021-07-09 16:59:07 -0400
Branch: REL_13_STABLE [32d0bdbfc] 2021-07-09 16:59:07 -0400
Branch: REL_12_STABLE [e82cde74d] 2021-07-09 16:59:08 -0400
Branch: REL_11_STABLE [2c28c689f] 2021-07-09 16:59:08 -0400
Branch: REL_10_STABLE [56533fce7] 2021-07-09 16:59:08 -0400
Branch: REL9_6_STABLE [3c612d9f6] 2021-07-09 16:59:08 -0400
Branch: master [9f6be2e79] 2021-07-10 13:19:30 -0400
Branch: REL_14_STABLE [ebc346e5b] 2021-07-10 13:19:31 -0400
Branch: REL_13_STABLE [9fca23c1d] 2021-07-10 13:19:31 -0400
Branch: REL_12_STABLE [03fc042eb] 2021-07-10 13:19:31 -0400
Branch: REL_11_STABLE [946f62f2f] 2021-07-10 13:19:31 -0400
-->
     <para>
      Fix <application>configure</application> to work with OpenLDAP 2.5,
      which no longer has a separate <filename>libldap_r</filename>
      library (Adrian Ho, Tom Lane)
     </para>

     <para>
      If there is no <filename>libldap_r</filename> library, we now
      silently assume that <filename>libldap</filename> is thread-safe.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [b8c4261e5] 2021-07-01 15:12:21 -0400
Branch: REL_14_STABLE [100e9ae53] 2021-07-01 15:15:09 -0400
Branch: REL_13_STABLE [bd0be7f7a] 2021-07-01 14:31:10 -0400
Branch: REL_12_STABLE [c71471c96] 2021-07-01 14:51:54 -0400
Branch: REL_11_STABLE [a7e3a390e] 2021-07-01 14:52:40 -0400
Branch: REL_10_STABLE [b796435be] 2021-07-01 15:07:20 -0400
Branch: REL9_6_STABLE [cbd5d7c85] 2021-07-01 15:11:53 -0400
Branch: master [7355c241e] 2021-07-01 15:47:46 -0400
Branch: REL_14_STABLE [1da2ea0cc] 2021-07-01 15:47:47 -0400
Branch: REL_13_STABLE [8d2be1402] 2021-07-01 15:40:42 -0400
Branch: REL_12_STABLE [383c29d1e] 2021-07-01 15:43:31 -0400
Branch: REL_11_STABLE [418041748] 2021-07-01 15:43:53 -0400
Branch: REL_10_STABLE [177531ee0] 2021-07-01 15:44:06 -0400
Branch: REL9_6_STABLE [1f7ea06d7] 2021-07-01 15:44:22 -0400
-->
     <para>
      Add new make targets <literal>world-bin</literal>
      and <literal>install-world-bin</literal> (Andrew Dunstan)
     </para>

     <para>
      These are the same as <literal>world</literal>
      and <literal>install-world</literal> respectively, except that they
      do not build or install the documentation.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [a0fc81326] 2021-07-01 09:02:46 -0400
Branch: REL_14_STABLE [c4774ce33] 2021-07-01 08:46:21 -0400
Branch: REL_13_STABLE [a8b564b0c] 2021-07-01 08:46:38 -0400
Branch: REL_12_STABLE [a40f8ea0f] 2021-07-01 08:47:04 -0400
Branch: REL_11_STABLE [58ac8300b] 2021-07-01 08:47:21 -0400
Branch: REL_10_STABLE [16ed3ddbb] 2021-07-01 08:48:24 -0400
Branch: REL9_6_STABLE [d173a4699] 2021-07-01 09:01:36 -0400
-->
     <para>
      Fix make rule for TAP tests (<literal>prove_installcheck</literal>)
      to work in PGXS usage (Andrew Dunstan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master Release: REL_14_BR [9b4e4cfe6] 2021-06-25 11:28:20 +1200
Branch: REL_13_STABLE [d9c05a9ec] 2021-06-25 11:29:00 +1200
Branch: REL_12_STABLE [47d22649e] 2021-06-25 11:29:20 +1200
Branch: REL_11_STABLE [6ada4fd06] 2021-06-25 11:29:47 +1200
-->
     <para>
      Adjust JIT code to prepare for forthcoming LLVM API change
      (Thomas Munro, Andres Freund)
     </para>

     <para>
      LLVM 13 has made an incompatible API change that will cause crashing
      of our previous JIT compiler.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_14_BR [126cdaf47] 2021-06-23 14:01:32 -0400
Branch: REL_13_STABLE [13f365568] 2021-06-23 14:01:32 -0400
Branch: REL_12_STABLE [7eaf65451] 2021-06-23 14:01:32 -0400
Branch: REL_11_STABLE [361acef7e] 2021-06-23 14:01:32 -0400
Branch: REL_10_STABLE [d3a845d1f] 2021-06-23 14:01:32 -0400
Branch: REL9_6_STABLE [006a829b2] 2021-06-23 14:01:33 -0400
-->
     <para>
      Avoid assuming that strings returned by GSSAPI libraries are
      null-terminated (Tom Lane)
     </para>

     <para>
      The GSSAPI spec provides for a string pointer and length.  It seems
      that in practice the next byte after the string is usually zero,
      so that our previous coding didn't actually fail; but we do have
      a report of AddressSanitizer complaints.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_14_BR [025110663] 2021-05-27 20:11:00 +0900
Branch: REL_13_STABLE [ab81d004e] 2021-05-27 20:11:21 +0900
Branch: REL_12_STABLE [a75268f1c] 2021-05-27 20:11:24 +0900
Branch: REL_11_STABLE [cf2e09544] 2021-05-27 20:11:29 +0900
Branch: REL_10_STABLE [8f507dbc6] 2021-05-27 20:11:33 +0900
Branch: REL9_6_STABLE [7a4f2e158] 2021-05-27 20:11:38 +0900
Branch: master Release: REL_14_BR [7ca37fb04] 2020-12-30 12:56:06 -0500
Branch: REL_13_STABLE [e2f21ff60] 2021-06-01 09:27:25 +0900
Branch: REL_12_STABLE [02037af3f] 2021-06-01 09:27:31 +0900
Branch: REL_13_STABLE [949e32ee5] 2021-06-08 13:40:03 +0900
Branch: REL_12_STABLE [b7684bd10] 2021-06-08 13:40:10 +0900
-->
     <para>
      Enable building with GSSAPI on MSVC (Michael Paquier)
     </para>

     <para>
      Fix various incompatibilities with modern Kerberos builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master Release: REL_14_BR [fb424ae85] 2021-05-28 09:30:16 -0400
Branch: REL_13_STABLE [c828a7246] 2021-05-28 09:31:50 -0400
Branch: REL_12_STABLE [ae3ef8569] 2021-05-28 09:32:09 -0400
Branch: REL_11_STABLE [3f70d7e44] 2021-05-28 09:32:24 -0400
Branch: REL_10_STABLE [a8c1062a1] 2021-05-28 09:32:31 -0400
Branch: REL9_6_STABLE [abbd70022] 2021-05-28 09:32:46 -0400
Branch: master Release: REL_14_BR [d69fcb9ca] 2021-05-28 09:35:11 -0400
Branch: REL_13_STABLE [bb18bc224] 2021-05-28 09:36:42 -0400
Branch: REL_12_STABLE [40a05cf24] 2021-05-28 09:35:42 -0400
Branch: REL_11_STABLE [a44a2b9ac] 2021-05-28 09:35:49 -0400
Branch: REL_10_STABLE [d5d89629c] 2021-05-28 09:35:55 -0400
Branch: REL9_6_STABLE [34a65fc63] 2021-05-28 09:36:10 -0400
-->
     <para>
      In MSVC builds, include <option>--with-pgport</option> in the set of
      configure options reported by <application>pg_config</application>,
      if it had been specified (Andrew Dunstan)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-7">
  <title>Release 12.7</title>

  <formalpara>
  <title>Release date:</title>
  <para>2021-05-13</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.6.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.7</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.6,
    see <xref linkend="release-12-6"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f02b9085a] 2021-05-10 10:44:38 -0400
Branch: REL_13_STABLE [467395bfd] 2021-05-10 10:44:38 -0400
Branch: REL_12_STABLE [3b0f6a7ae] 2021-05-10 10:44:38 -0400
Branch: REL_11_STABLE [06bfbe854] 2021-05-10 10:44:38 -0400
Branch: REL_10_STABLE [2fb809d3e] 2021-05-10 10:44:38 -0400
Branch: REL9_6_STABLE [0c1caa48d] 2021-05-10 10:44:38 -0400
-->
     <para>
      Prevent integer overflows in array subscripting calculations
      (Tom Lane)
     </para>

     <para>
      The array code previously did not complain about cases where an
      array's lower bound plus length overflows an integer.  This resulted
      in later entries in the array becoming inaccessible (since their
      subscripts could not be written as integers), but more importantly
      it confused subsequent assignment operations.  This could lead to
      memory overwrites, with ensuing crashes or unwanted data
      modifications.
      (CVE-2021-32027)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [049e1e2ed] 2021-05-10 11:02:29 -0400
Branch: REL_13_STABLE [4a8656a7e] 2021-05-10 11:02:29 -0400
Branch: REL_12_STABLE [a5fa3e067] 2021-05-10 11:02:29 -0400
Branch: REL_11_STABLE [b7d1f32ff] 2021-05-10 11:02:29 -0400
Branch: REL_10_STABLE [52a441362] 2021-05-10 11:02:30 -0400
Branch: REL9_6_STABLE [0fcb8e2e0] 2021-05-10 11:02:30 -0400
-->
     <para>
      Fix mishandling of <quote>junk</quote> columns in <literal>INSERT
      ... ON CONFLICT ... UPDATE</literal> target lists (Tom Lane)
     </para>

     <para>
      If the <literal>UPDATE</literal> list contains any multi-column
      sub-selects (which give rise to junk columns in addition to the
      results proper), the <literal>UPDATE</literal> path would end up
      storing tuples that include the values of the extra junk columns.
      That's fairly harmless in the short run, but if new columns are
      added to the table then the values would become accessible, possibly
      leading to malfunctions if they don't match the datatypes of the
      added columns.
     </para>

     <para>
      In addition, in versions supporting cross-partition updates,
      a cross-partition update triggered by such a case had the reverse
      problem: the junk columns were removed from the target list,
      typically causing an immediate crash due to malfunction of the
      multi-column sub-select mechanism.
      (CVE-2021-32028)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_13_STABLE [a71cfc56b] 2021-04-22 11:46:41 -0400
Branch: REL_12_STABLE [3fb93103a] 2021-04-22 11:46:41 -0400
Branch: REL_11_STABLE [27835b547] 2021-04-22 11:46:41 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d479d0028] 2021-04-22 17:30:55 -0400
Branch: REL_13_STABLE [2602ee468] 2021-04-22 17:30:42 -0400
Branch: REL_12_STABLE [05ce4bf8b] 2021-04-22 17:30:42 -0400
-->
     <para>
      Fix possibly-incorrect computation of <command>UPDATE
      ... RETURNING</command> outputs for joined cross-partition updates
      (Amit Langote, Etsuro Fujita)
     </para>

     <para>
      If an <command>UPDATE</command> for a partitioned table caused a row
      to be moved to another partition with a physically different row
      type (for example, one with a different set of dropped columns),
      computation of <literal>RETURNING</literal> results for that row
      could produce errors or wrong answers.  No error is observed unless
      the <command>UPDATE</command> involves other tables being joined to
      the target table.
      (CVE-2021-32029)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [6f70d7ca1] 2021-05-05 12:21:50 -0400
Branch: REL_13_STABLE [923c13520] 2021-05-05 12:14:21 -0400
Branch: REL_12_STABLE [abce26c9e] 2021-05-05 12:14:21 -0400
Branch: REL_11_STABLE [a25b98d2c] 2021-05-05 12:14:21 -0400
-->
     <para>
      Fix adjustment of constraint deferrability properties in
      partitioned tables (&Aacute;lvaro Herrera)
     </para>

     <para>
      When applied to a foreign-key constraint of a partitioned table,
      <command>ALTER TABLE ... ALTER CONSTRAINT</command> failed to
      adjust the <literal>DEFERRABLE</literal> and/or
      <literal>INITIALLY DEFERRED</literal> markings of the constraints
      and triggers of leaf partitions.  This led to unexpected behavior of
      such constraints.  After updating to this version, any misbehaving
      partitioned tables can be fixed by executing a
      new <command>ALTER</command> command to set the desired properties.
     </para>

     <para>
      This change also disallows applying such an <command>ALTER</command>
      directly to the constraints of leaf partitions.  The only supported
      case is for the whole partitioning hierarchy to have identical
      constraint properties, so such <command>ALTER</command>s must be
      applied at the partition root.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [a970edbed] 2021-05-04 12:09:08 +0200
Branch: REL_13_STABLE [64190d65f] 2021-05-04 12:10:22 +0200
Branch: REL_12_STABLE [13ff139a2] 2021-05-04 12:10:51 +0200
-->
     <para>
      When attaching a child table with <command>ALTER TABLE
      ... INHERIT</command>, insist that any generated columns in the
      parent be generated the same way in the child (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f52c5d674] 2021-03-12 11:08:42 -0500
Branch: REL_13_STABLE [8a2297776] 2021-03-12 11:08:42 -0500
Branch: REL_12_STABLE [e7f7950f6] 2021-03-12 11:08:42 -0500
Branch: REL_11_STABLE [6c34f186c] 2021-03-12 11:08:42 -0500
Branch: REL_10_STABLE [e5794cd59] 2021-03-12 11:08:42 -0500
-->
     <para>
      Forbid marking an identity column as nullable (Vik Fearing)
     </para>

     <para>
      <literal>GENERATED ... AS IDENTITY</literal> implies <literal>NOT
      NULL</literal>, so don't allow it to be combined with an
      explicit <literal>NULL</literal> specification.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [69d5ca484] 2021-04-13 15:10:18 -0400
Branch: REL_13_STABLE [c39aa1e87] 2021-04-13 15:10:18 -0400
Branch: REL_12_STABLE [a7fcb6285] 2021-04-13 15:10:18 -0400
Branch: REL_11_STABLE [c7f0275fb] 2021-04-13 15:10:18 -0400
Branch: REL_10_STABLE [46b6635b7] 2021-04-13 15:10:18 -0400
Branch: REL9_6_STABLE [041f4efd2] 2021-04-13 15:10:18 -0400
-->
     <para>
      Allow <literal>ALTER ROLE/DATABASE ... SET</literal> to set
      the <varname>role</varname>, <varname>session_authorization</varname>,
      and <varname>temp_buffers</varname> parameters (Tom Lane)
     </para>

     <para>
      Previously, over-eager validity checks might reject these commands,
      even if the values would have worked when used later.  This created
      a command ordering hazard for dump/reload and upgrade scenarios.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [bd1208098] 2021-02-10 13:06:48 +0900
Branch: REL_13_STABLE [849383138] 2021-02-10 13:09:09 +0900
Branch: REL_12_STABLE [85edb1f26] 2021-02-10 13:09:12 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [4f4726005] 2021-02-10 16:59:04 +0900
Branch: REL_13_STABLE [c6cd20d91] 2021-02-10 16:59:33 +0900
Branch: REL_12_STABLE [5b2945ec0] 2021-02-10 16:59:43 +0900
-->
     <para>
      Ensure that <command>REINDEX CONCURRENTLY</command> preserves any
      statistics target that's been set for the index (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [8a55cb5ba] 2021-02-19 21:57:52 +0900
Branch: REL_13_STABLE [422012c98] 2021-02-19 21:58:43 +0900
Branch: REL_12_STABLE [fadcc4e81] 2021-02-19 21:59:26 +0900
-->
     <para>
      Fix <command>COMMIT AND CHAIN</command> to work correctly when the
      current transaction has live savepoints (Fujii Masao)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c402b02b9] 2021-04-12 14:37:49 -0400
Branch: REL_13_STABLE [8a7bd1e6c] 2021-04-12 14:37:22 -0400
Branch: REL_12_STABLE [27011bcff] 2021-04-12 14:37:22 -0400
Branch: REL_11_STABLE [fb2cca828] 2021-04-12 14:37:22 -0400
Branch: REL_10_STABLE [4b0aecee8] 2021-04-12 14:37:22 -0400
Branch: REL9_6_STABLE [a6158a4d9] 2021-04-12 14:37:22 -0400
-->
     <para>
      Fix bug with coercing the result of a <literal>COLLATE</literal>
      expression to a non-collatable type (Tom Lane)
     </para>

     <para>
      This led to a parse tree in which the <literal>COLLATE</literal>
      appears to be applied to a non-collatable value.  While that
      normally has no real impact (since <literal>COLLATE</literal> has no
      effect at runtime), it was possible to construct views that would be
      rejected during dump/reload.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [25936fd46] 2021-02-27 18:09:15 -0300
Branch: REL_13_STABLE [2688852a4] 2021-02-27 18:09:15 -0300
Branch: REL_12_STABLE [262eb990c] 2021-02-27 18:09:15 -0300
-->
     <para>
      Fix use-after-free bug in saving tuples for <literal>AFTER</literal>
      triggers (Amit Langote)
     </para>

     <para>
      This could cause crashes in some situations.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2efcd502e] 2021-04-30 14:10:26 -0400
Branch: REL_13_STABLE [4d225ba0e] 2021-04-30 14:10:26 -0400
Branch: REL_12_STABLE [89768ee69] 2021-04-30 14:10:26 -0400
Branch: REL_11_STABLE [ebc2ff076] 2021-04-30 14:10:26 -0400
Branch: REL_10_STABLE [0627f3630] 2021-04-30 14:10:26 -0400
Branch: REL9_6_STABLE [73bad52a9] 2021-04-30 14:10:26 -0400
-->
     <para>
      Disallow calling window functions and procedures via
      the <quote>fast path</quote> wire protocol message (Tom Lane)
     </para>

     <para>
      Only plain functions are supported here.  While trying to call
      an aggregate function failed already, calling a window function
      would crash, and calling a procedure would work only if the
      procedure did no transaction control.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [f7aab36d6] 2021-04-28 11:17:58 +0900
Branch: REL_13_STABLE [f3c453787] 2021-04-28 11:18:17 +0900
Branch: REL_12_STABLE [7e76cb1d8] 2021-04-28 11:18:20 +0900
Branch: REL_11_STABLE [5b717e13c] 2021-04-28 11:18:24 +0900
Branch: REL_10_STABLE [90c9bad30] 2021-04-28 11:18:28 +0900
Branch: REL9_6_STABLE [6e41ff056] 2021-04-28 11:18:33 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [f93f0b5b2] 2021-04-28 11:58:08 +0900
Branch: REL_13_STABLE [a928297bc] 2021-04-28 11:58:43 +0900
Branch: REL_12_STABLE [85a3e0be1] 2021-04-28 11:58:46 +0900
Branch: REL_11_STABLE [669f73666] 2021-04-28 11:58:50 +0900
Branch: REL_10_STABLE [b797918d2] 2021-04-28 11:58:55 +0900
Branch: REL9_6_STABLE [0d05a3a1d] 2021-04-28 11:59:00 +0900
-->
     <para>
      Extend <function>pg_identify_object_as_address()</function>
      to support event triggers (Joel Jacobson)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [7a3972597] 2021-04-12 11:30:50 +0900
Branch: REL_13_STABLE [be79debd9] 2021-04-12 11:31:26 +0900
Branch: REL_12_STABLE [82dd5706e] 2021-04-12 11:31:30 +0900
Branch: REL_11_STABLE [5656f2c3d] 2021-04-12 11:31:35 +0900
Branch: REL_10_STABLE [1cc110f68] 2021-04-12 11:31:40 +0900
Branch: REL9_6_STABLE [6540322fa] 2021-04-12 11:31:46 +0900
-->
     <para>
      Fix <function>to_char()</function>'s handling of Roman-numeral month
      format codes with negative intervals (Julien Rouhaud)
     </para>

     <para>
      Previously, such cases would usually cause a crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5c06abb9b] 2021-03-08 18:21:51 -0500
Branch: REL_13_STABLE [fe2b5386b] 2021-03-08 18:21:51 -0500
Branch: REL_12_STABLE [8fff8a874] 2021-03-08 18:21:51 -0500
Branch: REL_11_STABLE [ea42ccbce] 2021-03-08 18:21:51 -0500
Branch: REL_10_STABLE [37228ecde] 2021-03-08 18:21:51 -0500
-->
     <para>
      Check that the argument
      of <function>pg_import_system_collations()</function> is a valid
      schema OID (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b5a66e735] 2021-02-18 22:38:55 -0500
Branch: REL_13_STABLE [bf9d3a5f8] 2021-02-18 22:38:55 -0500
Branch: REL_12_STABLE [e7cddb5f2] 2021-02-18 22:38:55 -0500
Branch: REL_11_STABLE [6e6fecf49] 2021-02-18 22:38:55 -0500
Branch: REL_10_STABLE [b06450979] 2021-02-18 22:38:55 -0500
Branch: REL9_6_STABLE [ab208421e] 2021-02-18 22:38:55 -0500
-->
     <para>
      Fix use of uninitialized value while parsing an
      <literal>\{<replaceable>m</replaceable>,<replaceable>n</replaceable>\}</literal>
      quantifier in a BRE-mode regular expression (Tom Lane)
     </para>

     <para>
      This error could cause the quantifier to act non-greedy, that is
      behave like an
      <literal>{<replaceable>m</replaceable>,<replaceable>n</replaceable>}?</literal>
      quantifier would do in full regular expressions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [33e52ad9a] 2021-03-26 22:34:58 +0100
Branch: REL_13_STABLE [67251c82a] 2021-03-26 22:37:45 +0100
Branch: REL_12_STABLE [88acb0135] 2021-03-26 22:40:00 +0100
Branch: REL_11_STABLE [2a307df1b] 2021-03-26 22:44:01 +0100
Branch: REL_10_STABLE [e5eb40eed] 2021-03-26 22:46:15 +0100
-->
     <para>
      Don't ignore system columns when estimating the number of groups
      using extended statistics (Tomas Vondra)
     </para>

     <para>
      This led to strange estimates for queries such as <literal>SELECT
      ... GROUP BY a, b, ctid</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ae4867ec7] 2021-02-12 16:26:47 -0500
Branch: REL_13_STABLE [3a02d68a9] 2021-02-12 16:26:47 -0500
Branch: REL_12_STABLE [0347470b3] 2021-02-12 16:26:47 -0500
Branch: REL_11_STABLE [a28df6fa3] 2021-02-12 16:26:47 -0500
Branch: REL_10_STABLE [374f1cefe] 2021-02-12 16:26:47 -0500
Branch: REL9_6_STABLE [f4d781dae] 2021-02-12 16:26:47 -0500
-->
     <para>
      Avoid divide-by-zero when estimating selectivity of a regular
      expression with a very long fixed prefix (Tom Lane)
     </para>

     <para>
      This typically led to a <literal>NaN</literal> selectivity value,
      causing assertion failures or strange planner behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [23607a815] 2021-04-07 15:58:36 +0200
Branch: REL_13_STABLE [1aad1d181] 2021-04-07 15:59:30 +0200
Branch: REL_12_STABLE [847612fda] 2021-04-07 16:01:27 +0200
Branch: REL_11_STABLE [7d3a53461] 2021-04-07 16:02:51 +0200
Branch: REL_10_STABLE [e4f251be7] 2021-04-07 16:04:05 +0200
Branch: REL9_6_STABLE [df97ee6ea] 2021-04-07 16:05:21 +0200
-->
     <para>
      Fix access-off-the-end-of-the-table error in BRIN index bitmap scans
      (Tomas Vondra)
     </para>

     <para>
      If the page range size used by a BRIN index isn't a power of two,
      there were corner cases in which a bitmap scan could try to fetch
      pages past the actual end of the table, leading to <quote>could not
      open file</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [595b9cba2] 2021-03-22 08:30:53 +0900
Branch: REL_13_STABLE [6e5ce888a] 2021-03-22 08:31:01 +0900
Branch: REL_12_STABLE [4b1dd9b1e] 2021-03-22 08:31:05 +0900
Branch: REL_11_STABLE [f1d550f18] 2021-03-22 08:31:09 +0900
Branch: REL_10_STABLE [1ec7162a8] 2021-03-22 08:31:14 +0900
-->
     <para>
      Avoid incorrect timeline change while recovering uncommitted
      two-phase transactions from WAL (Soumyadeep Chakraborty, Jimmy Yih,
      Kevin Yeap)
     </para>

     <para>
      This error could lead to subsequent WAL records being written under
      the wrong timeline ID, leading to consistency problems, or even
      complete failure to be able to restart the server, later on.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [ad8b67492] 2021-04-06 02:25:37 +0900
Branch: REL_13_STABLE [e7bcfd717] 2021-04-06 02:27:11 +0900
Branch: REL_12_STABLE [dd5b7e486] 2021-04-06 02:27:22 +0900
Branch: REL_11_STABLE [b59d3abaf] 2021-04-06 02:27:30 +0900
Branch: REL_10_STABLE [b9cf9d7d3] 2021-04-06 02:27:39 +0900
Branch: REL9_6_STABLE [e3bf96216] 2021-04-06 02:27:48 +0900
-->
     <para>
      Ensure that locks are released while shutting down a standby
      server's startup process (Fujii Masao)
     </para>

     <para>
      When a standby server is shut down while still in recovery, some
      locks might be left held.  This causes assertion failures in debug
      builds; it's unclear whether any serious consequence could occur
      in production builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [4e8c0f1a0] 2021-05-07 11:46:37 -0400
Branch: REL_13_STABLE [ef70b6f8e] 2021-05-07 11:46:37 -0400
Branch: REL_12_STABLE [cfebc7080] 2021-05-07 11:46:37 -0400
Branch: REL_11_STABLE [b40865ebd] 2021-05-07 11:46:37 -0400
Branch: REL_10_STABLE [1803c7626] 2021-05-07 11:46:37 -0400
-->
     <para>
      Fix crash when a logical replication worker does <command>ALTER
      SUBSCRIPTION REFRESH</command> (Peter Smith)
     </para>

     <para>
      The core code won't do this, but a replica trigger could.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [f900a79ec] 2021-02-15 16:04:59 +1300
Branch: REL_13_STABLE [6c23e5ae9] 2021-02-15 16:05:42 +1300
Branch: REL_12_STABLE [a27f3a7f4] 2021-02-15 16:06:18 +1300
Branch: REL_11_STABLE [1fefe8879] 2021-02-15 16:06:25 +1300
Branch: REL_10_STABLE [800131df7] 2021-02-15 16:08:24 +1300
Branch: REL9_6_STABLE [09a3b19e3] 2021-02-15 16:09:14 +1300
-->
     <para>
      Ensure we default to <varname>wal_sync_method</varname>
      = <literal>fdatasync</literal> on recent FreeBSD (Thomas Munro)
     </para>

     <para>
      FreeBSD 13 supports <literal>open_datasync</literal>, which would
      normally become the default choice.  However, it's unclear whether
      that is actually an improvement for Postgres, so preserve the
      existing default for now.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [e798d095d] 2021-05-04 10:09:12 -0400
Branch: REL_13_STABLE [91a6b3862] 2021-05-04 10:09:11 -0400
Branch: REL_12_STABLE [72fabd4bf] 2021-05-04 10:09:11 -0400
-->
     <para>
      Pass the correct trigger OID to object post-alter hooks
      during <command>ALTER CONSTRAINT</command> (&Aacute;lvaro Herrera)
     </para>

     <para>
      When updating trigger properties during <command>ALTER
      CONSTRAINT</command>, the post-alter hook was told that we are
      updating a trigger, but the constraint's OID was passed instead of
      the trigger's.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [637668fb1] 2021-02-15 14:27:33 +1300
Branch: REL_13_STABLE [9fe40913c] 2021-02-15 14:20:42 +1300
Branch: REL_12_STABLE [840eda04e] 2021-02-15 14:20:52 +1300
Branch: REL_11_STABLE [acafdd9ed] 2021-02-15 14:21:01 +1300
Branch: REL_10_STABLE [4b426f77c] 2021-02-15 14:22:08 +1300
Branch: REL9_6_STABLE [8a07e5bd8] 2021-02-15 14:22:19 +1300
-->
     <para>
      Ensure we finish cleaning up when interrupted while detaching a DSM
      segment (Thomas Munro)
     </para>

     <para>
      This error could result in temporary files not being cleaned up
      promptly after a parallel query.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_12_STABLE [992cba94d] 2021-03-20 12:38:22 -0400
Branch: REL_11_STABLE [c49e287a8] 2021-03-20 12:38:22 -0400
Branch: REL_10_STABLE [7d9629ed2] 2021-03-20 12:38:22 -0400
-->
     <para>
      Fix memory leak while initializing server's SSL parameters (Michael
      Paquier)
     </para>

     <para>
      This is ordinarily insignificant, but if the postmaster is
      repeatedly sent <systemitem>SIGHUP</systemitem> signals, the leak
      can build up over time.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e835e89a0] 2021-03-20 12:47:21 -0400
Branch: REL_13_STABLE [4b41f6923] 2021-03-20 12:47:35 -0400
Branch: REL_12_STABLE [2f31414f4] 2021-03-20 12:47:42 -0400
Branch: REL_11_STABLE [8c830148d] 2021-03-20 12:47:48 -0400
Branch: REL_10_STABLE [ad6c19066] 2021-03-20 12:47:53 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9bacdf9f5] 2021-03-18 22:22:47 -0400
Branch: REL_13_STABLE [12354839e] 2021-03-18 22:21:58 -0400
Branch: REL_12_STABLE [4eca51d44] 2021-03-18 22:21:58 -0400
Branch: REL_11_STABLE [20f11ca0d] 2021-03-18 22:21:58 -0400
Branch: REL_10_STABLE [ba986b7bc] 2021-03-18 22:21:58 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [377b7a830] 2021-03-18 22:22:47 -0400
Branch: REL_13_STABLE [642b0b69b] 2021-03-18 22:09:41 -0400
Branch: REL_12_STABLE [fc552f868] 2021-03-18 22:09:41 -0400
Branch: REL_11_STABLE [26a3ae06d] 2021-03-18 22:09:41 -0400
Branch: REL_10_STABLE [5058e95a6] 2021-03-18 22:09:41 -0400
Branch: REL9_6_STABLE [7e2521770] 2021-03-18 22:09:41 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d303849b0] 2021-03-18 22:22:47 -0400
Branch: REL_13_STABLE [eba939551] 2021-03-18 21:44:43 -0400
Branch: REL_12_STABLE [92bc14a10] 2021-03-18 21:44:43 -0400
Branch: REL_11_STABLE [099d2914f] 2021-03-18 21:44:43 -0400
Branch: REL_10_STABLE [0b618ddf8] 2021-03-18 21:44:43 -0400
Branch: REL9_6_STABLE [09e961929] 2021-03-18 21:44:43 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [415ffdc22] 2021-03-18 22:22:47 -0400
Branch: REL_13_STABLE [ea3989f34] 2021-03-18 20:50:56 -0400
Branch: REL_12_STABLE [1452a0bb8] 2021-03-18 20:50:56 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [28644fac1] 2021-03-18 22:22:47 -0400
Branch: REL_13_STABLE [536836970] 2021-03-18 20:37:09 -0400
Branch: REL_12_STABLE [fbcc9fe33] 2021-03-18 20:37:09 -0400
Branch: REL_11_STABLE [967b693ea] 2021-03-18 20:37:09 -0400
Branch: REL_10_STABLE [2bed650c4] 2021-03-18 20:37:09 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4b12ab18c] 2021-03-16 16:03:06 -0400
Branch: REL_13_STABLE [4d072bf2a] 2021-03-16 16:02:49 -0400
Branch: REL_12_STABLE [6e3475556] 2021-03-16 16:02:49 -0400
Branch: REL_11_STABLE [a2764d87d] 2021-03-16 16:02:50 -0400
Branch: REL_10_STABLE [7ce7f2b79] 2021-03-16 16:02:50 -0400
-->
     <para>
      Fix assorted minor memory leaks in the server (Tom Lane, Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c2db458c1] 2021-04-13 13:37:07 -0400
Branch: REL_13_STABLE [97b7ad468] 2021-04-13 13:37:07 -0400
Branch: REL_12_STABLE [6530df6c2] 2021-04-13 13:37:07 -0400
Branch: REL_11_STABLE [22f2a98cf] 2021-04-13 13:37:07 -0400
-->
     <para>
      Fix failure when a PL/pgSQL <command>DO</command> block makes use of
      both composite-type variables and transaction control (Tom Lane)
     </para>

     <para>
      Previously, such cases led to errors about leaked tuple descriptors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [51c54bb60] 2021-03-11 14:43:45 -0500
Branch: REL_13_STABLE [3580b4a0c] 2021-03-11 14:43:45 -0500
Branch: REL_12_STABLE [56defbdd0] 2021-03-11 14:43:45 -0500
Branch: REL_11_STABLE [d3a557894] 2021-03-11 14:43:45 -0500
Branch: REL_10_STABLE [d2be6cdc5] 2021-03-11 14:43:45 -0500
Branch: REL9_6_STABLE [a98e53e10] 2021-03-11 14:43:45 -0500
-->
     <para>
      Prevent infinite loop in <application>libpq</application>
      if a ParameterDescription message with a corrupt length is received
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [75dbfe4ca] 2021-03-02 15:39:34 -0300
Branch: REL_13_STABLE [b52fd1e7c] 2021-03-02 15:39:34 -0300
Branch: REL_12_STABLE [f92776791] 2021-03-02 15:39:34 -0300
Branch: REL_11_STABLE [ae1c1d84e] 2021-03-02 15:39:34 -0300
Branch: REL_10_STABLE [926139dd0] 2021-03-02 15:39:34 -0300
-->
     <para>
      When <application>initdb</application> prints instructions about how
      to start the server, make the path shown
      for <application>pg_ctl</application> use backslash separators on
      Windows (Nitin Jadhav)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ea8013854] 2021-03-23 14:27:50 -0400
Branch: REL_13_STABLE [c6eac71a8] 2021-03-23 14:27:50 -0400
Branch: REL_12_STABLE [beac4bd65] 2021-03-23 14:27:50 -0400
Branch: REL_11_STABLE [d75edab42] 2021-03-23 14:27:50 -0400
Branch: REL_10_STABLE [d5a905ed5] 2021-03-23 14:27:50 -0400
Branch: REL9_6_STABLE [4f670c64e] 2021-03-23 14:27:50 -0400
-->
     <para>
      Fix <application>psql</application> to restore the previous behavior
      of <literal>\connect
      service=<replaceable>something</replaceable></literal> (Tom Lane)
     </para>

     <para>
      A previous bug fix caused environment variables (such
      as <varname>PGPORT</varname>) to override entries in the service
      file in this context.  Restore the previous behavior, in which the
      priority is the other way around.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [fe06819f1] 2021-02-19 22:01:25 +0900
Branch: REL_13_STABLE [be7485a1e] 2021-02-19 22:02:19 +0900
Branch: REL_12_STABLE [67b3ee292] 2021-02-19 22:02:44 +0900
-->
     <para>
      Fix <application>psql</application>'s <literal>ON_ERROR_ROLLBACK</literal>
      feature to handle <literal>COMMIT AND CHAIN</literal> commands
      correctly (Arthur Nascimento)
     </para>

     <para>
      Previously, this case failed with <quote>savepoint
      "pg_psql_temporary_savepoint" does not exist</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [48d67fd89] 2021-03-12 12:20:15 -0500
Branch: REL_13_STABLE [6ed059933] 2021-03-12 12:20:15 -0500
Branch: REL_12_STABLE [60e5c2b14] 2021-03-12 12:20:15 -0500
Branch: REL_11_STABLE [33aa7d13d] 2021-03-12 12:20:15 -0500
Branch: REL_10_STABLE [8915e7906] 2021-03-12 12:20:15 -0500
Branch: REL9_6_STABLE [a42c4438b] 2021-03-12 12:20:15 -0500
-->
     <para>
      Fix race condition in detection of file modification by
      <application>psql</application>'s <literal>\e</literal> and related
      commands (Laurenz Albe)
     </para>

     <para>
      A very fast typist could fool the code's file-timestamp-based
      detection of whether the temporary edit file was changed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [feb270d10] 2021-05-04 14:18:16 +0200
Branch: REL_13_STABLE [a6a3a274a] 2021-05-04 14:18:23 +0200
Branch: REL_12_STABLE [bdaa0d2d7] 2021-05-04 14:18:33 +0200
-->
     <para>
      Fix <application>pg_dump</application>'s dumping of
      generated columns in partitioned tables (Peter Eisentraut)
     </para>

     <para>
      A fix introduced in the previous minor release should not be applied
      to partitioned tables, only traditionally-inherited tables.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ec03f2df1] 2021-04-01 13:34:16 -0400
Branch: REL_13_STABLE [35421a470] 2021-04-01 13:34:16 -0400
Branch: REL_12_STABLE [84c5e0dd2] 2021-04-01 13:34:16 -0400
Branch: REL_11_STABLE [25fe401d5] 2021-04-01 13:34:16 -0400
Branch: REL_10_STABLE [1b6961c8f] 2021-04-01 13:34:16 -0400
Branch: REL9_6_STABLE [2c9b857af] 2021-04-01 13:34:16 -0400
-->
     <para>
      Fix missed file version check
      in <application>pg_restore</application> (Tom Lane)
     </para>

     <para>
      When reading a custom-format archive from a non-seekable source,
      <application>pg_restore</application> neglected to check the
      archive version.  If it was fed a newer archive version than it
      can support, it would fail messily later on.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [57c081de0] 2021-04-29 15:24:37 -0400
Branch: REL_13_STABLE [bbcfee0e5] 2021-04-29 15:24:37 -0400
Branch: REL_12_STABLE [ba86371b9] 2021-04-29 15:24:37 -0400
Branch: REL_11_STABLE [404946d40] 2021-04-29 15:24:37 -0400
Branch: REL_10_STABLE [d5722c927] 2021-04-29 15:24:37 -0400
Branch: REL9_6_STABLE [54a233071] 2021-04-29 15:24:38 -0400
-->
     <para>
      Add some more checks to <application>pg_upgrade</application> for
      user tables containing non-upgradable data types (Tom Lane)
     </para>

     <para>
      Fix detection of some cases where a non-upgradable data type is
      embedded within a container type (such as an array or range).
      Also disallow upgrading when user tables contain columns of
      system-defined composite types, since those types' OIDs are not
      stable across versions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [2eb1fc8b1] 2021-04-03 00:07:00 +0900
Branch: REL_13_STABLE [104164361] 2021-04-03 00:07:49 +0900
Branch: REL_12_STABLE [24bcce3bd] 2021-04-03 00:08:05 +0900
-->
     <para>
      Fix incorrect progress-reporting calculation
      in <application>pg_checksums</application> (Shinya Kato)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [51893c846] 2021-03-23 09:53:08 +0900
Branch: REL_13_STABLE [34279fd4f] 2021-03-23 09:54:38 +0900
Branch: REL_12_STABLE [4220e06f4] 2021-03-23 09:54:59 +0900
Branch: REL_11_STABLE [4a2627c41] 2021-03-23 09:55:21 +0900
Branch: REL_10_STABLE [5386a8506] 2021-03-23 09:55:33 +0900
Branch: REL9_6_STABLE [e73068b07] 2021-03-23 09:55:49 +0900
-->
     <para>
      Fix <application>pg_waldump</application> to
      count <literal>XACT</literal> records correctly when generating
      per-record statistics (Kyotaro Horiguchi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [8deb6b38d] 2021-02-23 17:30:21 -0300
Branch: REL_13_STABLE [28f4b6108] 2021-02-23 17:30:21 -0300
Branch: REL_12_STABLE [2796ae2ad] 2021-02-23 17:30:21 -0300
Branch: REL_11_STABLE [258391707] 2021-02-23 17:30:21 -0300
Branch: REL_10_STABLE [bf518fefa] 2021-02-23 17:30:21 -0300
Branch: REL9_6_STABLE [0ccebe779] 2021-02-23 17:30:21 -0300
-->
     <para>
      Fix <filename>contrib/amcheck</filename> to not complain about the
      tuple flags <literal>HEAP_XMAX_LOCK_ONLY</literal>
      and <literal>HEAP_KEYS_UPDATED</literal> both being set
      (Julien Rouhaud)
     </para>

     <para>
      This is a valid state after <literal>SELECT FOR UPDATE</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [455dbc010] 2021-04-12 19:24:41 -0700
Branch: REL_13_STABLE [13881199e] 2021-04-12 19:24:58 -0700
Branch: REL_12_STABLE [4749c7ff4] 2021-04-12 19:27:09 -0700
Branch: REL_11_STABLE [c8da16ba1] 2021-04-12 19:27:31 -0700
Branch: REL_10_STABLE [fb9812b6c] 2021-04-12 19:27:36 -0700
Branch: REL9_6_STABLE [f488d19f3] 2021-04-12 19:27:38 -0700
-->
     <para>
      Adjust VPATH build rules to support recent Oracle Developer Studio
      compiler versions (Noah Misch)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [c3556f6fa] 2021-04-12 19:24:21 -0700
Branch: REL_13_STABLE [766c8fce5] 2021-04-12 19:24:24 -0700
Branch: REL_12_STABLE [e3ac7d176] 2021-04-12 19:24:25 -0700
Branch: REL_11_STABLE [4a3de4092] 2021-04-12 19:24:25 -0700
Branch: REL_10_STABLE [72a9bd047] 2021-04-12 19:24:25 -0700
Branch: REL9_6_STABLE [14652a19f] 2021-04-12 19:24:26 -0700
-->
     <para>
      Fix testing of PL/Python for Python 3 on Solaris (Noah Misch)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-6">
  <title>Release 12.6</title>

  <formalpara>
  <title>Release date:</title>
  <para>2021-02-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.5.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.6</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, see the second and third changelog items below,
    which describe cases in which reindexing indexes after the upgrade
    may be advisable.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 12.2,
    see <xref linkend="release-12-2"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [6214e2b22] 2021-02-08 11:01:51 +0200
Branch: REL_13_STABLE [8e56684d5] 2021-02-08 11:01:55 +0200
Branch: REL_12_STABLE [f50e88899] 2021-02-08 11:01:55 +0200
Branch: REL_11_STABLE [cb5868cc1] 2021-02-08 11:01:55 +0200
-->
     <para>
      Fix information leakage in constraint-violation error messages
      (Heikki Linnakangas)
     </para>

     <para>
      If an <command>UPDATE</command> command attempts to move a row to a
      different partition but finds that it violates some constraint on
      the new partition, and the columns in that partition are in
      different physical positions than in the parent table, the error
      message could reveal the contents of columns that the user does not
      have <literal>SELECT</literal> privilege on.
      (CVE-2021-3393)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [6b4d3046f] 2021-01-20 11:58:03 +0200
Branch: REL_13_STABLE [b8403d140] 2021-01-20 11:58:25 +0200
Branch: REL_12_STABLE [0326635dd] 2021-01-20 11:58:27 +0200
-->
     <para>
      Fix incorrect detection of concurrent page splits while inserting
      into a GiST index (Heikki Linnakangas)
     </para>

     <para>
      Concurrent insertions could lead to a corrupt index with entries
      placed in the wrong pages.  It's recommended to reindex any GiST
      index that's been subject to concurrent insertions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [8a54e12a3] 2021-01-30 00:00:27 -0800
Branch: REL_13_STABLE [86a5b309c] 2021-01-30 00:00:42 -0800
Branch: REL_12_STABLE [be843ce29] 2021-01-30 00:01:56 -0800
Branch: REL_11_STABLE [d1ab4bf6e] 2021-01-30 00:02:08 -0800
Branch: REL_10_STABLE [179775135] 2021-01-30 00:02:11 -0800
Branch: REL9_6_STABLE [d683d6528] 2021-01-30 00:04:05 -0800
Branch: REL9_5_STABLE [77a0e14f0] 2021-01-30 00:05:34 -0800
-->
     <para>
      Fix <command>CREATE INDEX CONCURRENTLY</command> to wait for
      concurrent prepared transactions (Andrey Borodin)
     </para>

     <para>
      At the point where <command>CREATE INDEX CONCURRENTLY</command>
      waits for all concurrent transactions to complete so that it can see
      rows they inserted, it must also wait for all prepared transactions
      to complete, for the same reason.  Its failure to do so meant that
      rows inserted by prepared transactions might be omitted from the new
      index, causing queries relying on the index to miss such rows.
      In installations that have enabled prepared transactions
      (<varname>max_prepared_transactions</varname> &gt; 0),
      it's recommended to reindex any concurrently-built indexes in
      case this problem occurred when they were built.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9624321ec] 2021-02-03 19:38:43 -0500
Branch: REL_13_STABLE [57868d957] 2021-02-03 19:38:29 -0500
Branch: REL_12_STABLE [77e760d5c] 2021-02-03 19:38:29 -0500
Branch: REL_11_STABLE [1c3a87746] 2021-02-03 19:38:29 -0500
-->
     <para>
      Avoid crash when a <literal>CALL</literal> or <literal>DO</literal>
      statement that performs a transaction rollback is executed via
      extended query protocol (Thomas Munro, Tom Lane)
     </para>

     <para>
      In <productname>PostgreSQL</productname> 13, this case reliably
      caused a null-pointer dereference.  In earlier versions the bug
      seems to have no visible symptoms, but it's not quite clear that
      it could never cause a problem.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1d9351a87] 2021-01-28 13:41:55 -0500
Branch: REL_13_STABLE [7f1921cb9] 2021-01-28 13:41:55 -0500
Branch: REL_12_STABLE [7c53a8067] 2021-01-28 13:41:55 -0500
Branch: REL_11_STABLE [6f94531b0] 2021-01-28 13:41:55 -0500
-->
     <para>
      Fix partition pruning logic to handle asymmetric hash partition sets
      (Tom Lane)
     </para>

     <para>
      If a hash-partitioned table has unequally-sized partitions (that is,
      varying modulus values), or it lacks partitions for some remainder
      values, then the planner's pruning logic could mistakenly conclude
      that some partitions don't need to be scanned, leading to failure to
      find rows that the query should find.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a0efda88a] 2021-01-19 13:25:33 -0500
Branch: REL_13_STABLE [188cd4f44] 2021-01-19 13:25:40 -0500
Branch: REL_12_STABLE [625315996] 2021-01-19 13:25:45 -0500
Branch: REL_11_STABLE [794562d07] 2021-01-19 13:25:49 -0500
Branch: REL_10_STABLE [fac54bd5e] 2021-01-19 13:25:54 -0500
Branch: REL9_6_STABLE [fe8edbb82] 2021-01-19 13:26:01 -0500
Branch: REL9_5_STABLE [0ab177bec] 2021-01-19 13:26:05 -0500
-->
     <para>
      Avoid incorrect results when <literal>WHERE CURRENT OF</literal> is
      applied to a cursor whose plan contains a MergeAppend node (Tom
      Lane)
     </para>

     <para>
      This case is unsupported (in general, a cursor using <literal>ORDER
      BY</literal> is not guaranteed to be simply updatable); but the code
      previously did not reject it, and could silently give false matches.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [60661bbf2] 2021-01-18 18:32:30 -0500
Branch: REL_13_STABLE [f0f53195b] 2021-01-18 18:32:40 -0500
Branch: REL_12_STABLE [ba80489c6] 2021-01-18 18:32:45 -0500
Branch: REL_11_STABLE [de622e677] 2021-01-18 18:32:49 -0500
Branch: REL_10_STABLE [5cd94de77] 2021-01-18 18:32:55 -0500
Branch: REL9_6_STABLE [ffbf17463] 2021-01-18 18:33:02 -0500
Branch: REL9_5_STABLE [33a46993f] 2021-01-18 18:33:07 -0500
-->
     <para>
      Fix crash when <literal>WHERE CURRENT OF</literal> is applied to a
      cursor whose plan contains a custom scan node (David Geier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [55dc86eca] 2021-01-21 15:37:23 -0500
Branch: REL_13_STABLE [73fc2e5ba] 2021-01-21 15:37:23 -0500
Branch: REL_12_STABLE [1cce024fd] 2021-01-21 15:37:23 -0500
-->
     <para>
      Fix planner's mishandling of placeholders whose evaluation should be
      delayed by an outer join (Tom Lane)
     </para>

     <para>
      This occurs in particular with trivial subqueries containing lateral
      references to outer-join outputs.  The mistake could result in a
      malformed plan.  The known cases trigger a <quote>failed to assign
      all NestLoopParams to plan nodes</quote> error, but other symptoms
      may be possible.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e98c90099] 2020-12-05 16:16:13 -0500
Branch: REL_13_STABLE [7d43b76f6] 2020-12-05 16:16:13 -0500
Branch: REL_12_STABLE [77a94c30d] 2020-12-05 16:16:13 -0500
-->
     <para>
      Fix planner's handling of placeholders during removal of useless
      RESULT RTEs (Tom Lane)
     </para>

     <para>
      This oversight could lead to <quote>no relation entry for
      relid <replaceable>N</replaceable></quote> planner errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b1738ff6a] 2020-11-30 12:22:43 -0500
Branch: REL_13_STABLE [666a4de93] 2020-11-30 12:22:43 -0500
Branch: REL_12_STABLE [4f728a1f5] 2020-11-30 12:22:43 -0500
Branch: REL_11_STABLE [caecab229] 2020-11-30 12:22:43 -0500
Branch: REL_10_STABLE [785f4462d] 2020-11-30 12:22:43 -0500
Branch: REL9_6_STABLE [ab4cbb4bc] 2020-11-30 12:22:43 -0500
Branch: REL9_5_STABLE [8c5da2d51] 2020-11-30 12:22:43 -0500
-->
     <para>
      Fix planner's handling of a placeholder that is computed at some
      join level and used only at that same level (Tom Lane)
     </para>

     <para>
      This oversight could lead to <quote>failed to build
      any <replaceable>N</replaceable>-way joins</quote> planner errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [660b89928] 2020-11-24 21:58:32 +0000
Branch: REL_13_STABLE [6dda05704] 2020-11-24 21:16:58 +0000
Branch: REL_12_STABLE [ae5aa26dc] 2020-11-24 21:17:02 +0000
Branch: REL_11_STABLE [018e7d98d] 2020-11-24 21:18:37 +0000
Branch: REL_10_STABLE [321c87e5c] 2020-11-24 21:18:59 +0000
Branch: REL9_6_STABLE [6402afd98] 2020-11-24 21:19:50 +0000
Branch: REL9_5_STABLE [59ed45e27] 2020-11-24 21:36:09 +0000
-->
     <para>
      Be more careful about whether index AMs support mark/restore
      (Andrew Gierth)
     </para>

     <para>
      This prevents errors about missing support functions in rare edge
      cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master Release: REL_13_BR [d061ea21f] 2020-01-31 17:29:38 +1300
Branch: REL_12_STABLE [2ded1f1fb] 2020-11-20 10:51:30 +1300
Branch: REL_11_STABLE [0455f78dd] 2020-11-20 10:52:38 +1300
Branch: REL_10_STABLE [f5332503e] 2020-11-20 10:53:08 +1300
-->
     <para>
      Adjust settings to make it more difficult to run out of DSM slots
      during heavy usage of parallel queries (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [2ad78a87f] 2021-01-15 12:44:17 +0900
Branch: REL_13_STABLE [60369db86] 2021-01-15 12:45:25 +0900
Branch: REL_12_STABLE [19a1d7685] 2021-01-15 12:45:51 +0900
Branch: REL_11_STABLE [97b025ebe] 2021-01-15 12:46:26 +0900
-->
     <para>
      Fix overestimate of the amount of shared memory needed for parallel
      queries (Takayuki Tsunakawa)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [21378e1fe] 2021-01-20 11:38:17 +0900
Branch: REL_13_STABLE [31e0f9d76] 2021-01-20 11:39:14 +0900
Branch: REL_12_STABLE [5ad672fc2] 2021-01-20 11:39:17 +0900
Branch: REL_11_STABLE [1c3a4d44d] 2021-01-20 11:39:21 +0900
Branch: REL_10_STABLE [74ee3abcf] 2021-01-20 11:39:24 +0900
Branch: REL9_6_STABLE [7dc3be9df] 2021-01-20 11:39:31 +0900
Branch: REL9_5_STABLE [0ddb529cf] 2021-01-20 11:39:35 +0900
-->
     <para>
      Fix <command>ALTER DEFAULT PRIVILEGES</command> to handle duplicated
      arguments safely (Michael Paquier)
     </para>

     <para>
      Duplicate role or schema names within the same command could lead
      to <quote>tuple already updated by self</quote> errors or
      unique-constraint violations.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [08db7c63f] 2020-12-25 10:41:59 -0800
Branch: REL_13_STABLE [9f8a48bb2] 2020-12-25 10:42:02 -0800
Branch: REL_12_STABLE [c96698806] 2020-12-25 10:42:03 -0800
Branch: REL_11_STABLE [e83e8509b] 2020-12-25 10:42:03 -0800
Branch: REL_10_STABLE [d7c197f46] 2020-12-25 10:42:03 -0800
Branch: REL9_6_STABLE [b81d3791e] 2020-12-25 10:42:04 -0800
Branch: REL9_5_STABLE [90383a613] 2020-12-25 10:42:04 -0800
Branch: REL_10_STABLE [d176b9d5e] 2020-12-25 11:02:56 -0800
Branch: REL9_6_STABLE [3f920e876] 2020-12-25 11:03:05 -0800
Branch: REL9_5_STABLE [14649bf50] 2020-12-25 11:06:23 -0800
-->
     <para>
      Flush ACL-related caches when <structname>pg_authid</structname>
      changes (Noah Misch)
     </para>

     <para>
      This change ensures that permissions-related decisions will promptly
      reflect the results of <command>ALTER ROLE ... [NO] INHERIT</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f7f83a55b] 2020-12-01 14:02:27 -0500
Branch: REL_13_STABLE [dffc82a5b] 2020-12-01 14:02:27 -0500
Branch: REL_12_STABLE [5f9b05ada] 2020-12-01 14:02:28 -0500
Branch: REL_11_STABLE [28bb8c496] 2020-12-01 14:02:28 -0500
Branch: REL_10_STABLE [d98e27dc6] 2020-12-01 14:02:28 -0500
Branch: REL9_6_STABLE [f00c44002] 2020-12-01 14:02:28 -0500
Branch: REL9_5_STABLE [fb500296d] 2020-12-01 14:02:28 -0500
-->
     <para>
      Prevent misprocessing of ambiguous <command>CREATE TABLE
      LIKE</command> clauses (Tom Lane)
     </para>

     <para>
      A <literal>LIKE</literal> clause is re-examined after initial
      creation of the new table, to handle importation of indexes and
      such.  It was possible for this re-examination to find a different
      table of the same name, causing unexpected behavior; one example is
      where the new table is a temporary table of the same name as
      the <literal>LIKE</literal> target.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [97390fe8a] 2020-11-19 15:03:17 -0500
Branch: REL_13_STABLE [98f3f1d5c] 2020-11-19 15:03:17 -0500
Branch: REL_12_STABLE [87ab46421] 2020-11-19 15:03:17 -0500
Branch: REL_11_STABLE [c690ebbef] 2020-11-19 15:03:17 -0500
Branch: REL_10_STABLE [513db7b70] 2020-11-19 15:03:17 -0500
Branch: REL9_6_STABLE [159b6775f] 2020-11-19 15:03:17 -0500
Branch: REL9_5_STABLE [6631d5f26] 2020-11-19 15:03:17 -0500
-->
     <para>
      Rearrange order of operations in <command>CREATE TABLE
      LIKE</command> so that indexes are cloned before building foreign
      key constraints (Tom Lane)
     </para>

     <para>
      This fixes the case where a self-referential foreign key constraint
      declared in the outer <command>CREATE TABLE</command> depends on an
      index that's coming from the <literal>LIKE </literal> clause.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [c9a0dc348] 2021-01-15 23:31:22 +0100
Branch: REL_13_STABLE [d26d4c717] 2021-01-15 23:32:54 +0100
Branch: REL_12_STABLE [943a113bc] 2021-01-15 23:33:16 +0100
Branch: REL_11_STABLE [f52db9694] 2021-01-15 23:33:44 +0100
Branch: REL_10_STABLE [c22539756] 2021-01-15 23:34:02 +0100
-->
     <para>
      Disallow <command>CREATE STATISTICS</command> on system catalogs
      (Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [dd705a039] 2021-02-06 15:17:01 -0500
Branch: REL_13_STABLE [4353bc878] 2021-02-06 15:17:01 -0500
Branch: REL_12_STABLE [f73321957] 2021-02-06 15:17:01 -0500
Branch: REL_11_STABLE [580069037] 2021-02-06 15:17:02 -0500
Branch: REL_10_STABLE [ad85e5efa] 2021-02-06 15:17:02 -0500
Branch: REL9_6_STABLE [7736ab05f] 2021-02-06 15:17:02 -0500
Branch: REL9_5_STABLE [5ad03374b] 2021-02-06 15:17:02 -0500
-->
     <para>
      Disallow converting an inheritance child table to a view
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [9f35f9437] 2020-12-01 13:21:03 +1300
Branch: REL_13_STABLE [fd3a75d82] 2020-12-01 13:22:01 +1300
Branch: REL_12_STABLE [50f338574] 2020-12-01 13:37:00 +1300
Branch: REL_11_STABLE [d5706ad7b] 2020-12-01 13:46:27 +1300
Branch: REL_10_STABLE [22701755d] 2020-12-01 14:43:04 +1300
Branch: REL9_6_STABLE [d0bbe2122] 2020-12-01 14:50:41 +1300
Branch: REL9_5_STABLE [e00928de8] 2020-12-01 14:54:49 +1300
-->
     <para>
      Ensure that disk space allocated for a dropped relation is released
      promptly at commit (Thomas Munro)
     </para>

     <para>
      Previously, if the dropped relation spanned multiple 1GB segments,
      only the first segment was truncated immediately.  Other segments
      were simply unlinked, which doesn't authorize the kernel to release
      the storage so long as any other backends still have the files open.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [ebfe2dbd6] 2021-01-14 15:32:14 -0300
Branch: REL_13_STABLE [5b01a6f13] 2021-01-14 15:32:14 -0300
Branch: REL_12_STABLE [c9b702552] 2021-01-14 15:32:14 -0300
Branch: REL_11_STABLE [c442b32c2] 2021-01-14 15:32:14 -0300
-->
     <para>
      Prevent dropping a tablespace that is referenced by a partitioned
      relation, but is not used for any actual storage (&Aacute;lvaro
      Herrera)
     </para>

     <para>
      Previously this was allowed, but subsequent operations on the
      partitioned relation would fail.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [3df51ca8b] 2020-11-27 20:16:44 +0900
Branch: REL_13_STABLE [dcc20946a] 2020-11-27 20:17:33 +0900
Branch: REL_12_STABLE [fce17e486] 2020-11-27 20:18:02 +0900
-->
     <para>
      Fix progress reporting for <command>CLUSTER</command> (Matthias van
      de Meent)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [c444472af] 2021-02-05 11:14:56 +0200
Branch: REL_13_STABLE [c87cbd51e] 2021-02-05 11:19:48 +0200
Branch: REL_12_STABLE [9b0ce8957] 2021-02-05 11:16:33 +0200
Branch: REL_11_STABLE [d9b4163c5] 2021-02-05 11:16:53 +0200
Branch: REL_10_STABLE [c06632e48] 2021-02-05 11:17:07 +0200
Branch: REL9_6_STABLE [e152ccc7f] 2021-02-05 11:17:13 +0200
Branch: REL9_5_STABLE [aaf266157] 2021-02-05 11:17:27 +0200
-->
     <para>
      Fix handling of backslash-escaped multibyte characters
      in <command>COPY FROM</command> (Heikki Linnakangas)
     </para>

     <para>
      A backslash followed by a multibyte character was not handled
      correctly.  In some client character encodings, this could lead to
      misinterpreting part of a multibyte character as a field separator
      or end-of-copy-data marker.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [2cccb627f] 2020-11-18 12:39:15 +0200
Branch: REL_13_STABLE [340ae3cfb] 2020-11-20 14:41:14 +0200
Branch: REL_12_STABLE [888fa2bae] 2020-11-20 14:46:47 +0200
Branch: REL_11_STABLE [57b5d8484] 2020-11-20 14:49:25 +0200
Branch: REL_10_STABLE [1dbe627fd] 2020-11-20 14:49:42 +0200
Branch: REL9_6_STABLE [02a2dbe91] 2020-11-20 14:57:15 +0200
Branch: REL9_5_STABLE [ded7db4c1] 2020-11-20 14:57:51 +0200
-->
     <para>
      Avoid preallocating executor hash tables
      in <command>EXPLAIN</command> without <literal>ANALYZE</literal>
      (Alexey Bashtanov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9c83b54a9] 2020-11-28 14:03:40 -0500
Branch: REL_13_STABLE [f5de090cc] 2020-11-28 14:03:40 -0500
Branch: REL_12_STABLE [cbc7a7a10] 2020-11-28 14:03:40 -0500
Branch: REL_11_STABLE [40f2fbe71] 2020-11-28 14:03:40 -0500
Branch: REL_10_STABLE [f6324bbbe] 2020-11-28 14:03:40 -0500
Branch: REL9_6_STABLE [8a4069766] 2020-11-28 14:03:40 -0500
Branch: REL9_5_STABLE [60d6c7143] 2020-11-28 14:03:40 -0500
-->
     <para>
      Fix recently-introduced race conditions
      in <command>LISTEN</command>/<command>NOTIFY</command> queue
      handling (Tom Lane)
     </para>

     <para>
      A newly-listening backend could attempt to read SLRU pages that
      were in process of being truncated, possibly causing an error.
     </para>

     <para>
      The queue tail pointer could become
      set to a value that's not equal to the queue position of any
      backend, resulting in effective disabling of the queue truncation
      logic.  Continued use of <command>NOTIFY</command> then led to
      queue-fill warnings, and eventually to inability to send any more
      notifies until the server is restarted.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ff5d5611c] 2020-12-21 13:11:50 -0500
Branch: REL_13_STABLE [38d30a14b] 2020-12-21 13:11:51 -0500
Branch: REL_12_STABLE [38bef9e43] 2020-12-21 13:11:29 -0500
Branch: REL_11_STABLE [75c8ef5ae] 2020-12-21 13:11:29 -0500
Branch: REL_10_STABLE [542248f9d] 2020-12-21 13:11:30 -0500
Branch: REL9_6_STABLE [1d5f3f976] 2020-12-21 13:11:30 -0500
Branch: REL9_5_STABLE [edcdbc44e] 2020-12-21 13:11:30 -0500
-->
     <para>
      Allow the <type>jsonb</type> concatenation operator to handle all
      combinations of JSON data types (Tom Lane)
     </para>

     <para>
      We can concatenate two JSON objects or two JSON arrays.  Handle
      other cases by wrapping non-array inputs in one-element arrays,
      then performing an array concatenation.  Previously, some
      combinations of inputs followed this rule but others arbitrarily
      threw an error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [afcc8772e] 2021-01-08 12:16:00 -0500
Branch: REL_13_STABLE [49c928c0c] 2021-01-08 12:16:00 -0500
Branch: REL_12_STABLE [8354371d0] 2021-01-08 12:16:00 -0500
Branch: REL_11_STABLE [769908811] 2021-01-08 12:16:00 -0500
Branch: REL_10_STABLE [2d540ac5f] 2021-01-08 12:16:00 -0500
Branch: REL9_6_STABLE [085a1cfb3] 2021-01-08 12:16:00 -0500
Branch: REL9_5_STABLE [0c23f30fa] 2021-01-08 12:16:00 -0500
-->
     <para>
      Fix use of uninitialized value while parsing a <literal>*</literal>
      quantifier in a BRE-mode regular expression (Tom Lane)
     </para>

     <para>
      This error could cause the quantifier to act non-greedy, that is
      behave like a <literal>*?</literal> quantifier would do in full
      regular expressions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [bc43b7c2c] 2021-01-05 11:15:28 +0000
Branch: REL_13_STABLE [e15c384d7] 2021-01-05 11:08:59 +0000
Branch: REL_12_STABLE [258b77005] 2021-01-05 11:07:12 +0000
Branch: REL_11_STABLE [160a9e425] 2021-01-05 11:05:58 +0000
Branch: REL_10_STABLE [275b190b3] 2021-01-05 11:04:41 +0000
Branch: REL9_6_STABLE [9a299dff2] 2021-01-05 11:02:46 +0000
Branch: master [fead67c24] 2021-01-05 11:52:42 +0000
Branch: REL_13_STABLE [5777b6ea2] 2021-01-05 11:51:21 +0000
Branch: REL_12_STABLE [740780a61] 2021-01-05 11:50:11 +0000
Branch: REL_11_STABLE [ab042d010] 2021-01-05 11:48:45 +0000
Branch: REL_10_STABLE [0097193b1] 2021-01-05 11:46:44 +0000
Branch: REL9_6_STABLE [f0b9bada5] 2021-01-05 11:45:17 +0000
-->
     <para>
      Fix numeric <function>power()</function> for the case where the
      exponent is exactly <literal>INT_MIN</literal> (-2147483648)
      (Dean Rasheed)
     </para>

     <para>
      Previously, a result with no significant digits was produced.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4bd3fad80] 2021-01-04 18:32:44 -0500
Branch: REL_13_STABLE [9e7d87ca8] 2021-01-04 18:32:40 -0500
Branch: REL_12_STABLE [7c98759e0] 2021-01-04 18:32:40 -0500
Branch: REL_11_STABLE [50a420bee] 2021-01-04 18:32:40 -0500
-->
     <para>
      Fix integer-overflow cases in <function>substring()</function>
      functions (Tom Lane, Pavel Stehule)
     </para>

     <para>
      If the specified starting index and length overflow an integer when
      added together, <function>substring()</function> misbehaved, either
      throwing a bogus <quote>negative substring length</quote> error for
      a case that should succeed, or failing to complain that a negative
      length is negative (and instead returning the whole string, in most
      cases).
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [6db992833] 2021-01-16 12:21:35 -0800
Branch: REL_13_STABLE [6eb3fc7fc] 2021-01-16 12:21:38 -0800
Branch: REL_12_STABLE [66087f7e9] 2021-01-16 12:21:39 -0800
Branch: REL_11_STABLE [677f6cb1d] 2021-01-16 12:21:39 -0800
Branch: REL_10_STABLE [9afba9b0e] 2021-01-16 12:21:39 -0800
Branch: REL9_6_STABLE [1a31d8c52] 2021-01-16 12:21:39 -0800
Branch: REL9_5_STABLE [c424c75f5] 2021-01-16 12:21:39 -0800
-->
     <para>
      Prevent possible data loss from incorrect detection of the
      wraparound point of an SLRU log
      (Noah Misch)
     </para>

     <para>
      The wraparound point typically falls in the middle of a page, which
      must be rounded off to a page boundary, and that was not done
      correctly.  No issue could arise unless an installation had gotten
      to within one page of SLRU overflow, which is unlikely in a
      properly-functioning system.  If this did happen, it would manifest
      in later <quote>apparent wraparound</quote> or <quote>could not
      access status of transaction</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [ee1b38f65] 2021-01-13 08:19:50 +0530
Branch: REL_13_STABLE [0685c5c1b] 2021-01-13 08:31:45 +0530
Branch: REL_12_STABLE [0b2ae3c92] 2021-01-13 08:40:06 +0530
Branch: REL_11_STABLE [7adc408f4] 2021-01-13 08:50:13 +0530
Branch: REL_10_STABLE [636b6f99c] 2021-01-13 09:01:57 +0530
Branch: REL9_6_STABLE [f2b268ee0] 2021-01-13 09:12:59 +0530
Branch: REL9_5_STABLE [4bccceaa9] 2021-01-13 09:22:03 +0530
-->
     <para>
      Fix memory leak in walsender processes while sending new snapshots
      for logical decoding (Amit Kapila)
     </para>
    </listitem>

    <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
Branch: master [a58db3aa1] 2020-12-14 23:47:30 -0800
Branch: REL_13_STABLE [fde5f130c] 2020-12-14 23:48:44 -0800
Branch: REL_12_STABLE [706d84fe7] 2020-12-14 23:48:04 -0800
Branch: REL_11_STABLE [4ee058a3b] 2020-12-14 23:49:06 -0800
Branch: REL_10_STABLE [ac7df6e8f] 2020-12-14 23:49:29 -0800
Branch: REL9_6_STABLE [f10da1e9c] 2020-12-14 23:49:57 -0800
Branch: REL9_5_STABLE [133a0906d] 2020-12-14 23:50:20 -0800
-->
     <para>
      Fix walsender to accept additional commands after
      terminating replication (Jeff Davis)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [8900b5a9d] 2021-01-06 12:39:18 +0900
Branch: REL_13_STABLE [0f8977b3f] 2021-01-06 12:30:37 +0900
Branch: REL_12_STABLE [9f540f840] 2021-01-06 12:31:23 +0900
Branch: REL_11_STABLE [e83771880] 2021-01-06 12:31:55 +0900
Branch: REL_10_STABLE [4c20e78f1] 2021-01-06 12:32:32 +0900
Branch: REL9_6_STABLE [0307b98d8] 2021-01-06 12:33:28 +0900
-->
     <para>
      Ensure detection of deadlocks between hot standby backends and the
      startup (WAL-application) process (Fujii Masao)
     </para>

     <para>
      The startup process did not run the deadlock detection code, so that
      in situations where the startup process is last to join a circular
      wait situation, the deadlock might never be recognized.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [422881744] 2020-12-30 16:29:05 -0800
Branch: REL_13_STABLE [7a57960ba] 2020-12-30 16:29:03 -0800
Branch: REL_12_STABLE [4f70e0910] 2020-12-30 16:29:01 -0800
Branch: master [32d6287d2] 2020-12-30 17:21:42 -0800
Branch: REL_13_STABLE [55e535226] 2020-12-30 17:21:41 -0800
Branch: REL_12_STABLE [5f95664e1] 2020-12-30 17:21:39 -0800
-->
     <para>
      Fix possible failure to detect recovery conflicts while deleting an
      index entry that references a HOT chain (Peter Geoghegan)
     </para>

     <para>
      The code failed to traverse the HOT chain and might thus compute a
      too-old XID horizon, which could lead to incorrect conflict
      processing in hot standby.  The practical impact of this bug is
      limited; in most cases the correct XID horizon would be found anyway
      from nearby operations.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [860fe27ee] 2020-12-30 11:38:42 -0500
Branch: REL_13_STABLE [861e96717] 2020-12-30 11:38:42 -0500
Branch: REL_12_STABLE [3ca19490b] 2020-12-30 11:38:42 -0500
-->
     <para>
      Ensure that a nonempty value
      of <varname>krb_server_keyfile</varname> always overrides any
      setting of <varname>KRB5_KTNAME</varname> in the server's
      environment (Tom Lane)
     </para>

     <para>
      Previously, which setting took precedence depended on whether the
      client requests GSS encryption.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3995c4249] 2020-12-28 17:58:58 -0500
Branch: REL_13_STABLE [d05e14d78] 2020-12-28 17:58:58 -0500
Branch: REL_12_STABLE [7ed616f81] 2020-12-28 17:58:58 -0500
-->
     <para>
      In server log messages about failing to match connections
      to <filename>pg_hba.conf</filename> entries, include details about
      whether GSS encryption has been activated (Kyotaro Horiguchi, Tom
      Lane)
     </para>

     <para>
      This is relevant data if <literal>hostgssenc</literal>
      or <literal>hostnogssenc</literal> entries exist.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [622ae4621] 2020-12-28 17:44:17 -0500
Branch: REL_13_STABLE [c1c88bf03] 2020-12-28 17:44:17 -0500
Branch: REL_12_STABLE [4cfdd8a47] 2020-12-28 17:44:17 -0500
-->
     <para>
      Fix assorted issues in server's support for GSS encryption (Tom Lane)
     </para>

     <para>
      Remove pointless restriction that only GSS authentication
      can be used on a GSS-encrypted connection.
      Add GSS encryption information to connection-authorized log messages.
      Include GSS-related space when computing the required size of
      shared memory (this omission could have caused problems with very
      high <varname>max_connections</varname> settings).
      Avoid possible infinite recursion when reporting an unrecoverable
      GSS encryption error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7519bd16d] 2020-12-24 17:00:43 -0500
Branch: REL_13_STABLE [0217ad806] 2020-12-24 17:00:43 -0500
Branch: REL_12_STABLE [3d8068edc] 2020-12-24 17:00:43 -0500
Branch: REL_11_STABLE [b99b6b9d6] 2020-12-24 17:00:43 -0500
Branch: REL_10_STABLE [1a6b1c460] 2020-12-24 17:00:43 -0500
-->
     <para>
      Ensure that unserviced requests for background workers are cleaned
      up when the postmaster begins a <quote>smart</quote>
      or <quote>fast</quote> shutdown sequence (Tom Lane)
     </para>

     <para>
      Previously, there was a race condition whereby a child process that
      had requested a background worker just before shutdown could wait
      indefinitely, preventing shutdown from completing.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [6db27037b] 2020-12-23 12:51:22 +0900
Branch: REL_13_STABLE [1e54664ee] 2020-12-23 12:51:35 +0900
Branch: REL_12_STABLE [67a9411d2] 2020-12-23 12:51:39 +0900
Branch: REL_11_STABLE [35ad5c7c7] 2020-12-23 12:51:42 +0900
Branch: REL_10_STABLE [f3ee99df7] 2020-12-23 12:51:46 +0900
Branch: REL9_6_STABLE [0b54a80a3] 2020-12-23 12:51:51 +0900
-->
     <para>
      Fix portability problem in parsing
      of <varname>recovery_target_xid</varname> values (Michael Paquier)
     </para>

     <para>
      The target XID is potentially 64 bits wide, but it was parsed
      with <function>strtoul()</function>, causing misbehavior on
      platforms where <type>long</type> is 32 bits (such as Windows).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [275b3411d] 2020-11-30 14:38:00 -0500
Branch: REL_13_STABLE [fac31b2cd] 2020-11-30 14:38:00 -0500
Branch: REL_12_STABLE [16a1e1ea4] 2020-11-30 14:38:00 -0500
Branch: REL_11_STABLE [942e441ee] 2020-11-30 14:38:00 -0500
-->
     <para>
      Avoid trying to use parallel index build in a standalone backend
      (Yulin Pei)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [29d29d652] 2020-11-15 16:10:58 -0500
Branch: REL_13_STABLE [7c89246d0] 2020-11-15 16:10:48 -0500
Branch: REL_12_STABLE [4ac8ee9d4] 2020-11-15 16:10:48 -0500
Branch: REL_11_STABLE [9cebe4952] 2020-11-15 16:10:48 -0500
-->
     <para>
      Allow index AMs to support included columns without necessarily
      supporting multiple key columns (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [a3367aa3c] 2021-01-28 10:53:10 +0000
Branch: REL_13_STABLE [75e3cca42] 2021-01-28 11:09:40 +0000
Branch: REL_12_STABLE [30f912a41] 2021-01-28 11:09:49 +0000
Branch: REL_11_STABLE [f7f2a28d4] 2021-01-28 11:09:57 +0000
-->
     <para>
      Avoid assertion failure during parallel aggregation of an
      aggregate with a non-strict deserialization function (Andrew Gierth)
     </para>

     <para>
      No such aggregate functions exist in
      core <productname>PostgreSQL</productname>, but some extensions
      such as PostGIS provide some.  The mistake is harmless anyway in a
      non-assert build.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [07d46fceb] 2021-01-25 13:03:43 -0500
Branch: REL_13_STABLE [a26194f22] 2021-01-25 13:03:11 -0500
Branch: REL_12_STABLE [4641b2a30] 2021-01-25 13:03:11 -0500
Branch: REL_11_STABLE [a7cdd3f71] 2021-01-25 13:03:11 -0500
Branch: REL_10_STABLE [d09e8789f] 2021-01-25 13:03:11 -0500
Branch: REL9_6_STABLE [57a7d6f49] 2021-01-25 13:03:12 -0500
Branch: REL9_5_STABLE [41309f716] 2021-01-25 13:03:12 -0500
-->
     <para>
      Avoid assertion failure in <function>pg_get_functiondef()</function>
      when examining a function with a <literal>TRANSFORM</literal> option
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ea80d8d94] 2020-12-28 11:41:25 -0500
Branch: REL_13_STABLE [0ea25ed10] 2020-12-28 11:41:25 -0500
Branch: REL_12_STABLE [fd1347f9d] 2020-12-28 11:41:25 -0500
Branch: REL_11_STABLE [2e15f48d9] 2020-12-28 11:41:25 -0500
Branch: master [5f2e09bcc] 2020-12-28 11:55:23 -0500
Branch: REL_13_STABLE [63d78d106] 2020-12-28 11:55:32 -0500
Branch: REL_12_STABLE [d37965965] 2020-12-28 11:55:37 -0500
Branch: REL_11_STABLE [7966b41de] 2020-12-28 11:55:41 -0500
-->
     <para>
      Fix data structure misallocation in
      PL/pgSQL's <command>CALL</command> statement (Tom Lane)
     </para>

     <para>
      A <command>CALL</command> in a PL/pgSQL procedure, to another
      procedure that has OUT parameters, would fail if the called
      procedure did a <command>COMMIT</command>
      or <command>ROLLBACK</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ff6ce9a3a] 2020-12-28 15:43:44 -0500
Branch: REL_13_STABLE [06b844c2b] 2020-12-28 15:43:44 -0500
Branch: REL_12_STABLE [b3a5bf719] 2020-12-28 15:43:44 -0500
-->
     <para>
      In <application>libpq</application>, do not skip trying SSL after
      GSS encryption (Tom Lane)
     </para>

     <para>
      If we successfully made a GSS-encrypted connection, but then failed
      during authentication, we would fall back to an unencrypted
      connection rather than next trying an SSL-encrypted connection.
      This could lead to unexpected connection failure, or to silently
      getting an unencrypted connection where an encrypted one is
      expected.  Fortunately, GSS encryption could only succeed if both
      client and server hold valid tickets in the same Kerberos
      infrastructure.  It seems unlikely for that to be true in an
      environment that requires SSL encryption instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7e5e1bba0] 2020-11-29 15:22:04 -0500
Branch: REL_13_STABLE [72b930f50] 2020-11-29 15:22:04 -0500
Branch: REL_12_STABLE [3958abdad] 2020-11-29 15:22:04 -0500
Branch: REL_11_STABLE [777ac03a6] 2020-11-29 15:22:04 -0500
Branch: REL_10_STABLE [946277fd4] 2020-11-29 15:22:04 -0500
Branch: REL9_6_STABLE [3f59a05f0] 2020-11-29 15:22:04 -0500
Branch: REL9_5_STABLE [e2d5de150] 2020-11-29 15:22:04 -0500
-->
     <para>
      In <application>psql</application>, re-allow including a password
      in a <replaceable>connection_string</replaceable> argument of a
      <command>\connect</command> command (Tom Lane)
     </para>

     <para>
      This used to work, but a recent bug fix caused the password to be
      ignored (resulting in prompting for a password).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [314fb9bae] 2020-11-25 16:19:25 -0500
Branch: REL_13_STABLE [a0ef08172] 2020-11-25 16:19:25 -0500
Branch: REL_12_STABLE [ea7a167da] 2020-11-25 16:19:25 -0500
-->
     <para>
      In <application>psql</application>'s <command>\d</command> commands,
      don't truncate the display of column default values (Tom Lane)
     </para>

     <para>
      Formerly, they were arbitrarily truncated at 128 characters.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f76a85000] 2021-01-26 13:04:52 -0500
Branch: REL_13_STABLE [64bdb6e5f] 2021-01-26 13:04:52 -0500
Branch: REL_12_STABLE [82f97d33f] 2021-01-26 13:04:52 -0500
Branch: REL_11_STABLE [3fa7b9078] 2021-01-26 13:04:52 -0500
Branch: REL_10_STABLE [564cb2579] 2021-01-26 13:04:52 -0500
Branch: REL9_6_STABLE [2c2e134b7] 2021-01-26 13:04:52 -0500
Branch: REL9_5_STABLE [131825cd5] 2021-01-26 13:04:52 -0500
-->
     <para>
      Fix assorted bugs
      in <application>psql</application>'s <command>\help</command>
      command (Kyotaro Horiguchi, Tom Lane)
     </para>

     <para>
      <command>\help</command> with two argument words failed to find a
      command description using only the first word, for
      example <literal>\help reset all</literal> should show the help
      for <command>RESET</command> but did not.
      Also, <command>\help</command> often failed to invoke the pager when
      it should.  It also leaked memory.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [0bf83648a] 2021-02-03 11:27:13 +0100
Branch: REL_13_STABLE [1d3ce0223] 2021-02-03 11:43:01 +0100
Branch: REL_12_STABLE [1dd6baf78] 2021-02-03 11:58:15 +0100
-->
     <para>
      Fix <application>pg_dump</application>'s dumping of inherited
      generated columns (Peter Eisentraut)
     </para>

     <para>
      The previous behavior resulted in (harmless) errors during restore.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9eabfe300] 2021-01-12 13:37:38 -0500
Branch: REL_13_STABLE [0011c5a0f] 2021-01-12 13:37:38 -0500
Branch: REL_12_STABLE [436d9c5ca] 2021-01-12 13:37:38 -0500
Branch: REL_11_STABLE [9f15188a1] 2021-01-12 13:37:38 -0500
Branch: master [8e396a773] 2021-01-14 16:19:38 -0500
Branch: REL_13_STABLE [79d3ac72f] 2021-01-14 16:19:38 -0500
Branch: REL_12_STABLE [0d221ecec] 2021-01-14 16:19:38 -0500
Branch: REL_11_STABLE [bb12a7f42] 2021-01-14 16:19:38 -0500
Branch: REL_10_STABLE [1c9791f66] 2021-01-14 16:19:38 -0500
-->
     <para>
      In <application>pg_dump</application>, ensure that the restore
      script runs <command>ALTER PUBLICATION ADD TABLE</command> commands
      as the owner of the publication, and similarly runs <command>ALTER
      INDEX ATTACH PARTITION</command> commands as the owner of the
      partitioned index (Tom Lane)
     </para>

     <para>
      Previously, these commands would be run by the role that started the
      restore script; which will usually work, but in corner cases that
      role might not have adequate permissions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [f713ff7c6] 2021-01-16 12:21:35 -0800
Branch: REL_13_STABLE [b8daf894f] 2021-01-16 12:21:38 -0800
Branch: REL_12_STABLE [a0d31b1c9] 2021-01-16 12:21:39 -0800
Branch: REL_11_STABLE [c6ff165f9] 2021-01-16 12:21:39 -0800
Branch: REL_10_STABLE [b933c9c0b] 2021-01-16 12:21:39 -0800
Branch: REL9_6_STABLE [ad2b7c9bb] 2021-01-16 12:21:39 -0800
-->
     <para>
      Fix <application>pg_dump</application> to handle <literal>WITH
      GRANT OPTION</literal> in an extension's initial privileges
      (Noah Misch)
     </para>

     <para>
      If an extension's script creates an object and grants privileges
      on it with grant option, then later the user revokes such
      privileges, <application>pg_dump</application> would generate
      incorrect SQL for reproducing the situation.  (Few if any extensions
      do this today.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [2b4f31303] 2020-12-03 15:57:48 +0200
Branch: REL_13_STABLE [abd0abfb7] 2020-12-03 15:57:52 +0200
Branch: REL_12_STABLE [020f153db] 2020-12-03 15:57:54 +0200
Branch: REL_11_STABLE [63e316f0b] 2020-12-03 15:57:57 +0200
Branch: REL_10_STABLE [8b5c353ec] 2020-12-03 15:58:00 +0200
Branch: REL9_6_STABLE [0740857de] 2020-12-03 15:58:02 +0200
Branch: REL9_5_STABLE [81e3c868f] 2020-12-03 15:58:06 +0200
Branch: master [36a4ac20f] 2020-12-04 18:26:46 +0200
Branch: REL_13_STABLE [e41a2efbc] 2020-12-04 18:24:34 +0200
Branch: REL_12_STABLE [ad3fb04b9] 2020-12-04 18:24:57 +0200
Branch: REL_11_STABLE [cda50f211] 2020-12-04 18:25:12 +0200
Branch: REL_10_STABLE [45d363145] 2020-12-04 18:25:23 +0200
Branch: REL9_6_STABLE [a075c84f2] 2020-12-04 18:25:45 +0200
Branch: REL9_5_STABLE [1dd608bba] 2020-12-04 18:25:54 +0200
Branch: master [6ba581cf1] 2020-12-07 14:50:20 +0200
Branch: REL_13_STABLE [e6dc04d43] 2020-12-07 14:50:37 +0200
Branch: REL_12_STABLE [98f8cdd48] 2020-12-07 14:55:22 +0200
Branch: REL_11_STABLE [10d9c9d03] 2020-12-07 14:55:23 +0200
Branch: REL_10_STABLE [d137b14c3] 2020-12-07 14:55:25 +0200
Branch: REL9_6_STABLE [3ea8e660c] 2020-12-07 14:55:27 +0200
Branch: REL9_5_STABLE [beb6b45ab] 2020-12-07 14:55:28 +0200
-->
     <para>
      In <application>pg_rewind</application>, ensure that all WAL is
      accounted for when rewinding a standby server
      (Ian Barwick, Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c21ea4d53] 2021-01-13 14:52:59 -0500
Branch: REL_13_STABLE [6b045ca6c] 2021-01-13 14:52:49 -0500
Branch: REL_12_STABLE [3e214fafc] 2021-01-13 14:52:49 -0500
Branch: REL_11_STABLE [d8bb22ab3] 2021-01-13 14:52:49 -0500
-->
     <para>
      In <application>pgbench</application>, disallow a digit as the first
      character of a variable name (Fabien Coelho)
     </para>

     <para>
      This prevents trying to substitute variables into timestamp literal
      values, which may contain strings like <literal>12:34</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL_13_STABLE [f17e8f33f] 2021-01-26 16:42:13 -0300
Branch: REL_12_STABLE [fdf9d0054] 2021-01-26 16:42:13 -0300
Branch: REL_11_STABLE [fdd405c63] 2021-01-26 16:42:13 -0300
Branch: REL_10_STABLE [11a708f81] 2021-01-26 16:42:13 -0300
Branch: REL9_6_STABLE [bcae842b9] 2021-01-26 16:42:13 -0300
Branch: REL9_5_STABLE [f2dc96236] 2021-01-26 16:42:13 -0300
-->
     <para>
      Report the correct database name in connection failure error
      messages from some client programs (&Aacute;lvaro Herrera)
     </para>

     <para>
      If the database name was defaulted rather than given on the command
      line, <application>pg_dumpall</application>,
      <application>pgbench</application>, <application>oid2name</application>,
      and <application>vacuumlo</application> would produce misleading
      error messages after a connection failure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5c0f7cc54] 2021-02-02 13:49:08 -0500
Branch: REL_13_STABLE [586891394] 2021-02-02 13:49:08 -0500
Branch: REL_12_STABLE [742846958] 2021-02-02 13:49:08 -0500
Branch: REL_11_STABLE [5fc5ff61c] 2021-02-02 13:49:08 -0500
Branch: REL_10_STABLE [2671125c7] 2021-02-02 13:49:08 -0500
Branch: REL9_6_STABLE [608cf2bfd] 2021-02-02 13:49:08 -0500
Branch: REL9_5_STABLE [f0f9ed68d] 2021-02-02 13:49:08 -0500
-->
     <para>
      Fix memory leak in <filename>contrib/auto_explain</filename>
      (Japin Li)
     </para>

     <para>
      Memory consumed while producing the <literal>EXPLAIN</literal>
      output was not freed until the end of the current transaction (for a
      top-level statement) or the end of the surrounding statement (for a
      nested statement).  This was particularly a problem
      with <varname>log_nested_statements</varname> enabled.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [e3ebcca84] 2020-12-28 19:56:13 +0900
Branch: REL_13_STABLE [546f14374] 2020-12-28 19:57:51 +0900
Branch: REL_12_STABLE [e792ca4ac] 2020-12-28 19:59:00 +0900
Branch: REL_11_STABLE [294cdd7d0] 2020-12-28 19:59:40 +0900
Branch: REL_10_STABLE [744357d84] 2020-12-28 20:00:15 +0900
Branch: REL9_6_STABLE [03b7a1ee7] 2020-12-28 20:00:54 +0900
Branch: REL9_5_STABLE [b5c73eef8] 2020-12-28 20:01:31 +0900
-->
     <para>
      In <filename>contrib/postgres_fdw</filename>, avoid leaking open
      connections to remote servers when a user mapping or foreign server
      object is dropped (Bharath Rupireddy)
     </para>

     <para>
      Open connections that depend on a dropped user mapping or foreign
      server can no longer be referenced, but formerly they were kept
      around anyway for the duration of the local session.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [28d1601ad] 2020-12-08 15:22:12 +0900
Branch: REL_13_STABLE [dfd8bf2b9] 2020-12-08 15:22:38 +0900
Branch: REL_12_STABLE [d7ecba937] 2020-12-08 15:22:43 +0900
Branch: REL_11_STABLE [b88afd8b6] 2020-12-08 15:22:48 +0900
Branch: REL_10_STABLE [5ba1df0f1] 2020-12-08 15:22:53 +0900
Branch: REL9_6_STABLE [95992e5ed] 2020-12-08 15:22:59 +0900
Branch: REL9_5_STABLE [f95d9fd81] 2020-12-08 15:23:02 +0900
-->
     <para>
      In <filename>contrib/pgcrypto</filename>, check for error returns
      from OpenSSL's EVP functions (Michael Paquier)
     </para>

     <para>
      We do not really expect errors here, but this change silences
      warnings from static analysis tools.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ff769831e] 2020-12-22 13:23:49 -0500
Branch: REL_13_STABLE [4b0292253] 2020-12-22 13:23:49 -0500
Branch: REL_12_STABLE [f581e5383] 2020-12-22 13:23:49 -0500
Branch: REL_11_STABLE [a1bd14d54] 2020-12-22 13:23:49 -0500
-->
     <para>
      Make <filename>contrib/pg_prewarm</filename> more robust when the
      cluster is shut down before prewarming is complete (Tom Lane)
     </para>

     <para>
      Previously, autoprewarm would rewrite its status file with only the
      block numbers that it had managed to load so far, thus perhaps
      largely disabling the prewarm functionality in the next startup.
      Instead, suppress status file updates until the initial loading pass
      is complete.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [3836d4b64] 2020-11-12 14:34:37 +0000
Branch: REL_13_STABLE [48ab1fa30] 2020-11-12 14:59:06 +0000
Branch: REL_12_STABLE [7f69ed4ae] 2020-11-12 14:56:58 +0000
Branch: REL_11_STABLE [7e3dc147d] 2020-11-12 14:57:04 +0000
Branch: REL_10_STABLE [068de9dd4] 2020-11-12 14:57:08 +0000
Branch: REL9_6_STABLE [245a35f96] 2020-11-12 14:57:13 +0000
Branch: REL9_5_STABLE [4b212b7c8] 2020-11-12 14:55:51 +0000
-->
     <para>
      In <filename>contrib/pg_trgm</filename>'s GiST index support, avoid
      crash in the rare case that picksplit is called on exactly two index
      items (Andrew Gierth, Alexander Korotkov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ec29427ce] 2020-11-10 22:51:54 -0500
Branch: REL_13_STABLE [afce7908d] 2020-11-10 22:51:55 -0500
Branch: REL_12_STABLE [171c457cd] 2020-11-10 22:51:55 -0500
Branch: REL_11_STABLE [3a89ea0eb] 2020-11-10 22:51:56 -0500
Branch: REL_10_STABLE [e87139b43] 2020-11-10 22:51:57 -0500
Branch: REL9_6_STABLE [cd39c23a2] 2020-11-10 22:51:57 -0500
Branch: REL9_5_STABLE [210564a74] 2020-11-10 22:51:58 -0500
-->
     <para>
      Fix miscalculation of timeouts
      in <filename>contrib/pg_prewarm</filename>
      and <filename>contrib/postgres_fdw</filename>
      (Alexey Kondratov, Tom Lane)
     </para>

     <para>
      The main loop in <filename>contrib/pg_prewarm</filename>'s
      autoprewarm parent process underestimated its desired sleep time by
      a factor of 1000, causing it to consume much more CPU than intended.
      When waiting for a result from a remote
      server, <filename>contrib/postgres_fdw</filename> overestimated the
      desired timeout by a factor of 1000 (though this error had been
      mitigated by imposing a clamp to 60 seconds).
     </para>

     <para>
      Both of these errors stemmed from incorrectly converting
      seconds-and-microseconds to milliseconds.  Introduce a new
      API <function>TimestampDifferenceMilliseconds()</function>
      to make it easier to get this right in the future.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4823621db] 2021-01-15 11:28:51 -0500
Branch: REL_13_STABLE [f44ae4db5] 2021-01-15 11:29:05 -0500
Branch: REL_12_STABLE [f5d044eae] 2021-01-15 11:29:13 -0500
Branch: REL_11_STABLE [046c8face] 2021-01-15 11:29:18 -0500
Branch: REL_10_STABLE [5fa060c8f] 2021-01-15 11:29:26 -0500
Branch: REL9_6_STABLE [fc6d08b27] 2021-01-15 11:29:34 -0500
Branch: REL9_5_STABLE [3934543c2] 2021-01-15 11:29:43 -0500
Branch: master [9d23c15a0] 2021-01-20 12:07:23 -0500
Branch: REL_13_STABLE [6671e8194] 2021-01-20 12:07:31 -0500
Branch: REL_12_STABLE [561dd8d8a] 2021-01-20 12:07:35 -0500
Branch: REL_11_STABLE [cbcff1729] 2021-01-20 12:07:41 -0500
Branch: REL_10_STABLE [a3345383d] 2021-01-20 12:07:46 -0500
Branch: REL9_6_STABLE [cbcf7b130] 2021-01-20 12:07:52 -0500
Branch: REL9_5_STABLE [175f716a8] 2021-01-20 12:07:57 -0500
-->
     <para>
      Improve <application>configure</application>'s heuristics for
      selecting <varname>PG_SYSROOT</varname> on macOS (Tom Lane)
     </para>

     <para>
      The new method is more likely to produce desirable results when
      Xcode is newer than the underlying operating system.  Choosing
      a sysroot that does not match the OS version may result in
      nonfunctional executables.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [49407dc32] 2020-11-20 00:07:09 -0500
Branch: REL_13_STABLE [9e9a31bd0] 2020-11-20 00:58:26 -0500
Branch: REL_12_STABLE [5b8360427] 2020-11-20 00:58:26 -0500
Branch: REL_11_STABLE [d01e37845] 2020-11-20 00:58:26 -0500
Branch: REL_10_STABLE [153bf8d20] 2020-11-20 00:58:26 -0500
Branch: REL9_6_STABLE [e7abc1111] 2020-11-20 00:58:26 -0500
Branch: REL9_5_STABLE [2bb8c0f1d] 2020-11-20 00:58:26 -0500
-->
     <para>
      While building on macOS, specify <option>-isysroot</option> in
      link steps as well as compile steps (James Hilliard)
     </para>

     <para>
      This likewise improves the results when Xcode is out of sync with
      the operating system.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [9543f0861] 2020-12-07 19:34:13 -0800
Branch: REL_13_STABLE [4f64daf73] 2020-12-07 18:32:56 -0800
Branch: REL_12_STABLE [b07490b91] 2020-12-07 18:39:32 -0800
Branch: REL_11_STABLE [f4f924b3e] 2020-12-07 18:40:27 -0800
Branch: master [6c57f2ed1] 2020-11-09 20:01:33 -0800
Branch: REL_13_STABLE [6a192c77d] 2020-12-07 18:32:32 -0800
Branch: REL_12_STABLE [fa7a52fb9] 2020-12-07 18:39:32 -0800
Branch: REL_11_STABLE [90eb343ef] 2020-12-07 18:40:27 -0800
-->
     <para>
      Fix JIT compilation to be compatible with LLVM 11 and LLVM 12
      (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [5da871bfa] 2020-12-07 19:34:13 -0800
Branch: REL_13_STABLE [01c6370a3] 2020-12-07 18:33:03 -0800
Branch: REL_12_STABLE [27b57f806] 2020-12-07 18:39:32 -0800
Branch: REL_11_STABLE [1e16ad101] 2020-12-07 18:40:27 -0800
-->
     <para>
      Fix potential mishandling of references to boolean variables in
      JIT expression compilation (Andres Freund)
     </para>

     <para>
      No field reports attributable to this have been seen, but it seems
      likely that it could cause problems on some architectures.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ad84ecc98] 2020-11-16 15:16:39 -0500
Branch: REL_13_STABLE [53c7b4f62] 2020-11-16 15:16:39 -0500
Branch: REL_12_STABLE [029fa664e] 2020-11-16 15:16:39 -0500
Branch: REL_11_STABLE [89aa30a17] 2020-11-16 15:16:39 -0500
-->
     <para>
      Fix compile failure with ICU 68 and later (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [677f74e5b] 2020-12-01 11:46:56 -0300
Branch: REL_13_STABLE [5a1d1b954] 2020-12-01 11:46:56 -0300
Branch: REL_12_STABLE [f0ff52f25] 2020-12-01 11:46:56 -0300
Branch: REL_11_STABLE [49aaabdf8] 2020-12-01 11:46:56 -0300
-->
     <para>
      Avoid <function>memcpy()</function> with a NULL source pointer and
      zero count during partitioned index creation (&Aacute;lvaro Herrera)
     </para>

     <para>
      While such a call is not known to cause problems in itself, some
      compilers assume that the arguments of <function>memcpy()</function>
      are never NULL, which could result in incorrect optimization of
      nearby code.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c7edf4ac2] 2021-01-24 16:29:47 -0500
Branch: REL_13_STABLE [58a545344] 2021-01-24 16:29:47 -0500
Branch: REL_12_STABLE [5db6ba303] 2021-01-24 16:29:47 -0500
Branch: REL_11_STABLE [c82c015b5] 2021-01-24 16:29:47 -0500
Branch: REL_10_STABLE [728971d5f] 2021-01-24 16:29:48 -0500
Branch: REL9_6_STABLE [7e0786751] 2021-01-24 16:29:48 -0500
Branch: REL9_5_STABLE [c26a0865d] 2021-01-24 16:29:48 -0500
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2021a for DST law changes in Russia (Volgograd zone) and
      South Sudan, plus historical corrections for Australia, Bahamas,
      Belize, Bermuda, Ghana, Israel, Kenya, Nigeria, Palestine,
      Seychelles, and Vanuatu.
     </para>

     <para>
      Notably, the Australia/Currie zone has been corrected to the point
      where it is identical to Australia/Hobart.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-5">
  <title>Release 12.5</title>

  <formalpara>
  <title>Release date:</title>
  <para>2020-11-12</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.4.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.5</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.2,
    see <xref linkend="release-12-2"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [0c3185e96] 2020-11-09 07:32:09 -0800
Branch: REL_13_STABLE [c90c84b3f] 2020-11-09 07:32:12 -0800
Branch: REL_12_STABLE [ac8f6243c] 2020-11-09 07:32:12 -0800
Branch: REL_11_STABLE [43ebfea5a] 2020-11-09 07:32:13 -0800
Branch: REL_10_STABLE [f97ecea1e] 2020-11-09 07:32:13 -0800
Branch: REL9_6_STABLE [ff3de4c21] 2020-11-09 07:32:13 -0800
Branch: REL9_5_STABLE [aefc625de] 2020-11-09 07:32:14 -0800
-->
     <para>
      Block <command>DECLARE CURSOR ... WITH HOLD</command> and firing of
      deferred triggers within index expressions and materialized view
      queries (Noah Misch)
     </para>

     <para>
      This is essentially a leak in the <quote>security restricted
      operation</quote> sandbox mechanism.  An attacker having permission
      to create non-temporary SQL objects could parlay this leak to
      execute arbitrary SQL code as a superuser.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Etienne Stalmans for reporting this problem.
      (CVE-2020-25695)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a45bc8a4f] 2020-09-24 18:19:38 -0400
Branch: REL_13_STABLE [cb8885ac4] 2020-09-24 18:19:38 -0400
Branch: REL_12_STABLE [fb93f784f] 2020-09-24 18:19:38 -0400
Branch: REL_11_STABLE [1738a61c8] 2020-09-24 18:19:39 -0400
Branch: REL_10_STABLE [1888ff8d0] 2020-09-24 18:19:39 -0400
Branch: REL9_6_STABLE [7c154f2fd] 2020-09-24 18:19:39 -0400
Branch: REL9_5_STABLE [56b46d3a1] 2020-09-24 18:19:39 -0400
Branch: master [8e5793ab6] 2020-10-19 19:03:46 -0400
Branch: REL_13_STABLE [1814f915b] 2020-10-19 19:03:46 -0400
Branch: REL_12_STABLE [c6d0b9b16] 2020-10-19 19:03:46 -0400
Branch: REL_11_STABLE [5a9f99bed] 2020-10-19 19:03:47 -0400
Branch: REL_10_STABLE [68f236993] 2020-10-19 19:03:47 -0400
Branch: REL9_6_STABLE [5c78f7977] 2020-10-19 19:03:47 -0400
Branch: REL9_5_STABLE [da129a04a] 2020-10-19 19:03:47 -0400
-->
     <para>
      Fix usage of complex connection-string parameters
      in <application>pg_dump</application>,
      <application>pg_restore</application>,
      <application>clusterdb</application>,
      <application>reindexdb</application>,
      and <application>vacuumdb</application> (Tom Lane)
     </para>

     <para>
      The <option>-d</option> parameter
      of <application>pg_dump</application>
      and <application>pg_restore</application>, or
      the <option>--maintenance-db</option> parameter of the other
      programs mentioned, can be a <quote>connection string</quote>
      containing multiple connection parameters rather than just a
      database name.  In cases where these programs need to initiate
      additional connections, such as parallel processing or processing of
      multiple databases, the connection string was forgotten and just the
      basic connection parameters (database name, host, port, and
      username) were used for the additional connections.  This could lead
      to connection failures if the connection string included any other
      essential information, such as non-default SSL or GSS parameters.
      Worse, the connection might succeed but not be encrypted as
      intended, or be vulnerable to man-in-the-middle attacks that the
      intended connection parameters would have prevented.
      (CVE-2020-25694)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [85c54287a] 2020-10-21 16:19:00 -0400
Branch: REL_13_STABLE [2e4af4110] 2020-10-21 16:19:00 -0400
Branch: REL_12_STABLE [f656517ec] 2020-10-21 16:19:01 -0400
Branch: REL_11_STABLE [20be76d5c] 2020-10-21 16:19:01 -0400
Branch: REL_10_STABLE [8175da6e7] 2020-10-21 16:19:02 -0400
Branch: REL9_6_STABLE [870a23230] 2020-10-21 16:18:41 -0400
Branch: REL9_5_STABLE [6997da09a] 2020-10-21 16:18:41 -0400
-->
     <para>
      When <application>psql</application>'s <command>\connect</command>
      command re-uses connection parameters, ensure that all
      non-overridden parameters from a previous connection string are
      re-used (Tom Lane)
     </para>

     <para>
      This avoids cases where reconnection might fail due to omission of
      relevant parameters, such as non-default SSL or GSS options.
      Worse, the reconnection might succeed but not be encrypted as
      intended, or be vulnerable to man-in-the-middle attacks that the
      intended connection parameters would have prevented.
      This is largely the same problem as just cited
      for <application>pg_dump</application> et al,
      although <application>psql</application>'s behavior is more complex
      since the user may intentionally override some connection
      parameters.
      (CVE-2020-25694)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [098fb0079] 2020-11-09 07:32:09 -0800
Branch: REL_13_STABLE [67029845b] 2020-11-09 07:32:12 -0800
Branch: REL_12_STABLE [3855e5b47] 2020-11-09 07:32:13 -0800
Branch: REL_11_STABLE [7b356c78f] 2020-11-09 07:32:13 -0800
Branch: REL_10_STABLE [a498db87b] 2020-11-09 07:32:13 -0800
Branch: REL9_6_STABLE [12fd81cb7] 2020-11-09 07:32:14 -0800
Branch: REL9_5_STABLE [a54dfbee1] 2020-11-09 07:32:14 -0800
-->
     <para>
      Prevent <application>psql</application>'s <command>\gset</command>
      command from modifying specially-treated variables (Noah Misch)
     </para>

     <para>
      <command>\gset</command> without a prefix would overwrite whatever
      variables the server told it to.  Thus, a compromised server could
      set specially-treated variables such as <varname>PROMPT1</varname>,
      giving the ability to execute arbitrary shell code in the user's
      session.
     </para>

     <para>
      The <productname>PostgreSQL</productname> Project thanks
      Nick Cleaton for reporting this problem.
      (CVE-2020-25696)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [566372b3d] 2020-08-15 10:15:53 -0700
Branch: REL_13_STABLE Release: REL_13_0 [592a589a0] 2020-08-15 10:15:56 -0700
Branch: REL_12_STABLE [30e68a2ab] 2020-08-15 10:15:56 -0700
Branch: REL_11_STABLE [d4031d784] 2020-08-15 10:15:57 -0700
Branch: REL_10_STABLE [e525770dd] 2020-08-15 10:15:57 -0700
Branch: REL9_6_STABLE [5ae01df6f] 2020-08-15 10:15:57 -0700
Branch: REL9_5_STABLE [3fbbf64ce] 2020-08-15 10:15:57 -0700
Branch: REL_12_STABLE [06e50d8f7] 2020-08-15 16:15:59 -0700
Branch: REL_11_STABLE [6af0b12a5] 2020-08-15 16:16:15 -0700
Branch: REL_10_STABLE [e8e44e890] 2020-08-15 16:16:29 -0700
Branch: REL9_6_STABLE [85aa22cb1] 2020-08-15 16:16:34 -0700
Branch: REL9_5_STABLE [d8a22a387] 2020-08-15 16:16:42 -0700
-->
     <para>
      Prevent possible data loss from concurrent truncations of SLRU logs
      (Noah Misch)
     </para>

     <para>
      This rare problem would manifest in later <quote>apparent
      wraparound</quote> or <quote>could not access status of
      transaction</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [aca74843e] 2020-09-24 10:39:52 +1200
Branch: REL_13_STABLE [052014a20] 2020-09-24 10:27:22 +1200
Branch: REL_12_STABLE [7664cc869] 2020-09-24 10:30:47 +1200
Branch: REL_11_STABLE [c5a5bd0bb] 2020-09-24 10:31:57 +1200
Branch: REL_10_STABLE [dd36d6b00] 2020-09-24 10:33:00 +1200
Branch: REL9_6_STABLE [d38e15979] 2020-09-24 10:35:10 +1200
Branch: REL9_5_STABLE [23d8b3577] 2020-09-24 10:36:27 +1200
-->
     <para>
      Ensure that SLRU directories are properly fsync'd during checkpoints
      (Thomas Munro)
     </para>

     <para>
      This prevents possible data loss in a subsequent operating system
      crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d907bd054] 2020-11-03 15:41:32 -0500
Branch: REL_13_STABLE [768dbef0d] 2020-11-03 15:41:32 -0500
Branch: REL_12_STABLE [136f87ea5] 2020-11-03 15:41:32 -0500
Branch: REL_11_STABLE [501035a0a] 2020-11-03 15:41:32 -0500
Branch: REL_10_STABLE [df4405b78] 2020-11-03 15:41:32 -0500
Branch: REL9_6_STABLE [04c4b495b] 2020-11-03 15:41:32 -0500
Branch: REL9_5_STABLE [77df80cf6] 2020-11-03 15:41:32 -0500
-->
     <para>
      Fix <command>ALTER ROLE</command> for users with
      the <literal>BYPASSRLS</literal> attribute (Tom Lane, Stephen Frost)
     </para>

     <para>
      The <literal>BYPASSRLS</literal> attribute is only allowed to be
      changed by superusers, but other <command>ALTER ROLE</command>
      operations, such as password changes, should be allowed with only
      ordinary permission checks.  The previous coding erroneously
      restricted all changes on such a role to superusers.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [bbb927b4d] 2020-10-20 19:22:09 -0300
Branch: REL_13_STABLE [5f6463a20] 2020-10-20 19:22:09 -0300
Branch: REL_12_STABLE [0e6b6f8c7] 2020-10-20 19:22:09 -0300
Branch: REL_11_STABLE [a795f6782] 2020-10-20 19:22:09 -0300
-->
     <para>
      Ensure that <command>ALTER TABLE ONLY ... ENABLE/DISABLE
      TRIGGER</command> does not recurse to child tables
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      Previously the <literal>ONLY</literal> flag was ignored.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e5fac1cb1] 2020-09-16 13:38:26 -0400
Branch: REL_13_STABLE Release: REL_13_0 [17280b31c] 2020-09-16 13:38:26 -0400
Branch: REL_12_STABLE [511690ec5] 2020-09-16 13:38:26 -0400
-->
     <para>
      Avoid unnecessary recursion to partitions in <command>ALTER TABLE
      SET NOT NULL</command>, when the target column is already
      marked <literal>NOT NULL</literal> (Tom Lane)
     </para>

     <para>
      This avoids a potential deadlock in
      parallel <application>pg_restore</application>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [502898192] 2020-08-21 15:00:47 -0400
Branch: REL_13_STABLE Release: REL_13_0 [894f5dea7] 2020-08-21 15:00:48 -0400
Branch: REL_12_STABLE [d9253df12] 2020-08-21 15:00:43 -0400
Branch: REL_11_STABLE [373796524] 2020-08-21 15:00:43 -0400
Branch: REL_10_STABLE [e22e29c25] 2020-08-21 15:00:43 -0400
Branch: REL9_6_STABLE [37681d7e9] 2020-08-21 15:00:43 -0400
Branch: REL9_5_STABLE [21f8b1811] 2020-08-21 15:00:43 -0400
Branch: master [19f5a37b9] 2020-09-13 12:51:21 -0400
Branch: REL_13_STABLE Release: REL_13_0 [b380484a8] 2020-09-13 12:51:21 -0400
Branch: REL_12_STABLE [1371a1e41] 2020-09-13 12:51:21 -0400
Branch: REL_11_STABLE [f11210013] 2020-09-13 12:51:21 -0400
Branch: REL_10_STABLE [783a21eff] 2020-09-13 12:51:21 -0400
Branch: REL9_6_STABLE [1a9c93ec3] 2020-09-13 12:51:21 -0400
Branch: REL9_5_STABLE [86b8ef139] 2020-09-13 12:51:21 -0400
-->
     <para>
      Fix handling of expressions in <command>CREATE TABLE LIKE</command>
      with inheritance (Tom Lane)
     </para>

     <para>
      If a <command>CREATE TABLE</command> command uses
      both <literal>LIKE</literal> and traditional inheritance, column
      references in <literal>CHECK</literal> constraints and expression
      indexes that came from a <literal>LIKE</literal> parent table tended
      to get mis-numbered, resulting in wrong answers and/or bizarre error
      messages.  The same could happen in <literal>GENERATED</literal>
      expressions, in branches that have that feature.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [afc7e0ad5] 2020-09-01 13:40:43 -0400
Branch: REL_13_STABLE Release: REL_13_0 [15dad5776] 2020-09-01 13:40:43 -0400
Branch: REL_12_STABLE [7067ba1b4] 2020-09-01 13:40:43 -0400
Branch: REL_11_STABLE [f00f5e0c1] 2020-09-01 13:40:43 -0400
-->
     <para>
      Disallow <command>DROP INDEX CONCURRENTLY</command> on a partitioned
      table (&Aacute;lvaro Herrera, Michael Paquier)
     </para>

     <para>
      This case failed anyway, but with a confusing error message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5b7bfc397] 2020-11-05 11:44:32 -0500
Branch: REL_13_STABLE [44b973b91] 2020-11-05 11:44:32 -0500
Branch: REL_12_STABLE [0bdf1ef3d] 2020-11-05 11:44:32 -0500
Branch: REL_11_STABLE [7dc18c619] 2020-11-05 11:44:32 -0500
-->
     <para>
      Allow <command>LOCK TABLE</command> to succeed on a self-referential
      view (Tom Lane)
     </para>

     <para>
      It previously threw an error complaining about infinite recursion,
      but there seems no need to disallow the case.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [b17ff07aa] 2020-11-01 21:22:07 +0900
Branch: REL_13_STABLE [bb62df46b] 2020-11-01 21:24:10 +0900
Branch: REL_12_STABLE [41a033b50] 2020-11-01 21:24:15 +0900
-->
     <para>
      Retain statistics about an index across <command>REINDEX
      CONCURRENTLY</command> (Michael Paquier, Fabr&iacute;zio de Royes Mello)
     </para>

     <para>
      Non-concurrent reindexing has always preserved such statistics.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [e66bcfb4c] 2020-09-29 14:15:57 +0900
Branch: REL_13_STABLE [1aedaba78] 2020-09-29 14:16:12 +0900
Branch: REL_12_STABLE [8aa4496dd] 2020-09-29 14:16:18 +0900
-->
     <para>
      Fix incorrect progress reporting from <command>REINDEX
      CONCURRENTLY</command> (Matthias van de Meent, Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ad77039fa] 2020-10-28 13:47:02 -0400
Branch: REL_13_STABLE [70492195b] 2020-10-28 13:47:02 -0400
Branch: REL_12_STABLE [43330cdd4] 2020-10-28 13:47:02 -0400
-->
     <para>
      Ensure that <literal>GENERATED</literal> columns are updated when
      the column(s) they depend on are updated via a rule or an updatable
      view (Tom Lane)
     </para>

     <para>
      This fix also takes care of possible failure to fire a
      column-specific trigger in such cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [f481d2823] 2020-09-08 19:35:15 -0300
Branch: REL_13_STABLE Release: REL_13_0 [d0230a43f] 2020-09-08 19:35:15 -0300
Branch: REL_12_STABLE [ef1e1250e] 2020-09-08 19:35:15 -0300
-->
     <para>
      Recheck default partition constraints while routing an inserted or
      updated tuple to the correct partition (Amit Langote,
      &Aacute;lvaro Herrera)
     </para>

     <para>
      This fixes race conditions when partitions are added concurrently
      with the insertion.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [72647ac3b] 2020-09-28 14:12:38 -0400
Branch: REL_13_STABLE [61a78c71a] 2020-09-28 14:12:38 -0400
Branch: REL_12_STABLE [29f20db85] 2020-09-28 14:12:38 -0400
-->
     <para>
      Fix failures with collation-dependent partition bound expressions
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [560564d3a] 2020-11-04 12:46:28 +0100
Branch: REL_13_STABLE [82d4a2a7d] 2020-11-04 12:46:38 +0100
Branch: REL_12_STABLE [ea9087938] 2020-11-04 12:46:52 +0100
-->
     <para>
      Support hashing of text arrays (Peter Eisentraut)
     </para>

     <para>
      Array hashing failed if the array element type is collatable.
      Notably, this prevented using hash partitioning with a text array
      column as partition key.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [489c9c340] 2020-09-30 15:40:23 -0400
Branch: REL_13_STABLE [99fd38c02] 2020-09-30 15:40:23 -0400
Branch: REL_12_STABLE [c5232dca8] 2020-09-30 15:40:23 -0400
Branch: REL_11_STABLE [b0fe0b022] 2020-09-30 15:40:23 -0400
Branch: REL_10_STABLE [db96be24c] 2020-09-30 15:40:23 -0400
Branch: REL9_6_STABLE [19e798268] 2020-09-30 15:40:23 -0400
Branch: REL9_5_STABLE [4857e6fe1] 2020-09-30 15:40:23 -0400
-->
     <para>
      Fix off-by-one conversion of negative years to BC dates
      in <function>to_date()</function>
      and <function>to_timestamp()</function> (Dar Alathar-Yemen, Tom Lane)
     </para>

     <para>
      Also, arrange for the combination of a negative year and an
      explicit <quote>BC</quote> marker to cancel out and produce AD.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [fd26f7823] 2020-09-29 16:21:46 +0900
Branch: REL_13_STABLE [059caf36c] 2020-09-29 16:23:57 +0900
Branch: REL_12_STABLE [4d342b9d4] 2020-09-29 16:24:20 +0900
Branch: REL_11_STABLE [462ff7966] 2020-09-29 16:24:47 +0900
Branch: REL_10_STABLE [334417538] 2020-09-29 16:25:08 +0900
Branch: REL9_6_STABLE [7be02a3bf] 2020-09-29 16:25:20 +0900
Branch: REL9_5_STABLE [40a8fb1e0] 2020-09-29 16:25:51 +0900
-->
     <para>
      Ensure that standby servers will archive WAL timeline history files
      when <varname>archive_mode</varname> is set
      to <literal>always</literal> (Grigory Smolkin, Fujii Masao)
     </para>

     <para>
      This oversight could lead to failure of subsequent PITR recovery
      attempts.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3d65b0593] 2020-09-16 12:07:31 -0400
Branch: REL_13_STABLE Release: REL_13_0 [3e3f8f202] 2020-09-16 12:07:31 -0400
Branch: REL_12_STABLE [8580631ff] 2020-09-16 12:07:31 -0400
Branch: REL_11_STABLE [2c74f7139] 2020-09-16 12:07:31 -0400
Branch: REL_10_STABLE [d6d70f89a] 2020-09-16 12:07:31 -0400
-->
     <para>
      Fix <quote>cache lookup failed for relation 0</quote>
      failures in logical replication workers (Tom Lane)
     </para>

     <para>
      The real-world impact is small, since the failure is unlikely, and
      if it does happen the worker would just exit and be restarted.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c8746f999] 2020-09-04 20:33:36 -0400
Branch: REL_13_STABLE Release: REL_13_0 [9b81a30f9] 2020-09-04 20:33:37 -0400
Branch: REL_12_STABLE [9b47ee6e7] 2020-09-04 20:20:05 -0400
Branch: REL_11_STABLE [7156a0eac] 2020-09-04 20:20:05 -0400
Branch: REL_10_STABLE [9b8a8516e] 2020-09-04 20:20:06 -0400
-->
     <para>
      Prevent logical replication workers from sending redundant ping
      requests (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0038f9438] 2020-08-14 13:26:57 -0400
Branch: REL_13_STABLE Release: REL_13_0 [1c6066fbd] 2020-08-14 13:26:57 -0400
Branch: REL_12_STABLE [42566a250] 2020-08-14 13:26:57 -0400
Branch: REL_11_STABLE [250aaa2de] 2020-08-14 13:26:57 -0400
Branch: REL_10_STABLE [326b5fe0f] 2020-08-14 13:26:57 -0400
Branch: REL9_6_STABLE [b4d8be9f6] 2020-08-14 13:26:57 -0400
-->
     <para>
      During <quote>smart</quote> shutdown, don't terminate background
      processes until all client (foreground) sessions are done (Tom Lane)
     </para>

     <para>
      The previous behavior broke parallel query processing, since the
      postmaster would terminate parallel workers and refuse to launch any
      new ones.  It also caused autovacuum to cease functioning, which
      could have dire long-term effects if the surviving client sessions
      make a lot of data changes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_13_BR [9abb2bfc0] 2019-10-13 15:48:26 -0400
Branch: REL_12_STABLE [8b53dbada] 2020-10-15 12:50:57 -0400
Branch: REL_11_STABLE [85834023a] 2020-10-15 12:50:57 -0400
Branch: REL_10_STABLE [4e95733b0] 2020-10-15 12:50:57 -0400
Branch: REL9_6_STABLE [7753ca49d] 2020-10-15 12:50:57 -0400
-->
     <para>
      Avoid recursive consumption of stack space while processing signals
      in the postmaster (Tom Lane)
     </para>

     <para>
      Heavy use of parallel processing has been observed to cause
      postmaster crashes due to too many concurrent signals requesting
      creation of a parallel worker process.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bedadc732] 2020-09-09 15:32:45 -0400
Branch: REL_13_STABLE Release: REL_13_0 [35e59398a] 2020-09-09 15:32:34 -0400
Branch: REL_12_STABLE [d038c6c63] 2020-09-09 15:32:34 -0400
Branch: REL_11_STABLE [67dde49a3] 2020-09-09 15:32:34 -0400
Branch: REL_10_STABLE [95cd8902e] 2020-09-09 15:32:34 -0400
Branch: REL9_6_STABLE [b2eaddd9b] 2020-09-09 15:32:34 -0400
Branch: REL9_5_STABLE [581855b6a] 2020-09-09 15:32:34 -0400
Branch: master [58c6feccf] 2020-09-10 12:06:37 -0400
Branch: REL_13_STABLE Release: REL_13_0 [3f29aa48b] 2020-09-10 12:06:26 -0400
Branch: REL_12_STABLE [4e10c0c8a] 2020-09-10 12:06:26 -0400
Branch: REL_11_STABLE [93871b693] 2020-09-10 12:06:26 -0400
Branch: REL_10_STABLE [ac695b8f2] 2020-09-10 12:06:26 -0400
Branch: REL9_6_STABLE [dc71c6409] 2020-09-10 12:06:26 -0400
Branch: REL9_5_STABLE [e2c9bedc9] 2020-09-10 12:06:26 -0400
-->
     <para>
      Avoid running <systemitem>atexit</systemitem> handlers when exiting
      due to SIGQUIT (Kyotaro Horiguchi, Tom Lane)
     </para>

     <para>
      Most server processes followed this practice already, but the
      archiver process was overlooked.  Backends that were still waiting
      for a client startup packet got it wrong, too.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4d346def1] 2020-08-22 14:46:40 -0400
Branch: REL_13_STABLE Release: REL_13_0 [de627adaa] 2020-08-22 14:46:40 -0400
Branch: REL_12_STABLE [6b701eaaa] 2020-08-22 14:46:40 -0400
Branch: REL_11_STABLE [b439adcab] 2020-08-22 14:46:40 -0400
Branch: REL_10_STABLE [6fa403e61] 2020-08-22 14:46:40 -0400
Branch: REL9_6_STABLE [d3701bc8a] 2020-08-22 14:46:40 -0400
Branch: REL9_5_STABLE [7edd36eae] 2020-08-22 14:46:40 -0400
-->
     <para>
      Avoid misoptimization of subquery qualifications that reference
      apparently-constant grouping columns (Tom Lane)
     </para>

     <para>
      A <quote>constant</quote> subquery output column isn't really
      constant if it is a grouping column that appears in only some of the
      grouping sets.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d7885b1f8] 2020-10-06 11:43:53 -0400
Branch: REL_13_STABLE [b7f166efa] 2020-10-06 11:43:53 -0400
Branch: REL_12_STABLE [3d69efc4f] 2020-10-06 11:43:54 -0400
-->
     <para>
      Fix possible crash when considering partition-wise joins
      during GEQO planning (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1e7629d2c] 2020-08-14 22:14:03 -0400
Branch: REL_13_STABLE Release: REL_13_0 [b538e83f1] 2020-08-14 22:14:03 -0400
Branch: REL_12_STABLE [912fb290c] 2020-08-14 22:14:03 -0400
Branch: REL_11_STABLE [9d472b51e] 2020-08-14 22:14:03 -0400
Branch: REL_10_STABLE [dea07098a] 2020-08-14 22:14:03 -0400
Branch: REL9_6_STABLE [7241edc4f] 2020-08-14 22:14:03 -0400
Branch: REL9_5_STABLE [5190707d7] 2020-08-14 22:14:03 -0400
-->
     <para>
      Avoid failure when SQL function inlining changes the shape of a
      potentially-hashable subplan comparison expression (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [a811ea5bd] 2020-08-13 17:33:49 -0400
Branch: REL_13_STABLE Release: REL_13_0 [2f29fd4cb] 2020-08-13 17:33:49 -0400
Branch: REL_12_STABLE [1122a903e] 2020-08-13 17:33:49 -0400
Branch: REL_11_STABLE [704de3739] 2020-08-13 17:33:49 -0400
Branch: REL_10_STABLE [385cbe8e4] 2020-08-13 17:33:49 -0400
Branch: REL9_6_STABLE [e5902117d] 2020-08-13 17:33:49 -0400
Branch: REL9_5_STABLE [40bceae7b] 2020-08-13 17:33:49 -0400
Branch: master [6e70443ed] 2020-08-17 16:20:06 -0400
Branch: REL_13_STABLE Release: REL_13_0 [b83f1bcca] 2020-08-17 16:20:06 -0400
Branch: REL_12_STABLE [4f47c8e7d] 2020-08-17 16:20:06 -0400
Branch: REL_11_STABLE [060e5bd70] 2020-08-17 16:20:06 -0400
Branch: REL_10_STABLE [3a45ac076] 2020-08-17 16:20:05 -0400
Branch: REL9_6_STABLE [d4d214903] 2020-08-17 16:20:05 -0400
Branch: REL9_5_STABLE [aa4da2674] 2020-08-17 16:20:05 -0400
-->
     <para>
      While building or re-building an index, tolerate the appearance of
      new HOT chains due to concurrent updates
      (Anastasia Lubennikova, &Aacute;lvaro Herrera)
     </para>

     <para>
      This oversight could lead to <quote>failed to find parent tuple for
      heap-only tuple</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [b7f2dd959] 2020-09-17 16:11:48 +0530
Branch: REL_13_STABLE Release: REL_13_0 [0abd9cd2f] 2020-09-17 15:16:46 +0530
Branch: REL_12_STABLE [4bc63462d] 2020-09-17 15:38:47 +0530
Branch: REL_11_STABLE [956891fab] 2020-09-17 15:53:25 +0530
Branch: REL_10_STABLE [fcc3665a0] 2020-09-17 15:59:42 +0530
-->
     <para>
      Fix failure of parallel B-tree index scans when the index condition
      is unsatisfiable (James Hunter)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [7577dd848] 2020-11-07 00:39:19 +0100
Branch: REL_13_STABLE [6a7b55f37] 2020-11-07 00:40:06 +0100
Branch: REL_12_STABLE [8149e9f9a] 2020-11-07 00:40:40 +0100
Branch: REL_11_STABLE [895d0f0e8] 2020-11-07 00:41:02 +0100
Branch: REL_10_STABLE [0b96fc977] 2020-11-07 00:41:19 +0100
Branch: REL9_6_STABLE [bae31e75f] 2020-11-07 00:41:36 +0100
Branch: REL9_5_STABLE [d2d3a4bd3] 2020-11-07 00:41:52 +0100
-->
     <para>
      Ensure that data is detoasted before being inserted into a BRIN
      index (Tomas Vondra)
     </para>

     <para>
      Index entries are not supposed to contain out-of-line TOAST
      pointers, but BRIN didn't get that memo.  This could lead to errors
      like <quote>missing chunk number 0 for toast value NNN</quote>.
      (If you are faced with such an error from an existing
      index, <command>REINDEX</command> should be enough to fix it.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [1f42d35a1] 2020-08-12 15:33:36 -0400
Branch: REL_13_STABLE Release: REL_13_0 [8782ea2f3] 2020-08-12 15:33:36 -0400
Branch: REL_12_STABLE [0426c75e7] 2020-08-12 15:33:36 -0400
Branch: REL_11_STABLE [7af39993a] 2020-08-12 15:33:36 -0400
Branch: REL_10_STABLE [721ef4d28] 2020-08-12 15:33:36 -0400
Branch: REL9_6_STABLE [7a3c261fb] 2020-08-12 15:33:36 -0400
Branch: REL9_5_STABLE [ce3a8fde8] 2020-08-12 15:33:36 -0400
-->
     <para>
      Handle concurrent desummarization correctly during BRIN index scans
      (Alexander Lakhin, &Aacute;lvaro Herrera)
     </para>

     <para>
      Previously, if a page range was desummarized at just the wrong time,
      an index scan might falsely raise an error indicating index
      corruption.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [10564ee02] 2020-08-27 17:36:13 -0400
Branch: REL_13_STABLE Release: REL_13_0 [1df14a566] 2020-08-27 17:36:13 -0400
Branch: REL_12_STABLE [ff3c16d1e] 2020-08-27 17:36:13 -0400
Branch: REL_11_STABLE [11ecf4bd2] 2020-08-27 17:36:13 -0400
Branch: REL_10_STABLE [0d3ad6540] 2020-08-27 17:36:13 -0400
Branch: REL9_6_STABLE [0dfec43c8] 2020-08-27 17:36:13 -0400
Branch: REL9_5_STABLE [fabd2f9c9] 2020-08-27 17:36:13 -0400
-->
     <para>
      Fix rare <quote>lost saved point in index</quote> errors in scans of
      multicolumn GIN indexes (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [371668a83] 2020-10-12 18:01:34 -0400
Branch: REL_13_STABLE [962ab473e] 2020-10-12 18:01:34 -0400
Branch: REL_12_STABLE [12945874e] 2020-10-12 18:01:34 -0400
-->
     <para>
      Fix buffered GiST index builds to work when the index has included
      columns (Pavel Borisov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0a4b34031] 2020-11-02 21:11:50 -0500
Branch: REL_13_STABLE [a58a631b4] 2020-11-02 21:11:50 -0500
Branch: REL_12_STABLE [d3befe9b9] 2020-11-02 21:11:50 -0500
Branch: REL_11_STABLE [f28b089cb] 2020-11-02 21:11:50 -0500
Branch: REL_10_STABLE [7827497ba] 2020-11-02 21:11:50 -0500
-->
     <para>
      Fix unportable use of <function>getnameinfo()</function>
      in <structname>pg_hba_file_rules</structname> view (Tom Lane)
     </para>

     <para>
      On FreeBSD 11, and possibly other platforms, the
      view's <structfield>address</structfield>
      and <structfield>netmask</structfield> columns were always null due
      to this error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [f90e80b91] 2020-10-31 08:43:28 -0700
Branch: REL_13_STABLE [ab2e2ce46] 2020-10-31 08:43:32 -0700
Branch: REL_12_STABLE [741b84e9f] 2020-10-31 08:44:13 -0700
Branch: REL_11_STABLE [045466675] 2020-10-31 08:45:19 -0700
-->
     <para>
      Avoid crash if <varname>debug_query_string</varname> is NULL
      when starting a parallel worker (Noah Misch)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [ced138e8c] 2020-09-15 21:03:14 -0300
Branch: REL_13_STABLE Release: REL_13_0 [873cb8fca] 2020-09-15 21:03:14 -0300
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_12_STABLE [93f726c04] 2020-10-27 15:37:13 -0400
Branch: REL_11_STABLE [66c036b4f] 2020-10-27 15:37:13 -0400
Branch: REL_10_STABLE [41c742a43] 2020-10-27 15:37:13 -0400
Branch: REL9_6_STABLE [cc623ed2f] 2020-10-27 15:37:13 -0400
Branch: REL9_5_STABLE [7978ad025] 2020-10-27 15:37:13 -0400
-->
     <para>
      Fix use-after-free hazard when an event trigger monitors
      an <command>ALTER TABLE</command> operation (Jehan-Guillaume de
      Rorthais)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ba9f18abd] 2020-10-25 13:57:46 -0400
Branch: REL_13_STABLE [d88d8ad28] 2020-10-25 13:57:46 -0400
Branch: REL_12_STABLE [de78c1007] 2020-10-25 13:57:46 -0400
Branch: master [20d3fe900] 2020-10-26 11:36:53 -0400
Branch: master [8b39345a9] 2020-11-08 13:08:36 -0500
Branch: REL_13_STABLE [7aeb6404f] 2020-11-08 13:08:36 -0500
Branch: REL_12_STABLE [94ec005f3] 2020-11-08 13:08:36 -0500
-->
     <para>
      Avoid failures when a <literal>BEFORE ROW UPDATE</literal> trigger
      returns the <quote>old</quote> row of a table having dropped
      or <quote>missing</quote> columns (Amit Langote, Tom Lane)
     </para>

     <para>
      This method of suppressing an update could result in crashes,
      unexpected <literal>CHECK</literal> constraint failures, or
      incorrect <literal>RETURNING</literal> output,
      because <quote>missing</quote> columns would read as NULLs for those
      purposes.  (A column is <quote>missing</quote> for this purpose if
      it was added by <command>ALTER TABLE ADD COLUMN</command> with a
      non-NULL, but constant, default value.)  Dropped columns could cause
      trouble as well.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [19ad7e1d7] 2020-09-06 12:55:13 -0400
Branch: REL_13_STABLE Release: REL_13_0 [f04203ab7] 2020-09-06 12:55:28 -0400
Branch: REL_12_STABLE [f45dd3fed] 2020-09-06 12:55:37 -0400
Branch: REL_11_STABLE [baef6e5e9] 2020-09-06 12:55:44 -0400
Branch: REL_10_STABLE [f71b93b86] 2020-09-06 12:55:51 -0400
Branch: REL9_6_STABLE [2939f613f] 2020-09-06 12:55:59 -0400
Branch: REL9_5_STABLE [e0b4c7dd0] 2020-09-06 12:56:10 -0400
-->
     <para>
      Fix incorrect error message about inconsistent moving-aggregate
      data types (Jeff Janes)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [be4b0c007] 2020-09-03 16:52:09 -0400
Branch: REL_13_STABLE Release: REL_13_0 [17424e79d] 2020-09-03 16:52:09 -0400
Branch: REL_12_STABLE [82dd373f2] 2020-09-03 16:52:09 -0400
Branch: REL_11_STABLE [526df0a23] 2020-09-03 16:52:09 -0400
Branch: REL_10_STABLE [2a938c793] 2020-09-03 16:52:09 -0400
Branch: REL9_6_STABLE [2500e51e7] 2020-09-03 16:52:09 -0400
Branch: REL9_5_STABLE [3738651f5] 2020-09-03 16:52:09 -0400
-->
     <para>
      Avoid lockup when a parallel worker reports a very long error
      message (Vignesh C)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: REL_13_STABLE [1f53d0b9f] 2020-10-20 14:09:16 +0200
Branch: REL_12_STABLE [bd0677bb8] 2020-10-20 14:31:52 +0200
Branch: REL_11_STABLE [6e03a8a30] 2020-10-20 14:50:43 +0200
Branch: REL_10_STABLE [f78ebbe68] 2020-10-20 15:19:47 +0200
Branch: REL9_6_STABLE [d4e654d15] 2020-10-20 15:35:31 +0200
Branch: REL9_5_STABLE [d27c18d26] 2020-10-20 17:22:41 +0200
-->
     <para>
      Avoid unnecessary failure when transferring very large payloads
      through shared memory queues (Markus Wanner)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [72559438f] 2020-10-15 14:29:53 -0700
Branch: REL_13_STABLE [ae3e75aba] 2020-10-15 14:30:40 -0700
Branch: REL_12_STABLE [c8a2bb0f1] 2020-10-15 14:31:32 -0700
Branch: REL_11_STABLE [f3dee5b9a] 2020-10-15 15:06:16 -0700
Branch: master [fe2a16d8b] 2020-10-15 18:17:00 -0700
Branch: REL_13_STABLE [efc9a8e98] 2020-10-15 18:17:00 -0700
Branch: REL_12_STABLE [c835c7ffe] 2020-10-15 18:17:01 -0700
Branch: REL_11_STABLE [4a4f4487d] 2020-10-15 18:17:01 -0700
-->
     <para>
      Fix incorrect handling of template function attributes in JIT code
      generation (Andres Freund)
     </para>

     <para>
      This has been shown to cause crashes on <literal>s390x</literal>,
      and very possibly there are other cases on other platforms.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e55f718fc] 2020-09-26 16:04:06 -0400
Branch: REL_13_STABLE [f7873900f] 2020-09-26 16:04:06 -0400
Branch: REL_12_STABLE [bda32733c] 2020-09-26 16:04:06 -0400
Branch: REL_11_STABLE [dd89ba578] 2020-09-26 16:04:06 -0400
Branch: REL_10_STABLE [de6725deb] 2020-09-26 16:04:06 -0400
Branch: REL9_6_STABLE [acab757ce] 2020-09-26 16:04:06 -0400
Branch: REL9_5_STABLE [bf34ae930] 2020-09-26 16:04:06 -0400
-->
     <para>
      Fix relation cache memory leaks with RLS policies (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [623644f02] 2020-11-06 22:52:16 -0300
Branch: REL_13_STABLE [d94d37f8c] 2020-11-06 22:52:15 -0300
Branch: REL_12_STABLE [8ad6a0c1b] 2020-11-06 22:52:15 -0300
-->
     <para>
      Fix edge-case memory leak
      in <function>index_get_partition()</function> (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [397ea901e] 2020-10-12 13:31:24 -0400
Branch: REL_13_STABLE [9343bfefa] 2020-10-12 13:31:24 -0400
Branch: REL_12_STABLE [f35c11770] 2020-10-12 13:31:24 -0400
Branch: REL_11_STABLE [cfa4cff30] 2020-10-12 13:31:24 -0400
Branch: REL_10_STABLE [a5c77e6b8] 2020-10-12 13:31:24 -0400
Branch: REL9_6_STABLE [c7573ab1e] 2020-10-12 13:31:24 -0400
Branch: REL9_5_STABLE [43ca5e07d] 2020-10-12 13:31:24 -0400
-->
     <para>
      Fix small memory leak when SIGHUP processing decides that a new GUC
      variable value cannot be applied without a restart (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a6b1f5365] 2020-09-29 11:18:30 -0400
Branch: REL_13_STABLE [f0e4ec74e] 2020-09-29 11:18:30 -0400
Branch: REL_12_STABLE [c1e044bb3] 2020-09-29 11:18:31 -0400
Branch: REL_11_STABLE [13a1901ba] 2020-09-29 11:18:31 -0400
-->
     <para>
      Fix memory leaks
      in <application>PL/pgsql</application>'s <command>CALL</command>
      processing (Pavel Stehule, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b55b4dad9] 2020-09-01 13:14:44 -0400
Branch: REL_13_STABLE Release: REL_13_0 [4178b7499] 2020-09-01 13:14:44 -0400
Branch: REL_12_STABLE [55aea0c70] 2020-09-01 13:14:44 -0400
Branch: REL_11_STABLE [df8020b32] 2020-09-01 13:14:44 -0400
Branch: REL_10_STABLE [0c0a3a859] 2020-09-01 13:14:44 -0400
Branch: REL9_6_STABLE [ba23174dd] 2020-09-01 13:14:44 -0400
Branch: REL9_5_STABLE [8d486cfbf] 2020-09-01 13:14:44 -0400
Branch: master [4d41823c5] 2020-09-04 21:01:58 -0400
Branch: REL_13_STABLE Release: REL_13_0 [8df601bd4] 2020-09-04 21:01:59 -0400
Branch: REL_12_STABLE [fc37c6f61] 2020-09-04 21:01:59 -0400
Branch: REL_11_STABLE [d7ae549e3] 2020-09-04 21:01:59 -0400
Branch: REL_10_STABLE [546479f34] 2020-09-04 21:01:59 -0400
-->
     <para>
      Make <application>libpq</application> support arbitrary-length lines
      in <filename>.pgpass</filename> files (Tom Lane)
     </para>

     <para>
      This is mostly useful to allow using very long security tokens as
      passwords.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7d00a6b2d] 2020-10-17 16:53:48 -0400
Branch: REL_13_STABLE [d2074daeb] 2020-10-19 11:23:51 -0400
Branch: REL_12_STABLE [407580aab] 2020-10-19 11:23:51 -0400
Branch: REL_11_STABLE [883226441] 2020-10-19 11:23:52 -0400
Branch: REL_10_STABLE [6670e9107] 2020-10-19 11:23:52 -0400
Branch: REL9_6_STABLE [cdc7ace16] 2020-10-19 11:23:52 -0400
Branch: REL9_5_STABLE [6acc31a20] 2020-10-19 11:23:52 -0400
-->
     <para>
      In <application>libpq</application> for Windows,
      call <function>WSAStartup()</function> once per process
      and <function>WSACleanup()</function> not at all (Tom Lane,
      Alexander Lakhin)
     </para>

     <para>
      Previously, <application>libpq</application>
      invoked <function>WSAStartup()</function> at connection start
      and <function>WSACleanup()</function> at connection cleanup.
      However, it appears that calling <function>WSACleanup()</function>
      can interfere with other program operations; notably, we have
      observed rare failures to emit expected output to stdout.  There
      appear to be no ill effects from omitting the call, so do that.
      (This also eliminates a performance issue from repeated DLL loads and
      unloads when a program performs a series of database connections.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [21d36747d] 2020-10-24 13:12:08 -0400
Branch: REL_13_STABLE [fd048e0cb] 2020-10-24 13:12:19 -0400
Branch: REL_12_STABLE [bdc79ddd1] 2020-10-24 13:12:26 -0400
Branch: REL_11_STABLE [12a73f29f] 2020-10-24 13:12:31 -0400
Branch: REL_10_STABLE [f38b66ec0] 2020-10-24 13:12:41 -0400
Branch: REL9_6_STABLE [379c43bda] 2020-10-24 13:12:47 -0400
Branch: REL9_5_STABLE [758b45e83] 2020-10-24 13:12:53 -0400
-->
     <para>
      Fix <application>ecpg</application> library's per-thread
      initialization logic for Windows (Tom Lane, Alexander Lakhin)
     </para>

     <para>
      Multi-threaded <application>ecpg</application> applications could
      suffer rare misbehavior due to incorrect locking.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [66f8687a8] 2020-10-28 14:35:53 -0400
Branch: REL_13_STABLE [ba4f5413e] 2020-10-28 14:35:53 -0400
Branch: REL_12_STABLE [cb0982ba9] 2020-10-28 14:35:53 -0400
Branch: REL_11_STABLE [9eb250339] 2020-10-28 14:35:53 -0400
Branch: REL_10_STABLE [504f963f7] 2020-10-28 14:35:53 -0400
Branch: REL9_6_STABLE [204d77969] 2020-10-28 14:35:53 -0400
Branch: REL9_5_STABLE [aff06436c] 2020-10-28 14:35:53 -0400
-->
     <para>
      On Windows, make <application>psql</application> read the output of
      a backtick command in text mode, not binary mode (Tom Lane)
     </para>

     <para>
      This ensures proper handling of newlines.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [3eb3d3e78] 2020-09-04 13:54:54 -0400
Branch: REL_13_STABLE Release: REL_13_0 [72857482c] 2020-09-04 13:55:11 -0400
Branch: REL_12_STABLE [616110eac] 2020-09-04 13:55:03 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9e5f1f21a] 2020-10-07 12:51:02 -0400
Branch: REL_13_STABLE [2ea624b4b] 2020-10-07 12:51:03 -0400
Branch: REL_12_STABLE [d8c2a2199] 2020-10-07 12:51:04 -0400
Branch: REL_11_STABLE [f2c6e94f0] 2020-10-07 12:51:05 -0400
Branch: REL_10_STABLE [0c79dcb36] 2020-10-07 12:51:05 -0400
Branch: REL9_6_STABLE [710c0a66d] 2020-10-07 12:51:06 -0400
Branch: REL9_5_STABLE [0bfe356c5] 2020-10-07 12:51:06 -0400
-->
     <para>
      Ensure that <application>pg_dump</application> collects per-column
      information about extension configuration tables (Fabr&iacute;zio de
      Royes Mello, Tom Lane)
     </para>

     <para>
      Failure to do this led to crashes when
      specifying <option>--inserts</option>, or underspecified (though
      usually correct) <command>COPY</command> commands when
      using <command>COPY</command> to reload the tables' data.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [2ba5b2db7] 2020-08-14 17:33:31 -0400
Branch: REL_13_STABLE Release: REL_13_0 [b7cc21c57] 2020-08-14 17:33:31 -0400
Branch: REL_12_STABLE [3dadcb2b3] 2020-08-14 17:33:31 -0400
-->
     <para>
      Ensure that parallel <application>pg_restore</application> processes
      foreign keys referencing partitioned tables in the correct order
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      Previously, it might try to restore a foreign key constraint before
      the required indexes were all in place, leading to an error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [3c0471b5f] 2020-10-15 19:33:46 -0400
Branch: REL_13_STABLE [59cfff65b] 2020-10-15 19:33:45 -0400
Branch: REL_12_STABLE [a106236d8] 2020-10-15 19:33:43 -0400
Branch: REL_11_STABLE [eb421c83b] 2020-10-15 19:33:42 -0400
Branch: REL_10_STABLE [85fedf39f] 2020-10-15 19:33:36 -0400
Branch: REL9_6_STABLE [39c23c199] 2020-10-15 19:33:36 -0400
Branch: REL9_5_STABLE [d9ae2297b] 2020-10-15 19:33:36 -0400
Branch: master [536de14e2] 2020-10-15 20:37:20 -0400
Branch: REL_13_STABLE [79fe23465] 2020-10-15 20:37:20 -0400
Branch: REL_12_STABLE [0ab7ca98a] 2020-10-15 20:37:20 -0400
Branch: REL_11_STABLE [16be4e435] 2020-10-15 20:37:19 -0400
Branch: REL_10_STABLE [6e34cc8ab] 2020-10-15 20:37:19 -0400
Branch: REL9_6_STABLE [9dcffe69a] 2020-10-15 20:37:19 -0400
Branch: REL9_5_STABLE [b05672c72] 2020-10-15 20:37:19 -0400
-->
     <para>
      Make <application>pg_upgrade</application> check for pre-existence
      of tablespace directories in the target cluster (Bruce Momjian)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [ca2a12c93] 2020-10-19 09:36:56 +0900
Branch: REL_13_STABLE [1bd9b2b23] 2020-10-19 09:37:50 +0900
Branch: REL_12_STABLE [57bdf29dd] 2020-10-19 09:37:55 +0900
Branch: REL_11_STABLE [914139081] 2020-10-19 09:38:01 +0900
Branch: REL_10_STABLE [e8d36f9ec] 2020-10-19 09:38:06 +0900
Branch: REL9_6_STABLE [994a02f7f] 2020-10-19 09:38:13 +0900
Branch: REL9_5_STABLE [099238322] 2020-10-19 09:38:18 +0900
-->
     <para>
      Fix potential memory leak in <filename>contrib/pgcrypto</filename>
      (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [02a75f836] 2020-10-16 11:59:13 -0400
Branch: REL_13_STABLE [3d338a46a] 2020-10-16 11:59:25 -0400
Branch: REL_12_STABLE [7004ce758] 2020-10-16 11:59:31 -0400
Branch: REL_11_STABLE [1eb2d7e3e] 2020-10-16 11:59:36 -0400
Branch: REL_10_STABLE [3e1a4c260] 2020-10-16 11:59:41 -0400
Branch: REL9_6_STABLE [e15115b4d] 2020-10-16 11:59:47 -0400
Branch: REL9_5_STABLE [9c3032881] 2020-10-16 11:59:52 -0400
-->
     <para>
      Add check for an unlikely failure case
      in <filename>contrib/pgcrypto</filename> (Daniel Gustafsson)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4a071afbd] 2020-10-29 15:28:14 -0400
Branch: REL_13_STABLE [ee03baad2] 2020-10-29 15:28:28 -0400
Branch: REL_12_STABLE [25b587f03] 2020-10-29 15:28:35 -0400
Branch: REL_11_STABLE [24d769b90] 2020-10-29 15:28:41 -0400
Branch: REL_10_STABLE [c39f4e81d] 2020-10-29 15:28:47 -0400
-->
     <para>
      Fix recently-added <type>timetz</type> test case so it works when
      the USA is not observing daylight savings time (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c4a803ac7] 2020-10-16 21:53:33 -0400
Branch: REL_13_STABLE [3f26dca76] 2020-10-16 21:53:43 -0400
Branch: REL_12_STABLE [b39c94097] 2020-10-16 21:53:50 -0400
Branch: REL_11_STABLE [2b9166dbc] 2020-10-16 21:53:55 -0400
Branch: REL_10_STABLE [aae4097b0] 2020-10-16 21:54:03 -0400
Branch: REL9_6_STABLE [13dbf4ab8] 2020-10-16 21:54:09 -0400
Branch: REL9_5_STABLE [c8cb243cb] 2020-10-16 21:54:14 -0400
Branch: master [7d6d6bce4] 2020-10-22 21:23:47 -0400
Branch: REL_13_STABLE [96ed2ae93] 2020-10-22 21:24:01 -0400
Branch: REL_12_STABLE [78ccf7f42] 2020-10-22 21:24:07 -0400
Branch: REL_11_STABLE [02f86d523] 2020-10-22 21:24:12 -0400
Branch: REL_10_STABLE [a357cc05d] 2020-10-22 21:24:17 -0400
Branch: REL9_6_STABLE [05a36321a] 2020-10-22 21:24:23 -0400
Branch: REL9_5_STABLE [0abebb58f] 2020-10-22 21:24:28 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2020d for DST law changes in Fiji, Morocco, Palestine, the
      Canadian Yukon, Macquarie Island, and Casey Station (Antarctica);
      plus historical corrections for France, Hungary, Monaco, and
      Palestine.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ce0e97f80] 2020-10-16 21:40:16 -0400
Branch: REL_13_STABLE [e0cf5e9b2] 2020-10-16 21:40:16 -0400
Branch: REL_12_STABLE [3d13a8307] 2020-10-16 21:40:16 -0400
Branch: REL_11_STABLE [4a2528bfa] 2020-10-16 21:40:16 -0400
Branch: REL_10_STABLE [41eeeb348] 2020-10-16 21:40:16 -0400
Branch: REL9_6_STABLE [5515c73a6] 2020-10-16 21:40:16 -0400
Branch: REL9_5_STABLE [38fac9c1f] 2020-10-16 21:40:16 -0400
Branch: master [c5054da0d] 2020-10-22 21:15:22 -0400
Branch: REL_13_STABLE [0e551533b] 2020-10-22 21:15:37 -0400
Branch: REL_12_STABLE [f56c42e50] 2020-10-22 21:16:04 -0400
Branch: REL_11_STABLE [d2ffe0a00] 2020-10-22 21:16:16 -0400
Branch: REL_10_STABLE [34285083b] 2020-10-22 21:16:23 -0400
Branch: REL9_6_STABLE [58f9f52a3] 2020-10-22 21:16:31 -0400
Branch: REL9_5_STABLE [ff26f804a] 2020-10-22 21:16:38 -0400
-->
     <para>
      Sync our copy of the timezone library with IANA tzcode release 2020d
      (Tom Lane)
     </para>

     <para>
      This absorbs upstream's change of <application>zic</application>'s
      default output option from <quote>fat</quote>
      to <quote>slim</quote>.  That's just cosmetic for our purposes, as
      we continue to select the <quote>fat</quote> mode in pre-v13
      branches.  This change also ensures
      that <function>strftime()</function> does not
      change <varname>errno</varname> unless it fails.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-4">
  <title>Release 12.4</title>

  <formalpara>
  <title>Release date:</title>
  <para>2020-08-13</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.3.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.4</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.2,
    see <xref linkend="release-12-2"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [11da97024] 2020-08-10 09:22:54 -0700
Branch: REL_13_STABLE [412c5c401] 2020-08-10 09:22:58 -0700
Branch: REL_12_STABLE [64a71062e] 2020-08-10 09:22:58 -0700
Branch: REL_11_STABLE [5a936d64c] 2020-08-10 09:22:59 -0700
Branch: REL_10_STABLE [dd5d99516] 2020-08-10 09:22:59 -0700
Branch: master [cec57b1a0] 2020-08-10 09:22:54 -0700
Branch: REL_13_STABLE [b601f24c8] 2020-08-10 09:22:58 -0700
Branch: REL_12_STABLE [515ee4a7e] 2020-08-10 09:22:58 -0700
Branch: REL_11_STABLE [613ed8a58] 2020-08-10 09:22:59 -0700
Branch: REL_10_STABLE [b793d6af9] 2020-08-10 09:22:59 -0700
-->
     <para>
      Set a secure <varname>search_path</varname> in logical replication
      walsenders and apply workers (Noah Misch)
     </para>

     <para>
      A malicious user of either the publisher or subscriber database
      could potentially cause execution of arbitrary SQL code by the role
      running replication, which is often a superuser.  Some of the risks
      here are equivalent to those described in CVE-2018-1058, and are
      mitigated in this patch by ensuring that the replication sender and
      receiver execute with empty <varname>search_path</varname> settings.
      (As with CVE-2018-1058, that change might cause problems for
      under-qualified names used in replicated tables' DDL.)  Other risks
      are inherent in replicating objects that belong to untrusted roles;
      the most we can do is document that there is a hazard to consider.
      (CVE-2020-14349)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7eeb1d986] 2020-08-10 10:44:42 -0400
Branch: REL_13_STABLE [98ca64899] 2020-08-10 10:44:42 -0400
Branch: REL_12_STABLE [3ba967084] 2020-08-10 10:44:42 -0400
Branch: REL_11_STABLE [afa358786] 2020-08-10 10:44:43 -0400
Branch: REL_10_STABLE [96cbfe92d] 2020-08-10 10:44:43 -0400
Branch: REL9_6_STABLE [2ea8a60fc] 2020-08-10 10:44:43 -0400
Branch: REL9_5_STABLE [6b11a4687] 2020-08-10 10:44:43 -0400
-->
     <para>
      Make contrib modules' installation scripts more secure (Tom Lane)
     </para>

     <para>
      Attacks similar to those described in CVE-2018-1058 could be carried
      out against an extension installation script, if the attacker can
      create objects in either the extension's target schema or the schema
      of some prerequisite extension.  Since extensions often require
      superuser privilege to install, this can open a path to obtaining
      superuser privilege.  To mitigate this risk, be more careful about
      the <varname>search_path</varname> used to run an installation
      script; disable <varname>check_function_bodies</varname> within the
      script; and fix catalog-adjustment queries used in some contrib
      modules to ensure they are secure.  Also provide documentation to
      help third-party extension authors make their installation scripts
      secure.  This is not a complete solution; extensions that depend on
      other extensions can still be at risk if installed carelessly.
      (CVE-2020-14350)
     </para>
    </listitem>

    <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
Branch: master [13838740f] 2020-07-28 11:00:00 +0900
Branch: REL_13_STABLE [cebe10a5f] 2020-07-28 11:00:00 +0900
Branch: REL_12_STABLE [62c4a7729] 2020-07-28 11:00:02 +0900
Branch: REL_11_STABLE [bead29dec] 2020-07-28 11:00:03 +0900
Branch: master [199cec977] 2020-08-07 14:45:00 +0900
Branch: REL_13_STABLE [79a3ab1e9] 2020-08-07 14:45:01 +0900
Branch: REL_12_STABLE [4f2693229] 2020-08-07 14:45:02 +0900
Branch: REL_11_STABLE [1db9c80f8] 2020-08-07 14:45:04 +0900
-->
     <para>
      Fix edge cases in partition pruning (Etsuro Fujita, Dmitry Dolgov)
     </para>

     <para>
      When there are multiple partition key columns, generation of pruning
      tests could misbehave if some columns had no
      constraining <literal>WHERE</literal> clauses or multiple
      constraining clauses.  This could lead to server crashes, incorrect
      query results, or assertion failures.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [689696c71] 2020-07-14 18:56:56 -0400
Branch: REL_13_STABLE [e38705b5c] 2020-07-14 18:56:49 -0400
Branch: REL_12_STABLE [de797e823] 2020-07-14 18:56:49 -0400
Branch: REL_11_STABLE [e9f031172] 2020-07-14 18:56:49 -0400
-->
     <para>
      Fix construction of parameterized BitmapAnd and BitmapOr index scans
      on the inside of partition-wise nestloop joins (Tom Lane)
     </para>

     <para>
      A plan in which such a scan needed to use a value from the outside
      of the join would usually crash at execution.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7a980dfc6] 2020-08-05 15:38:55 -0400
Branch: REL_13_STABLE [c43a36fa8] 2020-08-05 15:38:55 -0400
Branch: REL_12_STABLE [f992da210] 2020-08-05 15:38:55 -0400
-->
     <para>
      Fix incorrect plan execution when a partitioned table is subject to
      both static and run-time partition pruning in the same query, and a
      new partition is added concurrently with the query (Amit Langote,
      Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [470687b4a] 2020-08-08 12:31:55 -0400
Branch: REL_13_STABLE [900429d0c] 2020-08-08 12:31:55 -0400
Branch: REL_12_STABLE [85cb4ec50] 2020-08-08 12:31:55 -0400
Branch: REL_11_STABLE [1fa6eec97] 2020-08-08 12:31:55 -0400
Branch: REL_10_STABLE [d81387da9] 2020-08-08 12:31:55 -0400
Branch: REL9_6_STABLE [55d42c917] 2020-08-08 12:31:55 -0400
Branch: REL9_5_STABLE [ca8e87ea0] 2020-08-08 12:31:55 -0400
-->
     <para>
      In logical replication walsender, fix failure to send feedback
      messages after sending a keepalive message (&Aacute;lvaro Herrera)
     </para>

     <para>
      This is a relatively minor problem when using built-in logical
      replication, because the built-in walreceiver will send a feedback
      reply (which clears the incorrect state) fairly frequently anyway.
      But with some other replication systems, such
      as <application>pglogical</application>, it causes significant
      performance issues.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d5daae47d] 2020-07-20 13:40:16 -0400
Branch: REL_13_STABLE [2f1f189cf] 2020-07-20 13:40:16 -0400
Branch: REL_12_STABLE [71e561bd4] 2020-07-20 13:40:16 -0400
Branch: REL_11_STABLE [e8de627a3] 2020-07-20 13:40:16 -0400
Branch: REL_10_STABLE [39d6aec19] 2020-07-20 13:40:16 -0400
-->
     <para>
      Fix firing of column-specific <literal>UPDATE</literal> triggers in
      logical replication subscribers (Tom Lane)
     </para>

     <para>
      The code neglected to account for the possibility of column numbers
      being different between the publisher and subscriber tables, so that
      if those were indeed different, wrong decisions might be made about
      which triggers to fire.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [b48df818d] 2020-06-18 16:34:59 +0900
Branch: REL_13_STABLE [43e70addf] 2020-06-18 16:35:29 +0900
Branch: REL_12_STABLE [16f43122d] 2020-06-18 16:35:32 +0900
Branch: REL_11_STABLE [1657e14b5] 2020-06-18 16:35:36 +0900
-->
     <para>
      Update oldest xmin and LSN values
      during <function>pg_replication_slot_advance()</function> (Michael
      Paquier)
     </para>

     <para>
      This function previously failed to do that, possibly preventing
      resource cleanup (such as removal of no-longer-needed WAL segments)
      after manual advancement of a replication slot.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [78e73e875] 2020-07-31 11:43:12 -0400
Branch: REL_13_STABLE [11dce63d6] 2020-07-31 11:43:12 -0400
Branch: REL_12_STABLE [70248d8f5] 2020-07-31 11:43:12 -0400
Branch: REL_11_STABLE [da596fb4b] 2020-07-31 11:43:12 -0400
Branch: REL_10_STABLE [5e724125a] 2020-07-31 11:43:12 -0400
Branch: REL9_6_STABLE [8ab00b9fe] 2020-07-31 11:43:13 -0400
-->
     <para>
      Fix slow execution of <function>ts_headline()</function> (Tom Lane)
     </para>

     <para>
      The phrase-search fix added in our previous set of minor releases
      could cause <function>ts_headline()</function> to take unreasonable
      amounts of time for long documents; to make matters worse, the query
      was not cancellable within the troublesome loop.
     </para>
    </listitem>

    <listitem>
<!--
Author: Joe Conway <mail@joeconway.com>
Branch: master Release: REL_13_BR [887cdff4d] 2020-05-28 13:19:00 -0400
Branch: REL_12_STABLE [3ccae5445] 2020-05-28 13:19:10 -0400
Branch: REL_11_STABLE [36758c472] 2020-05-28 13:19:16 -0400
Branch: REL_10_STABLE [2cbe3a954] 2020-05-28 13:17:11 -0400
Branch: REL9_6_STABLE [28e2c6eac] 2020-05-28 13:17:20 -0400
Branch: REL9_5_STABLE [bfb9595a7] 2020-05-28 13:17:28 -0400
-->
     <para>
      Ensure the <function>repeat()</function> function can be interrupted
      by query cancel (Joe Conway)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [183926da3] 2020-07-09 16:02:23 -0400
Branch: REL_13_STABLE [601d419b2] 2020-07-09 16:02:23 -0400
Branch: REL_12_STABLE [2564e2d08] 2020-07-09 16:02:23 -0400
Branch: REL_11_STABLE [90b418f81] 2020-07-09 16:02:23 -0400
Branch: REL_10_STABLE [765ad260a] 2020-07-09 16:02:23 -0400
-->
     <para>
      Fix <function>pg_current_logfile()</function> to not include a
      carriage return (<literal>\r</literal>) in its result on Windows
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Joe Conway <mail@joeconway.com>
Branch: master [96d1f423f] 2020-07-04 06:26:53 -0400
Branch: REL_13_STABLE [0025c3a2c] 2020-07-04 06:28:21 -0400
Branch: REL_12_STABLE [015e899a7] 2020-07-04 06:28:44 -0400
Branch: REL_11_STABLE [c2cdaf0cb] 2020-07-04 06:29:03 -0400
Branch: master [1d05627fc] 2020-07-04 13:46:31 -0400
Branch: REL_13_STABLE [c536da177] 2020-07-04 13:47:07 -0400
Branch: REL_12_STABLE [b615b2365] 2020-07-04 13:47:21 -0400
Branch: REL_11_STABLE [1243aa9b2] 2020-07-04 13:47:31 -0400
-->
     <para>
      Ensure that <function>pg_read_file()</function> and related
      functions read until EOF is reached (Joe Conway)
     </para>

     <para>
      Previously, if not given a specific data length to read, these
      functions would stop at whatever file length was reported
      by <function>stat()</function>.  That's unhelpful for pipes and
      other sorts of virtual files.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [df646509f] 2020-07-11 03:21:00 +0300
Branch: REL_13_STABLE [89a0b1a7c] 2020-07-11 03:21:48 +0300
Branch: REL_12_STABLE [f4ae676e3] 2020-07-11 03:21:57 +0300
-->
     <para>
      Forbid numeric <literal>NaN</literal> values in <type>jsonpath</type>
      computations (Alexander Korotkov)
     </para>

     <para>
      Neither SQL nor JSON have the concept of <literal>NaN</literal>
      (not-a-number), but the <type>jsonpath</type> code attempted to
      allow such values anyway.  This necessarily leads to nonstandard
      behavior, so it seems better to reject such values at the outset.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [03109a530] 2020-06-13 13:43:40 -0400
Branch: REL_13_STABLE [33dd9bb3b] 2020-06-13 13:43:40 -0400
Branch: REL_12_STABLE [874372a94] 2020-06-13 13:43:24 -0400
-->
     <para>
      Handle single <literal>Inf</literal> or <literal>NaN</literal>
      inputs correctly in floating-point aggregates (Tom Lane)
     </para>

     <para>
      The affected aggregates are
      <function>corr()</function>,
      <function>covar_pop()</function>,
      <function>regr_intercept()</function>,
      <function>regr_r2()</function>,
      <function>regr_slope()</function>,
      <function>regr_sxx()</function>,
      <function>regr_sxy()</function>,
      <function>regr_syy()</function>,
      <function>stddev_pop()</function>, and
      <function>var_pop()</function>.
      The correct answer in such cases is <literal>NaN</literal>, but an
      algorithmic change introduced in <productname>PostgreSQL</productname>
      v12 had caused these aggregates to produce zero instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [77a3be32f] 2020-06-11 17:38:42 -0400
Branch: REL_13_STABLE [ee788ba99] 2020-06-11 17:38:42 -0400
Branch: REL_12_STABLE [4284e1184] 2020-06-11 17:38:42 -0400
Branch: REL_11_STABLE [49e0a42dd] 2020-06-11 17:38:42 -0400
Branch: REL_10_STABLE [411a4626e] 2020-06-11 17:38:42 -0400
Branch: REL9_6_STABLE [36df06e25] 2020-06-11 17:38:42 -0400
-->
     <para>
      Fix mis-handling of <literal>NaN</literal> inputs during parallel
      aggregation on <type>numeric</type>-type columns (Tom Lane)
     </para>

     <para>
      If some partial aggregation workers found only <literal>NaN</literal>s
      while others found only non-<literal>NaN</literal>s, the results
      were combined incorrectly, possibly leading to the wrong overall
      result (i.e., not <literal>NaN</literal> when it should be).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_13_BR [a9632830b] 2020-06-04 16:42:23 -0400
Branch: REL_12_STABLE [a958b07bc] 2020-06-04 16:42:08 -0400
Branch: REL_11_STABLE [6490376e5] 2020-06-04 16:42:08 -0400
Branch: REL_10_STABLE [b2c64f571] 2020-06-04 16:42:08 -0400
Branch: REL_10_STABLE [9a9ba4c4d] 2020-06-04 17:57:19 -0400
-->
     <para>
      Reject time-of-day values greater than 24 hours (Tom Lane)
     </para>

     <para>
      The intention of the datetime input code is to
      allow <quote>24:00:00</quote> or
      equivalently <quote>23:59:60</quote>, but no larger value.
      However, the range check was miscoded so that it would
      accept <quote>23:59:60.<replaceable>nnn</replaceable></quote> with
      nonzero fractional-second <replaceable>nnn</replaceable>.  In
      timestamp values this would result in wrapping into the first second
      of the next day.  In <type>time</type> and <type>timetz</type>
      values, the stored value would actually be more than 24 hours,
      causing dump/reload failures and possibly other misbehavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [63d2ac23b] 2020-06-22 11:46:41 -0400
Branch: REL_13_STABLE [57f8b9913] 2020-06-22 11:46:41 -0400
Branch: REL_12_STABLE [d3d875518] 2020-06-22 11:46:41 -0400
Branch: REL_11_STABLE [35a8e227e] 2020-06-22 11:46:41 -0400
Branch: REL_10_STABLE [6d9f7a094] 2020-06-22 11:46:41 -0400
Branch: REL9_6_STABLE [bd53ea2b2] 2020-06-22 11:46:41 -0400
Branch: REL9_5_STABLE [dda25c599] 2020-06-22 11:46:41 -0400
-->
     <para>
      Undo double-quoting of index names in <command>EXPLAIN</command>'s
      non-text output formats (Tom Lane, Euler Taveira)
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [2a2494229] 2020-07-25 10:20:39 +0530
Branch: REL_13_STABLE [b15367ae3] 2020-07-25 10:31:19 +0530
Branch: REL_12_STABLE [bdaa84e38] 2020-07-25 10:38:46 +0530
Branch: REL_11_STABLE [603c18b7e] 2020-07-25 10:48:09 +0530
Branch: REL_10_STABLE [f963b5bc0] 2020-07-25 10:57:20 +0530
-->
     <para>
      Fix <command>EXPLAIN</command>'s accounting for resource usage,
      particularly buffer accesses, in parallel workers in a plan
      using <literal>Gather Merge</literal> nodes
      (Jehan-Guillaume de Rorthais)
     </para>
    </listitem>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [f1fcf2d3b] 2020-07-14 16:55:35 +1200
Branch: REL_13_STABLE [b82730429] 2020-07-14 16:57:41 +1200
Branch: REL_12_STABLE [1231a0b0e] 2020-07-14 17:03:12 +1200
Branch: REL_11_STABLE [d2761b680] 2020-07-14 16:59:57 +1200
Branch: REL_10_STABLE [4e02f88a4] 2020-07-14 17:00:28 +1200
Branch: REL9_6_STABLE [c732df133] 2020-07-14 17:00:57 +1200
Branch: REL9_5_STABLE [e20003fa0] 2020-07-14 17:01:25 +1200
-->
     <para>
      Fix timing of constraint revalidation in <command>ALTER
      TABLE</command> (David Rowley)
     </para>

     <para>
      If <command>ALTER TABLE</command> needs to fully rewrite the table's
      contents (for example, due to change of a column's data type) and
      also needs to scan the table to re-validate foreign keys
      or <literal>CHECK</literal> constraints, it sometimes did things in
      the wrong order, leading to odd errors such as <quote>could not read
      block 0 in file "base/nnnnn/nnnnn": read only 0 of 8192 bytes</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [1127f0e39] 2020-06-05 10:26:02 +0900
Branch: REL_12_STABLE [75f147924] 2020-06-05 10:29:27 +0900
-->
     <para>
      Fix <command>REINDEX CONCURRENTLY</command> to preserve the index's
      replication identity flag (Michael Paquier)
     </para>

     <para>
      Previously, reindexing a table's replica identity index caused the
      setting to be lost, preventing old tuple values from being included
      in future logical-decoding output.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL_12_STABLE [798b4faef] 2020-07-20 15:54:24 -0400
Branch: REL_11_STABLE [855195a7b] 2020-07-20 15:54:24 -0400
Branch: REL_12_STABLE [b7103bbe3] 2020-07-21 11:40:46 -0400
Branch: REL_11_STABLE [99b0c5da3] 2020-07-21 11:40:47 -0400
Branch: REL_10_STABLE [ae3d40b0c] 2020-07-21 11:40:47 -0400
-->
     <para>
      Work around incorrect not-null markings for
      <structname>pg_subscription</structname>.<structfield>subslotname</structfield>
      and <structname>pg_subscription_rel</structname>.<structfield>srsublsn</structfield>
      (Tom Lane)
     </para>

     <para>
      The bootstrap catalog data incorrectly marks these two catalog
      columns as always non-null.  There's no easy way to correct that
      mistake in existing installations (though v13 and later will have
      the correct markings).  The main place that depends on that marking
      being correct is JIT-enabled tuple deconstruction, so teach it to
      explicitly ignore the marking for these two columns.  Also adjust
      some C code that accessed <structfield>srsublsn</structfield> without
      checking to see if it's null; a crash from that is improbable but
      perhaps not impossible.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a742ecf9c] 2020-07-13 20:38:20 -0400
Branch: REL_13_STABLE [0734dbc45] 2020-07-13 20:38:20 -0400
Branch: REL_12_STABLE [d3b642ad9] 2020-07-13 20:38:21 -0400
Branch: REL_11_STABLE [3753df8f8] 2020-07-13 20:38:21 -0400
Branch: REL_10_STABLE [6443cd2e2] 2020-07-13 20:38:21 -0400
Branch: REL9_6_STABLE [dc6bb0994] 2020-07-13 20:38:21 -0400
Branch: REL9_5_STABLE [80d8f6d1d] 2020-07-13 20:38:21 -0400
-->
     <para>
      Cope with <literal>LATERAL</literal> references in restriction
      clauses attached to an un-flattened sub-<literal>SELECT</literal> in
      the <literal>FROM</literal> clause (Tom Lane)
     </para>

     <para>
      This oversight could result in assertion failures or crashes at
      query execution.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_13_BR [044c99bc5] 2020-06-05 16:18:50 -0400
Branch: REL_12_STABLE [022cd0bfd] 2020-06-05 16:18:50 -0400
Branch: master [bd0d893aa] 2020-07-21 19:41:03 -0400
Branch: REL_13_STABLE [cc4dd2a7a] 2020-07-21 19:40:44 -0400
Branch: REL_12_STABLE [171633ff5] 2020-07-21 19:40:44 -0400
-->
     <para>
      Use the query-specified collation for operators invoked during
      selectivity estimation (Tom Lane)
     </para>

     <para>
      Previously, the collation of the underlying database column was
      used.  But using the query's collation is arguably more correct.
      More importantly, now that we have nondeterministic collations,
      there are cases where an operator will fail outright if given a
      nondeterministic collation.  We don't want planning to fail in cases
      where the query itself would work, so this means that we must use
      the query's collation when invoking operators for estimation
      purposes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ca5e93f76] 2020-07-03 19:01:21 -0400
Branch: REL_13_STABLE [9233624b1] 2020-07-03 19:01:21 -0400
Branch: REL_12_STABLE [153c14cdd] 2020-07-03 19:01:21 -0400
Branch: REL_11_STABLE [ef799bdd0] 2020-07-03 19:01:21 -0400
Branch: REL_10_STABLE [5144a40f3] 2020-07-03 19:01:22 -0400
Branch: REL9_6_STABLE [69a3fe6e6] 2020-07-03 19:01:22 -0400
Branch: REL9_5_STABLE [d83d59e42] 2020-07-03 19:01:22 -0400
-->
     <para>
      Avoid believing that a never-analyzed foreign table has zero tuples
      (Tom Lane)
     </para>

     <para>
      This primarily affected the planner's estimate of the number of
      groups that would be obtained by <literal>GROUP BY</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [986529ce4] 2020-07-09 20:13:25 -0400
Branch: REL_13_STABLE [c3a79e719] 2020-07-09 20:13:25 -0400
Branch: REL_12_STABLE [ca5001a36] 2020-07-09 20:13:25 -0400
Branch: REL_11_STABLE [907283576] 2020-07-09 20:13:25 -0400
Branch: REL_10_STABLE [40316dfed] 2020-07-09 20:13:24 -0400
-->
     <para>
      Remove bogus warning about <quote>leftover placeholder tuple</quote>
      in BRIN index de-summarization (&Aacute;lvaro Herrera)
     </para>

     <para>
      The case can occur legitimately after a cancelled vacuum, so warning
      about it is overly noisy.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f7b5988cc] 2020-07-03 17:01:34 -0400
Branch: REL_13_STABLE [cfe89f5e6] 2020-07-03 17:01:34 -0400
Branch: REL_12_STABLE [8b83e0160] 2020-07-03 17:01:34 -0400
Branch: REL_11_STABLE [79ed1d99d] 2020-07-03 17:01:34 -0400
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [ecd9e9f0b] 2020-07-03 15:09:06 +0200
Branch: REL_13_STABLE [1d94c3965] 2020-07-03 15:10:12 +0200
Branch: REL_12_STABLE [28a862e9d] 2020-07-03 15:10:33 +0200
Branch: REL_11_STABLE [4aa02d072] 2020-07-03 15:10:41 +0200
-->
     <para>
      Fix selection of tablespaces for <quote>shared fileset</quote>
      temporary files (Magnus Hagander, Tom Lane)
     </para>

     <para>
      If <varname>temp_tablespaces</varname> is empty or explicitly names
      the database's primary tablespace, such files got placed into
      the <literal>pg_default</literal> tablespace rather than the
      database's primary tablespace as expected.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [a44dd932f] 2020-06-20 17:34:51 +0300
Branch: REL_13_STABLE [39aafc88c] 2020-06-20 18:14:51 +0300
Branch: REL_12_STABLE [396a44a01] 2020-06-20 17:35:55 +0300
Branch: REL_11_STABLE [3f88e2d78] 2020-06-20 17:35:59 +0300
-->
     <para>
      Fix corner-case error in masking of SP-GiST index pages during WAL
      consistency checking (Alexander Korotkov)
     </para>

     <para>
      This could cause false failure reports
      when <varname>wal_consistency_checking</varname> is enabled.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [7897e3bb9] 2020-06-16 16:59:07 +1200
Branch: REL_13_STABLE [3e0b08c40] 2020-06-16 17:00:06 +1200
Branch: REL_12_STABLE [28ee12669] 2020-06-16 17:00:21 +1200
Branch: REL_11_STABLE [9c14d6024] 2020-06-16 17:00:37 +1200
Branch: REL_10_STABLE [95647a1c7] 2020-06-16 17:00:53 +1200
Branch: REL9_6_STABLE [02b71f06b] 2020-06-16 17:01:07 +1200
Branch: REL9_5_STABLE [89020a92f] 2020-06-16 17:01:22 +1200
Branch: master [42dee8b8e] 2020-07-23 21:10:49 +1200
Branch: REL_13_STABLE [6b366190d] 2020-07-23 21:15:01 +1200
Branch: REL_12_STABLE [8bf4e69a7] 2020-07-23 21:17:47 +1200
Branch: REL_11_STABLE [028f0c3a8] 2020-07-23 21:18:02 +1200
Branch: REL_10_STABLE [fac4145bf] 2020-07-23 21:18:13 +1200
Branch: REL9_6_STABLE [47adb2488] 2020-07-23 21:18:25 +1200
Branch: REL9_5_STABLE [3725c8ce4] 2020-07-23 21:18:34 +1200
-->
     <para>
      Improve error handling in the server's <filename>buffile</filename>
      module (Thomas Munro)
     </para>

     <para>
      Fix some cases where I/O errors were indistinguishable from reaching
      EOF, or were not reported at all.  Also add details such as block
      numbers and byte counts where appropriate.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [5940ffb22] 2020-06-11 10:09:47 -0700
Branch: REL_13_STABLE [6df7105e5] 2020-06-11 10:09:45 -0700
Branch: REL_12_STABLE [e620a38c2] 2020-06-11 10:09:43 -0700
Branch: REL_11_STABLE [dd616f2ec] 2020-06-11 10:09:40 -0700
Branch: REL_10_STABLE [19a6e1bc3] 2020-06-11 10:09:37 -0700
Branch: REL9_6_STABLE [e81dc2b7e] 2020-06-11 10:09:35 -0700
Branch: REL9_5_STABLE [c05f6b354] 2020-06-11 10:09:32 -0700
-->
     <para>
      Fix conflict-checking anomalies in <literal>SERIALIZABLE</literal>
      isolation mode (Peter Geoghegan)
     </para>

     <para>
      If a concurrently-inserted tuple was updated by a different
      concurrent transaction, and neither tuple version was visible to the
      current transaction's snapshot, serialization conflict checking
      could draw the wrong conclusions about whether the tuple was relevant
      to the results of the current transaction.  This could allow a
      serializable transaction to commit when it should have failed with a
      serialization error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master Release: REL_13_BR [242dfcbaf] 2020-05-15 16:50:34 -0400
Branch: REL_12_STABLE [1d84751c6] 2020-05-15 16:50:34 -0400
Branch: REL_11_STABLE [37b5c5fde] 2020-05-15 16:50:34 -0400
Branch: REL_10_STABLE [09f2752b0] 2020-05-15 16:50:34 -0400
Branch: REL9_6_STABLE [4649eb919] 2020-05-15 16:50:34 -0400
Branch: REL9_5_STABLE [0a319699d] 2020-05-15 16:50:34 -0400
-->
     <para>
      Avoid repeated marking of dead btree index entries as dead (Masahiko
      Sawada)
     </para>

     <para>
      While functionally harmless, this led to useless WAL traffic when
      checksums are enabled or <varname>wal_log_hints</varname> is on.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master Release: REL_13_BR [e8abf585a] 2020-05-14 08:39:26 +0300
Branch: REL_12_STABLE [891a2007e] 2020-05-14 08:40:19 +0300
-->
     <para>
      Fix checkpointer process to discard file sync requests
      when <varname>fsync</varname> is off (Heikki Linnakangas)
     </para>

     <para>
      Such requests are treated as no-ops if <varname>fsync</varname> is
      off, but we forgot to remove them from the checkpointer's table of
      pending actions.  This would lead to bloat of that table, as well as
      possible assertion failures if <varname>fsync</varname> is later
      re-enabled.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master Release: REL_13_BR [303640199] 2019-12-19 09:06:54 -0500
Branch: REL_12_STABLE [bcbc27251] 2020-08-06 13:58:23 -0400
Branch: REL_11_STABLE [f7013683d] 2020-08-06 14:06:24 -0400
Branch: master Release: REL_13_BR [f05798014] 2020-04-26 13:48:33 +0200
Branch: REL_12_STABLE [7c78040f6] 2020-08-06 14:55:00 -0400
Branch: REL_11_STABLE [495a9b1fb] 2020-08-06 15:01:55 -0400
-->
     <para>
      Avoid trouble during cleanup of a non-exclusive backup when JIT
      compilation has been activated during the backup (Robert Haas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [57cb80630] 2020-06-08 13:57:24 +1200
Branch: REL_13_STABLE [acefa2cca] 2020-06-08 13:58:10 +1200
Branch: REL_12_STABLE [72766ad63] 2020-06-08 13:58:35 +1200
Branch: REL_11_STABLE [48eb6a3c8] 2020-06-08 13:59:57 +1200
Branch: REL_10_STABLE [fd11b842e] 2020-06-08 14:01:07 +1200
Branch: REL9_6_STABLE [644cac32a] 2020-06-08 14:01:51 +1200
Branch: REL9_5_STABLE [09dc17486] 2020-06-08 14:02:20 +1200
-->
     <para>
      Fix failure of some code paths to acquire the correct lock before
      modifying <filename>pg_control</filename> (Nathan Bossart, Fujii
      Masao)
     </para>

     <para>
      This oversight could allow <filename>pg_control</filename> to be
      written out with an inconsistent checksum, possibly causing trouble
      later, including inability to restart the database if it crashed
      before the next <filename>pg_control</filename> update.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [ce1c5b9ae] 2020-06-01 14:41:18 +0900
Branch: REL_12_STABLE [894041eb2] 2020-06-01 14:41:25 +0900
Branch: REL_11_STABLE [8bc74490d] 2020-06-01 14:41:32 +0900
Branch: REL_10_STABLE [a36f21620] 2020-06-01 14:41:37 +0900
Branch: REL9_6_STABLE [e2fa9732f] 2020-06-01 14:41:42 +0900
Branch: REL9_5_STABLE [a8c6eb5b4] 2020-06-01 14:41:46 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [e786be5fc] 2020-06-01 10:32:06 +0900
Branch: REL_12_STABLE [95e389b3c] 2020-06-01 10:32:53 +0900
-->
     <para>
      Fix errors in <function>currtid()</function>
      and <function>currtid2()</function> (Michael Paquier)
     </para>

     <para>
      These functions (which are undocumented and used only by ancient
      versions of the ODBC driver) contained coding errors that could
      result in crashes, or in confusing error messages such as <quote>could
      not open file</quote> when applied to a relation having no storage.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [c1669fd58] 2020-06-04 10:17:49 +0900
Branch: REL_12_STABLE [03aa25b6e] 2020-06-04 10:18:02 +0900
Branch: REL_11_STABLE [b41a85f53] 2020-06-04 10:18:06 +0900
Branch: REL_10_STABLE [5ed8b4a98] 2020-06-04 10:18:11 +0900
Branch: REL9_6_STABLE [e7a134b58] 2020-06-04 10:18:17 +0900
Branch: REL9_5_STABLE [4a9809e34] 2020-06-04 10:18:27 +0900
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_13_BR [f88bd3139] 2020-06-03 12:36:23 -0400
Branch: REL_12_STABLE [3d474a079] 2020-06-03 12:36:24 -0400
Branch: REL_11_STABLE [7a8cb4a61] 2020-06-03 12:36:00 -0400
Branch: REL_10_STABLE [0c735c686] 2020-06-03 12:36:00 -0400
-->
     <para>
      Avoid calling <function>elog()</function>
      or <function>palloc()</function> while holding a spinlock (Michael
      Paquier, Tom Lane)
     </para>

     <para>
      Logic associated with replication slots had several violations of
      this coding rule.  While the odds of trouble are quite low, an error
      in the called function would lead to a stuck spinlock.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [7ccb2f54d] 2020-05-16 18:15:18 +0900
Branch: REL_12_STABLE [b4ded2f22] 2020-05-16 18:16:31 +0900
Branch: REL_11_STABLE [70ae82b9b] 2020-05-16 18:16:37 +0900
Branch: REL_10_STABLE [3acb30b49] 2020-05-16 18:16:41 +0900
-->
     <para>
      Fix assertion in logical replication subscriber to allow use
      of <literal>REPLICA IDENTITY FULL</literal> (Euler Taveira)
     </para>

     <para>
      This was just an incorrect assertion, so it has no impact on
      standard production builds.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL_13_BR [7247e243a] 2020-06-07 13:44:13 -0400
Branch: REL_12_STABLE [2edf14f5a] 2020-06-07 13:44:13 -0400
-->
     <para>
      Ensure that <application>libpq</application> continues to try to
      read from the database connection socket after a write failure
      (Tom Lane)
     </para>

     <para>
      This is important not only to ensure that we collect any final error
      message from a dying server process, but because we do not consider
      the connection lost until we see a read failure.  This oversight
      allowed <application>libpq</application> to continue trying to
      send <command>COPY</command> data indefinitely after a mid-transfer
      loss of connection, rather than reporting failure to the application.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [25fe5ac45] 2020-07-13 11:58:08 -0400
Branch: REL_13_STABLE [8e6f134a9] 2020-07-13 11:58:09 -0400
Branch: REL_12_STABLE [e8b22a8a2] 2020-07-13 11:57:55 -0400
-->
     <para>
      Fix bugs in <application>libpq</application>'s management of GSS
      encryption state (Tom Lane)
     </para>

     <para>
      A connection using GSS encryption could freeze up when attempting to
      reset it after a server restart, or when moving on to the next one of
      a list of candidate servers.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [e576f71fb] 2020-06-30 18:34:41 +0200
Branch: REL_13_STABLE [70dc45e8c] 2020-06-30 19:35:22 +0200
Branch: REL_12_STABLE [6425d6f6a] 2020-06-30 18:35:21 +0200
-->
     <para>
      Fix <application>ecpg</application> crash with <type>bytea</type>
      and cursor variables (Jehan-Guillaume de Rorthais)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [ae3259c55] 2020-06-19 16:46:07 -0400
Branch: REL_13_STABLE [e74559c97] 2020-06-19 16:46:07 -0400
Branch: REL_12_STABLE [5b52008a6] 2020-06-19 16:46:07 -0400
Branch: REL_11_STABLE [2e155d90d] 2020-06-19 16:46:07 -0400
Branch: REL_10_STABLE [411febd53] 2020-06-19 16:46:07 -0400
Branch: REL9_6_STABLE [83762d0a9] 2020-06-19 16:46:07 -0400
Branch: REL9_5_STABLE [bbbce94dc] 2020-06-19 16:46:06 -0400
-->
     <para>
      Report out-of-disk-space errors properly
      in <application>pg_dump</application>
      and <application>pg_basebackup</application> (Justin Pryzby, Tom
      Lane, &Aacute;lvaro Herrera)
     </para>

     <para>
      Some code paths could produce silly reports like <quote>could not
      write file: Success</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f009591d6] 2020-07-17 13:04:05 -0400
Branch: REL_13_STABLE [71e8e66f7] 2020-07-17 13:04:06 -0400
Branch: REL_12_STABLE [66232220e] 2020-07-17 13:03:50 -0400
Branch: master [a8d0732ac] 2020-07-17 13:04:05 -0400
Branch: REL_13_STABLE [447cf2f8e] 2020-07-17 13:04:06 -0400
Branch: REL_12_STABLE [39a068ce6] 2020-07-17 12:14:28 -0400
-->
     <para>
      Make <application>pg_restore</application> cope with
      data-offset-less custom-format archive files when it needs to
      restore data items out of order (David Gilman, Tom Lane)
     </para>

     <para>
      <application>pg_dump</application> will produce such files if it
      cannot seek its output (for example, if the output is piped to
      something).  This fix primarily improves the ability to do a
      parallel restore from such a file.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ea9125304] 2020-07-11 13:36:50 -0400
Branch: REL_13_STABLE [bc9aaac1a] 2020-07-11 13:36:50 -0400
Branch: REL_12_STABLE [5fea14f4b] 2020-07-11 13:36:50 -0400
Branch: REL_11_STABLE [4fdc559c8] 2020-07-11 13:36:50 -0400
Branch: REL_10_STABLE [2d43c3057] 2020-07-11 13:36:51 -0400
Branch: REL9_6_STABLE [303322c5a] 2020-07-11 13:36:51 -0400
Branch: REL9_5_STABLE [db820b9a9] 2020-07-11 13:36:51 -0400
-->
     <para>
      Fix parallel restore of tables having both table-level privileges
      and per-column privileges (Tom Lane)
     </para>

     <para>
      The table-level privilege grants have to be applied first, but a
      parallel restore did not reliably order them that way; this could
      lead to <quote>tuple concurrently updated</quote> errors, or to
      disappearance of some per-column privilege grants.  The fix for this
      is to include dependency links between such entries in the archive
      file, meaning that a new dump has to be taken with a
      corrected <application>pg_dump</application> to ensure that the
      problem will not recur.
     </para>
    </listitem>

    <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [3f5863e15] 2020-06-15 20:59:40 -0400
Branch: REL_13_STABLE [a2c72851a] 2020-06-15 20:59:40 -0400
Branch: REL_12_STABLE [8e933596c] 2020-06-15 20:59:40 -0400
Branch: REL_11_STABLE [aeb785c0f] 2020-06-15 20:59:40 -0400
Branch: REL_10_STABLE [9170da96d] 2020-06-15 20:59:40 -0400
Branch: REL9_6_STABLE [5c1bfd627] 2020-06-15 20:59:40 -0400
Branch: REL9_5_STABLE [39c698cff] 2020-06-15 20:59:40 -0400
-->
     <para>
      Ensure that <application>pg_upgrade</application> runs
      with <varname>vacuum_defer_cleanup_age</varname> set to zero in the
      target cluster (Bruce Momjian)
     </para>

     <para>
      If the target cluster's configuration has been modified to
      set <varname>vacuum_defer_cleanup_age</varname> to a nonzero value,
      that prevented freezing of the system catalogs from working properly,
      which caused the upgrade to fail in confusing ways.  Ensure that any
      such setting is overridden for the duration of the upgrade.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master Release: REL_13_BR [cee9cadb5] 2020-05-13 20:42:09 -0700
Branch: REL_12_STABLE [73a5c0d81] 2020-05-13 20:42:24 -0700
Branch: REL_11_STABLE [a26789452] 2020-05-13 20:42:37 -0700
Branch: REL_10_STABLE [970ed4493] 2020-05-13 20:42:42 -0700
Branch: REL9_6_STABLE [1ab5b672e] 2020-05-13 20:42:46 -0700
Branch: REL9_5_STABLE [595b4115c] 2020-05-13 20:42:49 -0700
Author: Noah Misch <noah@leadboat.com>
Branch: master Release: REL_13_BR [8222a9d9a] 2020-05-13 20:42:09 -0700
Branch: REL_12_STABLE [7130be8aa] 2020-05-13 20:42:23 -0700
Branch: REL_11_STABLE [357012e17] 2020-05-13 20:42:34 -0700
Branch: REL_10_STABLE [a28db2081] 2020-05-13 20:42:42 -0700
-->
     <para>
      Fix <application>pg_recvlogical</application> to drain pending
      messages before exiting (Noah Misch)
     </para>

     <para>
      Without this, the replication sender might detect a send failure and
      exit without making the expected final update to the replication
      slot's LSN position.  That led to re-transmitting data after the
      next connection.  It was also possible to miss error messages sent
      after the last data that <application>pg_recvlogical</application>
      wants to consume.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [1d09fb1f0] 2020-07-15 15:17:23 +0900
Branch: REL_13_STABLE [5f89bb4cf] 2020-07-15 15:17:32 +0900
Branch: REL_12_STABLE [92927477f] 2020-07-15 15:17:36 +0900
Branch: REL_11_STABLE [c6d33d144] 2020-07-15 15:17:44 +0900
Branch: REL_10_STABLE [23924feca] 2020-07-15 15:17:49 +0900
Branch: REL9_6_STABLE [14fe80413] 2020-07-15 15:17:55 +0900
Branch: REL9_5_STABLE [18ec25412] 2020-07-15 15:18:01 +0900
-->
     <para>
      Fix <application>pg_rewind</application>'s handling of just-deleted
      files in the source data directory (Justin Pryzby, Michael Paquier)
     </para>

     <para>
      When working with an on-line source database, concurrent file
      deletions are possible, but <application>pg_rewind</application>
      would get confused if deletion happened between seeing a file's
      directory entry and examining it with <function>stat()</function>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [932f9fb50] 2020-07-16 15:52:37 +0900
Branch: REL_13_STABLE [beebbb39d] 2020-07-16 15:52:54 +0900
Branch: REL_12_STABLE [cd113a0b4] 2020-07-16 15:52:58 +0900
Branch: REL_11_STABLE [de559c2b0] 2020-07-16 15:53:01 +0900
Branch: REL_10_STABLE [800ec48f5] 2020-07-16 15:53:04 +0900
Branch: REL9_6_STABLE [a452b239e] 2020-07-16 15:53:09 +0900
Branch: REL9_5_STABLE [ab7ce97ec] 2020-07-16 15:53:12 +0900
-->
     <para>
      Make <application>pg_test_fsync</application> use binary I/O mode on
      Windows (Michael Paquier)
     </para>

     <para>
      Previously it wrote the test file in text mode, which is not an
      accurate reflection of <productname>PostgreSQL</productname>'s
      actual usage.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master Release: REL_13_BR [34dae902c] 2020-05-14 12:44:44 +0300
Branch: REL_12_STABLE [ae1f9b0a9] 2020-05-14 12:46:08 +0300
Branch: REL_11_STABLE [b9a45d8db] 2020-05-14 12:46:15 +0300
-->
     <para>
      Fix <filename>contrib/amcheck</filename> to not complain about
      deleted index pages that are empty (Alexander Korotkov)
     </para>

     <para>
      This state of affairs is normal during WAL replay.
     </para>
    </listitem>

    <listitem>
<!--
Author: Joe Conway <mail@joeconway.com>
Branch: master Release: REL_13_BR [9003b76e1] 2020-05-28 13:44:54 -0400
Branch: REL_12_STABLE [e8eb48595] 2020-05-28 13:44:59 -0400
Branch: REL_11_STABLE [49a00e07c] 2020-05-28 13:45:02 -0400
Branch: REL_10_STABLE [43d3d7318] 2020-05-28 13:45:06 -0400
Branch: REL9_6_STABLE [43d7934a3] 2020-05-28 13:45:11 -0400
Branch: REL9_5_STABLE [f140d9b6e] 2020-05-28 13:45:15 -0400
-->
     <para>
      Fix failure to initialize local state correctly
      in <filename>contrib/dblink</filename> (Joe Conway)
     </para>

     <para>
      With the right combination of circumstances, this could lead to
      <function>dblink_close()</function> issuing an unexpected
      remote <command>COMMIT</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b9b610577] 2020-07-23 17:20:01 -0400
Branch: REL_13_STABLE [7dab4569d] 2020-07-23 17:20:01 -0400
Branch: REL_12_STABLE [3d4a77815] 2020-07-23 17:20:02 -0400
Branch: REL_11_STABLE [475c69c97] 2020-07-23 17:20:03 -0400
Branch: REL_10_STABLE [d8ec3b126] 2020-07-23 17:20:03 -0400
Branch: REL9_6_STABLE [ccf964a80] 2020-07-23 17:20:04 -0400
Branch: REL9_5_STABLE [d0519e9fe] 2020-07-23 17:20:04 -0400
-->
     <para>
      Fix <filename>contrib/pgcrypto</filename>'s misuse
      of <function>deflate()</function> (Tom Lane)
     </para>

     <para>
      The <function>pgp_sym_encrypt</function> functions could produce
      incorrect compressed data due to mishandling
      of <application>zlib</application>'s API requirements.  We have no
      reports of this error manifesting with
      stock <application>zlib</application>, but it can be seen when using
      IBM's <application>zlibNX</application> implementation.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [a3ab7a707] 2020-07-27 15:58:32 +0900
Branch: REL_13_STABLE [0caf1fc6e] 2020-07-27 15:58:54 +0900
Branch: REL_12_STABLE [5bd087eb5] 2020-07-27 15:58:59 +0900
Branch: REL_11_STABLE [202fc4ca5] 2020-07-27 15:59:03 +0900
Branch: REL_10_STABLE [9729f9979] 2020-07-27 15:59:07 +0900
Branch: REL9_6_STABLE [8a60f541f] 2020-07-27 15:59:13 +0900
Branch: REL9_5_STABLE [aaa132a65] 2020-07-27 15:59:22 +0900
Branch: REL_11_STABLE [1785ac8ad] 2020-08-02 11:00:12 -0400
Branch: REL_10_STABLE [e1b4135cf] 2020-08-02 11:00:12 -0400
-->
     <para>
      Fix corner case in decompression logic
      in <filename>contrib/pgcrypto</filename>'s
      <function>pgp_sym_decrypt</function> functions (Kyotaro Horiguchi,
      Michael Paquier)
     </para>

     <para>
      A compressed stream can validly end with an empty packet, but the
      decompressor failed to handle this and would complain about corrupt
      data.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master Release: REL_13_BR [a16915545] 2020-05-14 09:24:33 +0530
Branch: REL_12_STABLE [98171e59a] 2020-05-14 09:34:46 +0530
Branch: REL_11_STABLE [1fbfc3d8a] 2020-05-14 09:39:04 +0530
Branch: REL_10_STABLE [33b772801] 2020-05-14 09:44:21 +0530
Branch: REL9_6_STABLE [a1466e194] 2020-05-14 09:50:10 +0530
Branch: REL9_5_STABLE [650952aeb] 2020-05-14 09:55:04 +0530
-->
     <para>
      Support building our NLS code with Microsoft Visual Studio 2015 or
      later (Juan Jos&eacute; Santamar&iacute;a Flecha, Davinder Singh,
      Amit Kapila)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master Release: REL_13_BR [d2a995990] 2020-05-21 14:41:15 +0900
Branch: REL_12_STABLE [089baec6f] 2020-05-21 14:41:30 +0900
Branch: REL_11_STABLE [bb24af50d] 2020-05-21 14:41:33 +0900
Branch: REL_10_STABLE [8dfc7d888] 2020-05-21 14:41:36 +0900
Branch: REL9_6_STABLE [57dc672c2] 2020-05-21 14:41:40 +0900
Branch: REL9_5_STABLE [8de137017] 2020-05-21 14:41:43 +0900
-->
     <para>
      Avoid possible failure of our MSVC install script when there is a
      file named <filename>configure</filename> several levels above the
      source code tree (Arnold M&uuml;ller)
     </para>

     <para>
      This could confuse some logic that looked
      for <filename>configure</filename> to identify the top level of the
      source tree.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-3">
  <title>Release 12.3</title>

  <formalpara>
  <title>Release date:</title>
  <para>2020-05-14</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.2.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.3</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 12.2,
    see <xref linkend="release-12-2"/>.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: David Rowley <drowley@postgresql.org>
Branch: master [3cb02e307] 2020-04-18 14:10:37 +1200
Branch: REL_12_STABLE [a375f11c4] 2020-04-18 14:11:21 +1200
-->
     <para>
      Fix possible failure with <literal>GENERATED</literal> columns
      (David Rowley)
     </para>

     <para>
      If a <literal>GENERATED</literal> column's value is an exact copy of
      another column of the table (and it is a pass-by-reference data
      type), it was possible to crash or insert corrupted data into the
      table.  While it would be rather pointless for
      a <literal>GENERATED</literal> expression to just duplicate another
      column, an expression using a function that sometimes returns its
      input unchanged could create the situation.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [086ffddf3] 2020-05-08 11:31:57 +0200
Branch: REL_12_STABLE [14751c340] 2020-05-08 11:31:46 +0200
-->
     <para>
      Handle inheritance of generated columns better (Peter Eisentraut)
     </para>

     <para>
      When a table column is inherited during <command>CREATE TABLE
      ... INHERITS</command>, disallow changing any generation properties
      when the parent column is already
      marked <literal>GENERATED</literal>; but allow a child column to be
      marked <literal>GENERATED</literal> when its parent is not.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [e92e4a2b6] 2020-04-09 16:36:45 +0200
Branch: REL_12_STABLE [f06d583c5] 2020-04-09 16:34:30 +0200
-->
     <para>
      Fix cross-column references in <command>CREATE TABLE LIKE INCLUDING
      GENERATED</command> (Peter Eisentraut)
     </para>

     <para>
      <command>CREATE TABLE ... LIKE</command> failed when trying to copy
      a <literal>GENERATED</literal> expression that references a
      physically-later column.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [501e41dd3] 2020-05-08 08:39:17 +0200
Branch: REL_12_STABLE [bf7233ee4] 2020-05-08 09:18:15 +0200
Branch: REL_11_STABLE [03a8a5f2d] 2020-05-08 09:30:57 +0200
-->
     <para>
      Propagate <command>ALTER TABLE ... SET STORAGE</command> to indexes
      (Peter Eisentraut)
     </para>

     <para>
      Non-expression index columns have always copied
      the <structfield>attstorage</structfield> property of their table
      column at creation.  Update them when <command>ALTER TABLE ... SET
      STORAGE</command> is done, to maintain consistency.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [a40caf5f8] 2020-04-06 11:03:49 +0900
Branch: REL_12_STABLE [3e62dd3a9] 2020-04-06 11:05:47 +0900
Branch: REL_11_STABLE [41faafbd7] 2020-04-06 11:05:54 +0900
Branch: REL_10_STABLE [cef2b8d52] 2020-04-06 11:05:57 +0900
Branch: REL9_6_STABLE [61a161fe4] 2020-04-06 11:06:04 +0900
Branch: REL9_5_STABLE [3f77a6702] 2020-04-06 11:06:07 +0900
-->
     <para>
      Preserve the <structfield>indisclustered</structfield> setting of
      indexes rewritten by <command>ALTER TABLE</command> (Amit Langote,
      Justin Pryzby)
     </para>

     <para>
      Previously, <command>ALTER TABLE</command> lost track of which index
      had been used for <command>CLUSTER</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [1cc9c2412] 2020-03-13 11:57:06 +0100
Branch: REL_12_STABLE [c9ef507e8] 2020-03-13 11:57:20 +0100
Branch: REL_11_STABLE [15cbbf81a] 2020-03-13 12:24:44 +0100
Branch: REL_10_STABLE [02530da73] 2020-03-13 13:03:28 +0100
Branch: REL9_6_STABLE [2f0dd9d93] 2020-03-13 13:21:05 +0100
Branch: REL9_5_STABLE [c15d35041] 2020-03-13 13:21:30 +0100
-->
     <para>
      Preserve the replica identity properties of indexes rewritten
      by <command>ALTER TABLE</command> (Quan Zongliang, Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [d79fb88ac] 2020-03-03 10:12:28 +0900
Branch: REL_12_STABLE [f087d63a4] 2020-03-03 10:12:49 +0900
-->
     <para>
      Preserve the <structfield>indisclustered</structfield> setting of
      indexes rebuilt by <command>REINDEX CONCURRENTLY</command>
      (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [5be594caf] 2020-05-06 12:29:41 -0400
Branch: REL_12_STABLE [2eea49471] 2020-05-06 12:29:41 -0400
Branch: REL_11_STABLE [59273a7ce] 2020-05-06 12:29:41 -0400
Branch: REL_10_STABLE [4d21263ff] 2020-05-06 12:29:41 -0400
Branch: REL9_6_STABLE [2bf56f50e] 2020-05-06 12:29:41 -0400
Branch: REL9_5_STABLE [91d97462c] 2020-05-06 12:29:41 -0400
-->
     <para>
      Lock objects sooner during <command>DROP OWNED BY</command>
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      This avoids failures in race-condition cases where another session is
      deleting some of the same objects.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [d9a4cce29] 2020-04-25 05:09:30 +0100
Branch: REL_12_STABLE [d0360632d] 2020-04-25 05:10:24 +0100
Branch: REL_11_STABLE [0f4970d1a] 2020-04-25 05:10:19 +0100
Branch: REL_10_STABLE [287f6d2d9] 2020-04-25 05:10:13 +0100
Branch: REL9_6_STABLE [86b7a4e6f] 2020-04-25 05:10:10 +0100
Branch: REL9_5_STABLE [b3824ca22] 2020-04-25 05:10:05 +0100
-->
     <para>
      Fix error-case processing for <command>CREATE ROLE ... IN
      ROLE</command> (Andrew Gierth)
     </para>

     <para>
      Some error cases would be reported as <quote>unexpected node
      type</quote> or the like, instead of the intended message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [afccd76f1] 2020-04-21 13:57:00 -0400
Branch: REL_12_STABLE [e26c8a6b3] 2020-04-21 13:57:00 -0400
Branch: REL_11_STABLE [0b83c4721] 2020-04-21 13:57:00 -0400
-->
     <para>
      Ensure that when a partition is detached, any triggers cloned from
      its formerly-parent table are removed (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [c0187869a] 2020-04-08 15:04:51 +0900
Branch: REL_12_STABLE [0a9ae1800] 2020-04-08 15:04:57 +0900
-->
     <para>
      Fix crash when <literal>COLLATE</literal> is applied to a
      non-collatable type in a partition bound expression (Dmitry Dolgov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [501b01879] 2020-04-01 14:49:49 -0400
Branch: REL_12_STABLE [76ea60696] 2020-04-01 14:49:49 -0400
Branch: REL_11_STABLE [76ddc88f4] 2020-04-01 14:49:49 -0400
-->
     <para>
      Ensure that unique indexes over partitioned tables match the
      equality semantics of the partitioning key (Guancheng Luo)
     </para>

     <para>
      This would only be an issue with index opclasses that have unusual
      notions of equality, but it's wrong in theory, so check.
     </para>
    </listitem>

    <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [7e4e57474] 2020-04-20 12:53:40 +0200
Branch: REL_12_STABLE [212e712a5] 2020-04-20 12:56:26 +0200
Branch: REL_11_STABLE [3d4652f67] 2020-04-20 12:57:12 +0200
Branch: REL_10_STABLE [d0bb66572] 2020-04-20 12:57:24 +0200
-->
     <para>
      Ensure that members of the <literal>pg_read_all_stats</literal> role
      can read all statistics views, as expected (Magnus Hagander)
     </para>

     <para>
      The functions underlying
      the <structname>pg_stat_progress_*</structname> views had not gotten
      this memo.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [baf17ad9d] 2020-04-24 12:02:36 -0400
Branch: REL_12_STABLE [64e49a67e] 2020-04-24 12:02:36 -0400
Branch: REL_11_STABLE [776f6d3d0] 2020-04-24 12:02:36 -0400
-->
     <para>
      Repair performance regression in
      <structname>information_schema</structname>.<structname>triggers</structname>
      view (Tom Lane)
     </para>

     <para>
      This patch redefines that view so that an
      outer <literal>WHERE</literal> clause constraining the table name
      can be pushed down into the view, allowing its calculations to be
      done only for triggers belonging to the table of interest rather
      than all triggers in the database.  In a database with many triggers
      this would make a significant speed difference for queries of that
      form.  Since things worked that way before v11, this is a potential
      performance regression.  Users who find this to be a problem can fix
      it by replacing the view definition (or, perhaps, just deleting and
      reinstalling the whole <structname>information_schema</structname>
      schema).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [607f8ce74] 2020-02-13 13:37:43 -0500
Branch: REL_12_STABLE [764a554d6] 2020-02-13 13:37:43 -0500
-->
     <para>
      Repair performance regression in floating point overflow/underflow
      detection (Emre Hasegeli)
     </para>

     <para>
      Previous refactoring had resulted in <function>isinf()</function>
      being called extra times in some hot code paths.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e81e5741a] 2020-04-27 12:21:04 -0400
Branch: REL_12_STABLE [18f7e856c] 2020-04-27 12:21:04 -0400
Branch: REL_11_STABLE [98a4d6950] 2020-04-27 12:21:04 -0400
Branch: REL_10_STABLE [072a86327] 2020-04-27 12:21:04 -0400
Branch: REL9_6_STABLE [22dcb6c20] 2020-04-27 12:21:04 -0400
-->
     <para>
      Fix full text search to handle NOT above a phrase search correctly
      (Tom Lane)
     </para>

     <para>
      Queries such as <literal>!(foo&lt;-&gt;bar)</literal> failed to find
      matching rows when implemented as a GiST or GIN index search.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [db89f0e3a] 2020-05-07 15:59:51 -0400
Branch: REL_12_STABLE [e1d70ba43] 2020-05-07 15:59:51 -0400
Branch: REL_11_STABLE [5db48808c] 2020-05-07 15:59:52 -0400
Branch: REL_10_STABLE [26cf16a93] 2020-05-07 15:59:52 -0400
Branch: REL9_6_STABLE [7c9d9aa5c] 2020-05-07 15:59:52 -0400
-->
     <para>
      Fix full text search for cases where a phrase search includes an
      item with both prefix matching and a weight restriction (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c9b0c678d] 2020-04-09 13:19:23 -0400
Branch: REL_12_STABLE [841378947] 2020-04-09 13:19:23 -0400
Branch: REL_11_STABLE [91be1d190] 2020-04-09 13:19:23 -0400
Branch: REL_10_STABLE [5f7247b3b] 2020-04-09 13:19:23 -0400
Branch: REL9_6_STABLE [c81de3a82] 2020-04-09 13:19:23 -0400
Branch: master [2e0e409e3] 2020-04-09 15:38:43 -0400
Branch: REL_12_STABLE [07453e9e3] 2020-04-09 15:38:52 -0400
Branch: REL_11_STABLE [d9a3fe4c5] 2020-04-09 15:38:57 -0400
Branch: REL_10_STABLE [9be664d71] 2020-04-09 15:39:02 -0400
Branch: REL9_6_STABLE [c2599b93d] 2020-04-09 15:39:09 -0400
Branch: master [b10f8bb9f] 2020-04-09 12:36:59 -0400
Branch: REL_12_STABLE [1306edeae] 2020-04-09 12:36:59 -0400
Branch: REL_11_STABLE [ff081d6bb] 2020-04-09 12:37:00 -0400
Branch: REL_10_STABLE [afab39986] 2020-04-09 12:37:00 -0400
Branch: REL9_6_STABLE [638519156] 2020-04-09 12:37:00 -0400
-->
     <para>
      Fix <function>ts_headline()</function> to make better headline
      selections when working with phrase queries (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e41955faf] 2020-04-03 13:15:45 -0400
Branch: REL_12_STABLE [05f4a8818] 2020-04-03 13:15:30 -0400
Branch: REL_11_STABLE [0912fb39c] 2020-04-03 13:15:30 -0400
Branch: REL_10_STABLE [44c763fe9] 2020-04-03 13:15:30 -0400
Branch: REL9_6_STABLE [49b0d13d7] 2020-04-03 13:15:30 -0400
Branch: REL9_5_STABLE [8150f7813] 2020-04-03 13:15:30 -0400
Branch: REL9_5_STABLE [e82b6e00a] 2020-04-06 12:29:54 -0400
-->
     <para>
      Fix bugs in <varname>gin_fuzzy_search_limit</varname> processing
      (Ad&eacute; Heyward, Tom Lane)
     </para>

     <para>
      A small value of <varname>gin_fuzzy_search_limit</varname> could
      result in unexpected slowness due to unintentionally rescanning the
      same index page many times.  Another code path failed to apply the
      intended filtering at all, possibly returning too many values.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [41a194f49] 2020-04-07 20:50:28 -0400
Branch: REL_12_STABLE [35d1eefb2] 2020-04-07 20:50:02 -0400
Branch: REL_11_STABLE [5fae66410] 2020-04-07 20:50:02 -0400
Branch: REL_10_STABLE [4c7a311a2] 2020-04-07 20:50:02 -0400
Branch: REL9_6_STABLE [049e9f48e] 2020-04-07 20:50:02 -0400
Branch: REL9_5_STABLE [ebd194ac5] 2020-04-07 20:50:02 -0400
-->
     <para>
      Allow input of type <type>circle</type> to accept the format
      <quote><literal>(<replaceable>x</replaceable>,<replaceable>y</replaceable>),<replaceable>r</replaceable></literal></quote>
      as the documentation says it does (David Zhang)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [26a944cf2] 2020-04-07 15:57:58 -0400
Branch: REL_12_STABLE [6e6b74a20] 2020-04-07 16:30:55 -0400
Branch: REL_11_STABLE [5d79fc60c] 2020-04-07 16:30:55 -0400
Branch: REL_10_STABLE [889786e0e] 2020-04-07 16:30:55 -0400
Branch: REL9_6_STABLE [e40c4d491] 2020-04-07 16:30:55 -0400
Branch: REL9_5_STABLE [dbb121038] 2020-04-07 16:30:55 -0400
-->
     <para>
      Make the <function>get_bit()</function>
      and <function>set_bit()</function> functions cope
      with <type>bytea</type> strings longer than 256MB (Movead Li)
     </para>

     <para>
      Since the bit number argument is only <type>int4</type>, it's
      impossible to use these functions to access bits beyond the first
      256MB of a long <type>bytea</type>.  We'll widen the argument
      to <type>int8</type> in v13, but in the meantime, allow these
      functions to work on the initial substring of a
      long <type>bytea</type>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [82e801852] 2020-03-31 12:57:55 -0400
Branch: REL_12_STABLE [ee40e8975] 2020-03-31 12:57:55 -0400
Branch: REL_11_STABLE [5b22ff764] 2020-03-31 12:57:55 -0400
Branch: REL_10_STABLE [83f7761d8] 2020-03-31 12:57:55 -0400
-->
     <para>
      Ignore file-not-found errors in <function>pg_ls_waldir()</function>
      and allied functions (Tom Lane)
     </para>

     <para>
      This prevents a race condition failure if a file is removed between
      when we see its directory entry and when we attempt
      to <function>stat()</function> it.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [085b6b667] 2020-03-11 15:27:59 -0400
Branch: REL_12_STABLE [3c8864fc1] 2020-03-11 15:27:59 -0400
Branch: REL_11_STABLE [63b51dfec] 2020-03-11 15:27:59 -0400
Branch: REL_10_STABLE [05283dd5b] 2020-03-11 15:28:00 -0400
Branch: master [a029a0641] 2020-03-11 18:24:11 -0400
Branch: REL_12_STABLE [630590d6f] 2020-03-11 18:24:13 -0400
Branch: REL_11_STABLE [13f353b0e] 2020-03-11 18:24:14 -0400
Branch: REL_10_STABLE [064e029e6] 2020-03-11 18:24:15 -0400
Branch: master [b4570d33a] 2020-03-16 21:05:52 -0400
Branch: REL_12_STABLE [2a89455aa] 2020-03-16 21:05:53 -0400
Branch: REL_11_STABLE [819d55257] 2020-03-16 21:05:54 -0400
Branch: REL_10_STABLE [5e4a0b719] 2020-03-16 21:05:55 -0400
Branch: REL9_6_STABLE [cd6a05187] 2020-03-16 21:05:56 -0400
Branch: REL9_5_STABLE [da254148f] 2020-03-16 21:05:29 -0400
-->
     <para>
      Avoid possibly leaking an open-file descriptor for a directory
      in <function>pg_ls_dir()</function>,
      <function>pg_timezone_names()</function>,
      <function>pg_tablespace_databases()</function>, and allied functions
      (Justin Pryzby)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4dbcb3f84] 2020-03-14 14:42:22 -0400
Branch: REL_12_STABLE [390984f92] 2020-03-14 14:42:22 -0400
Branch: REL_11_STABLE [540ef37cc] 2020-03-14 14:42:22 -0400
Branch: REL_10_STABLE [61d14971d] 2020-03-14 14:42:22 -0400
Branch: REL9_6_STABLE [30e491653] 2020-03-14 14:42:22 -0400
Branch: REL9_5_STABLE [a1ef0f373] 2020-03-14 14:42:22 -0400
-->
     <para>
      Fix polymorphic-function type resolution to correctly infer the
      actual type of an <type>anyarray</type> output when given only
      an <type>anyrange</type> input (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [b68a560f8] 2020-05-02 11:39:26 -0400
Branch: REL_12_STABLE [79e594cf0] 2020-05-02 11:39:32 -0400
-->
     <para>
      Fix server's connection-startup logic for case where a GSSAPI
      connection is rejected because support is not compiled in, and the
      client then tries SSL instead (Andrew Gierth)
     </para>

     <para>
      This led to a bogus <quote>unsupported frontend protocol</quote>
      failure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [46da7bf67] 2020-05-05 13:10:17 -0400
Branch: REL_12_STABLE [987717d7c] 2020-05-05 13:10:09 -0400
-->
     <para>
      Fix memory leakage during GSSAPI encryption (Tom Lane)
     </para>

     <para>
      Both the backend and libpq would leak memory equivalent to the total
      amount of data sent during the session, if GSSAPI encryption is in use.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [299298bc8] 2020-04-22 19:53:06 -0700
Branch: REL_12_STABLE [95695c784] 2020-04-22 19:55:53 -0700
-->
     <para>
      Fix query-lifespan memory leak for a set-returning function used in
      a query's <literal>FROM</literal> clause (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [58c47ccff] 2020-02-29 13:48:09 -0500
Branch: REL_12_STABLE [96d783ae5] 2020-02-29 13:48:10 -0500
Branch: REL_11_STABLE [9eb6b652a] 2020-02-29 13:48:10 -0500
-->
     <para>
      Avoid leakage of a hashed subplan's hash tables across multiple
      executions (Andreas Karlsson, Tom Lane)
     </para>

     <para>
      This mistake could result in severe memory bloat if a query
      re-executed a hashed subplan enough times.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a477bfc1d] 2020-02-26 18:14:12 -0500
Branch: REL_12_STABLE [30d5c6bf2] 2020-02-26 18:14:13 -0500
-->
     <para>
      Improve planner's handling of no-op domain coercions (Tom Lane)
     </para>

     <para>
      Fix some cases where a domain coercion that does nothing was not
      completely removed from expressions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d12bdba77] 2020-04-21 15:58:42 -0400
Branch: REL_12_STABLE [5a4efd100] 2020-04-21 15:58:42 -0400
Branch: REL_11_STABLE [56259c377] 2020-04-21 15:58:42 -0400
Branch: REL_10_STABLE [e6c17c85a] 2020-04-21 15:58:42 -0400
Branch: REL9_6_STABLE [5c1c27eef] 2020-04-21 15:58:43 -0400
Branch: REL9_5_STABLE [36714f8ca] 2020-04-21 15:58:43 -0400
-->
     <para>
      Avoid unlikely crash when <command>REINDEX</command> is terminated
      by a session-shutdown signal (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5c27bce7f] 2020-04-11 12:29:06 -0400
Branch: REL_12_STABLE [8ffb86644] 2020-04-11 12:29:06 -0400
Branch: REL_11_STABLE [f3d06e524] 2020-04-11 12:29:06 -0400
Branch: REL_10_STABLE [1e6bb6125] 2020-04-11 12:29:06 -0400
Branch: REL9_6_STABLE [242ca479f] 2020-04-11 12:29:06 -0400
Branch: REL9_5_STABLE [30ce86367] 2020-04-11 12:29:06 -0400
-->
     <para>
      Prevent printout of possibly-incorrect hash join table statistics
      in <command>EXPLAIN</command> (Konstantin Knizhnik, Tom Lane, Thomas
      Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [007491979] 2020-02-19 20:37:26 +0900
Branch: REL_12_STABLE [16e6c968b] 2020-02-19 20:38:38 +0900
Branch: REL_11_STABLE [414ed1ca2] 2020-02-19 20:39:02 +0900
Branch: REL_10_STABLE [79f344d52] 2020-02-19 20:39:37 +0900
Branch: REL9_6_STABLE [307c27037] 2020-02-19 20:40:38 +0900
Branch: REL9_5_STABLE [4a3f164b7] 2020-02-19 20:43:59 +0900
-->
     <para>
      Fix reporting of elapsed time for heap truncation steps
      in <command>VACUUM VERBOSE</command> (Tatsuhito Kasahara)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [73a076b03] 2020-05-01 09:51:09 -0700
Branch: REL_12_STABLE [40708eaaf] 2020-05-01 09:51:08 -0700
Branch: REL_11_STABLE [d3944c364] 2020-05-01 09:51:06 -0700
-->
     <para>
      Fix possible undercounting of deleted B-tree index pages
      in <command>VACUUM VERBOSE</command> output (Peter Geoghegan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [b0229f26d] 2020-05-01 08:39:52 -0700
Branch: REL_12_STABLE [05b73261c] 2020-05-01 08:39:51 -0700
Branch: REL_11_STABLE [e4fa6c929] 2020-05-01 08:39:49 -0700
Branch: master [69cf853fe] 2020-05-01 12:19:44 -0700
Branch: REL_12_STABLE [e1477db92] 2020-05-01 12:19:42 -0700
Branch: REL_11_STABLE [573478564] 2020-05-01 12:19:39 -0700
-->
     <para>
      Fix wrong bookkeeping for oldest deleted page in a B-tree index
      (Peter Geoghegan)
     </para>

     <para>
      This could cause subtly wrong decisions about
      when <command>VACUUM</command> can skip an index cleanup scan;
      although it appears there may be no significant user-visible effects
      from that.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [f2ff20359] 2020-05-08 10:36:40 +0900
Branch: REL_12_STABLE [a354d0153] 2020-05-08 10:38:01 +0900
Branch: REL_11_STABLE [cc534fc3b] 2020-05-08 10:38:45 +0900
Branch: REL_10_STABLE [3a48740e8] 2020-05-08 10:39:08 +0900
-->
     <para>
      Ensure that TimelineHistoryRead and TimelineHistoryWrite wait states
      are reported in all code paths that read or write timeline history
      files (Masahiro Ikeda)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [17d3fcdc3] 2020-03-10 00:14:43 +0900
Branch: REL_12_STABLE [82c04e483] 2020-03-10 00:15:25 +0900
Branch: REL_11_STABLE [e54183cb0] 2020-03-10 00:16:48 +0900
Branch: REL_10_STABLE [e9c4eaacd] 2020-03-10 00:18:24 +0900
Branch: REL9_6_STABLE [d1b414e7e] 2020-03-10 00:19:57 +0900
Branch: REL9_5_STABLE [c9a47b81e] 2020-03-10 00:23:22 +0900
-->
     <para>
      Avoid possibly showing <quote>waiting</quote> twice in a process's
      PS status (Masahiko Sawada)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [fe3036527] 2020-03-31 17:06:22 -0400
Branch: REL_12_STABLE [6c426cd43] 2020-03-31 17:06:22 -0400
-->
     <para>
      Avoid race condition when <command>ANALYZE</command> replaces the
      catalog tuple for extended statistics data (Dean Rasheed)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [dd9ac7d5d] 2020-03-31 08:27:47 +0900
Branch: REL_12_STABLE [3ec8576a0] 2020-03-31 08:27:54 +0900
-->
     <para>
      Remove ill-considered skip of <quote>redundant</quote>
      anti-wraparound vacuums (Michael Paquier)
     </para>

     <para>
      This avoids a corner case where autovacuum could get into a loop of
      repeatedly trying and then skipping the same vacuum job.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: master [4b42a8993] 2020-03-30 12:03:59 -0700
Branch: REL_12_STABLE [97cda93d8] 2020-03-30 12:03:57 -0700
-->
     <para>
      Ensure INCLUDE'd columns are always removed from B-tree pivot tuples
      (Peter Geoghegan)
     </para>

     <para>
      This mistake wasted space in some rare cases, but was otherwise
      harmless.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [61d7c7bce] 2020-03-10 15:38:17 +0900
Branch: REL_12_STABLE [8bca5f935] 2020-03-10 15:38:34 +0900
-->
     <para>
      Cope with invalid TOAST indexes that could be left over after a
      failed <command>REINDEX CONCURRENTLY</command> (Julien Rouhaud)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [fbcf08711] 2020-03-05 12:50:15 +0900
Branch: REL_12_STABLE [26876127b] 2020-03-05 12:50:23 +0900
-->
     <para>
      Ensure that valid index dependencies are left behind after a
      failed <command>REINDEX CONCURRENTLY</command> (Michael Paquier)
     </para>

     <para>
      Previously the old index could be left with
      no <structname>pg_depend</structname> links at all, so that for
      example it would not get dropped if the parent table is dropped.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [80d76be51] 2020-02-28 20:28:34 -0500
Branch: REL_12_STABLE [d7684c38a] 2020-02-28 20:28:34 -0500
Branch: REL_11_STABLE [7ea20a2bc] 2020-02-28 20:28:34 -0500
-->
     <para>
      Avoid failure if autovacuum tries to access a just-dropped temporary
      schema (Tom Lane)
     </para>

     <para>
      This hazard only arises if a superuser manually drops a temporary
      schema; which isn't normal practice, but should work.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [4e87c4836] 2020-04-24 08:48:28 +0900
Branch: REL_12_STABLE [22db5269b] 2020-04-24 08:48:35 +0900
Branch: REL_11_STABLE [2d24ca00b] 2020-04-24 08:48:40 +0900
Branch: REL_10_STABLE [02657c421] 2020-04-24 08:48:45 +0900
Branch: REL9_6_STABLE [c2d8ae0df] 2020-04-24 08:48:51 +0900
Branch: REL9_5_STABLE [9eff11653] 2020-04-24 08:48:55 +0900
Branch: master [f9c1b8dba] 2020-04-24 11:33:41 +0900
Branch: REL_12_STABLE [26057550d] 2020-04-24 11:33:58 +0900
Branch: REL_11_STABLE [0d04e9d76] 2020-04-24 11:34:03 +0900
Branch: REL_10_STABLE [3d9cae5ad] 2020-04-24 11:34:06 +0900
Branch: REL9_6_STABLE [11f004699] 2020-04-24 11:34:11 +0900
Branch: REL9_5_STABLE [a4726998d] 2020-04-24 11:34:16 +0900
-->
     <para>
      Avoid premature recycling of WAL segments during crash recovery
      (Jehan-Guillaume de Rorthais)
     </para>

     <para>
      WAL segments that become ready to be archived during crash recovery
      were potentially recycled without being archived.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [4bd0ad9e4] 2020-04-08 00:49:29 +0900
Branch: REL_12_STABLE [683e0ef55] 2020-05-09 12:00:27 +0900
Branch: REL_11_STABLE [dcd1569fb] 2020-05-09 12:04:51 +0900
Branch: REL_10_STABLE [660f1fc40] 2020-05-09 12:11:11 +0900
Branch: REL9_6_STABLE [70b597974] 2020-05-09 12:16:37 +0900
Branch: REL9_5_STABLE [e3f5b148e] 2020-05-09 12:19:47 +0900
-->
     <para>
      Avoid scanning irrelevant timelines during archive recovery (Kyotaro
      Horiguchi)
     </para>

     <para>
      This can eliminate many attempts to fetch non-existent WAL files from
      archive storage, which is helpful if archive access is slow.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [e3ff789ac] 2020-02-19 08:15:49 +0530
Branch: REL_12_STABLE [59112f235] 2020-02-19 08:27:15 +0530
Branch: REL_11_STABLE [bff456d7a] 2020-02-19 08:35:16 +0530
Branch: REL_10_STABLE [b448aa441] 2020-02-19 08:44:16 +0530
Branch: REL9_6_STABLE [59c1a03f0] 2020-02-19 08:52:08 +0530
Branch: REL9_5_STABLE [05555f7aa] 2020-02-19 08:59:18 +0530
-->
     <para>
      Remove bogus <quote>subtransaction logged without previous top-level
      txn record</quote> error check in logical decoding (Arseny Sher,
      Amit Kapila)
     </para>

     <para>
      This condition is legitimately reachable in various scenarios, so
      remove the check.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [bcd1c3630] 2020-03-17 16:13:18 -0300
Branch: REL_12_STABLE [e58e13e84] 2020-03-17 16:13:18 -0300
-->
     <para>
      Avoid possible failure after a replication slot copy, due to
      premature removal of WAL data (Masahiko Sawada, Arseny Sher)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [49bf81536] 2020-03-26 13:29:20 +0100
Branch: REL_12_STABLE [223e9c77d] 2020-03-26 13:31:07 +0100
Branch: REL_11_STABLE [ba4cc05ce] 2020-03-26 13:51:07 +0100
Branch: REL_10_STABLE [f36a10434] 2020-03-26 13:51:22 +0100
Branch: REL9_6_STABLE [2d8597ba6] 2020-03-26 14:01:56 +0100
Branch: REL9_5_STABLE [ce28a43ff] 2020-03-26 14:08:15 +0100
Branch: master [a9d9bdd3a] 2020-04-05 10:02:00 +0200
Branch: REL_12_STABLE [d278d4e1a] 2020-04-05 10:03:04 +0200
Branch: REL_11_STABLE [250041a56] 2020-04-05 10:03:41 +0200
Branch: REL_10_STABLE [038c9bbe9] 2020-04-05 10:04:13 +0200
Branch: REL9_6_STABLE [3dcaea4b0] 2020-04-05 10:04:26 +0200
Branch: REL9_5_STABLE [72b2b9c52] 2020-04-05 10:05:18 +0200
-->
     <para>
      Ensure that a replication
      slot's <literal>io_in_progress_lock</literal> is released in failure
      code paths (Pavan Deolasee)
     </para>

     <para>
      This could result in a walsender later becoming stuck waiting for
      the lock.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [ad3ae6477] 2020-02-17 15:20:57 +0100
Branch: REL_12_STABLE [4a97f647d] 2020-02-17 15:21:12 +0100
-->
     <para>
      Ensure that generated columns are correctly handled during updates
      issued by logical replication (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f332241a6] 2020-04-18 14:02:44 -0400
Branch: REL_12_STABLE [00ef5d52c] 2020-04-18 14:02:44 -0400
Branch: REL_11_STABLE [b3fa6d016] 2020-04-18 14:02:44 -0400
Branch: REL_10_STABLE [63ecdaf75] 2020-04-18 14:02:44 -0400
Branch: REL9_6_STABLE [c65c1aa82] 2020-04-18 14:02:45 -0400
-->
     <para>
      Fix race conditions in synchronous standby management (Tom Lane)
     </para>

     <para>
      During a change in the <varname>synchronous_standby_names</varname>
      setting, there was a window in which wrong decisions could be made
      about whether it is OK to release transactions that are waiting for
      synchronous commit.  Another hazard for similarly wrong decisions
      existed if a walsender process exited and was immediately replaced
      by another.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [b4f140869] 2020-03-18 09:27:14 +0530
Branch: REL_12_STABLE [e37824136] 2020-03-18 09:33:01 +0530
Branch: REL_11_STABLE [18c41cb6b] 2020-03-18 09:37:08 +0530
Branch: REL_10_STABLE [569f9354b] 2020-03-18 09:46:52 +0530
Branch: REL9_6_STABLE [fe27ce1c1] 2020-03-18 10:08:56 +0530
Branch: REL9_5_STABLE [6bdfe428d] 2020-03-18 10:10:27 +0530
-->
     <para>
      Add missing SQLSTATE values to a few error reports (Sawada Masahiko)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [761a5688b] 2020-02-19 14:45:17 -0500
Branch: REL_12_STABLE [32aa14d40] 2020-02-19 14:44:58 -0500
Branch: REL_11_STABLE [612d207bc] 2020-02-19 14:44:58 -0500
Branch: REL_10_STABLE [6af63cf8c] 2020-02-19 14:44:58 -0500
Branch: REL9_6_STABLE [3e5308969] 2020-02-19 14:44:58 -0500
Branch: REL9_5_STABLE [bbefb1154] 2020-02-19 14:44:58 -0500
-->
     <para>
      Fix PL/pgSQL to reliably refuse to execute an event trigger function
      as a plain function (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [27dbe1a18] 2020-04-22 07:27:03 +0900
Branch: REL_12_STABLE [e1c08722a] 2020-04-22 07:27:45 +0900
Branch: REL_11_STABLE [35d08658d] 2020-04-22 07:27:49 +0900
Branch: REL_10_STABLE [1bb0293d8] 2020-04-22 07:27:53 +0900
Branch: REL9_6_STABLE [c9c15790d] 2020-04-22 07:28:00 +0900
Branch: REL9_5_STABLE [e5e295d50] 2020-04-22 07:28:04 +0900
-->
     <para>
      Fix memory leak in <application>libpq</application> when
      using <literal>sslmode=verify-full</literal> (Roman Peshkurov)
     </para>

     <para>
      Certificate verification during connection startup could leak some
      memory.  This would become an issue if a client process opened many
      database connections during its lifetime.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [980a70b97] 2020-03-23 11:58:00 -0400
Branch: REL_12_STABLE [036fdf6be] 2020-03-23 11:58:01 -0400
Branch: REL_11_STABLE [aae7e8530] 2020-03-23 11:58:01 -0400
Branch: REL_10_STABLE [ef7d6d79a] 2020-03-23 11:58:01 -0400
Branch: REL9_6_STABLE [c0eb57dd9] 2020-03-23 11:58:01 -0400
Branch: REL9_5_STABLE [5f9eace5d] 2020-03-23 11:58:01 -0400
-->
     <para>
      Fix <application>ecpg</application> to treat an argument of
      just <quote><literal>-</literal></quote> as meaning <quote>read
      from stdin</quote> on all platforms (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [8d84dd001] 2020-04-01 14:45:45 +0900
Branch: REL_12_STABLE [f79bea4b6] 2020-04-01 14:45:57 +0900
-->
     <para>
      Fix crash in <application>psql</application> when attempting to
      re-establish a failed connection (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [08481eedd] 2020-03-31 23:01:34 -0400
Branch: REL_12_STABLE [6a50f1af4] 2020-03-31 23:01:33 -0400
Branch: REL_11_STABLE [7054e12e0] 2020-03-31 23:01:33 -0400
Branch: REL_10_STABLE [a936012d6] 2020-03-31 23:01:33 -0400
-->
     <para>
      Allow tab-completion of the filename argument
      to <application>psql</application>'s <command>\gx</command> command
      (Vik Fearing)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [b08dee24a] 2020-03-11 16:54:54 -0300
Branch: REL_12_STABLE [f977e6dec] 2020-03-11 16:54:54 -0300
Branch: REL_11_STABLE [e70187c9b] 2020-03-11 16:54:54 -0300
Branch: REL_10_STABLE [d04e342ba] 2020-03-11 16:54:54 -0300
Branch: REL9_6_STABLE [2b9d70159] 2020-03-11 16:54:54 -0300
Branch: master [046001fe3] 2020-03-16 16:27:13 -0300
Branch: REL_12_STABLE [cf72898c6] 2020-03-16 16:27:13 -0300
Branch: REL_11_STABLE [55978e28c] 2020-03-16 16:27:13 -0300
Branch: REL_10_STABLE [c6b75b3f1] 2020-03-16 16:27:13 -0300
Branch: REL9_6_STABLE [7984c7e9f] 2020-03-16 16:27:13 -0300
Branch: master [899a04f5e] 2020-03-11 11:04:59 -0300
Branch: REL_12_STABLE [b7739ebec] 2020-03-11 11:04:59 -0300
Branch: REL_11_STABLE [7c094a11c] 2020-03-11 11:04:59 -0300
Branch: REL_10_STABLE [3dfd2d6cd] 2020-03-11 11:04:59 -0300
Branch: REL9_6_STABLE [73b31e784] 2020-03-11 11:04:59 -0300
-->
     <para>
      Add <application>pg_dump</application> support for <command>ALTER
      ... DEPENDS ON EXTENSION</command> (&Aacute;lvaro Herrera)
     </para>

     <para>
      <application>pg_dump</application> previously ignored dependencies added
      this way, causing them to be forgotten during dump/restore or
      <application>pg_upgrade</application>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f31364676] 2020-02-17 18:40:02 -0500
Branch: REL_12_STABLE [6da7d3630] 2020-02-17 18:40:02 -0500
Branch: REL_11_STABLE [bd2cd138f] 2020-02-17 18:40:02 -0500
Branch: REL_10_STABLE [f9d7bb68d] 2020-02-17 18:40:02 -0500
Branch: REL9_6_STABLE [3380b9931] 2020-02-17 18:40:02 -0500
Branch: REL9_5_STABLE [d9ec8d1d7] 2020-02-17 18:40:02 -0500
-->
     <para>
      Fix <application>pg_dump</application> to dump comments on RLS
      policy objects (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8728b2c70] 2020-03-09 14:58:26 -0400
Branch: REL_12_STABLE [4c40b27b5] 2020-03-09 14:58:11 -0400
Branch: REL_11_STABLE [f5d49f226] 2020-03-09 14:58:11 -0400
Branch: REL_10_STABLE [475b061c8] 2020-03-09 14:58:11 -0400
Branch: REL9_6_STABLE [fab545635] 2020-03-09 14:58:11 -0400
Branch: REL9_5_STABLE [0b0247644] 2020-03-09 14:58:11 -0400
Branch: master [a9d70c108] 2020-04-08 11:23:39 -0400
Branch: REL_12_STABLE [983ed99a6] 2020-04-08 11:23:39 -0400
Branch: REL_11_STABLE [d050c6113] 2020-04-08 11:23:39 -0400
Branch: REL_10_STABLE [830471e0d] 2020-04-08 11:23:39 -0400
Branch: REL9_6_STABLE [778066052] 2020-04-08 11:23:40 -0400
Branch: REL9_5_STABLE [564c1e6d7] 2020-04-08 11:23:40 -0400
-->
     <para>
      In <application>pg_dump</application>, postpone restore of event
      triggers till the end (Fabr&iacute;zio de Royes Mello, Hamid Akhtar,
      Tom Lane)
     </para>

     <para>
      This minimizes the risk that an event trigger could interfere with
      the restoration of other objects.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [0278d3f79] 2020-04-27 13:04:35 -0400
Branch: REL_12_STABLE [a08bfe742] 2020-04-27 14:00:36 -0400
-->
     <para>
      Ensure that <application>pg_basebackup</application> generates valid
      tar files (Robert Haas)
     </para>

     <para>
      In some cases a partial block of zeroes would be added to the end of
      the file.  While this seems to be harmless with common versions of
      tar, it's not OK per the POSIX file format spec.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [428a2609e] 2020-02-27 15:31:27 +0900
Branch: REL_12_STABLE [f6e8e8b38] 2020-02-27 15:31:48 +0900
Branch: REL_11_STABLE [8f9aba187] 2020-02-27 15:31:52 +0900
-->
     <para>
      Make <application>pg_checksums</application> skip tablespace
      subdirectories that belong to a
      different <productname>PostgreSQL</productname> major version
      (Michael Banck, Bernd Helmle)
     </para>

     <para>
      Such subdirectories don't really belong to our database cluster, and
      so must not be processed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [bf883b211] 2020-02-24 18:13:25 +0900
Branch: REL_12_STABLE [a8beece95] 2020-02-24 18:14:16 +0900
Branch: REL_11_STABLE [da2a7180a] 2020-02-24 18:14:22 +0900
-->
     <para>
      Ignore temporary copies of <filename>pg_internal.init</filename>
      in <application>pg_checksums</application> and related
      programs (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [008cf0409] 2020-02-27 11:20:46 +0900
Branch: REL_12_STABLE [943affb3d] 2020-02-27 11:21:00 +0900
Branch: REL_11_STABLE [83bd732eb] 2020-02-27 11:21:07 +0900
Branch: REL_10_STABLE [240c7c75f] 2020-02-27 11:21:14 +0900
Branch: REL9_6_STABLE [3340034f2] 2020-02-27 11:21:23 +0900
Branch: REL9_5_STABLE [49300e4cf] 2020-02-27 11:21:28 +0900
Branch: master [c4b0edb07] 2020-02-27 21:58:37 +0900
Branch: REL_12_STABLE [aeb846edb] 2020-02-27 21:58:45 +0900
Branch: REL_11_STABLE [8e076f4f9] 2020-02-27 21:58:50 +0900
-->
     <para>
      Fix quoting of <option>--encoding</option>, <option>--lc-ctype</option>
      and <option>--lc-collate</option> values
      in <application>createdb</application> utility (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6dd9f3577] 2020-04-03 11:24:56 -0400
Branch: REL_12_STABLE [d56657c35] 2020-04-03 11:24:56 -0400
Branch: REL_11_STABLE [7b1552283] 2020-04-03 11:24:56 -0400
Branch: REL_10_STABLE [85f0d4703] 2020-04-03 11:24:56 -0400
Branch: REL9_6_STABLE [a9f821f48] 2020-04-03 11:24:56 -0400
Branch: REL9_5_STABLE [82bc56e63] 2020-04-03 11:24:56 -0400
-->
     <para>
      <filename>contrib/lo</filename>'s <function>lo_manage()</function>
      function crashed if called directly rather than as a trigger (Tom
      Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [95f7ddfda] 2020-03-28 17:09:51 -0400
Branch: REL_12_STABLE [2bb6bdbe5] 2020-03-28 17:09:51 -0400
Branch: REL_11_STABLE [5feb3d0b3] 2020-03-28 17:09:51 -0400
Branch: REL_10_STABLE [2618ac6c6] 2020-03-28 17:09:51 -0400
Branch: REL9_6_STABLE [39491aa0d] 2020-03-28 17:09:51 -0400
Branch: REL9_5_STABLE [8e1e630d0] 2020-03-28 17:09:52 -0400
-->
     <para>
      In <filename>contrib/ltree</filename>,
      protect against overflow of <type>ltree</type>
      and <type>lquery</type> length fields (Nikita Glukhov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
Branch: REL_12_STABLE [393b449f1] 2020-03-11 14:15:02 -0700
Branch: REL_11_STABLE [c788115b5] 2020-03-11 14:15:00 -0700
-->
     <para>
      Work around failure in <filename>contrib/pageinspect</filename>'s
      <function>bt_metap()</function> function when an oldest_xact value
      exceeds 2^31-1 (Peter Geoghegan)
     </para>

     <para>
      Such XIDs will now be reported as negative integers, which isn't
      great but it beats throwing an error.  v13 will widen the output
      argument to <type>int8</type> to provide saner reporting.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [fc576b7c4] 2020-04-16 14:45:54 -0400
Branch: REL_12_STABLE [687e566b9] 2020-04-16 14:45:54 -0400
Branch: REL_11_STABLE [cc2737ab0] 2020-04-16 14:45:54 -0400
Branch: REL_10_STABLE [f4a420056] 2020-04-16 14:45:54 -0400
Branch: REL9_6_STABLE [3cdf2421a] 2020-04-16 14:45:54 -0400
Branch: REL9_5_STABLE [46b1b6379] 2020-04-16 14:45:54 -0400
-->
     <para>
      Fix cache reference leak in <filename>contrib/sepgsql</filename>
      (Michael Luo)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e02ea141e] 2020-02-16 12:20:18 -0500
Branch: REL_12_STABLE [de5e03f7f] 2020-02-16 12:20:18 -0500
-->
     <para>
      On Windows, avoid premature creation of postmaster's log file
      during <literal>pg_ctl start</literal> (Alexander Lakhin)
     </para>

     <para>
      The previous coding could allow the file to be created with
      permissions that wouldn't allow the postmaster to write on it.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8c49454ca] 2020-03-30 11:14:58 -0400
Branch: REL_12_STABLE [de5b9db36] 2020-03-30 11:14:58 -0400
Branch: REL_11_STABLE [4bc3a1667] 2020-03-30 11:14:58 -0400
Branch: REL_10_STABLE [d59e83cf5] 2020-03-30 11:14:58 -0400
Branch: REL9_6_STABLE [f15f5edee] 2020-03-30 11:14:58 -0400
Branch: REL9_5_STABLE [6dac1e858] 2020-03-30 11:14:58 -0400
-->
     <para>
      Avoid failures when dealing with Unix-style locale names on
      Windows (Juan Jos&eacute; Santamar&iacute;a Flecha)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [3b77dce86] 2020-03-02 15:45:34 +0900
Branch: REL_12_STABLE [3b5709e66] 2020-03-02 15:46:24 +0900
-->
     <para>
      On Windows, set console VT100 compatibility mode in
      programs that support <varname>PG_COLOR</varname> colorization
      (Juan Jos&eacute; Santamar&iacute;a Flecha)
     </para>

     <para>
      Without this, the colorization option doesn't actually work.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e3a87b499] 2020-03-24 11:49:00 -0400
Branch: REL_12_STABLE [a86715451] 2020-03-24 11:48:33 -0400
-->
     <para>
      Stop requiring extra parentheses in <function>ereport()</function>
      calls (Andres Freund, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0bc8cebdb] 2020-03-17 12:09:26 -0400
Branch: REL_12_STABLE [d8e7f8149] 2020-03-17 12:09:26 -0400
Branch: REL_11_STABLE [9af2f7dc9] 2020-03-17 12:09:27 -0400
Branch: REL_10_STABLE [d67d7243f] 2020-03-17 12:09:27 -0400
-->
     <para>
      Use <application>pkg-config</application>, if available, to
      locate <application>libxml2</application>
      during <application>configure</application> (Hugh McMaster, Tom
      Lane, Peter Eisentraut)
     </para>

     <para>
      If <application>pkg-config</application> is not present or lacks
      knowledge of <application>libxml2</application>, we still
      query <application>xml2-config</application> as before.
     </para>

     <para>
      This change could break build processes that try to
      make <productname>PostgreSQL</productname> use a non-default version
      of <application>libxml2</application> by putting that
      version's <application>xml2-config</application> into
      the <varname>PATH</varname>.  Instead,
      set <varname>XML2_CONFIG</varname> to point to the
      non-default <application>xml2-config</application>.  That method
      will work with either older or
      newer <productname>PostgreSQL</productname> releases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [051fd5e0f] 2020-03-31 14:17:32 -0400
Branch: REL_12_STABLE [297a174d2] 2020-03-31 14:17:32 -0400
-->
     <para>
      Fix Makefile dependencies for <application>libpq</application>
      and <application>ecpg</application> (Dagfinn Ilmari Mannsåker)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [beb2516e9] 2020-05-06 21:08:15 +0900
Branch: REL_12_STABLE [8c0939dad] 2020-05-06 21:08:22 +0900
Branch: REL_11_STABLE [984aca448] 2020-05-06 21:08:26 +0900
Branch: REL_10_STABLE [307ed98b0] 2020-05-06 21:08:31 +0900
Branch: REL9_6_STABLE [e07fdc126] 2020-05-06 21:08:38 +0900
Branch: REL9_5_STABLE [ad53d6efe] 2020-05-06 21:08:42 +0900
-->
     <para>
      In MSVC builds, cope with spaces in the path name for Python
      (Victor Wagner)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [a9659fb65] 2020-04-17 14:44:33 -0400
Branch: REL_12_STABLE [6b02bee66] 2020-04-17 14:52:42 -0400
Branch: REL_11_STABLE [758814224] 2020-04-17 14:53:56 -0400
Branch: REL_10_STABLE [ddac64f2d] 2020-04-17 14:55:55 -0400
Branch: REL9_6_STABLE [4c9239d08] 2020-04-17 14:56:56 -0400
Branch: REL9_5_STABLE [3ca17999f] 2020-04-17 14:57:15 -0400
-->
     <para>
      In MSVC builds, fix detection of Visual Studio version to work with
      more language settings (Andrew Dunstan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [71c2fd0c0] 2020-03-20 13:55:15 -0400
Branch: REL_12_STABLE [d0747714e] 2020-03-20 14:02:05 -0400
Branch: REL_11_STABLE [e8a6391fc] 2020-03-20 14:02:15 -0400
Branch: REL_10_STABLE [3163349fd] 2020-03-20 14:02:43 -0400
Branch: REL9_6_STABLE [80370836f] 2020-03-20 14:03:13 -0400
Branch: REL9_5_STABLE [467b40832] 2020-03-20 14:03:31 -0400
-->
     <para>
      In MSVC builds, use <literal>-Wno-deprecated</literal> with bison
      versions newer than 3.0, as non-Windows builds already do (Andrew
      Dunstan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4cac3a49e] 2020-04-24 10:54:47 -0400
Branch: REL_12_STABLE [c820692bd] 2020-04-24 10:55:00 -0400
Branch: REL_11_STABLE [eb335bc62] 2020-04-24 10:55:05 -0400
Branch: REL_10_STABLE [898921a18] 2020-04-24 10:55:10 -0400
Branch: REL9_6_STABLE [66be99742] 2020-04-24 10:55:17 -0400
Branch: REL9_5_STABLE [39006ae7a] 2020-04-24 10:55:23 -0400
Branch: master [6c5f91616] 2020-04-24 17:53:23 -0400
Branch: REL_12_STABLE [1e07e3fc0] 2020-04-24 17:53:23 -0400
Branch: REL_11_STABLE [b31f9fd63] 2020-04-24 17:53:23 -0400
Branch: REL_10_STABLE [40d4bc5ac] 2020-04-24 17:53:23 -0400
Branch: REL9_6_STABLE [f65f3a5d8] 2020-04-24 17:53:23 -0400
Branch: REL9_5_STABLE [3cdb45c54] 2020-04-24 17:53:23 -0400
Branch: master [bd8c5cee9] 2020-04-24 17:21:44 -0400
Branch: REL_12_STABLE [a2342c658] 2020-04-24 17:21:44 -0400
Branch: REL_11_STABLE [99c9ed224] 2020-04-24 17:21:44 -0400
Branch: REL_10_STABLE [4985b3b84] 2020-04-24 17:21:44 -0400
Branch: REL9_6_STABLE [351252904] 2020-04-24 17:21:44 -0400
Branch: REL9_5_STABLE [3f3ab184c] 2020-04-24 17:21:44 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2020a for DST law changes in Morocco and the Canadian Yukon,
      plus historical corrections for Shanghai.
     </para>

     <para>
      The America/Godthab zone has been renamed to America/Nuuk to reflect
      current English usage; however, the old name remains available as a
      compatibility link.
     </para>

     <para>
      Also, update <application>initdb</application>'s list of known
      Windows time zone names to include recent additions, improving the
      odds that it will correctly translate the system time zone setting
      on that platform.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-2">
  <title>Release 12.2</title>

  <formalpara>
  <title>Release date:</title>
  <para>2020-02-13</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.1.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.2</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>

   <para>
    However, if you have any foreign key constraints referencing
    partitioned tables, see the two entries below about bugs in that
    feature.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [b048f558d] 2020-02-10 11:47:09 -0300
Branch: REL_12_STABLE [2ad125322] 2020-02-10 11:47:09 -0300
Branch: REL_11_STABLE [bdd19e48a] 2020-02-10 11:47:09 -0300
Branch: REL_10_STABLE [ac1a998ed] 2020-02-10 11:47:09 -0300
Branch: REL9_6_STABLE [e8b8eb937] 2020-02-10 12:06:25 -0300
-->
     <para>
      Add missing permissions checks for <command>ALTER ... DEPENDS ON
      EXTENSION</command> (&Aacute;lvaro Herrera)
     </para>

     <para>
      Marking an object as dependent on an extension did not have any
      privilege check whatsoever.  This oversight allowed any user to mark
      routines, triggers, materialized views, or indexes as droppable by
      anyone able to drop an extension.  Require that the calling user own
      the specified object (and hence have privilege to drop it).
      (CVE-2020-1720)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [9710d3d4a] 2020-02-07 17:09:36 -0300
Branch: REL_12_STABLE [ce054a8cd] 2020-02-07 17:09:36 -0300
-->
     <para>
      Fix <command>TRUNCATE ... CASCADE</command> to ensure all relevant
      partitions are truncated (Jehan-Guillaume de Rorthais)
     </para>

     <para>
      If a partition of a partitioned table is truncated with
      the <literal>CASCADE</literal> option, and the partitioned table has
      a foreign-key reference from another table, that table must also be
      truncated.  The need to check this was missed if the referencing
      table was itself partitioned, possibly allowing rows to survive that
      violate the foreign-key constraint.
     </para>

     <para>
      Hence, if you have foreign key constraints between partitioned
      tables, and you have done any
      partition-level <command>TRUNCATE</command> on the referenced table,
      you should check to see if any foreign key violations exist.  The
      simplest way is to add a new instance of the foreign key constraint
      (and, once that succeeds, drop it or the original constraint).
      That may be prohibitive from a locking standpoint, however, in which
      case you might prefer to manually query for unmatched rows.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [55173d2e6] 2020-02-07 18:27:18 -0300
Branch: REL_12_STABLE [2c80a656c] 2020-02-07 18:27:18 -0300
-->
     <para>
      Fix failure to attach foreign key constraints to sub-partitions
      (Jehan-Guillaume de Rorthais)
     </para>

     <para>
      When adding a partition to a level below the first level of a
      multi-level partitioned table, foreign key constraints referencing
      the top partitioned table were not cloned to the new partition,
      leading to possible constraint violations later.  Detaching and
      re-attaching the new partition is the cheapest way to fix this.
      However, if there are many partitions to be fixed, adding a new
      instance of the foreign key constraint might be preferable.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [01d9676a5] 2020-01-28 17:26:37 -0500
Branch: REL_12_STABLE [87fed2a19] 2020-01-28 17:26:37 -0500
-->
     <para>
      Fix possible crash during concurrent update on a partitioned table
      or inheritance tree (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [1fa846f1c] 2020-01-02 17:04:24 -0300
Branch: REL_12_STABLE [d73214839] 2020-01-02 17:04:24 -0300
Branch: REL_11_STABLE [adc9cb6f2] 2020-01-02 17:04:24 -0300
-->
     <para>
      Ensure that row triggers on partitioned tables are correctly
      cloned to sub-partitions when appropriate
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      User-defined triggers (but not triggers for foreign key or deferred
      unique constraints) might be missed when creating or attaching a
      partition.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [b9c130a1f] 2020-01-06 08:40:00 +0100
Branch: REL_12_STABLE [8c2bfd9f9] 2020-01-06 10:43:55 +0100
Branch: REL_11_STABLE [7474393e0] 2020-01-06 11:38:24 +0100
Branch: REL_10_STABLE [66fd0adc7] 2020-01-06 11:38:33 +0100
-->
     <para>
      Fix logical replication subscriber code to execute
      per-column <literal>UPDATE</literal> triggers when appropriate
      (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [d20703805] 2020-01-02 11:41:04 +0530
Branch: REL_12_STABLE [f8a6d8e71] 2020-01-02 11:53:53 +0530
Branch: REL_11_STABLE [3e3a79735] 2020-01-02 12:04:13 +0530
Branch: REL_10_STABLE [27b5f48c7] 2020-01-02 12:11:55 +0530
Branch: REL9_6_STABLE [ba5b4e506] 2020-01-02 11:29:50 +0530
Branch: REL9_5_STABLE [a6f4f407a] 2020-01-02 12:28:02 +0530
Branch: REL9_4_STABLE [1ad47e875] 2020-01-02 12:38:29 +0530
Branch: master [ed7bb5c31] 2020-01-14 07:53:50 +0530
Branch: REL_12_STABLE [fa1eaebfa] 2020-01-14 08:05:05 +0530
Branch: REL_11_STABLE [17869eca7] 2020-01-14 08:12:12 +0530
Branch: REL_10_STABLE [f9e95252a] 2020-01-14 08:20:11 +0530
-->
     <para>
      Avoid failure in logical decoding when a large transaction must be
      spilled into many separate temporary files (Amit Khandekar)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4d9ceb001] 2019-11-22 11:31:19 -0500
Branch: REL_12_STABLE [a2aa224e0] 2019-11-22 11:31:19 -0500
Branch: REL_11_STABLE [b72a44c51] 2019-11-22 11:31:19 -0500
Branch: REL_10_STABLE [5d3fcb53a] 2019-11-22 11:31:19 -0500
-->
     <para>
      Fix possible crash or data corruption when a logical replication
      subscriber processes a row update (Tom Lane, Tomas Vondra)
     </para>

     <para>
      This bug caused visible problems only if the subscriber's table
      contained columns that were not being copied from the publisher and
      had pass-by-reference data types.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [04c8a69c0] 2019-12-18 07:49:18 +0530
Branch: REL_12_STABLE [c74111d8b] 2019-12-18 07:57:01 +0530
Branch: REL_11_STABLE [046830164] 2019-12-18 08:16:31 +0530
Branch: REL_10_STABLE [d6eca4958] 2019-12-18 08:27:41 +0530
-->
     <para>
      Fix crash in logical replication subscriber after DDL changes on a
      subscribed relation (Jehan-Guillaume de Rorthais, Vignesh C)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [15cac3a52] 2020-01-17 18:00:39 -0300
Branch: REL_12_STABLE [bc2140627] 2020-01-17 18:00:39 -0300
Branch: REL_11_STABLE [fe955ebee] 2020-01-17 18:00:39 -0300
Branch: REL_10_STABLE [e3154aae3] 2020-01-17 18:00:39 -0300
Branch: REL9_6_STABLE [cdb14154b] 2020-01-17 18:00:39 -0300
Branch: REL9_5_STABLE [58997ace5] 2020-01-17 18:00:39 -0300
Branch: REL9_4_STABLE [20a1dc1e3] 2020-01-17 18:00:39 -0300
-->
     <para>
      Fix failure in logical replication publisher after a database crash
      and restart (Vignesh C)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [b0afdcad2] 2020-01-30 11:14:02 +0900
Branch: REL_12_STABLE [3228512b7] 2020-01-30 11:15:28 +0900
Branch: REL_11_STABLE [374464c3e] 2020-01-30 11:15:35 +0900
Branch: master [7ca8c9706] 2020-01-31 13:57:56 +0900
Branch: REL_12_STABLE [706ad6a4d] 2020-01-31 13:58:05 +0900
Branch: REL_11_STABLE [8b29c75f6] 2020-01-31 13:58:11 +0900
-->
     <para>
      Ensure that the effect
      of <function>pg_replication_slot_advance()</function> on a physical
      replication slot will persist across restarts (Alexey Kondratov,
      Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [1c7a0b387] 2020-02-03 18:59:12 -0300
Branch: REL_12_STABLE [42e3187a8] 2020-02-03 18:59:12 -0300
Branch: REL_11_STABLE [beefab654] 2020-02-03 18:59:12 -0300
Branch: REL_10_STABLE [380bc8829] 2020-02-03 18:59:12 -0300
-->
     <para>
      Improve efficiency of logical replication with <literal>REPLICA
      IDENTITY FULL</literal> (Konstantin Knizhnik)
     </para>

     <para>
      When searching for an existing tuple during an update or delete
      operation, return the first matching tuple not the last one.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [259bbe177] 2020-01-13 13:41:12 +0100
Branch: REL_12_STABLE [bf65f3c88] 2020-01-13 13:41:09 +0100
-->
     <para>
      Fix base backup to handle database OIDs larger
      than <literal>INT32_MAX</literal> (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [76cbfcdf3] 2019-11-16 10:11:30 +1300
Branch: REL_12_STABLE [24897e1a1] 2019-11-16 10:18:45 +1300
Branch: REL_11_STABLE [bc049d0d4] 2019-11-16 10:19:16 +1300
-->
     <para>
      Ensure parallel plans are always shut down at the correct time
      (Kyotaro Horiguchi)
     </para>

     <para>
      This oversight is known to result in <quote>temporary file
      leak</quote> warnings from multi-batch parallel hash joins.
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [080313f82] 2019-11-26 08:30:24 +0530
Branch: REL_12_STABLE [1cc3a90c7] 2019-11-26 08:55:06 +0530
Branch: REL_11_STABLE [d0ccfa9d6] 2019-11-26 09:07:35 +0530
Branch: REL_10_STABLE [f7ae68aac] 2019-11-26 09:23:45 +0530
Branch: REL9_6_STABLE [1ad0df67c] 2019-11-26 09:41:41 +0530
-->
     <para>
      Prevent premature shutdown of a Gather or GatherMerge plan node that
      is underneath a Limit node (Amit Kapila)
     </para>

     <para>
      This avoids failure if such a plan node needs to be scanned more
      than once, as for instance if it is on the inside of a nestloop.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [3e4818e9d] 2020-01-27 15:07:03 +1300
Branch: REL_12_STABLE [f9d0be241] 2020-01-27 14:11:24 +1300
Branch: REL_11_STABLE [6a9fc75d0] 2020-01-27 14:12:18 +1300
-->
     <para>
      Improve efficiency of parallel hash join on CPUs with many cores
      (Gang Deng, Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [74618e77b] 2020-01-31 10:25:34 +1300
Branch: REL_12_STABLE [1fcf62e0b] 2020-01-31 10:27:53 +1300
Branch: REL_11_STABLE [2c56b3ac4] 2020-01-31 11:12:21 +1300
Branch: master [d9fe702a2] 2020-02-05 12:27:00 +1300
Branch: REL_12_STABLE [2e2351bd6] 2020-02-05 12:28:33 +1300
Branch: REL_11_STABLE [c4a2041a4] 2020-02-05 12:30:06 +1300
-->
     <para>
      Avoid crash in parallel <command>CREATE INDEX</command> when there
      are no free dynamic shared memory slots (Thomas Munro)
     </para>

     <para>
      Fall back to a non-parallel index build, instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [93745f1e0] 2020-02-01 14:29:13 +1300
Branch: REL_12_STABLE [24dd34af1] 2020-02-01 14:49:57 +1300
Branch: REL_11_STABLE [600387f5d] 2020-02-01 22:57:46 +1300
Branch: REL_10_STABLE [aab30cd4e] 2020-02-01 14:54:48 +1300
Branch: REL9_6_STABLE [93be45245] 2020-02-01 14:57:40 +1300
Branch: REL9_5_STABLE [a5f45c3dd] 2020-02-01 14:59:58 +1300
Branch: REL9_4_STABLE [95936c795] 2020-02-01 15:10:20 +1300
-->
     <para>
      Avoid memory leak when there are no free dynamic shared memory slots
      (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [a904abe2e] 2020-01-22 09:49:18 +0900
Branch: REL_12_STABLE [817a1b88a] 2020-01-22 09:49:24 +0900
Branch: REL_11_STABLE [5b4b07fa9] 2020-01-22 09:49:28 +0900
Branch: REL_10_STABLE [9055344b4] 2020-01-22 09:49:33 +0900
Branch: REL9_6_STABLE [ef33edeb5] 2020-01-22 09:49:39 +0900
Branch: REL9_5_STABLE [c39f45598] 2020-01-22 09:49:44 +0900
Branch: REL9_4_STABLE [d76652edc] 2020-01-22 09:49:48 +0900
-->
     <para>
      Ignore the <literal>CONCURRENTLY</literal> option when performing an
      index creation, drop, or rebuild on a temporary table (Michael
      Paquier, Heikki Linnakangas, Andres Freund)
     </para>

     <para>
      This avoids strange failures if the temporary table has
      an <literal>ON COMMIT</literal> action.  There is no benefit in
      using <literal>CONCURRENTLY</literal> for a temporary table anyway,
      since other sessions cannot access the table, making the extra
      processing pointless.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c35b714ca] 2019-12-01 13:09:26 -0500
Branch: REL_12_STABLE [b154d70f7] 2019-12-01 13:09:26 -0500
Branch: REL_11_STABLE [768a401e2] 2019-12-01 13:09:26 -0500
Branch: REL_10_STABLE [25c7183c0] 2019-12-01 13:09:27 -0500
Branch: REL9_6_STABLE [283f095d0] 2019-12-01 13:09:27 -0500
Branch: REL9_5_STABLE [cfffa8a6b] 2019-12-01 13:09:27 -0500
Branch: REL9_4_STABLE [0c84e992c] 2019-12-01 13:09:27 -0500
-->
     <para>
      Fix possible failure when resetting expression indexes on temporary
      tables that are marked <literal>ON COMMIT DELETE ROWS</literal>
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [4c8701098] 2020-01-20 10:36:35 +0200
Branch: REL_12_STABLE [fd436bba0] 2020-01-20 10:36:45 +0200
Branch: REL_11_STABLE [da7abcf0f] 2020-01-20 10:36:47 +0200
Branch: REL_10_STABLE [ff0c567cb] 2020-01-20 10:36:50 +0200
Branch: REL9_6_STABLE [e96f30d89] 2020-01-20 10:36:52 +0200
Branch: REL9_5_STABLE [98f0d2837] 2020-01-20 10:36:55 +0200
-->
     <para>
      Fix possible crash in BRIN index operations
      with <type>box</type>, <type>range</type> and <type>inet</type> data
      types (Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [a7ee7c851] 2019-12-13 23:58:10 +0200
Branch: REL_12_STABLE [70c4f500e] 2019-12-13 23:59:00 +0200
Branch: master [741b88435] 2019-12-16 13:57:41 +0200
Branch: REL_12_STABLE [42d1acd2e] 2019-12-16 13:58:07 +0200
-->
     <para>
      Fix crash during recursive page split in GiST index build (Heikki
      Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
Branch: master [b10714080] 2019-11-20 00:12:33 +0300
Branch: REL_12_STABLE [a64e7e05a] 2019-11-20 00:17:58 +0300
Branch: REL_11_STABLE [7d467dee0] 2019-11-20 00:18:02 +0300
Branch: master [e14641197] 2019-11-20 00:04:09 +0300
Branch: REL_12_STABLE [051c50c01] 2019-11-20 00:04:53 +0300
Branch: REL_11_STABLE [9f2927989] 2019-11-20 00:05:12 +0300
Branch: REL_10_STABLE [21ad61ab3] 2019-11-20 00:05:35 +0300
Branch: master [d5ad7a09a] 2019-11-20 00:04:22 +0300
Branch: REL_12_STABLE [ee437ca74] 2019-11-20 00:05:01 +0300
Branch: REL_11_STABLE [c0bf35421] 2019-11-20 00:05:21 +0300
Branch: REL_10_STABLE [ab64b474d] 2019-11-20 00:05:42 +0300
Branch: REL9_6_STABLE [99f5888d3] 2019-11-19 23:47:29 +0300
Branch: REL9_5_STABLE [4fc485684] 2019-11-20 00:01:55 +0300
Branch: REL9_4_STABLE [1414821e1] 2019-11-20 00:03:04 +0300
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4093ff573] 2020-02-09 12:02:57 -0500
Branch: REL_12_STABLE [baf487123] 2020-02-09 12:02:57 -0500
Branch: REL_11_STABLE [f91706b00] 2020-02-09 12:02:57 -0500
-->
     <para>
      Fix handling of deleted pages in GIN indexes (Alexander Korotkov)
     </para>

     <para>
      Avoid possible deadlocks, incorrect updates of a deleted page's
      state, and failure to traverse through a recently-deleted page.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [41c6f9db2] 2020-01-17 16:17:31 -0500
Branch: REL_12_STABLE [2e2646060] 2020-01-17 16:17:32 -0500
Branch: REL_11_STABLE [d8e877b86] 2020-01-17 16:17:33 -0500
Branch: REL_10_STABLE [167fd022f] 2020-01-17 16:17:35 -0500
Branch: REL9_6_STABLE [45f03cfa5] 2020-01-17 16:17:36 -0500
Branch: REL9_5_STABLE [396472278] 2020-01-17 16:17:37 -0500
Branch: REL9_4_STABLE [eb9d1f050] 2020-01-17 16:17:39 -0500
-->
     <para>
      Fix possible crash with a SubPlan (sub-<literal>SELECT</literal>)
      within a multi-row <literal>VALUES</literal> list (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4ac8aaa36] 2020-01-08 09:42:53 -0500
Branch: REL_12_STABLE [c24f3b70e] 2020-01-08 09:42:53 -0500
-->
     <para>
      Fix failure in <command>ALTER TABLE</command> when a column
      referenced in a <literal>GENERATED</literal> expression has been
      added or changed in type earlier in the
      same <command>ALTER</command> command (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [bf6cc19e3] 2020-02-05 20:21:20 +0000
Branch: REL_12_STABLE [0e37489ed] 2020-02-05 20:08:11 +0000
Branch: REL_11_STABLE [d8f1c03a4] 2020-02-05 20:15:13 +0000
-->
     <para>
      Fix failure to insert default values for <quote>missing</quote>
      attributes during tuple conversion (Vik Fearing, Andrew Gierth)
     </para>

     <para>
      This could result in values incorrectly reading as NULL, when
      they come from columns that had been added by <literal>ALTER
      TABLE ADD COLUMN</literal> with a constant default.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [7bb3102ce] 2019-12-14 16:32:03 +1300
Branch: REL_12_STABLE [c3dc0cdd6] 2019-12-14 16:34:21 +1300
Branch: master [7c85be08a] 2019-12-14 18:35:58 +1300
Branch: REL_12_STABLE [fd005e1a8] 2019-12-14 19:03:44 +1300
-->
     <para>
      Fix unlikely panic in the checkpointer process, caused by opening
      relation segments that might already have been removed (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [38fc05607] 2020-01-10 18:31:22 -0800
Branch: REL_12_STABLE [93078e63f] 2020-01-10 18:31:25 -0800
Branch: REL_11_STABLE [2e86e154d] 2020-01-10 18:31:26 -0800
Branch: REL_10_STABLE [cb9774245] 2020-01-10 18:31:26 -0800
-->
     <para>
      Fix crash after FileClose() failure (Noah Misch)
     </para>

     <para>
      This issue could only be observed
      with <varname>data_sync_retry</varname> enabled, since otherwise
      FileClose() failure would be reported as a PANIC.
     </para>
    </listitem>

    <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
Branch: master [5a20b0219] 2019-12-10 18:00:30 +0900
Branch: REL_12_STABLE [547e454cb] 2019-12-10 18:00:31 +0900
-->
     <para>
      Fix handling of multiple <literal>AFTER ROW</literal> triggers on a
      foreign table (Etsuro Fujita)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [affdde2e1] 2020-01-20 23:26:51 -0800
Branch: REL_12_STABLE [21fdfd0e8] 2020-01-20 23:29:35 -0800
Branch: REL_11_STABLE [c8e0e560e] 2020-01-20 23:29:38 -0800
Branch: REL_10_STABLE [8bb006a41] 2020-01-20 23:30:47 -0800
Branch: REL9_6_STABLE [d4c339924] 2020-01-20 23:31:48 -0800
Branch: REL9_5_STABLE [f651976d9] 2020-01-20 23:31:52 -0800
Branch: REL9_4_STABLE [ba1dfbe22] 2020-01-20 23:32:21 -0800
-->
     <para>
      Fix unlikely crash with pass-by-reference aggregate transition
      states (Andres Freund, Teodor Sigaev)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4c70098ff] 2020-01-23 13:42:09 -0500
Branch: REL_12_STABLE [be13f227f] 2020-01-23 13:42:10 -0500
Branch: REL_11_STABLE [fb12aefaa] 2020-01-23 13:42:10 -0500
Branch: REL_10_STABLE [212b870d6] 2020-01-23 13:42:10 -0500
Branch: REL9_6_STABLE [9e24575f6] 2020-01-23 13:42:10 -0500
Branch: REL9_5_STABLE [a576f2a8f] 2020-01-23 13:42:10 -0500
Branch: REL9_4_STABLE [600b953d7] 2020-01-23 13:42:10 -0500
Branch: master [9a3a75cb8] 2020-01-23 16:15:32 -0500
Branch: REL_12_STABLE [f309c812e] 2020-01-23 16:15:32 -0500
Branch: REL_11_STABLE [7a9fef299] 2020-01-23 16:15:32 -0500
Branch: REL_10_STABLE [d6a9548b2] 2020-01-23 16:15:32 -0500
Branch: REL9_6_STABLE [451f50813] 2020-01-23 16:15:32 -0500
Branch: REL9_5_STABLE [0e63d9641] 2020-01-23 16:15:32 -0500
Branch: REL9_4_STABLE [8fc33e6cc] 2020-01-23 16:15:32 -0500
-->
     <para>
      Improve error reporting in <function>to_date()</function>
      and <function>to_timestamp()</function>
      (Tom Lane, &Aacute;lvaro Herrera)
     </para>

     <para>
      Reports about incorrect month or day names in input strings could
      truncate the input in the middle of a multi-byte character, leading
      to an improperly encoded error message that could cause follow-on
      failures.  Truncate at the next whitespace instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1a3efa1eb] 2019-12-12 12:30:43 -0500
Branch: REL_12_STABLE [07c4b6ac7] 2019-12-12 12:30:44 -0500
Branch: REL_11_STABLE [332584da9] 2019-12-12 12:30:44 -0500
Branch: REL_10_STABLE [c965c42a5] 2019-12-12 12:30:44 -0500
Branch: REL9_6_STABLE [6e2ac8d66] 2019-12-12 12:30:44 -0500
Branch: REL9_5_STABLE [323c47925] 2019-12-12 12:30:44 -0500
Branch: REL9_4_STABLE [6aa126311] 2019-12-12 12:30:44 -0500
-->
     <para>
      Fix off-by-one result for <literal>EXTRACT(ISOYEAR
      FROM <replaceable>timestamp</replaceable>)</literal> for BC dates
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d57d61533] 2019-11-13 15:53:53 -0500
Branch: REL_12_STABLE [5a6eea092] 2019-11-13 15:53:53 -0500
-->
     <para>
      Ensure that the <literal>&lt;&gt;</literal> operator for
      type <type>char</type> reports indeterminate-collation errors as
      such, rather than as <quote>cache lookup failed for collation
      0</quote> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [cb5b28613] 2020-02-07 22:06:31 +0900
Branch: REL_12_STABLE [598b466e8] 2020-02-07 22:07:44 +0900
Branch: REL_12_STABLE [4faea7fdf] 2020-02-08 12:29:38 +0900
-->
     <para>
      Avoid treating TID scans as sequential scans (Tatsuhito Kasahara)
     </para>

     <para>
      A refactoring oversight caused TID scans (selection by CTID) to be
      counted as sequential scans in the statistics views, and to take
      whole-table predicate locks as sequential scans do.  The latter
      behavior could cause unnecessary serialization errors in
      serializable transaction mode.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4a0aab14d] 2019-11-21 16:21:43 -0500
Branch: REL_12_STABLE [5186f7625] 2019-11-21 16:21:43 -0500
Branch: REL_11_STABLE [669138ebd] 2019-11-21 16:21:44 -0500
Branch: REL_10_STABLE [b9f3d7a53] 2019-11-21 16:21:44 -0500
Branch: REL9_6_STABLE [52434ba73] 2019-11-21 16:21:44 -0500
Branch: REL9_5_STABLE [bcd541897] 2019-11-21 16:21:44 -0500
Branch: REL9_4_STABLE [f09829017] 2019-11-21 16:21:44 -0500
-->
     <para>
      Avoid stack overflow in <literal>information_schema</literal> views
      when a self-referential view exists in the system catalogs
      (Tom Lane)
     </para>

     <para>
      A self-referential view can't work; it will always result in
      infinite recursion.  We handled that situation correctly when
      trying to execute the view, but not when inquiring whether it is
      automatically updatable.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [b175bd59f] 2020-01-07 17:38:48 -0300
Branch: REL_12_STABLE [fce9ba819] 2020-01-07 17:38:48 -0300
Branch: REL_11_STABLE [896db774e] 2020-01-07 17:38:48 -0300
Branch: REL_10_STABLE [8de3b68fa] 2020-01-07 17:55:21 -0300
Branch: master [f5d28710c] 2020-01-08 14:33:49 -0300
Branch: REL_12_STABLE [20c4df8c8] 2020-01-08 14:33:49 -0300
Branch: REL_11_STABLE [af43581e8] 2020-01-08 14:33:49 -0300
Branch: REL_10_STABLE [da42b9f3f] 2020-01-08 14:33:49 -0300
-->
     <para>
      Ensure that walsender processes always show NULL for transaction
      start time in <structname>pg_stat_activity</structname>
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      Previously, the <structfield>xact_start</structfield> column would
      sometimes show the process start time.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [e69d64454] 2019-12-24 13:05:43 +1300
Branch: REL_12_STABLE [8052aaf52] 2019-12-24 13:07:54 +1300
Branch: REL_11_STABLE [9e551a14c] 2019-12-24 13:09:56 +1300
Branch: REL_10_STABLE [8e89bc6df] 2019-12-24 13:11:13 +1300
Branch: REL9_6_STABLE [15861deb6] 2019-12-24 13:12:50 +1300
Branch: REL9_5_STABLE [893eaf0be] 2019-12-24 13:13:13 +1300
Branch: REL9_4_STABLE [5c0a132cf] 2019-12-24 13:13:30 +1300
-->
     <para>
      Improve performance of hash joins with very large inner relations
      (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e369f3708] 2020-01-06 16:42:20 -0500
Branch: REL_12_STABLE [b89845267] 2020-01-06 16:42:20 -0500
-->
     <para>
      Reduce spinlock contention when there are many active walsender
      processes (Pierre Ducroquet)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7d91b604d] 2020-02-04 13:07:13 -0500
Branch: REL_12_STABLE [9a85860e1] 2020-02-04 13:07:13 -0500
Branch: REL_11_STABLE [842a23efa] 2020-02-04 13:07:13 -0500
-->
     <para>
      Fix placement of <quote>Subplans Removed</quote> field
      in <command>EXPLAIN</command> output (Daniel Gustafsson, Tom Lane)
     </para>

     <para>
      In non-text output formats, this field was emitted inside
      the <quote>Plans</quote> sub-group, resulting in syntactically
      invalid output.  Attach it to the parent Append or MergeAppend plan
      node as intended.  This causes the field to change position in text
      output format too: if there are any InitPlans attached to the same
      plan node, <quote>Subplans Removed</quote> will now appear before
      those.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3ec20c709] 2020-01-26 16:32:19 -0500
Branch: REL_12_STABLE [bad494380] 2020-01-26 16:31:48 -0500
-->
     <para>
      Fix <command>EXPLAIN</command>'s <literal>SETTINGS</literal> option
      to print as empty in non-text output formats (Tom Lane)
     </para>

     <para>
      In the non-text output formats, fields are supposed to appear when
      requested, even if they have empty or zero values.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [553d2ec27] 2019-11-26 14:41:48 -0500
Branch: REL_12_STABLE [21a4edd12] 2019-11-26 14:41:48 -0500
Branch: REL_11_STABLE [1d9056f56] 2019-11-26 14:41:48 -0500
-->
     <para>
      Allow the planner to apply potentially-leaky tests to child-table
      statistics, if the user can read the corresponding column of the
      table that's actually named in the query (Dilip Kumar, Amit Langote)
     </para>

     <para>
      This change fixes a performance problem for partitioned tables that
      was created by the fix for CVE-2017-7484.  That security fix
      disallowed applying leaky operators to statistics for columns that
      the current user doesn't have permission to read directly.  However,
      it's somewhat common to grant permissions only on the parent
      partitioned table and not bother to do so on individual partitions.
      In such cases, the user can read the column via the parent, so
      there's no point in this security restriction; it only results in
      poorer planner estimates than necessary.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6ea364e7e] 2019-12-14 13:49:15 -0500
Branch: REL_12_STABLE [d04e2553d] 2019-12-14 13:49:15 -0500
-->
     <para>
      Fix planner errors induced by overly-aggressive collapsing of joins
      to single-row subqueries (Tom Lane)
     </para>

     <para>
      This mistake led to errors such as <quote>failed to construct the
      join relation</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b3c265d7b] 2019-11-19 17:03:34 -0500
Branch: REL_12_STABLE [bffe18e3e] 2019-11-19 17:03:35 -0500
-->
     <para>
      Fix <quote>no = operator for
      opfamily <replaceable>NNNN</replaceable></quote> planner error when
      trying to match a <literal>LIKE</literal> or regex pattern-match
      operator to a binary-compatible index opclass (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [652686a33] 2020-01-12 14:36:59 -0500
Branch: REL_12_STABLE [70c17a812] 2020-01-12 14:37:00 -0500
Branch: REL_11_STABLE [5832be6ca] 2020-01-12 14:37:00 -0500
Branch: REL_10_STABLE [8c8b456b5] 2020-01-12 14:37:00 -0500
Branch: REL9_6_STABLE [2dd10477c] 2020-01-12 14:37:00 -0500
Branch: REL9_5_STABLE [784c58da1] 2020-01-12 14:37:00 -0500
Branch: REL9_4_STABLE [6bd567b65] 2020-01-12 14:37:00 -0500
-->
     <para>
      Fix edge-case crashes and misestimations in selectivity calculations
      for the <literal>&lt;@</literal> and <literal>@&gt;</literal> range
      operators (Michael Paquier, Andrey Borodin, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [c676e659b] 2019-11-28 22:20:45 +0100
Branch: REL_12_STABLE [ef3fed2ce] 2019-11-28 22:26:25 +0100
Branch: master [6d61c3f1c] 2019-11-28 23:25:14 +0100
Branch: REL_12_STABLE [79d6e6afa] 2019-11-28 23:28:53 +0100
-->
     <para>
      Fix incorrect estimation for <literal>OR</literal> clauses when
      using most-common-value extended statistics (Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [d482f7f86] 2019-11-16 01:17:15 +0100
Branch: REL_12_STABLE [28555a53c] 2019-11-16 01:25:14 +0100
Branch: REL_11_STABLE [25a9ff6ca] 2019-11-16 01:58:38 +0100
Branch: REL_10_STABLE [0b0f281cc] 2019-11-16 01:42:20 +0100
-->
     <para>
      Ignore system columns when applying most-common-value
      extended statistics (Tomas Vondra)
     </para>

     <para>
      This prevents <quote>negative bitmapset member not allowed</quote>
      planner errors for affected queries.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [168d20640] 2019-11-21 10:23:28 +0900
Branch: REL_12_STABLE [c644407f7] 2019-11-21 10:23:38 +0900
Branch: REL_11_STABLE [62074a343] 2019-11-21 10:23:43 +0900
Branch: REL_10_STABLE [f4095026c] 2019-11-21 10:23:49 +0900
-->
     <para>
      Fix BRIN index logic to support hypothetical BRIN indexes
      (Julien Rouhaud, Heikki Linnakangas)
     </para>

     <para>
      Previously, if an <quote>index adviser</quote> extension tried to
      get the planner to produce a plan involving a hypothetical BRIN
      index, that would fail, because the BRIN cost estimation code would
      always try to physically access the index's metapage.  Now it checks
      to see if the index is only hypothetical, and uses default
      assumptions about the index parameters if so.
     </para>
    </listitem>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [d751ba523] 2020-01-14 09:52:21 +0000
Branch: REL_12_STABLE [fd5476b79] 2020-01-14 09:51:28 +0000
Branch: REL_11_STABLE [9bdb1f0e3] 2020-01-14 09:50:51 +0000
Branch: REL_10_STABLE [353cd826f] 2020-01-14 09:50:13 +0000
Branch: REL9_6_STABLE [fd87262de] 2020-01-14 09:49:23 +0000
Branch: REL9_5_STABLE [bb09a9414] 2020-01-14 09:48:44 +0000
Branch: REL9_4_STABLE [9be6fcb3e] 2020-01-14 09:47:44 +0000
-->
     <para>
      Improve error reporting for attempts to use automatic updating of
      views with conditional <literal>INSTEAD</literal> rules (Dean Rasheed)
     </para>

     <para>
      This has never been supported, but previously the error was thrown
      only at execution time, so that it could be masked by planner errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [fc7695891] 2019-12-23 12:08:23 -0500
Branch: REL_12_STABLE [976cb11f6] 2019-12-23 12:08:23 -0500
Branch: REL_11_STABLE [31dfa40a8] 2019-12-23 12:08:24 -0500
Branch: REL_10_STABLE [4af2531d0] 2019-12-23 12:08:24 -0500
Branch: REL9_6_STABLE [354d913f9] 2019-12-23 12:08:24 -0500
Branch: REL9_5_STABLE [6609c3ad9] 2019-12-23 12:08:24 -0500
Branch: REL9_4_STABLE [0d245d13c] 2019-12-23 12:08:24 -0500
Branch: master [74b35eb46] 2020-01-31 17:03:55 -0500
Branch: REL_12_STABLE [65aa15513] 2020-01-31 17:03:55 -0500
Branch: REL_11_STABLE [25dc267a1] 2020-01-31 17:03:55 -0500
Branch: REL_10_STABLE [de3d2df75] 2020-01-31 17:03:55 -0500
Branch: REL9_6_STABLE [742c646c1] 2020-01-31 17:03:55 -0500
Branch: REL9_5_STABLE [59047b6d0] 2020-01-31 17:03:55 -0500
Branch: REL9_4_STABLE [f521ef0ae] 2020-01-31 17:03:55 -0500
-->
     <para>
      Prevent a composite type from being included in itself indirectly
      via a range type (Tom Lane, Julien Rouhaud)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [39ebb943d] 2019-12-23 12:53:12 -0500
Branch: REL_12_STABLE [7fbb39a96] 2019-12-23 12:53:13 -0500
Branch: REL_11_STABLE [281dd22ac] 2019-12-23 12:53:13 -0500
Branch: REL_10_STABLE [ea1205a02] 2019-12-23 12:53:13 -0500
-->
     <para>
      Disallow partition key expressions that return pseudo-types, such
      as <type>record</type> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2acab054b] 2019-12-17 17:44:27 -0500
Branch: REL_12_STABLE [97ba30fab] 2019-12-17 17:44:28 -0500
Branch: REL_11_STABLE [fc449abc3] 2019-12-17 17:44:28 -0500
Branch: REL_10_STABLE [5c5a268c6] 2019-12-17 17:44:28 -0500
Branch: REL9_6_STABLE [275a8ac4f] 2019-12-17 17:44:28 -0500
Branch: REL9_5_STABLE [da5dd4218] 2019-12-17 17:44:28 -0500
Branch: REL9_4_STABLE [298d056d9] 2019-12-17 17:44:28 -0500
-->
     <para>
      Fix error reporting for index expressions of prohibited types
      (Amit Langote)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bf2efc55d] 2019-11-16 20:00:19 -0500
Branch: REL_12_STABLE [fcaf29d87] 2019-11-16 20:00:19 -0500
Branch: REL_11_STABLE [d898edf4f] 2019-11-16 20:00:19 -0500
Branch: REL_10_STABLE [a1b2cf095] 2019-11-16 20:00:19 -0500
Branch: REL9_6_STABLE [e4865bbdc] 2019-11-16 20:00:19 -0500
Branch: REL9_5_STABLE [ecb533af6] 2019-11-16 20:00:20 -0500
Branch: REL9_4_STABLE [65da6dd1d] 2019-11-16 20:00:20 -0500
-->
     <para>
      Fix dumping of views that contain only a <literal>VALUES</literal>
      list to handle cases where a view output column has been renamed
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2c7b5dad6] 2019-11-13 12:11:49 -0500
Branch: REL_12_STABLE [eec569fac] 2019-11-13 12:11:49 -0500
Branch: REL_11_STABLE [94a9cb43f] 2019-11-13 12:11:49 -0500
Branch: REL_10_STABLE [e25c4b3b2] 2019-11-13 12:11:50 -0500
-->
     <para>
      Ensure that data types and collations used
      in <literal>XMLTABLE</literal> constructs are accounted for when
      computing dependencies of a view or rule (Tom Lane)
     </para>

     <para>
      Previously it was possible to break a view
      using <literal>XMLTABLE</literal> by dropping a type, if the type
      was not otherwise referenced in the view.  This fix does not
      correct the dependencies already recorded for existing views, only
      for newly-created ones.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7618eaf5f] 2019-11-13 13:41:04 -0500
Branch: REL_12_STABLE [d9802590a] 2019-11-13 13:41:04 -0500
Branch: REL_11_STABLE [d66e68207] 2019-11-13 13:41:04 -0500
Branch: REL_10_STABLE [4be69e2ea] 2019-11-13 13:41:04 -0500
-->
     <para>
      Prevent unwanted downcasing and truncation of RADIUS authentication
      parameters (Marcos David)
     </para>

     <para>
      The <filename>pg_hba.conf</filename> parser mistakenly treated these
      fields as SQL identifiers, which in general they aren't.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [790026972] 2019-11-24 14:42:59 -0500
Branch: REL_12_STABLE [c47f498c9] 2019-11-24 14:42:59 -0500
Branch: REL_11_STABLE [377d1b95b] 2019-11-24 14:42:59 -0500
Branch: REL_10_STABLE [dbe15524b] 2019-11-24 14:42:59 -0500
Branch: REL9_6_STABLE [111298aa6] 2019-11-24 14:42:59 -0500
-->
     <para>
      Transmit incoming <command>NOTIFY</command> messages to the client
      before sending <literal>ReadyForQuery</literal>, rather than after
      (Tom Lane)
     </para>

     <para>
      This change ensures that, with libpq and other client libraries that
      act similarly to it, any notifications received during a transaction
      will be available by the time the client thinks the transaction is
      complete.  This probably makes no difference in practical
      applications (which would need to cope with asynchronous
      notifications in any case); but it makes it easier to build test
      cases with reproducible behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2c0cdc818] 2020-01-11 17:14:08 -0500
Branch: REL_12_STABLE [fde155424] 2020-01-11 17:14:08 -0500
-->
     <para>
      Fix bugs in handling of non-blocking I/O when using GSSAPI
      encryption (Tom Lane)
     </para>

     <para>
      These errors could result in dropping data (usually leading to
      subsequent wire-protocol-violation errors) or in
      a <quote>livelock</quote> situation where a sending process goes to
      sleep although not all its data has been sent.
      Moreover, <application>libpq</application> failed to keep separate
      encryption state for each connection, creating the possibility for
      failures in applications using multiple encrypted database
      connections.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e60b480d3] 2019-12-20 15:34:07 -0500
Branch: REL_12_STABLE [e8f60e6fe] 2019-12-20 15:34:07 -0500
Branch: REL_11_STABLE [1a77ea02d] 2019-12-20 15:34:08 -0500
Branch: REL_10_STABLE [d09cfa3e2] 2019-12-20 15:34:08 -0500
Branch: REL9_6_STABLE [c11bd6c10] 2019-12-20 15:34:08 -0500
Branch: REL9_5_STABLE [5e22a1111] 2019-12-20 15:34:08 -0500
Branch: REL9_4_STABLE [875c7d70d] 2019-12-20 15:34:08 -0500
-->
     <para>
      Allow <application>libpq</application> to parse all GSS-related
      connection parameters even when the GSSAPI code hasn't been compiled
      in (Tom Lane)
     </para>

     <para>
      This makes the behavior similar to our SSL support, where it was
      long ago deemed to be a good idea to always accept all the related
      parameters, even if some are ignored or restricted due to lack of
      the feature in a particular build.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [3ff660bbe] 2019-11-30 14:51:27 +0100
Branch: REL_12_STABLE [0dafed6fe] 2019-11-30 15:04:02 +0100
Branch: REL_11_STABLE [9668bf5d5] 2019-11-30 15:05:31 +0100
Branch: REL_10_STABLE [f71b22f53] 2019-11-30 15:07:47 +0100
Branch: REL9_6_STABLE [c59414da7] 2019-11-30 15:10:14 +0100
Branch: REL9_5_STABLE [a17602de1] 2019-11-30 15:14:12 +0100
Branch: REL9_4_STABLE [d9b974e99] 2019-11-30 15:16:58 +0100
-->
     <para>
      Fix incorrect handling of <literal>%b</literal>
      and <literal>%B</literal> format codes
      in <application>ecpg</application>'s
      <function>PGTYPEStimestamp_fmt_asc()</function> function
      (Tomas Vondra)
     </para>

     <para>
      Due to an off-by-one error, these codes would print the wrong month
      name, or possibly crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [44f1fc8df] 2020-01-19 19:15:15 -0500
Branch: REL_12_STABLE [c7c2cc670] 2020-01-19 19:15:15 -0500
-->
     <para>
      Avoid crash after an out-of-memory failure
      in <application>ecpglib</application> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2425f8f71] 2020-01-31 14:41:49 -0500
Branch: REL_12_STABLE [0c84199f7] 2020-01-31 14:41:49 -0500
Branch: REL_11_STABLE [63634883f] 2020-01-31 14:41:49 -0500
Branch: REL_10_STABLE [8b1d447a7] 2020-01-31 14:41:49 -0500
Branch: REL9_6_STABLE [cb4c04a4e] 2020-01-31 14:41:49 -0500
Branch: REL9_5_STABLE [1b78759a6] 2020-01-31 14:41:49 -0500
Branch: REL9_4_STABLE [5d60df830] 2020-01-31 14:41:49 -0500
-->
     <para>
      Fix
      parallel <application>pg_dump</application>/<application>pg_restore</application>
      to more gracefully handle failure to create worker processes
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cd23a2019] 2020-01-20 12:57:17 -0500
Branch: REL_12_STABLE [71b121f42] 2020-01-20 12:57:17 -0500
Branch: REL_11_STABLE [4ea5cf403] 2020-01-20 12:57:17 -0500
Branch: REL_10_STABLE [6f6daa1be] 2020-01-20 12:57:17 -0500
Branch: REL9_6_STABLE [208e262f9] 2020-01-20 12:57:17 -0500
Branch: REL9_5_STABLE [b1392a950] 2020-01-20 12:57:17 -0500
Branch: REL9_4_STABLE [42e538fe6] 2020-01-20 12:57:18 -0500
-->
     <para>
      Prevent possible crash or lockup when attempting to terminate a
      parallel <application>pg_dump</application>/<application>pg_restore</application>
      run via a signal (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [29aeda6e4] 2019-11-13 11:35:37 -0500
Branch: REL_12_STABLE [1cd57b05e] 2019-11-13 11:35:37 -0500
Branch: REL_11_STABLE [8e4ef3287] 2019-11-13 11:35:37 -0500
Branch: REL_10_STABLE [c443e3c43] 2019-11-13 11:35:37 -0500
Branch: REL9_6_STABLE [f378d4dac] 2019-11-13 11:35:37 -0500
Branch: REL9_5_STABLE [fb26754af] 2019-11-13 11:35:37 -0500
Branch: REL9_4_STABLE [56c06999d] 2019-11-13 11:35:37 -0500
-->
     <para>
      In <application>pg_upgrade</application>, look inside arrays and
      ranges while searching for non-upgradable data types in tables
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [8fa8e0115] 2020-02-10 12:14:58 -0300
Branch: REL_12_STABLE [87d014da9] 2020-02-10 12:14:58 -0300
Branch: REL_11_STABLE [ca902add6] 2020-02-10 12:14:58 -0300
Branch: REL_10_STABLE [163161723] 2020-02-10 12:14:58 -0300
Branch: REL9_6_STABLE [5575fc208] 2020-02-10 12:14:58 -0300
Branch: REL9_5_STABLE [1b2ae4bcd] 2020-02-10 12:16:40 -0300
Branch: REL9_4_STABLE [6f1e443a6] 2020-02-10 12:14:58 -0300
-->
     <para>
      Apply more thorough syntax checking
      to <application>createuser</application>'s
      <option>--connection-limit</option> option (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4ba4bfaf2] 2019-12-26 15:19:39 -0500
Branch: REL_12_STABLE [883c27a1c] 2019-12-26 15:19:39 -0500
Branch: REL_11_STABLE [ee206cb83] 2019-12-26 15:19:39 -0500
-->
     <para>
      Cope with changes of the specific type referenced by a PL/pgSQL
      composite-type variable in more cases (Ashutosh Sharma, Tom Lane)
     </para>

     <para>
      Dropping and re-creating the composite type referenced by a PL/pgSQL
      variable could lead to <quote>could not open relation with
      OID <replaceable>NNNN</replaceable></quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [215824f91] 2020-01-26 14:31:08 -0500
Branch: REL_12_STABLE [7294f99a0] 2020-01-26 14:31:08 -0500
Branch: REL_11_STABLE [5220ced0d] 2020-01-26 14:31:08 -0500
Branch: REL_10_STABLE [603e03b4c] 2020-01-26 14:31:08 -0500
Branch: REL9_6_STABLE [43a648f57] 2020-01-26 14:31:08 -0500
-->
     <para>
      Avoid crash in <filename>postgres_fdw</filename> when trying to
      send a command like <literal>UPDATE remote_tab SET (x,y) = (SELECT
      ...)</literal> to the remote server (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [b52739436] 2019-12-03 18:40:07 +0100
Branch: REL_12_STABLE [a8a8c6b29] 2019-12-03 18:40:48 +0100
Branch: REL_11_STABLE [267eb954c] 2019-12-03 18:41:29 +0100
Branch: REL_10_STABLE [46ce37b67] 2019-12-03 18:41:50 +0100
Branch: REL9_6_STABLE [fabdad822] 2019-12-03 18:42:25 +0100
Branch: REL9_5_STABLE [a2fdeb786] 2019-12-03 18:42:54 +0100
Branch: REL9_4_STABLE [44381b1af] 2019-12-03 18:43:15 +0100
-->
     <para>
      In <filename>contrib/dict_int</filename>,
      reject <varname>maxlen</varname> settings less than one
      (Tomas Vondra)
     </para>

     <para>
      This prevents a possible crash with silly settings for that parameter.
     </para>
    </listitem>

    <listitem>
<!--
Author: Joe Conway <mail@joeconway.com>
Branch: master [d5b9c2baf] 2019-12-23 13:33:25 -0500
Branch: REL_12_STABLE [b5e7569dd] 2019-12-23 13:33:34 -0500
Branch: REL_11_STABLE [f49e5efbc] 2019-12-23 13:33:42 -0500
Branch: REL_10_STABLE [81be0c57e] 2019-12-23 13:33:50 -0500
Branch: REL9_6_STABLE [3757c1640] 2019-12-23 13:33:57 -0500
Branch: REL9_5_STABLE [70fc6c4ef] 2019-12-23 13:34:05 -0500
Branch: REL9_4_STABLE [4a3cdb531] 2019-12-23 13:34:12 -0500
-->
     <para>
      Disallow NULL category values
      in <filename>contrib/tablefunc</filename>'s
      <function>crosstab()</function> function (Joe Conway)
     </para>

     <para>
      This case never worked usefully, and it would crash on some
      platforms.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [7d0bcb047] 2019-12-06 15:13:55 +0900
Branch: REL_12_STABLE [902276ff1] 2019-12-06 15:14:26 +0900
Branch: REL_11_STABLE [7ad544fd8] 2019-12-06 15:14:31 +0900
-->
     <para>
      Fix <application>configure</application>'s probe for
      OpenSSL's <function>SSL_clear_options()</function> function so that
      it works with OpenSSL versions before 1.1.0 (Michael Paquier, Daniel
      Gustafsson)
     </para>

     <para>
      This problem could lead to failure to set the SSL compression option
      as desired, when <productname>PostgreSQL</productname> is built against
      an old version of OpenSSL.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [62c9b5223] 2020-01-21 13:46:39 +0900
Branch: REL_12_STABLE [ef8e6b2c2] 2020-01-21 13:46:55 +0900
Branch: REL_11_STABLE [7c7026bb7] 2020-01-21 13:47:01 +0900
Branch: REL_10_STABLE [1ef7332b7] 2020-01-21 13:47:05 +0900
Branch: REL9_6_STABLE [9740cdbe5] 2020-01-21 13:47:10 +0900
Branch: REL9_5_STABLE [4a49149b9] 2020-01-21 13:47:13 +0900
Branch: REL9_4_STABLE [dbe405b78] 2020-01-21 13:47:17 +0900
-->
     <para>
      Mark some timeout and statistics-tracking GUC variables
      as <literal>PGDLLIMPORT</literal>, to allow extensions to access
      them on Windows (Pascal Legrand)
     </para>

     <para>
      This applies to
      <literal>idle_in_transaction_session_timeout</literal>,
      <literal>lock_timeout</literal>,
      <literal>statement_timeout</literal>,
      <literal>track_activities</literal>,
      <literal>track_counts</literal>, and
      <literal>track_functions</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [543852fd8] 2020-01-17 15:29:11 +0100
Branch: REL_12_STABLE [162c951df] 2020-01-17 15:30:51 +0100
Branch: REL_11_STABLE [8c37e4469] 2020-01-17 15:31:33 +0100
Branch: REL_10_STABLE [a801452c9] 2020-01-17 15:32:03 +0100
-->
     <para>
      Avoid memory leak in sanity checks for <quote>slab</quote> memory
      contexts (Tomas Vondra)
     </para>

     <para>
      This isn't an issue for production builds, since they wouldn't
      ordinarily have memory context checking enabled; but the leak could
      be quite severe in a debug build.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [3ccc66dac] 2020-02-06 14:43:21 +0900
Branch: REL_12_STABLE [3d214a8e5] 2020-02-06 14:44:22 +0900
Branch: REL_11_STABLE [ac25e1044] 2020-02-06 14:44:40 +0900
Branch: REL_10_STABLE [c17abac60] 2020-02-06 14:44:59 +0900
-->
     <para>
      Fix multiple statistics entries reported by the LWLock statistics
      mechanism (Fujii Masao)
     </para>

     <para>
      The LWLock statistics code (which is not built by default; it
      requires compiling with <option>-DLWLOCK_STATS</option>)
      could report multiple entries for the same LWLock and backend
      process, as a result of faulty hashtable key creation.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [28e6a2fd6] 2019-12-09 15:03:51 -0500
Branch: REL_12_STABLE [001362cfd] 2019-12-09 15:03:51 -0500
Branch: REL_11_STABLE [2ed302ab9] 2019-12-09 15:03:51 -0500
Branch: REL_10_STABLE [096ea540e] 2019-12-09 15:03:52 -0500
Branch: REL9_6_STABLE [df44e411c] 2019-12-09 15:03:52 -0500
Branch: REL9_5_STABLE [1a0c65120] 2019-12-09 15:03:52 -0500
Branch: REL9_4_STABLE [7309e75fa] 2019-12-09 15:03:52 -0500
-->
     <para>
      Fix race condition that led to delayed delivery of interprocess
      signals on Windows (Amit Kapila)
     </para>

     <para>
      This caused visible timing oddities in <command>NOTIFY</command>,
      and perhaps other misbehavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [6969deeb8] 2019-11-20 18:29:37 +1300
Branch: REL_12_STABLE [2189f49c4] 2019-11-20 18:30:56 +1300
-->
     <para>
      Fix handling of a corner-case error result from
      Windows' <function>ReadFile()</function> function
      (Thomas Munro, Juan Jos&eacute; Santamar&iacute;a Flecha)
     </para>

     <para>
      So far as is known, this oversight just resulted in noisy log
      messages, not any actual query misbehavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6d7547c21] 2019-12-16 15:10:55 -0500
Branch: REL_12_STABLE [95f43fee9] 2019-12-16 15:10:55 -0500
Branch: REL_11_STABLE [2cf51809b] 2019-12-16 15:10:55 -0500
Branch: REL_10_STABLE [81b052c31] 2019-12-16 15:10:55 -0500
Branch: REL9_6_STABLE [65cb25e4f] 2019-12-16 15:10:55 -0500
Branch: REL9_5_STABLE [cd0380351] 2019-12-16 15:10:55 -0500
Branch: REL9_4_STABLE [cfb2a4cce] 2019-12-16 15:10:56 -0500
Branch: master [5406513e9] 2019-12-21 17:39:36 -0500
Branch: REL_12_STABLE [90281a3a2] 2019-12-21 17:39:36 -0500
Branch: REL_11_STABLE [b3c4e2418] 2019-12-21 17:39:36 -0500
Branch: REL_10_STABLE [a69f5697a] 2019-12-21 17:39:36 -0500
Branch: REL9_6_STABLE [739201b0e] 2019-12-21 17:39:36 -0500
Branch: REL9_5_STABLE [35b28d983] 2019-12-21 17:39:37 -0500
Branch: REL9_4_STABLE [f1a4020ef] 2019-12-21 17:39:37 -0500
-->
     <para>
      On Windows, retry a few times after
      an <literal>ERROR_ACCESS_DENIED</literal> file access failure
      (Alexander Lakhin, Tom Lane)
     </para>

     <para>
      This helps cope with cases where a file open attempt fails because
      the targeted file is flagged for deletion but not yet actually gone.
      <application>pg_ctl</application>, for example, frequently failed
      with such an error when probing to see if the postmaster had shut
      down yet.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0da33c762] 2019-12-10 13:17:08 -0500
Branch: REL_12_STABLE [be9d4b928] 2019-12-10 13:17:08 -0500
-->
     <para>
      On Windows, work around sharing violations for the postmaster's log
      file when <application>pg_ctl</application> is used to start the
      postmaster very shortly after it's been stopped, for example by
      <literal>pg_ctl restart</literal> (Alexander Lakhin)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12-1">
  <title>Release 12.1</title>

  <formalpara>
  <title>Release date:</title>
  <para>2019-11-14</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 12.0.
   For information about new features in major release 12, see
   <xref linkend="release-12"/>.
  </para>

  <sect2>
   <title>Migration to Version 12.1</title>

   <para>
    A dump/restore is not required for those running 12.X.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [93765bd95] 2019-10-09 22:00:50 -0700
Branch: REL_12_STABLE [f224c7c11] 2019-10-09 22:13:48 -0700
Branch: master [ae5cae54c] 2019-10-16 02:37:34 -0700
Branch: REL_12_STABLE [3b25de620] 2019-10-16 02:38:13 -0700
-->
     <para>
      Fix crash when <command>ALTER TABLE</command> adds a column without
      a default value along with making other changes that require a table
      rewrite (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [5d3500da7] 2019-10-23 15:04:48 +0900
Branch: REL_12_STABLE [7668d4847] 2019-10-23 15:05:09 +0900
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [8270a0d9a] 2019-10-25 10:20:08 +0900
Branch: REL_12_STABLE [7f84b0ef0] 2019-10-25 10:20:16 +0900
-->
     <para>
      Fix lock handling in <command>REINDEX CONCURRENTLY</command>
      (Michael Paquier)
     </para>

     <para>
      <command>REINDEX CONCURRENTLY</command> neglected to take a
      session-level lock on the new index version, potentially allowing
      other sessions to manipulate it too soon.
      Also, a query-cancel or session-termination interrupt arriving at the
      wrong time could result in failure to release the session-level
      locks that <command>REINDEX CONCURRENTLY</command> does hold.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [0d21f919e] 2019-10-16 14:51:34 +0200
Branch: REL_12_STABLE [1cd5bc3cc] 2019-10-16 14:51:23 +0200
-->
     <para>
      Avoid crash due to race condition when reporting the progress of
      a <command>CREATE INDEX CONCURRENTLY</command> or <command>REINDEX
      CONCURRENTLY</command> command (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [68ac9cf24] 2019-10-28 11:57:31 +0900
Branch: REL_12_STABLE [5e5f32284] 2019-10-28 11:58:29 +0900
-->
     <para>
      Avoid creating duplicate dependency entries during <command>REINDEX
      CONCURRENTLY</command> (Michael Paquier)
     </para>

     <para>
      This bug resulted in bloat in <structname>pg_depend</structname>,
      but no worse consequences than that.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [6bda2af03] 2019-10-17 09:59:21 +1300
Branch: REL_12_STABLE [486a8f152] 2019-10-17 11:08:49 +1300
Branch: REL_11_STABLE [6f1e336de] 2019-10-17 11:01:35 +1300
Branch: REL_10_STABLE [583d86f92] 2019-10-17 10:55:26 +1300
Branch: REL9_6_STABLE [0640f032a] 2019-10-17 11:57:33 +1300
Branch: REL9_5_STABLE [c1443eebe] 2019-10-17 10:28:28 +1300
Branch: REL9_4_STABLE [080cf32d2] 2019-10-17 10:14:51 +1300
-->
     <para>
      Prevent <command>VACUUM</command> from trying to freeze
      an old multixact ID involving a still-running transaction
      (Nathan Bossart, Jeremy Schneider)
     </para>

     <para>
      This case would lead to <command>VACUUM</command> failing until the
      old transaction terminates.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [cef82eda1] 2019-10-15 10:40:13 -0700
Branch: REL_12_STABLE [6d3fe6b6b] 2019-10-15 10:40:51 -0700
-->
     <para>
      Fix <quote>wrong type of slot</quote> error when trying
      to <command>CLUSTER</command> on an expression index (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [b4bcc6bfd] 2019-11-07 13:59:24 -0300
Branch: REL_12_STABLE [b75ccddcd] 2019-11-07 13:59:24 -0300
Branch: REL_11_STABLE [e4baecf1e] 2019-11-07 14:26:10 -0300
-->
     <para>
      <command>SET CONSTRAINTS ... DEFERRED</command> failed on
      partitioned tables, incorrectly complaining about lack of triggers
      (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [dc816e581] 2019-11-02 14:16:04 +0900
Branch: REL_12_STABLE [7963c4c4b] 2019-11-02 14:16:11 +0900
Branch: REL_11_STABLE [f10815c5b] 2019-11-02 14:17:12 +0900
-->
     <para>
      Fix failure when creating indexes for a partition, if the parent
      partitioned table contains any dropped columns (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [1df5875d3] 2019-10-13 17:51:55 +0900
Branch: REL_12_STABLE [3a58c5f14] 2019-10-13 17:53:08 +0900
Branch: master [14ac4237c] 2019-10-14 08:58:38 +0900
Branch: REL_12_STABLE [9fd9af97f] 2019-10-14 08:58:47 +0900
-->
     <para>
      Fix dropping of indexed columns in partitioned tables
      (Amit Langote, Michael Paquier)
     </para>

     <para>
      Previously this might fail with an error message complaining about
      the dependencies of the indexes.  It should automatically drop the
      indexes, instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [d80be6f2f] 2019-10-29 11:08:09 +0900
Branch: REL_12_STABLE [eae1ba65f] 2019-10-29 11:08:16 +0900
-->
     <para>
      Ensure that a partition index can be dropped after a failure to
      reindex it concurrently (Michael Paquier)
     </para>

     <para>
      The
      index's <structname>pg_class</structname>.<structfield>relispartition</structfield>
      flag was left in the wrong state in such a case,
      causing <command>DROP INDEX</command> to fail.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [529ebb20a] 2019-11-05 11:42:24 -0500
Branch: REL_12_STABLE [a9db37a18] 2019-11-05 11:42:25 -0500
-->
     <para>
      Fix handling of equivalence class members for partition-wise joins
      (Amit Langote)
     </para>

     <para>
      This oversight could lead either to failure to use a feasible
      partition-wise join plan, or to a <quote>could not find pathkey item
      to sort</quote> planner failure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [b7a1c5539] 2019-10-03 10:54:52 +0100
Branch: REL_12_STABLE [0b11dc019] 2019-10-03 11:12:39 +0100
Branch: REL_11_STABLE [0a445f279] 2019-10-03 11:14:30 +0100
Branch: REL_10_STABLE [ede0ab6cc] 2019-10-03 11:15:38 +0100
Branch: REL9_6_STABLE [6db0d7f35] 2019-10-03 11:17:38 +0100
Branch: REL9_5_STABLE [d2427f11b] 2019-10-03 11:18:15 +0100
Branch: REL9_4_STABLE [3473f81dd] 2019-10-03 11:18:20 +0100
-->
     <para>
      Ensure that offset expressions in <literal>WINDOW</literal> clauses
      are processed when a query's expressions are manipulated (Andrew Gierth)
     </para>

     <para>
      This oversight could result in assorted failures when the offsets
      are nontrivial expressions.  One example is that a function
      parameter reference in such an expression would fail if the function
      was inlined.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3887e9455] 2019-10-07 12:39:09 -0400
Branch: REL_12_STABLE [7e8d0eb63] 2019-10-07 12:39:09 -0400
Branch: REL_11_STABLE [021065aac] 2019-10-07 12:39:09 -0400
Branch: REL_10_STABLE [1b5c2ddcd] 2019-10-07 12:39:09 -0400
Branch: REL9_6_STABLE [c69e982a6] 2019-10-07 12:39:09 -0400
Branch: REL9_5_STABLE [8c2910ce5] 2019-10-07 12:39:10 -0400
-->
     <para>
      Avoid postmaster failure if a parallel query requests a background
      worker when no postmaster child process array slots remain free
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [d986d4e87] 2019-10-04 13:50:49 -0700
Branch: REL_12_STABLE [60e97d63e] 2019-10-04 13:57:37 -0700
-->
     <para>
      Fix crash triggered by an EvalPlanQual recheck on a table with
      a <literal>BEFORE UPDATE</literal> trigger (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a30531c5c] 2019-11-05 13:40:37 -0500
Branch: REL_12_STABLE [791864193] 2019-11-05 13:40:37 -0500
Branch: REL_11_STABLE [2bfe015b5] 2019-11-05 13:40:37 -0500
-->
     <para>
      Fix <quote>unexpected relkind</quote> error when a query tries to
      access a TOAST table (John Hsu, Michael Paquier, Tom Lane)
     </para>

     <para>
      The error should say that permission is denied, but this case got
      broken during code refactoring.
     </para>
    </listitem>

    <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
Branch: master [3c8c55dd5] 2019-10-17 13:47:01 +1300
Branch: REL_12_STABLE [3af7c64fe] 2019-10-17 14:00:15 +1300
Branch: REL_11_STABLE [6737111a7] 2019-10-17 13:58:58 +1300
Branch: REL_10_STABLE [89a3cdb32] 2019-10-17 13:57:23 +1300
Branch: REL9_6_STABLE [fd5ffa425] 2019-10-17 13:52:59 +1300
Branch: REL9_5_STABLE [cdbb39213] 2019-10-17 13:50:59 +1300
-->
     <para>
      Provide a relevant error context line when an error occurs while
      setting GUC parameters during parallel worker startup (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [a586cc4b6] 2019-10-04 13:34:28 -0700
Branch: REL_12_STABLE [c025165da] 2019-10-04 13:34:39 -0700
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [b8e19b932] 2019-10-09 13:30:43 +0900
Branch: REL_12_STABLE [07c314968] 2019-10-09 13:31:13 +0900
Branch: REL_11_STABLE [e34358c43] 2019-10-09 13:31:17 +0900
Branch: REL_10_STABLE [fbfc835b4] 2019-10-09 13:31:22 +0900
Branch: REL9_6_STABLE [4e7a8874a] 2019-10-09 13:31:27 +0900
Branch: REL9_5_STABLE [c50f95272] 2019-10-09 13:31:33 +0900
Branch: REL9_4_STABLE [59800f7ce] 2019-10-09 13:31:38 +0900
-->
     <para>
      Ensure that <function>fsync()</function> is applied only to files
      that are opened read/write (Andres Freund, Michael Paquier)
     </para>

     <para>
      Some code paths tried to do this after opening a file read-only,
      but on some platforms that causes <quote>bad file descriptor</quote>
      or similar errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8e10405c7] 2019-10-03 17:34:25 -0400
Branch: REL_12_STABLE [8381242df] 2019-10-03 17:34:25 -0400
Branch: REL_11_STABLE [e5ff97571] 2019-10-03 17:34:25 -0400
Branch: REL_10_STABLE [226551e7c] 2019-10-03 17:34:26 -0400
Branch: REL9_6_STABLE [677989cc0] 2019-10-03 17:34:26 -0400
Branch: REL9_5_STABLE [54d641da0] 2019-10-03 17:34:26 -0400
Branch: REL9_4_STABLE [6899be289] 2019-10-03 17:34:26 -0400
-->
     <para>
      Allow encoding conversion to succeed on longer strings than before
      (&Aacute;lvaro Herrera, Tom Lane)
     </para>

     <para>
      Previously, there was a hard limit of 0.25GB on the input string,
      but now it will work as long as the converted output is not over 1GB.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: master [a9056cc63] 2019-11-06 04:13:30 +0000
Branch: REL_12_STABLE [f57c63107] 2019-11-06 04:33:35 +0000
Branch: REL_11_STABLE [be99485b9] 2019-11-06 04:33:42 +0000
Branch: REL_10_STABLE [6da5310e8] 2019-11-06 04:33:49 +0000
Branch: REL9_6_STABLE [747aac88f] 2019-11-06 04:33:55 +0000
-->
     <para>
      Avoid creating unnecessarily-bulky tuple stores for window functions
      (Andrew Gierth)
     </para>

     <para>
      In some cases the tuple storage would include all columns of the
      source table(s), not just the ones that are needed by the query.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c477f3e44] 2019-10-03 13:56:26 -0400
Branch: REL_12_STABLE [9a407209a] 2019-10-03 13:56:26 -0400
Branch: REL_11_STABLE [82d0a46ea] 2019-10-03 13:56:26 -0400
Branch: REL_10_STABLE [9ad1b572d] 2019-10-03 13:56:26 -0400
Branch: REL9_6_STABLE [e5e4f12a5] 2019-10-03 13:56:26 -0400
Branch: REL9_5_STABLE [1534531fe] 2019-10-03 13:56:26 -0400
Branch: REL9_4_STABLE [4829576ba] 2019-10-03 13:56:27 -0400
-->
     <para>
      Allow <function>repalloc()</function> to give back space when a
      large chunk is reduced in size (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [df86e52ca] 2019-10-02 15:53:07 +0900
Branch: REL_12_STABLE [2a724cdbf] 2019-10-02 15:53:51 +0900
Branch: REL_11_STABLE [b978de0eb] 2019-10-02 15:53:56 +0900
Branch: REL_10_STABLE [7ca35472c] 2019-10-02 15:54:01 +0900
Branch: REL9_6_STABLE [ac1efdd08] 2019-10-02 15:54:11 +0900
Branch: REL9_5_STABLE [ae205dfe6] 2019-10-02 15:54:16 +0900
-->
     <para>
      Ensure that temporary WAL and history files are removed at the end
      of archive recovery (Sawada Masahiko)
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [ec1259e88] 2019-10-18 22:32:18 +0900
Branch: REL_12_STABLE [9dfbf9a04] 2019-10-18 22:34:05 +0900
Branch: REL_11_STABLE [f7b70700b] 2019-10-18 22:35:07 +0900
Branch: REL_10_STABLE [c455ee88c] 2019-10-18 22:35:19 +0900
Branch: REL9_6_STABLE [579996bc2] 2019-10-18 22:35:30 +0900
Branch: REL9_5_STABLE [1b2ba8874] 2019-10-18 22:35:41 +0900
Branch: REL9_4_STABLE [14c59185b] 2019-10-18 22:35:52 +0900
-->
     <para>
      Avoid failure in archive recovery
      if <varname>recovery_min_apply_delay</varname> is enabled
      (Fujii Masao)
     </para>

     <para>
      <varname>recovery_min_apply_delay</varname> is not typically used in
      this configuration, but it should work.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [20961ceaf] 2019-10-11 15:47:59 +0900
Branch: REL_12_STABLE [fcf7f8d92] 2019-10-11 15:49:32 +0900
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [9b95a36be] 2019-10-18 22:24:18 +0900
Branch: REL_12_STABLE [03666dfa1] 2019-10-18 22:25:42 +0900
-->
     <para>
      Ignore <varname>restore_command</varname>,
      <varname>recovery_end_command</varname>,
      and <varname>recovery_min_apply_delay</varname> settings during
      crash recovery (Fujii Masao)
     </para>

     <para>
      Now that these settings can be specified
      in <filename>postgresql.conf</filename>, they could be turned on
      during crash recovery, but honoring them then is undesirable.
      Ignore these settings until crash recovery is complete.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
Branch: master [1c60e40ad] 2019-11-09 08:35:44 +0100
Branch: REL_12_STABLE [d891d2c89] 2019-11-09 08:35:51 +0100
Branch: REL_11_STABLE [7961da188] 2019-11-09 08:36:11 +0100
Branch: REL_10_STABLE [2e00d5976] 2019-11-09 09:15:35 +0100
Branch: master [ef8fcbff5] 2019-11-09 13:19:27 +0100
Branch: REL_12_STABLE [f96756304] 2019-11-09 16:00:34 +0100
Branch: REL_11_STABLE [aa9884578] 2019-11-09 16:01:23 +0100
Branch: REL_10_STABLE [806f9dc02] 2019-11-09 16:03:00 +0100
-->
     <para>
      Fix logical replication failure when publisher and subscriber have
      different ideas about a table's replica identity columns
      (Jehan-Guillaume de Rorthais, Peter Eisentraut)
     </para>

     <para>
      Declaring a column as part of the replica identity on the
      subscriber, when it does not exist at all on the publisher, led
      to <quote>negative bitmapset member not allowed</quote> errors.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [38ddeab13] 2019-10-17 15:06:06 +0200
Branch: REL_12_STABLE [1391c13ce] 2019-10-17 15:06:06 +0200
Branch: REL_11_STABLE [45e4067c0] 2019-10-17 15:06:05 +0200
Branch: REL_10_STABLE [0d9fcbada] 2019-10-17 15:06:05 +0200
Branch: REL9_6_STABLE [5f038991e] 2019-10-17 15:06:05 +0200
Branch: REL9_5_STABLE [b2ab06e02] 2019-10-17 15:06:05 +0200
Branch: REL9_4_STABLE [abd5071d2] 2019-10-17 15:06:05 +0200
-->
     <para>
      Avoid unwanted delay during shutdown of a logical replication
      walsender (Craig Ringer, &Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [3f60f690f] 2019-10-18 14:26:29 +0900
Branch: REL_12_STABLE [04510dbe3] 2019-10-18 14:26:53 +0900
Branch: REL_11_STABLE [feed5ee47] 2019-10-18 14:27:00 +0900
Branch: REL_10_STABLE [47698b4b6] 2019-10-18 14:27:04 +0900
-->
     <para>
      Fix timeout handling in logical replication walreceiver processes
      (Julien Rouhaud)
     </para>

     <para>
      Erroneous logic prevented <varname>wal_receiver_timeout</varname>
      from working in logical replication deployments.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [5f6b1eb0c] 2019-11-06 16:12:21 +0900
Branch: REL_12_STABLE [9ae4bdadf] 2019-11-06 16:12:28 +0900
Branch: REL_11_STABLE [cb6d7f985] 2019-11-06 16:12:34 +0900
Branch: REL_10_STABLE [f7b0d0704] 2019-11-06 16:12:40 +0900
Branch: REL9_6_STABLE [16b43e091] 2019-11-06 16:12:47 +0900
Branch: REL9_5_STABLE [404d25f3c] 2019-11-06 16:12:51 +0900
Branch: REL9_4_STABLE [15d90a02a] 2019-11-06 16:12:56 +0900
-->
     <para>
      Correctly time-stamp replication messages for logical
      decoding (Jeff Janes)
     </para>

     <para>
      This oversight resulted, for example,
      in <structname>pg_stat_subscription</structname>.<structfield>last_msg_send_time</structfield>
      usually reading as NULL.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [20345197f] 2019-11-01 22:38:32 +0900
Branch: REL_12_STABLE [7b8c2de64] 2019-11-01 22:38:45 +0900
Branch: REL_11_STABLE [61f238392] 2019-11-01 22:38:51 +0900
Branch: REL_10_STABLE [b99bfc3c9] 2019-11-01 22:38:55 +0900
Branch: REL9_6_STABLE [52684bc7d] 2019-11-01 22:39:01 +0900
Branch: REL9_5_STABLE [0927d0c25] 2019-11-01 22:39:05 +0900
Branch: REL9_4_STABLE [f88f7206e] 2019-11-01 22:39:09 +0900
-->
     <para>
      Fix race condition during backend exit, when the backend process has
      previously waited for synchronous replication to occur (Dongming Liu)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3affe76ef] 2019-11-05 14:27:37 -0500
Branch: REL_12_STABLE [f9bd3b6d9] 2019-11-05 14:27:37 -0500
Branch: REL_11_STABLE [97ddc47b9] 2019-11-05 14:27:37 -0500
Branch: REL_10_STABLE [0238a5028] 2019-11-05 14:27:37 -0500
Branch: REL9_6_STABLE [383602f9a] 2019-11-05 14:27:37 -0500
Branch: REL9_5_STABLE [970372037] 2019-11-05 14:27:37 -0500
Branch: REL9_4_STABLE [762b25653] 2019-11-05 14:27:38 -0500
-->
     <para>
      Avoid logging complaints about abandoned connections when using PAM
      authentication (Tom Lane)
     </para>

     <para>
      libpq-based clients will typically make two connection attempts when
      a password is required, since they don't prompt their user for a
      password until their first connection attempt fails.  Therefore the
      server is coded not to generate useless log spam when a client
      closes the connection upon being asked for a password.  However,
      the PAM authentication code hadn't gotten that memo, and would
      generate several messages about a phantom authentication failure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5ac0d9360] 2019-09-22 17:45:59 -0400
Branch: REL_12_STABLE Release: REL_12_0 [860216efa] 2019-09-22 17:46:00 -0400
Branch: REL_11_STABLE [7e7abed05] 2019-09-22 17:46:00 -0400
Branch: REL_10_STABLE [096d34c3b] 2019-09-22 17:46:00 -0400
Branch: REL9_6_STABLE [6ddd164aa] 2019-09-22 17:46:00 -0400
Branch: REL9_5_STABLE [35eb13270] 2019-09-22 17:46:00 -0400
Branch: REL9_4_STABLE [8a17afe84] 2019-09-22 17:46:00 -0400
Branch: master [61aa9f544] 2019-10-04 10:34:40 -0400
Branch: REL_12_STABLE [6c3b6406d] 2019-10-04 10:34:21 -0400
Branch: REL_11_STABLE [b8ddf0bdf] 2019-10-04 10:34:21 -0400
Branch: REL_10_STABLE [9faa9794f] 2019-10-04 10:34:21 -0400
Branch: REL9_6_STABLE [30e5b3bbe] 2019-10-04 10:34:21 -0400
Branch: REL9_5_STABLE [8b77f783b] 2019-10-04 10:34:21 -0400
Branch: REL9_4_STABLE [b6a6c129f] 2019-10-04 10:34:21 -0400
-->
     <para>
      Fix misbehavior of <function>bitshiftright()</function> (Tom Lane)
     </para>

     <para>
      The bitstring right shift operator failed to zero out padding space
      that exists in the last byte of the result when the bitstring length
      is not a multiple of 8.  While invisible to most operations, any
      nonzero bits there would result in unexpected comparison behavior,
      since bitstring comparisons don't bother to ignore the extra bits,
      expecting them to always be zero.
     </para>

     <para>
      If you have inconsistent data as a result of saving the output
      of <function>bitshiftright()</function> in a table, it's possible to
      fix it with something like
<programlisting>
UPDATE mytab SET bitcol = ~(~bitcol) WHERE bitcol != ~(~bitcol);
</programlisting>
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bd1ef5799] 2019-10-28 12:21:13 -0400
Branch: REL_12_STABLE [43e43771b] 2019-10-28 12:21:13 -0400
-->
     <para>
      Fix result of text <function>position()</function> function (also
      known as <function>strpos()</function>) for an empty search string
      (Tom Lane)
     </para>

     <para>
      Historically, and per the SQL standard, the result should be one in
      such cases, but 12.0 returned zero.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a7145f6bc] 2019-11-07 11:22:58 -0500
Branch: REL_12_STABLE [f6e72dc9c] 2019-11-07 11:22:59 -0500
Branch: REL_11_STABLE [b49b7f944] 2019-11-07 11:23:00 -0500
Branch: REL_10_STABLE [5f794f757] 2019-11-07 11:23:02 -0500
Branch: REL9_6_STABLE [15783d057] 2019-11-07 11:23:03 -0500
Branch: REL9_5_STABLE [84780d468] 2019-11-07 11:23:04 -0500
Branch: REL9_4_STABLE [8d380864a] 2019-11-07 11:23:06 -0500
Branch: REL9_6_STABLE [a55018760] 2019-11-09 15:50:16 -0500
Branch: REL9_5_STABLE [30f6998ff] 2019-11-09 15:50:16 -0500
Branch: REL9_4_STABLE [18622caa3] 2019-11-09 15:50:16 -0500
-->
     <para>
      Fix detection of edge-case integer overflow in interval
      multiplication (Yuya Watari)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8af1624e3] 2019-11-02 16:45:32 -0400
Branch: REL_12_STABLE [43753c2cf] 2019-11-02 16:45:32 -0400
Branch: REL_11_STABLE [65cdf8bc1] 2019-11-02 16:45:32 -0400
Branch: REL_10_STABLE [680aabd2f] 2019-11-02 16:45:32 -0400
Branch: REL9_6_STABLE [51b9ac558] 2019-11-02 16:45:32 -0400
Branch: master [db27b60f0] 2019-11-03 16:10:23 -0500
Branch: REL_12_STABLE [6dd92138d] 2019-11-03 16:10:38 -0500
Branch: REL_11_STABLE [88d03d73c] 2019-11-03 16:10:45 -0500
Branch: REL_10_STABLE [4077e9ae1] 2019-11-03 16:10:56 -0500
Branch: REL9_6_STABLE [d43bd9dce] 2019-11-03 16:11:05 -0500
-->
     <para>
      Avoid crashes if <literal>ispell</literal> text search dictionaries
      contain wrong affix data (Arthur Zakirov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
Branch: master [70a6c37d5] 2019-10-21 08:57:32 +0530
Branch: REL_12_STABLE [62f4dd379] 2019-10-21 09:04:35 +0530
-->
     <para>
      Avoid memory leak while vacuuming a GiST index (Dilip Kumar)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [db477b691] 2019-10-21 14:18:01 -0400
Branch: REL_12_STABLE [4f2ad5226] 2019-10-21 14:18:16 -0400
Branch: REL_11_STABLE [a05a04d0e] 2019-10-21 14:18:31 -0400
Branch: REL_10_STABLE [aebe3ef0e] 2019-10-21 14:18:38 -0400
Branch: REL9_6_STABLE [185253ab8] 2019-10-21 14:18:47 -0400
Branch: REL9_5_STABLE [e3267407e] 2019-10-21 14:18:55 -0400
Branch: REL9_4_STABLE [fedcab352] 2019-10-21 14:19:03 -0400
-->
     <para>
      On Windows, recognize additional spellings of the <quote>Norwegian
      (Bokm&aring;l)</quote> locale name (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [4f4061b2d] 2019-10-21 11:17:13 +0900
Branch: REL_12_STABLE [2b0f959b5] 2019-10-21 11:17:43 +0900
Branch: master [57379cd5a] 2019-10-23 11:34:18 +0900
Branch: REL_12_STABLE [a6a95d4f3] 2019-10-23 11:34:42 +0900
-->
     <para>
      Fix <application>libpq</application> to allow trailing whitespace in
      the string values of integer parameters (Michael Paquier)
     </para>

     <para>
      Version 12 tightened <application>libpq</application>'s validation
      of integer parameters, but disallowing trailing whitespace seems
      undesirable.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [ba19a6b73] 2019-10-21 11:39:15 +0900
Branch: REL_12_STABLE [ed5109a61] 2019-10-21 11:39:28 +0900
-->
     <para>
      In <application>libpq</application>, correctly
      report <literal>CONNECTION_BAD</literal> connection status after a
      failure caused by a syntactically
      invalid <option>connect_timeout</option> parameter value (Lars Kanis)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c8cb98ec4] 2019-11-07 14:21:52 -0500
Branch: REL_12_STABLE [101654987] 2019-11-07 14:21:52 -0500
Branch: REL_11_STABLE [89f56fc22] 2019-11-07 14:21:52 -0500
Branch: REL_10_STABLE [831ca9513] 2019-11-07 14:21:52 -0500
Branch: REL9_6_STABLE [baa483984] 2019-11-07 14:21:52 -0500
Branch: REL9_5_STABLE [b705d6391] 2019-11-07 14:21:52 -0500
Branch: REL9_4_STABLE [b20233aac] 2019-11-07 14:21:52 -0500
-->
     <para>
      Avoid compile failure if an ECPG client
      includes <filename>ecpglib.h</filename> while
      having <literal>ENABLE_NLS</literal> defined (Tom Lane)
     </para>

     <para>
      This risk was created by a misplaced
      declaration: <function>ecpg_gettext()</function> should not be
      visible to client code.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [1752e3516] 2019-10-17 09:58:01 +0200
Branch: REL_12_STABLE [b304b2b65] 2019-10-17 09:58:01 +0200
-->
     <para>
      Fix scheduling of parallel restore of a foreign key constraint on a
      partitioned table (&Aacute;lvaro Herrera)
     </para>

     <para>
      <application>pg_dump</application> failed to emit full dependency
      information for partitioned tables' foreign keys.  This could allow
      parallel <application>pg_restore</application> to try to recreate a
      foreign key constraint too soon.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5102f3944] 2019-11-04 16:25:05 -0500
Branch: REL_12_STABLE [ca27a84c9] 2019-11-04 16:25:05 -0500
Branch: REL_11_STABLE [078f5bc8e] 2019-11-04 16:25:05 -0500
Branch: REL_10_STABLE [ee8b95f26] 2019-11-04 16:25:05 -0500
Branch: REL9_6_STABLE [648f17879] 2019-11-04 16:25:05 -0500
Branch: REL9_5_STABLE [74d32ee70] 2019-11-04 16:25:05 -0500
Branch: REL9_4_STABLE [da5cd7a68] 2019-11-04 16:25:05 -0500
-->
     <para>
      In <application>pg_dump</application>, ensure stable output order
      for similarly-named triggers and row-level-security policy objects
      (Benjie Gillam)
     </para>

     <para>
      Previously, if two triggers on different tables had the same names,
      they would be sorted in OID-based order, which is less desirable
      than sorting them by table name.  Likewise for RLS policies.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [0ccfc2822] 2019-10-14 22:31:56 +0200
Branch: REL_12_STABLE [eaf900e84] 2019-10-14 23:40:58 +0200
Branch: master [3a0e85739] 2019-10-15 00:25:04 +0200
Branch: REL_12_STABLE [702fd3b71] 2019-10-15 00:35:51 +0200
-->
     <para>
      In <application>pg_upgrade</application>, reject tables with
      columns of type <type>sql_identifier</type>, as that has changed
      representation in version 12 (Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [8d48e6a72] 2019-10-16 13:23:14 +0200
Branch: REL_12_STABLE [ebb4caa91] 2019-10-16 13:25:25 +0200
Branch: REL_11_STABLE [a970b6cde] 2019-10-16 13:26:22 +0200
Branch: REL_10_STABLE [2218fdca4] 2019-10-16 13:26:53 +0200
Branch: REL9_6_STABLE [0a643de08] 2019-10-16 13:27:24 +0200
Branch: REL9_5_STABLE [f57b01dd7] 2019-10-16 13:27:51 +0200
Branch: REL9_4_STABLE [235a52ca0] 2019-10-16 13:31:00 +0200
Branch: REL9_6_STABLE [e09ab32a2] 2019-10-16 16:20:07 +0200
Branch: REL9_5_STABLE [984aa0ede] 2019-10-16 16:23:09 +0200
Branch: REL9_4_STABLE [bc3a94dc0] 2019-10-16 16:28:48 +0200
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Branch: master [a524f50d0] 2019-10-16 13:23:18 +0200
Branch: REL_12_STABLE [a8e49ae0c] 2019-10-16 13:25:37 +0200
Branch: REL_11_STABLE [d071a2539] 2019-10-16 13:26:26 +0200
Branch: REL_10_STABLE [e86ece221] 2019-10-16 13:26:56 +0200
-->
     <para>
      Improve <application>pg_upgrade</application>'s checks for the use
      of a data type that has changed representation, such
      as <type>line</type> (Tomas Vondra)
     </para>

     <para>
      The previous coding could be fooled by cases where the data type of
      interest underlies a stored column of a domain or composite type.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
Branch: master [6f3823b03] 2019-10-04 09:14:51 +0900
Branch: REL_12_STABLE [c2e3b311d] 2019-10-04 09:16:03 +0900
-->
     <para>
      In <application>pg_rewind</application>
      with the <option>--dry-run</option> option, avoid
      updating <filename>pg_control</filename>
      (Alexey Kondratov)
     </para>

     <para>
      This could lead to failures in
      subsequent <application>pg_rewind</application> attempts.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [a0c96856e] 2019-11-07 16:31:36 +0900
Branch: REL_12_STABLE [e5cfb8cbb] 2019-11-07 16:32:37 +0900
Branch: REL_11_STABLE [fb53c4c07] 2019-11-07 16:32:58 +0900
Branch: REL_10_STABLE [127ad57f5] 2019-11-07 16:33:06 +0900
Branch: REL9_6_STABLE [aa7cd6a8e] 2019-11-07 16:33:23 +0900
Branch: REL9_5_STABLE [b1bebc2ce] 2019-11-07 16:33:47 +0900
Branch: REL9_4_STABLE [1accf9974] 2019-11-07 16:33:58 +0900
-->
     <para>
      Fix failure in <application>pg_waldump</application> with
      the <option>-s</option> option, when a continuation WAL record ends
      exactly at a page boundary (Andrey Lepikhov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [e4d92126f] 2019-10-29 22:53:05 -0700
Branch: REL_12_STABLE [d4b5206b2] 2019-10-29 22:53:30 -0700
Branch: REL_11_STABLE [3b24cf732] 2019-10-29 22:53:33 -0700
Branch: REL_10_STABLE [82200115e] 2019-10-29 22:53:37 -0700
Branch: REL9_6_STABLE [bc4f56c18] 2019-10-29 22:54:36 -0700
Branch: REL9_5_STABLE [39ff656a4] 2019-10-29 22:55:19 -0700
-->
     <para>
      In <application>pg_waldump</application> with
      the <option>--bkp-details</option> option, avoid emitting extra
      newlines for WAL records involving full-page writes (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [e0f76f204] 2019-10-29 19:18:07 -0700
Branch: REL_12_STABLE [4ab353c47] 2019-10-29 19:28:34 -0700
Branch: REL_11_STABLE [af67aee69] 2019-10-29 19:28:34 -0700
Branch: REL_10_STABLE [e3ff8c360] 2019-10-29 19:28:34 -0700
Branch: REL9_6_STABLE [95f2efd50] 2019-10-29 19:28:34 -0700
Branch: REL9_5_STABLE [c3882f8b8] 2019-10-29 19:28:34 -0700
-->
     <para>
      Fix small memory leak in <application>pg_waldump</application>
      (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [06a367c38] 2019-10-10 14:24:56 -0400
Branch: REL_12_STABLE [7ed1bcaed] 2019-10-10 14:24:57 -0400
-->
     <para>
      Put back <function>pqsignal()</function> as an
      exported <application>libpq</application> symbol (Tom Lane)
     </para>

     <para>
      This function was removed on the grounds that no clients should be
      using it, but that turns out to break usage of
      current <application>libpq</application> with very old versions
      of <application>psql</application>, and perhaps other applications.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d995fd667] 2019-10-21 13:52:25 -0400
Branch: REL_12_STABLE [ca658c91a] 2019-10-21 13:52:25 -0400
Branch: REL_11_STABLE [4e19bd41d] 2019-10-21 13:52:25 -0400
Branch: REL_10_STABLE [328b81348] 2019-10-21 13:52:25 -0400
Branch: REL9_6_STABLE [34621cb12] 2019-10-21 13:52:25 -0400
Branch: REL9_5_STABLE [8835e0bd4] 2019-10-21 13:52:26 -0400
Branch: REL9_4_STABLE [6d2b18d07] 2019-10-21 13:52:26 -0400
Branch: master [44273ce4f] 2019-10-21 12:32:35 -0400
Branch: REL_12_STABLE [aa5bb828a] 2019-10-21 12:32:35 -0400
Branch: REL_11_STABLE [99c51d5ed] 2019-10-21 12:32:36 -0400
Branch: REL_10_STABLE [e167b1ae3] 2019-10-21 12:32:36 -0400
Branch: REL9_6_STABLE [62ca50ad7] 2019-10-21 12:32:36 -0400
Branch: REL9_5_STABLE [11330c311] 2019-10-21 12:32:36 -0400
Branch: REL9_4_STABLE [727c2ccfe] 2019-10-21 12:32:36 -0400
-->
     <para>
      Fix <application>configure</application>'s test for presence of
      libperl so that it works on recent Red Hat releases (Tom Lane)
     </para>

     <para>
      Previously, it could fail if the user sets <literal>CFLAGS</literal>
      to <literal>-O0</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [89b4d7744] 2019-10-18 20:20:28 -0700
Branch: REL_12_STABLE [ef13f914e] 2019-10-18 20:20:31 -0700
Branch: REL_11_STABLE [af4477b00] 2019-10-18 20:20:32 -0700
Branch: REL_10_STABLE [083929372] 2019-10-18 20:20:32 -0700
Branch: REL9_6_STABLE [09d74aef3] 2019-10-18 20:20:32 -0700
Branch: REL9_5_STABLE [62e881946] 2019-10-18 20:20:32 -0700
Branch: REL9_4_STABLE [930787c7f] 2019-10-18 20:20:33 -0700
-->
     <para>
      Ensure correct code generation for spinlocks on PowerPC (Noah Misch)
     </para>

     <para>
      The previous spinlock coding allowed the compiler to select register
      zero for use with an assembly instruction that does not accept that
      register, causing a build failure.  We have seen only one long-ago
      report that matches this bug, but it could cause problems for people
      trying to build modified <productname>PostgreSQL</productname> code
      or use atypical compiler options.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [5f3d271d0] 2019-10-12 00:21:47 -0700
Branch: REL_12_STABLE [3fb14cfcb] 2019-10-12 00:21:50 -0700
Branch: REL_11_STABLE [e5b4926ef] 2019-10-12 00:21:50 -0700
Branch: REL_10_STABLE [77cc4a595] 2019-10-12 00:21:50 -0700
Branch: REL9_6_STABLE [c73f4f680] 2019-10-12 00:21:50 -0700
Branch: REL9_5_STABLE [e40eb31c0] 2019-10-12 00:21:51 -0700
Branch: REL9_4_STABLE [b705582b4] 2019-10-12 00:21:51 -0700
-->
     <para>
      On AIX, don't use the compiler option <option>-qsrcmsg</option>
      (Noah Misch)
     </para>

     <para>
      This avoids an internal compiler error with xlc v16.1.0, with little
      consequence other than changing the format of compiler error messages.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [ad7595b89] 2019-10-04 15:34:40 -0400
Branch: REL_12_STABLE [ec38d2311] 2019-10-04 15:39:27 -0400
Branch: REL_11_STABLE [3b9c22700] 2019-10-04 15:39:19 -0400
Branch: REL_10_STABLE [62d2caed6] 2019-10-04 15:39:12 -0400
Branch: REL9_6_STABLE [1e9a0487d] 2019-10-04 15:39:02 -0400
Branch: REL9_5_STABLE [6ca51b155] 2019-10-04 15:38:48 -0400
Branch: REL9_4_STABLE [8f8809091] 2019-10-04 15:38:36 -0400
-->
     <para>
      Fix MSVC build process to cope with spaces in the file path of
      OpenSSL (Andrew Dunstan)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-12">
  <title>Release 12</title>

  <formalpara>
   <title>Release date:</title>
   <para>2019-10-03</para>
  </formalpara>

  <sect2>
   <title>Overview</title>

   <para>
    Major enhancements in <productname>PostgreSQL</productname> 12 include:
   </para>

   <!-- Items in this list summarize one or more items below -->

   <itemizedlist>

    <listitem>
     <para>
      General performance improvements, including:
      <itemizedlist>
       <listitem>
        <para>
         Optimizations to space utilization and read/write performance for
         B-tree indexes
        </para>
       </listitem>

       <listitem>
        <para>
         Partitioning performance enhancements, including improved query
         performance on tables with thousands of partitions, improved
         insertion performance with <xref linkend="sql-insert"/> and <xref
         linkend="sql-copy"/>, and the ability to execute <link
         linkend="sql-altertable-attach-partition"><command>ALTER TABLE ATTACH
         PARTITION</command></link> without blocking queries
        </para>
       </listitem>

       <listitem>
        <para>
         Automatic (but overridable) inlining
         of <link linkend="queries-with">common table expressions</link>
         (<acronym>CTEs</acronym>)
        </para>
       </listitem>

       <listitem>
        <para>
         Reduction of <acronym>WAL</acronym> overhead for creation of
         <link linkend="gist">GiST</link>, <link linkend="gin">GIN</link>, and
         <link linkend="spgist">SP-GiST</link> indexes
        </para>
       </listitem>

       <listitem>
        <para>
         Support for covering <link linkend="gist">GiST</link> indexes, via
         the <link linkend="indexes-index-only-scans"><literal>INCLUDE</literal></link>
         clause
        </para>
       </listitem>

       <listitem>
        <para>
         Multi-column most-common-value (MCV) statistics can be defined
         via <xref linkend="sql-createstatistics"/>, to support better
         plans for queries that test several non-uniformly-distributed
         columns
        </para>
       </listitem>
      </itemizedlist>
     </para>
    </listitem>

    <listitem>
     <para>
      Enhancements to administrative functionality, including:
      <itemizedlist>
       <listitem>
        <para>
         <link linkend="sql-reindex-concurrently"><command>REINDEX
         CONCURRENTLY</command></link> can rebuild an index without
         blocking writes to its table
        </para>
       </listitem>

       <listitem>
        <para>
         <xref linkend="app-pgchecksums"/> can enable/disable page checksums
         (used for detecting data corruption) in an offline cluster
        </para>
       </listitem>

       <listitem>
        <para>
         Progress reporting statistics for <xref linkend="sql-createindex"/>,
         <xref linkend="sql-reindex"/>, <xref linkend="sql-cluster"/>,
         <link linkend="sql-vacuum">VACUUM FULL</link>, and
         <xref linkend="app-pgchecksums"/>
        </para>
       </listitem>
      </itemizedlist>
     </para>
    </listitem>

    <listitem>
     <para>
       Support for the <link
       linkend="functions-sqljson-path"><acronym>SQL/JSON</acronym>
       path</link> language
     </para>
    </listitem>

    <listitem>
     <para>
       Stored <link linkend="ddl-generated-columns">generated columns</link>
     </para>
    </listitem>

    <listitem>
     <para>
       <link linkend="collation-nondeterministic">Nondeterministic</link> ICU
       collations, enabling case-insensitive and accent-insensitive grouping
       and ordering
     </para>
    </listitem>

    <listitem>
     <para>
      New authentication features, including:
      <itemizedlist>
       <listitem>
        <para>
         Encryption of TCP/IP connections when using
         <link linkend="gssapi-auth"><acronym>GSSAPI</acronym></link>
         authentication
        </para>
       </listitem>

       <listitem>
        <para>
         Discovery of LDAP servers using <acronym>DNS SRV</acronym> records
        </para>
       </listitem>

       <listitem>
        <para>
         Multi-factor authentication, using the <link linkend="auth-cert">
         <literal>clientcert=verify-full</literal></link> option combined
         with an additional authentication method in
         <filename>pg_hba.conf</filename>
        </para>
       </listitem>
      </itemizedlist>
     </para>
    </listitem>

   </itemizedlist>

   <para>
    The above items are explained in more detail in the sections below.
   </para>

  </sect2>

  <sect2>

  <title>Migration to Version 12</title>

   <para>
    A dump/restore using <xref linkend="app-pg-dumpall"/> or use of <xref
    linkend="pgupgrade"/> or logical replication is required for those
    wishing to migrate data from any previous release.  See <xref
    linkend="upgrading"/> for general information on migrating to new major
    releases.
   </para>

   <para>
    Version 12 contains a number of changes that may affect compatibility
    with previous releases.  Observe the following incompatibilities:
   </para>

   <itemizedlist>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
2018-11-20 [578b22971] Remove WITH OIDS support, change oid catalog column visi
-->

     <para>
      Remove the special behavior of <link
      linkend="datatype-oid">oid</link> columns (Andres Freund,
      John Naylor)
     </para>

     <para>
      Previously, a normally-invisible <structfield>oid</structfield>
      column could be specified during table creation using <literal>WITH
      OIDS</literal>; that ability has been removed.  Columns can still be
      explicitly declared as type <type>oid</type>.  Operations on tables
      that have columns created using <literal>WITH OIDS</literal> will
      need adjustment.
     </para>

     <para>
      The system catalogs that previously had
      hidden <structfield>oid</structfield> columns now have
      ordinary <structfield>oid</structfield> columns.
      Hence, <command>SELECT *</command> will now output those columns,
      whereas previously they would be displayed only if selected
      explicitly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
2018-10-11 [cda6a8d01] Remove deprecated abstime, reltime, tinterval datatypes.
-->

     <para>
      Remove data types <type>abstime</type>, <type>reltime</type>,
      and <type>tinterval</type> (Andres Freund)
     </para>

     <para>
      These are obsoleted by SQL-standard types such
      as <type>timestamp</type>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
2018-10-11 [2d10defa7] Remove timetravel extension.
-->

     <para>
      Remove the <filename>timetravel</filename> extension
      (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-25 [2dedf4d9a] Integrate recovery.conf into postgresql.conf
-->

     <para>
      Move <filename>recovery.conf</filename> settings into <link
      linkend="runtime-config-wal-archive-recovery"><filename>postgresql.conf</filename></link>
      (Masao Fujii, Simon Riggs, Abhijit Menon-Sen, Sergei Kornilov)
     </para>

     <para>
      <filename>recovery.conf</filename> is no longer used,
      and the server will not start if that file exists.  <link
      linkend="runtime-config-wal-archive-recovery">recovery.signal</link>
      and <filename>standby.signal</filename> files are now used to switch
      into non-primary mode.  The <varname>trigger_file</varname> setting
      has been renamed to <xref linkend="guc-promote-trigger-file"/>.  The
      <varname>standby_mode</varname> setting has been removed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-28 [f2cbffc7a] Only allow one recovery target setting
-->

     <para>
      Do not allow multiple conflicting <link
      linkend="runtime-config-wal-recovery-target"><varname>recovery_target</varname>*</link>
      specifications (Peter Eisentraut)
     </para>

     <para>
      Specifically, only allow one of <xref
      linkend="guc-recovery-target"/>, <xref
      linkend="guc-recovery-target-lsn"/>,
      <xref linkend="guc-recovery-target-name"/>,
      <xref linkend="guc-recovery-target-time"/>, and <xref
      linkend="guc-recovery-target-xid"/>.  Previously, multiple different
      instances of these parameters could be specified, and the last one
      was honored.  Now, only one can be specified, though the same one can
      be specified multiple times and the last specification is honored.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-01-13 [0acb3bc33] Change default of recovery_target_timeline to <literal>latest</literal>
-->

     <para>
      Cause recovery to advance to the latest timeline by default
      (Peter Eisentraut)
     </para>

     <para>
      Specifically, <xref linkend="guc-recovery-target-timeline"/> now
      defaults to <literal>latest</literal>.  Previously, it defaulted
      to <literal>current</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2018-07-29 [a7dc63d90] Refactor geometric functions and operators
2018-08-16 [c4c340088] Use the built-in float datatypes to implement geometric
2018-09-26 [2e2a392de] Fix problems in handling the line data type
-->

     <para>
      Refactor code for <link linkend="functions-geometry">geometric
      functions and operators</link> (Emre Hasegeli)
     </para>

     <para>
      This could lead to more accurate, but slightly different, results
      compared to previous releases.  Notably, cases involving NaN,
      underflow, overflow, and division by zero are handled more
      consistently than before.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
2019-02-13 [02ddd4993] Change floating-point output format for improved perform
2018-10-12 [f1885386f] Make float exponent output on Windows look the same as e
-->

     <para>
      Improve performance by using a new algorithm for output
      of <link linkend="datatype-float"><type>real</type></link>
      and <type>double precision</type> values (Andrew Gierth)
     </para>

     <para>
      Previously, displayed floating-point values were rounded to 6
      (for <type>real</type>) or 15 (for <type>double precision</type>)
      digits by default, adjusted by the value of
      <xref linkend="guc-extra-float-digits"/>.  Now,
      whenever <varname>extra_float_digits</varname> is more than zero (as
      it now is by default), only the minimum number of digits required to
      preserve the exact binary value are output.  The behavior is the
      same as before when <varname>extra_float_digits</varname> is set to
      zero or less.
     </para>

     <para>
      Also, formatting of floating-point exponents is now uniform across
      platforms: two digits are used unless three are necessary.  In
      previous releases, Windows builds always printed three digits.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-29 [6645ad6bd] Use a separate random seed for SQL random()/setseed() fu
2018-12-29 [4203842a1] Use pg_strong_random() to select each server process's r
-->

     <para>
       <link linkend="functions-math-random-table"><function>random()</function></link>
      and <function>setseed()</function> now behave uniformly across
      platforms (Tom Lane)
     </para>

     <para>
      The sequence of <function>random()</function> values generated
      following a <function>setseed()</function> call with a particular
      seed value is likely to be different now than before.  However, it
      will also be repeatable, which was not previously guaranteed because
      of interference from other uses of random numbers inside the server.
      The SQL <function>random()</function> function now has its own
      private per-session state to forestall that.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-05-14 [7c850320d] Fix SQL-style substring() to have spec-compliant greedin
-->

     <para>
      Change SQL-style
      <link linkend="functions-similarto-regexp"><function>substring()</function></link>
      to have standard-compliant greediness behavior (Tom Lane)
     </para>

     <para>
      In cases where the pattern can be matched in more than one way, the
      initial sub-pattern is now treated as matching the least possible
      amount of text rather than the greatest; for example, a pattern such
      as <literal>%#"aa*#"%</literal> now selects the first group
      of <literal>a</literal>'s from the input, not the last group.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-04-23 [c06e3550d] Don't request pretty-printed output from xmlNodeDump().
-->

     <para>
      Do not pretty-print the result
      of <link linkend="functions-xml"><function>xpath()</function></link>
      or the <literal>XMLTABLE</literal> construct (Tom Lane)
     </para>

     <para>
      In some cases, these functions would insert extra whitespace
      (newlines and/or spaces) in nodeset values.  This is undesirable
      since depending on usage, the whitespace might be considered
      semantically significant.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-03-13 [6dd263cfa] Rename pg_verify_checksums to pg_checksums
-->

     <para>
      Rename command-line tool
      <application>pg_verify_checksums</application> to <xref
      linkend="app-pgchecksums"/> (Michaël Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-04 [413ccaa74] pg_restore: Require -f - to mean stdout
-->

     <para>
      In <xref linkend="app-pgrestore"/>, require specification of
      <literal>-f -</literal> to send the dump contents to standard output
      (Euler Taveira)
     </para>

     <para>
      Previously, this happened by default if no destination was
      specified, but that was deemed to be unfriendly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-11-14 [eaf746a5b] Make psql's "\pset format" command reject non-unique abb
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-11-26 [a7eece4fc] Fix breakage of "\pset format latex".
-->

     <para>
      Disallow non-unique abbreviations
      in <application>psql</application>'s <command>\pset format</command>
      command (Daniel Vérité)
     </para>

     <para>
      Previously, for example, <command>\pset format a</command> chose
      <literal>aligned</literal>; it will now fail since that could
      equally well mean <literal>asciidoc</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
2019-03-20 [dd299df81] Make heap TID a tiebreaker nbtree index column.
-->

     <para>
      In new btree indexes, the maximum index entry length is
      reduced by eight bytes, to improve handling of duplicate entries
      (Peter Geoghegan)
     </para>

     <para>
      This means that a <xref linkend="sql-reindex"/> operation on an
      index <application>pg_upgrade</application>'d from a previous
      release could potentially fail.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-21 [bfb456c1b] Improve error reporting for DROP FUNCTION/PROCEDURE/AGGR
-->

     <para>
      Cause <link linkend="sql-dropfunction"><command>DROP IF EXISTS
      FUNCTION</command></link>/<literal>PROCEDURE</literal>/<literal>AGGREGATE</literal>/<literal>ROUTINE</literal>
      to generate an error if no argument list is supplied and there are
      multiple matching objects (David Rowley)
     </para>

     <para>
      Also improve the error message in such cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2019-06-16 [6cbfb784c] Rework the pg_statistic_ext catalog
2019-06-16 [aa087ec64] Add pg_stats_ext view for extended statistics
-->

     <para>
      Split the <link
      linkend="catalog-pg-statistic-ext"><structname>pg_statistic_ext</structname></link>
      catalog into two catalogs, and add the <link
      linkend="view-pg-stats-ext"><structname>pg_stats_ext</structname></link>
      view of it (Dean Rasheed, Tomas Vondra)
     </para>

     <para>
      This change supports hiding potentially-sensitive statistics data
      from unprivileged users.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-01 [96b00c433] Remove obsolete pg_constraint.consrc column
-->

     <para>
      Remove obsolete <link
      linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>consrc</structfield>
      column (Peter Eisentraut)
     </para>

     <para>
      This column has been deprecated for a long time, because it did not
      update in response to other catalog changes (such as column renamings).
      The recommended way to get a text version of a check constraint's
      expression from <structname>pg_constraint</structname>
      is <literal>pg_get_expr(conbin, conrelid)</literal>.
      <function>pg_get_constraintdef()</function> is also a useful
      alternative.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-01 [fe5038236] Remove obsolete pg_attrdef.adsrc column
-->

     <para>
      Remove obsolete <link
      linkend="catalog-pg-attrdef"><structname>pg_attrdef</structname></link>.<structfield>adsrc</structfield>
      column (Peter Eisentraut)
     </para>

     <para>
      This column has been deprecated for a long time, because it did not
      update in response to other catalog changes (such as column renamings).
      The recommended way to get a text version of a default-value expression
      from <structname>pg_attrdef</structname> is <literal>pg_get_expr(adbin,
      adrelid)</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-19 [586b98fdf] Make type "name" collation-aware.
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-04-05 [478cacb50] Ensure consistent name matching behavior in processSQLNa
-->

     <para>
      Mark table columns of type <link
      linkend="datatype-character-special-table">name</link> as having
      <quote>C</quote> collation by default (Tom Lane, Daniel Vérité)
     </para>

     <para>
      The comparison operators for data type <type>name</type> can now use
      any collation, rather than always using <quote>C</quote> collation.
      To preserve the previous semantics of queries, columns of
      type <type>name</type> are now explicitly marked as
      having <quote>C</quote> collation.  A side effect of this is that
      regular-expression operators on <type>name</type> columns will now
      use the <quote>C</quote> collation by default, not the database
      collation, to determine the behavior of locale-dependent regular
      expression patterns (such as <literal>\w</literal>).  If you want
      non-C behavior for a regular expression on a <type>name</type>
      column, attach an explicit <literal>COLLATE</literal> clause.  (For
      user-defined <type>name</type> columns, another possibility is to
      specify a different collation at table creation time; but that just
      moves the non-backwards-compatibility to the comparison operators.)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-20 [7c15cef86] Base information_schema.sql_identifier domain on name, n
2018-12-20 [5bbee34d9] Avoid producing over-length specific_name outputs in inf
2018-12-18 [6b0faf723] Make collation-aware system catalog columns use "C" coll
-->

     <para>
      Treat object-name columns in
      the <link linkend="information-schema"><structname>information_schema</structname></link>
      views as being of type <type>name</type>, not <type>varchar</type>
      (Tom Lane)
     </para>

     <para>
      Per the SQL standard, object-name columns in
      the <structname>information_schema</structname> views are declared
      as being of domain type <type>sql_identifier</type>.
      In <productname>PostgreSQL</productname>, the underlying catalog
      columns are really of type <type>name</type>.  This change
      makes <type>sql_identifier</type> be a domain
      over <type>name</type>, rather than <type>varchar</type> as before.
      This eliminates a semantic mismatch in comparison and sorting
      behavior, which can greatly improve the performance of queries
      on <structname>information_schema</structname> views that restrict
      an object-name column.  Note however that inequality restrictions,
      for example
<programlisting>
SELECT ... FROM information_schema.tables WHERE table_name &lt; 'foo';
</programlisting>
      will now use <quote>C</quote>-locale comparison semantics by
      default, rather than the database's default collation as before.
      Sorting on these columns will also follow <quote>C</quote> ordering
      rules.  The previous behavior (and inefficiency) can be enforced by
      adding a <literal>COLLATE "default"</literal> clause.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-07-10 [bcbd94080] Remove dynamic_shared_memory_type=none
-->

     <para>
      Remove the ability to disable dynamic shared memory (Kyotaro
      Horiguchi)
     </para>

     <para>
      Specifically, <xref linkend="guc-dynamic-shared-memory-type"/>
      can no longer be set to <literal>none</literal>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-09-12 [e7a221797] Parse more strictly integer parameters from connection s
-->

     <para>
      Parse libpq integer connection parameters more strictly (Fabien
      Coelho)
     </para>

     <para>
      In previous releases, using an incorrect integer value for
      connection parameters <literal>connect_timeout</literal>,
      <literal>keepalives</literal>, <literal>keepalives_count</literal>,
      <literal>keepalives_idle</literal>,
      <literal>keepalives_interval</literal> and <literal>port</literal>
      resulted in libpq either ignoring those values or failing with
      incorrect error messages.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>

  <sect2>
   <title>Changes</title>

    <para>
     Below you will find a detailed account of the changes between
     <productname>PostgreSQL</productname> 12 and the previous
     major release.
    </para>

   <sect3>
    <title>Server</title>

    <sect4>
     <title><link linkend="ddl-partitioning">Partitioning</link></title>

     <itemizedlist>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-11-07 [c6e4133fa] Postpone calculating total_table_pages until after pruni
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-11-15 [34c9e455d] Improve performance of partition pruning remapping a lit
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2018-11-16 [3f2393ede] Redesign initialization of partition routing structures
Author: Robert Haas <rhaas@postgresql.org>
2019-02-21 [9eefba181] Delay lock acquisition for partitions until we route a t
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-30 [428b260f8] Speed up planning when partitions can be pruned at plan
-->

       <para>
        Improve performance of many operations on partitioned tables
        (Amit Langote, David Rowley, Tom Lane, Álvaro Herrera)
       </para>

       <para>
        Allow tables with thousands of child partitions to be processed
        efficiently by operations that only affect a small number of
        partitions.
       </para>
      </listitem>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-03 [f56f8f8da] Support foreign keys that reference partitioned tables
-->

       <para>
        Allow <link linkend="ddl-constraints-fk">foreign keys</link>
        to reference partitioned tables (Álvaro Herrera)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-08-01 [0d5f05cde] Allow multi-inserts during COPY into a partitioned table
-->

       <para>
        Improve speed of <command>COPY</command> into partitioned tables
        (David Rowley)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-01-25 [7c079d741] Allow generalized expression syntax for partition bounds
-->

       <para>
        Allow partition bounds to be any expression (Kyotaro Horiguchi,
        Tom Lane, Amit Langote)
       </para>

       <para>
        Such expressions are evaluated at partitioned-table creation time.
        Previously, only simple constants were allowed as partition bounds.
       </para>
      </listitem>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2018-12-17 [ca4103025] Fix tablespace handling for partitioned tables
-->

       <para>
        Allow <command>CREATE TABLE</command>'s tablespace specification
        for a partitioned table to affect the tablespace of its children
        (David Rowley, Álvaro Herrera)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-04-05 [959d00e9d] Use Append rather than MergeAppend for scanning ordered
-->

       <para>
        Avoid sorting when partitions are already being scanned in the
        necessary order (David Rowley)
       </para>
      </listitem>

      <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2019-03-07 [898e5e329] Allow ATTACH PARTITION with only ShareUpdateExclusiveLoc
-->

       <para>
        <link linkend="sql-altertable"><command>ALTER TABLE ATTACH
        PARTITION</command></link> is now performed with reduced locking
        requirements (Robert Haas)
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-02-08 [3677a0b26] Add pg_partition_root to display top-most parent of a pa
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-03-04 [b96f6b194] pg_partition_ancestors
Author: Michael Paquier <michael@paquier.xyz>
2018-10-30 [d5eec4eef] Add pg_partition_tree to display information about parti
-->

       <para>
        Add partition introspection functions (Michaël Paquier, Álvaro
        Herrera, Amit Langote)
       </para>

       <para>
        The new function <link
        linkend="functions-info-partition"><function>pg_partition_root()</function></link>
        returns the top-most parent of a partition tree, <link
        linkend="functions-info-partition"><function>pg_partition_ancestors()</function></link>
        reports all ancestors of a partition, and <link
        linkend="functions-info-partition"><function>pg_partition_tree()</function></link>
        displays information about partitions.
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-12-18 [f94cec644] Include partitioned indexes to system view pg_indexes
-->

       <para>
        Include partitioned indexes in the system view <link
        linkend="view-pg-indexes"><structname>pg_indexes</structname></link>
        (Suraj Kharage)
       </para>
      </listitem>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-07 [1c5d9270e] psql \dP: list partitioned tables and indexes
-->

       <para>
        Add <application>psql</application> command <command>\dP</command>
        to list partitioned tables and indexes (Pavel Stehule)
       </para>
      </listitem>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2018-11-19 [d56e0fde8] psql: Describe partitioned tables/indexes as such
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-03-26 [1af25ca0c] Improve psql's \d display of foreign key constraints
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-17 [b036982db] psql: display tablespace for partitioned indexes
-->

       <para>
        Improve <application>psql</application> <command>\d</command>
        and <command>\z</command> display of partitioned tables (Pavel
        Stehule, Michaël Paquier, Álvaro Herrera)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-11 [1d92a0c9f] Redesign the partition dependency mechanism.
-->

       <para>
        Fix bugs that could cause <command>ALTER TABLE DETACH
        PARTITION</command> to leave behind incorrect dependency state,
        allowing subsequent operations to misbehave, for example by not
        dropping a former partition child index when its table is dropped
        (Tom Lane)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Indexes</title>

     <itemizedlist>

      <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
2019-03-20 [dd299df81] Make heap TID a tiebreaker nbtree index column.
Author: Peter Geoghegan <pg@bowt.ie>
2019-03-20 [fab250243] Consider secondary factors during nbtree splits.
Author: Peter Geoghegan <pg@bowt.ie>
2019-03-25 [f21668f32] Add "split after new tuple" nbtree optimization.
-->

       <para>
        Improve performance and space utilization of btree indexes with
        many duplicates (Peter Geoghegan, Heikki Linnakangas)
       </para>

       <para>
        Previously, duplicate index entries were stored unordered within
        their duplicate groups.  This caused overhead during index
        inserts, wasted space due to excessive page splits, and it reduced
        <command>VACUUM</command>'s ability to recycle entire pages.
        Duplicate index entries are now sorted in heap-storage order.
       </para>

       <para>
        Indexes <application>pg_upgrade</application>'d from previous
        releases will not have these benefits.
       </para>
      </listitem>

      <listitem>
<!--
see commits above
-->

       <para>
        Allow multi-column btree indexes to be smaller (Peter Geoghegan,
        Heikki Linnakangas)
       </para>

       <para>
        Internal pages and min/max leaf page indicators now only store
        index keys until the change key, rather than all indexed keys.
        This also improves the locality of index access.
       </para>

       <para>
        Indexes <application>pg_upgrade</application>'d from previous
        releases will not have these benefits.
       </para>
      </listitem>

      <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2018-07-28 [d2086b08b] Reduce path length for locking leaf B-tree pages during
-->

       <para>
        Improve speed of btree index insertions by reducing locking
        overhead (Alexander Korotkov)
       </para>
      </listitem>

      <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2019-03-10 [f2e403803] Support for INCLUDE attributes in GiST indexes
-->

       <para>
        Support <link
        linkend="indexes-index-only-scans"><literal>INCLUDE</literal></link> columns
        in <link linkend="gist">GiST</link> indexes (Andrey Borodin)
       </para>
      </listitem>

      <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2018-09-19 [2a6368343] Add support for nearest-neighbor (KNN) searches to SP-Gi
-->

       <para>
        Add support for nearest-neighbor (<acronym>KNN</acronym>) searches
        of <link linkend="spgist">SP-GiST</link> indexes (Nikita Glukhov,
        Alexander Korotkov, Vlad Sterzhanov)
       </para>

      </listitem>

      <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2019-04-03 [9155580fd] Generate less WAL during GiST, GIN and SP-GiST index bui
-->

       <para>
        Reduce the <acronym>WAL</acronym> write overhead
        of <acronym>GiST</acronym>, <acronym>GIN</acronym>, and
        <acronym>SP-GiST</acronym> index creation (Anastasia Lubennikova,
        Andrey V. Lepikhov)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-03 [80b9e9c46] Improve performance of index-only scans with many index
-->

       <para>
        Allow index-only scans to be more efficient on indexes with many
        columns (Konstantin Knizhnik)
       </para>
      </listitem>

      <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2019-03-05 [fe280694d] Scan GiST indexes in physical order during VACUUM.
-->

       <para>
        Improve the performance of vacuum scans of GiST indexes (Andrey
        Borodin, Konstantin Kuznetsov, Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2019-03-22 [7df159a62] Delete empty pages during GiST VACUUM.
-->

       <para>
        Delete empty leaf pages during <acronym>GiST</acronym>
        <command>VACUUM</command> (Andrey Borodin)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-14 [1b5d797cd] Lower lock level for renaming indexes
-->

       <para>
        Reduce locking requirements for index renaming (Peter Eisentraut)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Optimizer</title>

     <itemizedlist>

      <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2019-03-27 [7300a6995] Add support for multivariate MCV lists
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2019-03-27 [a63b29a1d] Minor improvements for the multivariate MCV lists
-->

       <para>
        Allow <xref linkend="sql-createstatistics"/> to create
        most-common-value statistics for multiple columns (Tomas Vondra)
       </para>

       <para>
        This improves optimization for queries that test several columns,
        requiring an estimate of the combined effect of
        several <literal>WHERE</literal> clauses.  If the columns are
        correlated and have non-uniform distributions then multi-column
        statistics will allow much better estimates.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-16 [608b167f9] Allow user control of CTE materialization, and change th
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-04-09 [947613127] Prevent inlining of multiply-referenced CTEs with outer
-->

       <para>
        Allow <link linkend="queries-with">common table expressions</link>
        (<acronym>CTEs</acronym>) to be inlined into the outer query
        (Andreas Karlsson, Andrew Gierth, David Fetter, Tom Lane)
       </para>

       <para>
        Specifically, <acronym>CTE</acronym>s are automatically inlined if
        they have no side-effects, are not recursive, and are referenced
        only once in the query.  Inlining can be prevented by
        specifying <literal>MATERIALIZED</literal>, or forced for
        multiply-referenced <acronym>CTE</acronym>s by
        specifying <literal>NOT MATERIALIZED</literal>.  Previously,
        <acronym>CTE</acronym>s were never inlined and were always
        evaluated before the rest of the query.
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-07-16 [f7cb2842b] Add plan_cache_mode setting
-->

       <para>
        Allow control over when generic plans are used for prepared
        statements (Pavel Stehule)
       </para>

       <para>
        This is controlled by the <xref linkend="guc-plan-cache_mode"/>
        server parameter.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-25 [8edd0e794] Suppress Append and MergeAppend plan nodes that have a s
-->

       <para>
        Improve optimization of partition and <literal>UNION ALL</literal>
        queries that have only a single child (David Rowley)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-13 [04fe805a1] Drop no-op CoerceToDomain nodes from expressions at plan
-->

       <para>
        Improve processing of <link linkend="domains">domains</link> that
        have no check constraints (Tom Lane)
       </para>

       <para>
        Domains that are being used purely as type aliases no longer cause
        optimization difficulties.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-30 [6f19a8c41] Teach eval_const_expressions to constant-fold LEAST/GREA
-->

       <para>
        Pre-evaluate calls of <link
        linkend="functions-greatest-least"><literal>LEAST</literal></link>
        and <literal>GREATEST</literal> when their arguments are constants
        (Vik Fearing)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-20 [e04a3905e] Improve planner's understanding of strictness of type co
2019-03-01 [65ce07e02] Teach optimizer's predtest.c more things about ScalarArr
-->

       <para>
        Improve optimizer's ability to verify that partial indexes
        with <literal>IS NOT NULL</literal> conditions are usable in
        queries (Tom Lane, James Coleman)
       </para>

       <para>
        Usability can now be recognized in more cases where the calling
        query involves casts or
        large <literal><replaceable>x</replaceable> IN
        (<replaceable>array</replaceable>)</literal> clauses.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-14 [5e0928005] Make pg_statistic and related code account more honestly
-->

       <para>
        Compute <command>ANALYZE</command> statistics using the collation
        defined for each column (Tom Lane)
       </para>

       <para>
        Previously, the database's default collation was used for all
        statistics.  This potentially gives better optimizer behavior for
        columns with non-default collations.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-25 [f7111f72d] Improve planner's selectivity estimates for inequalities
-->

       <para>
        Improve selectivity estimates for inequality comparisons
        on <link linkend="ddl-system-columns"><structfield>ctid</structfield></link>
        columns (Edmund Horner)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-30 [b5415e3c2] Support parameterized TidPaths.
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-30 [0a6ea4001] Add a hash opclass for type "tid".
-->

       <para>
        Improve optimization of joins on columns of type <link
        linkend="datatype-oid"><type>tid</type></link>
        (Tom Lane)
       </para>

       <para>
        These changes primarily improve the efficiency of self-joins
        on <structfield>ctid</structfield> columns.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-07-11 [39a96512b] Mark built-in btree comparison functions as leakproof wh
2019-09-21 [d9110d7e1] Straighten out leakproofness markings on text comparison
-->

       <para>
        Fix the leakproofness designations of some btree comparison operators
        and support functions (Tom Lane)
       </para>

       <para>
        This allows some optimizations that previously would not have been
        applied in the presence of security barrier views or row-level
        security.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>General Performance</title>

     <itemizedlist>

      <listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
2018-09-21 [1f7fc7670] doc:  JIT is enabled by default in PG 12
-->

       <para>
        Enable <link linkend="jit">Just-in-Time</link>
        (<acronym>JIT</acronym>) compilation by default, if the server
        has been built with support for it (Andres Freund)
       </para>

       <para>
        Note that this support is not built by default, but has to be
        selected explicitly while configuring the build.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-01-06 [afb0d0712] Replace the data structure used for keyword lookup.
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-01-09 [c64d0cd5c] Use perfect hashing, instead of binary search, for keywo
-->

       <para>
        Speed up keyword lookup (John Naylor, Joerg Sonnenberger, Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2019-01-25 [9556aa01c] Use single-byte Boyer-Moore-Horspool search even with mu
-->

       <para>
        Improve search performance for multi-byte characters
        in <function>position()</function> and related functions (Heikki
        Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
2019-04-02 [4d0e994ee] Add support for partial TOAST decompression
-->

       <para>
        Allow <link linkend="storage-toast">toasted</link>
        values to be minimally decompressed (Paul Ramsey)
       </para>

       <para>
        This is useful for routines that only need to examine the initial
        portion of a toasted field.
       </para>
      </listitem>

      <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2019-03-13 [bbb96c370] Allow ALTER TABLE .. SET NOT NULL to skip provably unnec
-->

       <para>
        Allow <link linkend="sql-altertable"><command>ALTER TABLE ... SET
        NOT NULL</command></link> to avoid unnecessary table scans (Sergei
        Kornilov)
       </para>

       <para>
        This can be optimized when the table's column constraints can be
        recognized as disallowing nulls.
       </para>
      </listitem>

      <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
2019-03-08 [3c5926301] Avoid some table rewrites for ALTER TABLE .. SET DATA TY
-->

       <para>
        Allow <command>ALTER TABLE ... SET DATA TYPE</command> changing between
        <type>timestamp</type> and <type>timestamptz</type> to avoid a
        table rewrite when the session time zone is <acronym>UTC</acronym>
        (Noah Misch)
       </para>

       <para>
        In the <acronym>UTC</acronym> time zone, these two data types are
        binary compatible.
       </para>
      </listitem>

      <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
2018-07-22 [86eaf208e] Hand code string to integer conversion for performance.
-->

       <para>
        Improve speed in converting strings to
        <type>int2</type> or <type>int4</type> integers (Andres Freund)
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2019-03-15 [bb16aba50] Enable parallel query with SERIALIZABLE isolation.
-->

       <para>
        Allow parallelized queries when in <link
        linkend="xact-serializable"><literal>SERIALIZABLE</literal></link>
        isolation mode (Thomas Munro)
       </para>

       <para>
        Previously, parallelism was disabled when in this mode.
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2018-11-07 [3fd2a7932] Provide pg_pread() and pg_pwrite() for random I/O.
Author: Thomas Munro <tmunro@postgresql.org>
2018-11-07 [c24dcd0cf] Use pg_pread() and pg_pwrite() for data files and WAL.
-->

       <para>
        Use <function>pread()</function> and <function>pwrite()</function>
        for random I/O (Oskari Saarenmaa, Thomas Munro)
       </para>

       <para>
        This reduces the number of system calls required for I/O.
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2018-07-24 [1bc180cd2] Use setproctitle_fast() to update the ps status, if avai
-->

       <para>
        Improve the speed of setting the <link
        linkend="guc-update-process-title">process title</link> on
        <systemitem class="osname">FreeBSD</systemitem> (Thomas Munro)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Monitoring</title>

     <itemizedlist>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-03 [799e22034] Log all statements from a sample of transactions
-->

       <para>
        Allow logging of statements from only a percentage of transactions
        (Adrien Nayrat)
       </para>

       <para>
        The parameter <xref linkend="guc-log-transaction-sample-rate"/>
        controls this.
       </para>
      </listitem>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-02 [ab0dfc961] Report progress of CREATE INDEX operations
Author: Peter Eisentraut <peter@eisentraut.org>
2019-04-07 [03f9e5cba] Report progress of REINDEX operations
-->

       <para>
        Add progress reporting to <command>CREATE INDEX</command> and
        <command>REINDEX</command> operations (Álvaro Herrera, Peter
        Eisentraut)
       </para>

       <para>
        Progress is reported in the <link
        linkend="create-index-progress-reporting"><structname>pg_stat_progress_create_index</structname></link>
        system view.
       </para>
      </listitem>

      <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2019-03-25 [6f97457e0] Add progress reporting for CLUSTER and VACUUM FULL.
-->

       <para>
        Add progress reporting to <command>CLUSTER</command> and
        <command>VACUUM FULL</command> (Tatsuro Yamada)
       </para>

       <para>
        Progress is reported in the <link
        linkend="cluster-progress-reporting"><structname>pg_stat_progress_cluster</structname></link>
        system view.
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-04-02 [280e5f140] Add progress reporting to pg_checksums
-->

       <para>
        Add progress reporting to <xref linkend="app-pgchecksums"/>
        (Michael Banck, Bernd Helmle)
       </para>

       <para>
        This is enabled with the option <option>--progress</option>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
2019-03-09 [6b9e875f7] Track block level checksum failures in pg_stat_database
-->

       <para>
        Add counter of checksum failures to
        <structname>pg_stat_database</structname> (Magnus Hagander)
       </para>
      </listitem>

      <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
2019-04-12 [77bd49adb] Show shared object statistics in pg_stat_database
-->

       <para>
        Add tracking of global objects in system view
        <structname>pg_stat_database</structname> (Julien Rouhaud)
       </para>

       <para>
        Global objects are shown with a <link
        linkend="pg-stat-database-view"><structname>pg_stat_database</structname></link>.<structfield>datid</structfield>
        value of zero.
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-10-09 [c48101620] Add pg_ls_archive_statusdir function
-->

       <para>
        Add the ability to list the contents of the archive directory
        (Christoph Moench-Tegeder)
       </para>

       <para>
        The function is <link
        linkend="functions-admin-genfile-table"><function>pg_ls_archive_statusdir()</function></link>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-10-05 [9cd92d1a3] Add pg_ls_tmpdir function
-->

       <para>
        Add the ability to list the contents of temporary directories
        (Nathan Bossart)
       </para>

       <para>
        The function, <link
        linkend="functions-admin-genfile-table"><function>pg_ls_tmpdir()</function></link>,
        optionally allows specification of a tablespace.
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-02-01 [f60a0e967] Add more columns to pg_stat_ssl
-->

       <para>
        Add information about the client certificate to the system view <link
        linkend="pg-stat-ssl-view"><structname>pg_stat_ssl</structname></link>
        (Peter Eisentraut)
       </para>

       <para>
        The new columns are <structfield>client_serial</structfield>
        and <structfield>issuer_dn</structfield>.  Column
        <structfield>clientdn</structfield> has been renamed to
        <structfield>client_dn</structfield> for clarity.
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-02-21 [f9692a769] Hide other user's pg_stat_ssl rows
-->

       <para>
        Restrict visibility of rows in <structname>pg_stat_ssl</structname>
        for unprivileged users (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-01-30 [689d15e95] Log PostgreSQL version number on startup
-->

       <para>
        At server start, emit a log message including the server
        version number (Christoph Berg)
       </para>
      </listitem>

      <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2019-03-06 [342cb650e] Don't log incomplete startup packet if it's empty
-->

       <para>
        Prevent logging <quote>incomplete startup packet</quote> if a new
        connection is immediately closed (Tom Lane)
       </para>

       <para>
        This avoids log spam from certain forms of monitoring.
       </para>
      </listitem>

      <listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
2018-09-28 [8bddc8640] Add application_name to connection authorized msg
-->

       <para>
        Include the <xref linkend="guc-application-name"/>, if set,
        in <xref linkend="guc-log-connections"/> log messages (Don Seiler)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-02-27 [6ae578a91] Set fallback_application_name for a walreceiver to clust
-->

       <para>
        Make the walreceiver set its application name to the cluster name,
        if set (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-12-09 [7fee252f6] Add timestamp of last received message from standby to p
-->

       <para>
        Add the timestamp of the last received standby message to <link
        linkend="pg-stat-replication-view"><structname>pg_stat_replication</structname></link>
        (Lim Myungkyu)
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-07-02 [c55de5e51] Add wait event for fsync of WAL segments
-->

       <para>
        Add a <link linkend="wait-event-table">wait event</link> for fsync
        of <acronym>WAL</acronym> segments (Konstantin Knizhnik)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title><acronym>Authentication</acronym></title>

     <itemizedlist>

      <listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
2019-04-03 [b0b39f72b] GSSAPI encryption support
-->

       <para>
        Add <link linkend="gssapi-auth"><acronym>GSSAPI</acronym></link>
        encryption support (Robbie Harwood, Stephen Frost)
       </para>

       <para>
        This feature allows TCP/IP connections to be encrypted when using
        GSSAPI authentication, without having to set up a separate
        encryption facility such as SSL.
        In support of this, add <literal>hostgssenc</literal>
        and <literal>hostnogssenc</literal> record types in <link
        linkend="auth-pg-hba-conf"><filename>pg_hba.conf</filename></link>
        for selecting connections that do or do not use GSSAPI encryption,
        corresponding to the existing <literal>hostssl</literal>
        and <literal>hostnossl</literal> record types.
        There is also a new <xref linkend="libpq-connect-gssencmode"/>
        libpq option, and a <xref linkend="pg-stat-gssapi-view"/> system
        view.
       </para>
      </listitem>

      <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
2019-03-09 [0516c61b7] Add new clientcert hba option verify-full
-->

       <para>
        Allow the <link
        linkend="auth-cert"><literal>clientcert</literal></link>
        <filename>pg_hba.conf</filename> option to check that the database
        user name matches the client certificate's common name
        (Julian Markwort, Marius Timmer)
       </para>

       <para>
        This new check is enabled with
        <literal>clientcert=verify-full</literal>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2019-03-21 [0f086f84a] Add DNS SRV support for LDAP server discovery.
-->

       <para>
        Allow discovery of an <link
        linkend="auth-ldap"><acronym>LDAP</acronym></link> server using
        <acronym>DNS SRV</acronym> records (Thomas Munro)
       </para>

       <para>
        This avoids the requirement of specifying
        <literal>ldapserver</literal>.  It is only supported if
        <productname>PostgreSQL</productname> is compiled with
        <productname>OpenLDAP</productname>.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Server Configuration</title>

     <itemizedlist>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-03-23 [ed308d783] Add options to enable and disable checksums in pg_checks
-->

       <para>
        Add ability to enable/disable cluster checksums using <xref
        linkend="app-pgchecksums"/> (Michael Banck, Michaël Paquier)
       </para>

       <para>
        The cluster must be shut down for these operations.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-10 [cbccac371] Reduce the default value of autovacuum_vacuum_cost_delay
-->

       <para>
        Reduce the default value of <xref
        linkend="guc-autovacuum-vacuum-cost-delay"/> to 2ms (Tom Lane)
       </para>

       <para>
        This allows autovacuum operations to proceed faster by default.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-10 [caf626b2c] Convert [autovacuum_]vacuum_cost_delay into floating-poi
-->

       <para>
        Allow <xref linkend="guc-vacuum-cost-delay"/> to specify
        sub-millisecond delays, by accepting fractional values (Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-10 [caf626b2c] Convert [autovacuum_]vacuum_cost_delay into floating-poi
-->

       <para>
        Allow time-based server parameters to use units of <link
        linkend="config-setting">microseconds</link>
        (<literal>us</literal>) (Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-11 [1a83a80a2] Allow fractional input values for integer GUCs, and impr
-->

       <para>
        Allow fractional input for integer server parameters (Tom Lane)
       </para>

       <para>
        For example, <command>SET work_mem = '30.1GB'</command> is now
        allowed, even though <varname>work_mem</varname> is an integer
        parameter.  The value will be rounded to an integer after any
        required units conversion.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-10 [caf626b2c] Convert [autovacuum_]vacuum_cost_delay into floating-poi
-->

       <para>
        Allow units to be defined for floating-point server parameters
        (Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2019-04-02 [475861b26] Add wal_recycle and wal_init_zero GUCs.
-->

       <para>
        Add <xref linkend="guc-wal-recycle"/> and <xref
        linkend="guc-wal-init-zero"/> server parameters to control
        <acronym>WAL</acronym> file recycling (Jerry Jelinek)
       </para>

       <para>
        Avoiding file recycling can be beneficial on copy-on-write file
        systems like <productname>ZFS</productname>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-04-06 [249d64999] Add support TCP user timeout in libpq and the backend se
-->

       <para>
        Add server parameter <xref linkend="guc-tcp-user-timeout"/> to
        control the server's <acronym>TCP</acronym> timeout (Ryohei Nagaura)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-20 [e73e67c71] Add settings to control SSL/TLS protocol version
-->

       <para>
        Allow control of the minimum and maximum <acronym>SSL</acronym>
        protocol versions (Peter Eisentraut)
       </para>

       <para>
        The server parameters are <xref
        linkend="guc-ssl-min-protocol-version"/> and <xref
        linkend="guc-ssl-max-protocol-version"/>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-07-30 [98efa76fe] Add ssl_library preset parameter
-->

       <para>
        Add server parameter <xref linkend="guc-ssl-library"/> to report
        the <acronym>SSL</acronym> library version used by the server
        (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2019-02-03 [f1bebef60] Add shared_memory_type GUC.
-->

       <para>
        Add server parameter <xref linkend="guc-shared-memory-type"/>
        to control the type of shared memory to use (Andres Freund)
       </para>

       <para>
        This allows selection of <productname>System V</productname>
        shared memory, if desired.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

   <sect3>
    <title>Streaming Replication and Recovery</title>

    <itemizedlist>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-02-07 [13b89f96d] Allow some recovery parameters to be changed with reload
-->

      <para>
       Allow some recovery parameters to be changed with reload (Peter
       Eisentraut)
      </para>

      <para>
       These parameters are <xref linkend="guc-archive-cleanup-command"/>,
       <xref linkend="guc-promote-trigger-file"/>, <xref
       linkend="guc-recovery-end-command"/>, and <xref
       linkend="guc-recovery-min-apply-delay"/>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-09-22 [db361db2f] Make GUC wal_sender_timeout user-settable
-->

      <para>
       Allow the streaming replication timeout (<xref
       linkend="guc-wal-sender-timeout"/>) to be set per connection
       (Takayuki Tsunakawa)
      </para>

      <para>
       Previously, this could only be set cluster-wide.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-10-25 [10074651e] Add pg_promote function
Author: Michael Paquier <michael@paquier.xyz>
2018-11-06 [8f045e242] Switch pg_promote to be parallel-safe
-->

      <para>
       Add function <link
       linkend="functions-recovery-control"><function>pg_promote()</function></link>
       to promote standbys to primaries (Laurenz Albe, Michaël Paquier)
      </para>

      <para>
       Previously, this operation was only possible by using <xref
       linkend="app-pg-ctl"/> or creating a trigger file.
      </para>
     </listitem>

     <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-04-05 [9f06d79ef] Add facility to copy replication slots
-->

      <para>
       Allow replication slots to be copied (Masahiko Sawada)
      </para>

      <para>
       The functions for this are <link
       linkend="functions-replication-table"><function>pg_copy_physical_replication_slot()</function></link>
       and <function>pg_copy_logical_replication_slot()</function>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-02-12 [ea92368cd] Move max_wal_senders out of max_connections for connecti
-->

      <para>
       Make <xref linkend="guc-max-wal-senders"/> not count as part of
       <xref linkend="guc-max-connections"/> (Alexander Kukushkin)
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-01-11 [ff8530605] Add value 'current' for recovery_target_timeline
-->

      <para>
       Add an explicit value of <literal>current</literal> for <xref
       linkend="guc-recovery-target-timeline"/> (Peter Eisentraut)
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-09-07 [8582b4d04] Improve handling of corrupted two-phase state files at r
-->

      <para>
       Make recovery fail if a <link
       linkend="sql-prepare-transaction">two-phase transaction</link>
       status file is corrupt (Michaël Paquier)
      </para>

      <para>
       Previously, a warning was logged and recovery continued,
       allowing the transaction to be lost.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Utility Commands</title>

    <itemizedlist>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-29 [5dc92b844] REINDEX CONCURRENTLY
-->

      <para>
       Add <xref linkend="sql-reindex"/> <literal>CONCURRENTLY</literal>
       option to allow reindexing without locking out writes (Michaël
       Paquier, Andreas Karlsson, Peter Eisentraut)
      </para>

      <para>
       This is also controlled by the <xref linkend="app-reindexdb"/>
       application's <option>--concurrently</option> option.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-30 [fc22b6623] Generated columns
-->

      <para>
       Add support for <link linkend="ddl-generated-columns">generated
       columns</link> (Peter Eisentraut)
      </para>

      <para>
       The content of generated columns are computed from expressions
       (including references to other columns in the same table)
       rather than being specified by <command>INSERT</command> or
       <command>UPDATE</command> commands.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2019-01-20 [31f381740] Allow COPY FROM to filter data using WHERE conditions
-->

      <para>
       Add a <literal>WHERE</literal> clause
       to <link linkend="sql-copy"><command>COPY FROM</command></link> to
       control which rows are accepted (Surafel Temesgen)
      </para>

      <para>
       This provides a simple way to filter incoming data.
      </para>
     </listitem>

     <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2018-10-09 [212fab992] Relax transactional restrictions on ALTER TYPE ... ADD V
-->

      <para>
       Allow enumerated values to be added more flexibly
       (Andrew Dunstan, Tom Lane, Thomas Munro)
      </para>

      <para>
       Previously, <link linkend="sql-altertype"><command>ALTER TYPE
       ... ADD VALUE</command></link> could not be called in a transaction
       block, unless it was part of the same transaction that created the
       enumerated type.  Now it can be called in a later transaction, so
       long as the new enumerated value is not referenced until after it is
       committed.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-24 [280a408b4] Transaction chaining
-->

      <para>
       Add commands to end a transaction and start a new one (Peter
       Eisentraut)
      </para>

      <para>
       The commands are <link linkend="sql-commit"><command>COMMIT AND
       CHAIN</command></link>
       and <link linkend="sql-rollback"><command>ROLLBACK AND
       CHAIN</command></link>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
2019-04-08 [119dcfad9] Add vacuum_truncate reloption.
Author: Fujii Masao <fujii@postgresql.org>
2019-05-08 [b84dbc8eb] Add TRUNCATE parameter to VACUUM.
-->

      <para>
       Add <xref linkend="sql-vacuum"/> and <command>CREATE
       TABLE</command> options to prevent <command>VACUUM</command>
       from truncating trailing empty pages (Takayuki Tsunakawa)
      </para>

      <para>
       These options are <varname>vacuum_truncate</varname> and
       <varname>toast.vacuum_truncate</varname>.  Use of these options
       reduces <command>VACUUM</command>'s locking requirements, but
       prevents returning disk space to the operating system.
      </para>
     </listitem>

     <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2019-04-04 [a96c41fee] Allow VACUUM to be run with index cleanup disabled.
Author: Michael Paquier <michael@paquier.xyz>
2019-06-25 [ce59b75d4] Add toast-level reloption for vacuum_index_cleanup
-->

      <para>
       Allow <command>VACUUM</command> to skip index cleanup
       (Masahiko Sawada)
      </para>

      <para>
       This change adds a <command>VACUUM</command> command
       option <literal>INDEX_CLEANUP</literal> as well as a table storage
       option <literal>vacuum_index_cleanup</literal>.  Use of this option
       reduces the ability to reclaim space and can lead to index bloat,
       but it is helpful when the main goal is to freeze old tuples.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-10-04 [803b1301e] Add option SKIP_LOCKED to VACUUM and ANALYZE
-->

      <para>
       Add the ability to skip <command>VACUUM</command> and
       <command>ANALYZE</command> operations on tables that cannot be
       locked immediately (Nathan Bossart)
      </para>

      <para>
       This option is called <literal>SKIP_LOCKED</literal>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
2019-03-29 [41b54ba78] Allow existing VACUUM options to take a Boolean argument
-->

      <para>
       Allow <command>VACUUM</command> and <command>ANALYZE</command>
       to take optional Boolean argument specifications (Masahiko Sawada)
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-08-10 [f841ceb26] Improve TRUNCATE by avoiding early lock queue
2018-08-27 [a556549d7] Improve VACUUM and ANALYZE by avoiding early lock queue
-->

      <para>
       Prevent <xref linkend="sql-truncate"/>,
       <command>VACUUM</command> and <command>ANALYZE</command>
       from requesting a lock on
       tables for which the user lacks permission (Michaël Paquier)
      </para>

      <para>
       This prevents unauthorized locking, which could interfere with
       user queries.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2019-04-04 [ea569d64a] Add SETTINGS option to EXPLAIN, to print modified settin
-->

      <para>
       Add <xref linkend="sql-explain"/> option
       <literal>SETTINGS</literal> to output non-default optimizer
       settings (Tomas Vondra)
      </para>

      <para>
       This output can also be obtained when using <xref linkend="auto-explain"/>
       by setting <varname>auto_explain.log_settings</varname>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
2019-03-19 [01bde4fa4] Implement OR REPLACE option for CREATE AGGREGATE.
-->

      <para>
       Add <literal>OR REPLACE</literal> option to
       <xref linkend="sql-createaggregate"/>
       (Andrew Gierth)
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-19 [590a87025] Ignore attempts to add TOAST table to shared or catalog
-->

      <para>
       Allow modifications of system catalogs' options using <xref
       linkend="sql-altertable"/> (Peter Eisentraut)
      </para>

      <para>
       Modifications of catalogs' <literal>reloptions</literal> and
       autovacuum settings are now supported.  (Setting <xref
       linkend="guc-allow-system-table-mods"/> is still required.)
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-13 [f177660ab] Include all columns in default names for foreign key con
-->

      <para>
       Use all key columns' names when selecting default constraint
       names for foreign keys (Peter Eisentraut)
      </para>

      <para>
       Previously, only the first column name was included in the constraint
       name, resulting in ambiguity for multi-column foreign keys.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Data Types</title>

    <itemizedlist>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-06-19 [d8594d123] Update list of combining characters
2019-06-24 [82be666ee] Update unicode_norm_table.h to Unicode 12.1.0
-->

      <para>
       Update assorted knowledge about Unicode to match Unicode 12.1.0
       (Peter Eisentraut)
      </para>

      <para>
       This fixes, for example, cases
       where <application>psql</application> would misformat output
       involving combining characters.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-24 [fd582317e] Sync our Snowball stemmer dictionaries with current upst
-->

      <para>
       Update Snowball stemmer dictionaries with support for new languages
       (Arthur Zakirov)
      </para>

      <para>
       This adds word stemming support for Arabic, Indonesian, Irish,
       Lithuanian, Nepali, and Tamil to <link linkend="textsearch">full
       text search</link>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-22 [5e1963fb7] Collations with nondeterministic comparison
-->

      <para>
       Allow creation of <link
       linkend="collation">collations</link> that report
       string equality for strings that are not bit-wise equal (Peter
       Eisentraut)
      </para>

      <para>
       This feature supports <quote>nondeterministic</quote> collations
       that can define case- and accent-agnostic equality comparisons.
       Thus, for example, a case-insensitive uniqueness constraint on a
       text column can be made more easily than before.  This is only
       supported for <acronym>ICU</acronym> collations.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-17 [b8f9a2a69] Add support for collation attributes on older ICU versio
-->

      <para>
       Add support for <acronym>ICU</acronym> collation attributes on older
       ICU versions (Peter Eisentraut)
      </para>

      <para>
       This allows customization of the collation rules in a consistent way
       across all ICU versions.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-19 [2ece7c07d] Add text-vs-name cross-type operators, and unify name_op
-->

      <para>
       Allow data
       type <link linkend="datatype-character-special-table">name</link>
       to more seamlessly be compared to other text types (Tom Lane)
      </para>

      <para>
       Type <type>name</type> now behaves much like a domain over
       type <type>text</type> that has default collation <quote>C</quote>.
       This allows cross-type comparisons to be processed more efficiently.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Functions</title>

    <itemizedlist>

     <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2019-03-16 [72b646033] Partial implementation of SQL/JSON path language
Author: Alexander Korotkov <akorotkov@postgresql.org>
2019-03-16 [16d489b0f] Numeric error suppression in jsonpath
Author: Alexander Korotkov <akorotkov@postgresql.org>
2019-04-01 [0a02e2ae0] GIN support for @@ and @? jsonpath operators
-->

      <para>
       Add support for the <acronym>SQL/JSON</acronym> <link
       linkend="functions-sqljson-path">path</link> language
       (Nikita Glukhov, Teodor Sigaev, Alexander Korotkov, Oleg Bartunov,
       Liudmila Mantrova)
      </para>

      <para>
       This allows execution of complex queries on <type>JSON</type>
       values using an <acronym>SQL</acronym>-standard language.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-12 [f1d85aa98] Add support for hyperbolic functions, as well as log10()
-->

      <para>
       Add support for <link linkend="functions-math-hyp-table">hyperbolic
       functions</link> (Lætitia Avrot)
      </para>

      <para>
       Also add <function>log10()</function> as an alias for
       <function>log()</function>, for standards compliance.
      </para>
     </listitem>

     <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2018-10-06 [e954a727f] Improve the accuracy of floating point statistical aggre
-->
      <para>
       Improve the accuracy of statistical aggregates like <link
       linkend="functions-aggregate-statistics-table"><function>variance()</function></link>
       by using more precise algorithms (Dean Rasheed)
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-11-14 [600b04d6b] Add a timezone-specific variant of date_trunc().
-->

      <para>
       Allow <link
       linkend="functions-datetime-table"><function>date_trunc()</function></link>
       to have an additional argument to control the time zone (Vik
       Fearing, Tom Lane)
      </para>

      <para>
       This is faster and simpler than using the <literal>AT TIME
       ZONE</literal> clause.
      </para>
     </listitem>

     <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2018-09-09 [cf9846724] Improve behavior of to_timestamp()/to_date() functions
-->

      <para>
       Adjust <link
       linkend="functions-formatting-table"><function>to_timestamp()</function></link>/<function>to_date()</function>
       functions to be more forgiving of template mismatches (Artur
       Zakirov, Alexander Korotkov, Liudmila Mantrova)
      </para>

      <para>
       This new behavior more closely matches the
       <productname>Oracle</productname> functions of the same name.
      </para>
     </listitem>

     <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-03-07 [251cf2e27] Fix minor deficiencies in XMLTABLE, xpath(), xmlexists()
-->

      <para>
       Fix assorted bugs in <link
       linkend="functions-xml"><acronym>XML</acronym> functions</link>
       (Pavel Stehule, Markus Winand, Chapman Flack)
      </para>

      <para>
       Specifically, in <literal>XMLTABLE</literal>,
       <function>xpath()</function>, and <function>xmlexists()</function>,
       fix some cases where nothing was output for a node, or an
       unexpected error was thrown, or necessary escaping of XML special
       characters was omitted.
      </para>
     </listitem>

     <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-03-07 [eaaa5986a] Fix the BY {REF,VALUE} clause of XMLEXISTS/XMLTABLE
-->

      <para>
       Allow the <literal>BY VALUE</literal> clause
       in <function>XMLEXISTS</function> and <function>XMLTABLE</function>
       (Chapman Flack)
      </para>

      <para>
       This SQL-standard clause has no effect
       in <productname>PostgreSQL</productname>'s implementation, but it
       was unnecessarily being rejected.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-03-27 [5bde1651b] Switch function current_schema[s]() to be parallel-unsaf
-->

      <para>
       Prevent <link
       linkend="functions-info-session-table"><function>current_schema()</function></link>
       and <function>current_schemas()</function> from being run by
       parallel workers, as they are not parallel-safe (Michaël Paquier)
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-01-30 [5f5c01459] Allow RECORD and RECORD[] to be specified in function co
-->

      <para>
       Allow <type>RECORD</type> and <type>RECORD[]</type> to be used
       as column types in a query's column definition list for a <link
       linkend="queries-tablefunctions">table function</link> that is declared
       to return <type>RECORD</type> (Elvis Pranskevichus)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title><link linkend="plpgsql">PL/pgSQL</link></title>

    <itemizedlist>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-01-04 [4879a5172] Support plpgsql variable names that conflict with unrese
-->

      <para>
       Allow SQL commands and variables with the same names as those
       commands to be used in the same PL/pgSQL function (Tom Lane)
      </para>

      <para>
       For example, allow a variable called <varname>comment</varname> to
       exist in a function that calls
       the <command>COMMENT</command> <acronym>SQL</acronym> command.
       Previously this combination caused a parse error.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2018-07-25 [167075be3] Add strict_multi_assignment and too_many_rows plpgsql ch
-->

      <para>
       Add new optional warning and error checks to PL/pgSQL (Pavel
       Stehule)
      </para>

      <para>
       The new checks allow for run-time validation of
       <literal>INTO</literal> column counts and single-row results.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Client Interfaces</title>

    <itemizedlist>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-04-06 [249d64999] Add support TCP user timeout in libpq and the backend se
-->

      <para>
       Add connection parameter <xref linkend="libpq-tcp-user-timeout"/>
       to control <application>libpq</application>'s <acronym>TCP</acronym>
       timeout (Ryohei Nagaura)
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-04-04 [7bac3acab] Add a "SQLSTATE-only" error verbosity option to libpq an
-->

      <para>
       Allow <application>libpq</application> (and thus
       <application>psql</application>) to report only the
       <literal>SQLSTATE</literal> value in error messages (Didier Gautheron)
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-11 [2970afa6c] Add PQresultMemorySize function to report allocated size
-->

      <para>
       Add <application>libpq</application>
       function <link linkend="libpq-pqresultmemorysize"><function>PQresultMemorySize()</function></link>
       to report the memory used by a query result (Lars Kanis, Tom Lane)
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-09-07 [1fea1e325] libpq: Change "options" dispchar to normal
-->

      <para>
       Remove the no-display/debug flag from <application>libpq</application>'s
       <literal>options</literal> connection parameter (Peter Eisentraut)
      </para>

      <para>
       This allows this parameter to be set by
       <application>postgres_fdw</application>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
2019-02-18 [050710b36] Add bytea datatype to ECPG.
-->

      <para>
       Allow <xref linkend="app-ecpg"/> to create variables of data type
       <type>bytea</type> (Ryo Matsumura)
      </para>

      <para>
       This allows ECPG clients to interact with <type>bytea</type> data
       directly, rather than using an encoded form.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
2019-05-22 [a1dc6ab46] Implement PREPARE AS statement for ECPG.
-->

      <para>
       Add <command>PREPARE AS</command> support to
       <productname>ECPG</productname> (Ryo Matsumura)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Client Applications</title>

    <itemizedlist>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-01-31 [00d1e88d3] Add - -min-xid-age and - -min-mxid-age options to vacuumdb
-->

      <para>
       Allow <xref linkend="app-vacuumdb"/> to select tables for vacuum
       based on their wraparound horizon (Nathan Bossart)
      </para>

      <para>
       The options are <option>--min-xid-age</option> and
       <option>--min-mxid-age</option>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-01-08 [354e95d1f] Add - -disable-page-skipping and - -skip-locked to vacuumd
-->

      <para>
       Allow <application>vacuumdb</application> to disable waiting for locks
       or skipping all-visible pages (Nathan Bossart)
      </para>

      <para>
       The options are <option>--skip-locked</option> and
       <option>--disable-page-skipping</option>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-04-01 [cc8d41511] Unified logging system for command-line programs
-->

      <para>
       Add colorization to the output of command-line utilities (Peter
       Eisentraut)
      </para>

      <para>
       This is enabled by setting the environment variable
       <envar>PG_COLOR</envar> to <literal>always</literal>
       or <literal>auto</literal>.  The specific colors used can be
       adjusted by setting the environment variable
       <envar>PG_COLORS</envar>, using ANSI escape codes for colors.
       For example, the default behavior is equivalent to
       <literal>PG_COLORS="error=01;31:warning=01;35:locus=01"</literal>.
      </para>
     </listitem>

     </itemizedlist>

    <sect4>
     <title><xref linkend="app-psql"/></title>

     <itemizedlist>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-11-26 [aa2ba50c2] Add CSV table output mode in psql.
-->

       <para>
        Add <acronym>CSV</acronym> table output mode in
        <application>psql</application> (Daniel Vérité)
       </para>

       <para>
        This is controlled by <command>\pset format csv</command> or the
        command-line <option>--csv</option> option.
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-11 [27f3dea64] psql: Add documentation URL to \help output
-->

       <para>
        Show the manual page <acronym>URL</acronym> in
        <application>psql</application>'s <command>\help</command> output
        for a SQL command (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2018-11-19 [6e5f8d489] psql: Show IP address in \conninfo
2019-06-14 [313f56ce2] Tweak libpq's PQhost, PQhostaddr, and psql's \connect
-->

       <para>
        Display the <acronym>IP</acronym> address in
        <application>psql</application>'s <command>\conninfo</command>
        (Fabien Coelho)
       </para>
      </listitem>

      <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-12-23 [11a60d496] Add completion for storage parameters after CREATE TABLE
Author: Michael Paquier <michael@paquier.xyz>
2018-10-26 [5953c9969] Improve tab completion of CREATE EVENT TRIGGER in psql
Author: Michael Paquier <michael@paquier.xyz>
2018-10-26 [292ef6e27] Add tab completion of EXECUTE FUNCTION for CREATE TRIGGE
Author: Michael Paquier <michael@paquier.xyz>
2019-01-28 [23349b18d] Add tab completion for ALTER INDEX ALTER COLUMN in psql
Author: Michael Paquier <michael@paquier.xyz>
2018-12-20 [4cba9c2a3] Add more tab completion for CREATE TABLE in psql
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-20 [a7c4dad1a] Fix psql's tab completion for ALTER DATABASE ... SET TAB
Author: Michael Paquier <michael@paquier.xyz>
2018-12-25 [f89ae34ab] Improve tab completion of ALTER INDEX/TABLE with SET STA
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-20 [c9a8a401f] Fix psql's tab completion for TABLE.
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-21 [121213d9d] Improve tab completion for ANALYZE, EXPLAIN, and VACUUM.
-->

       <para>
        Improve tab completion of <command>CREATE TABLE</command>,
        <command>CREATE TRIGGER</command>,
        <command>CREATE EVENT TRIGGER</command>,
        <command>ANALYZE</command>, <command>EXPLAIN</command>,
        <command>VACUUM</command>, <command>ALTER TABLE</command>,
        <command>ALTER INDEX</command>, <command>ALTER DATABASE</command>,
        and <command>ALTER INDEX ALTER COLUMN</command>
        (Dagfinn Ilmari Mannsåker, Tatsuro Yamada, Michaël Paquier,
        Tom Lane, Justin Pryzby)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title><link linkend="pgbench"><application>pgbench</application></link></title>

     <itemizedlist>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-01-10 [6260cc550] pgbench: add \cset and \gset commands
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-03-25 [25ee70511] pgbench: Remove \cset
-->

       <para>
        Allow values produced by queries to be assigned
        to <application>pgbench</application> variables (Fabien Coelho,
        Álvaro Herrera)
       </para>

       <para>
        The command for this is <command>\gset</command>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-25 [5b7e03670] Avoid unnecessary precision loss for pgbench's - -rate ta
-->

       <para>
        Improve precision of <application>pgbench</application>'s
        <option>--rate</option> option (Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-10-15 [5b75a4f82] pgbench: Report errors during run better
-->
       <para>
        Improve <application>pgbench</application>'s error reporting with
        clearer messages and return codes (Peter Eisentraut)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

   <sect3>
    <title>Server Applications</title>

    <itemizedlist>

     <listitem>
<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2018-09-01 [ec7436993] Implement "pg_ctl logrotate" command
-->

      <para>
       Allow control of log file rotation via <xref linkend="app-pg-ctl"/>
       (Kyotaro Horiguchi, Alexander Kuzmenkov, Alexander Korotkov)
      </para>

      <para>
       Previously, this was only possible via an <acronym>SQL</acronym>
       function or a process signal.
      </para>
     </listitem>

     <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2019-01-14 [bb24439ce] Detach postmaster process from pg_ctl's session at serve
-->

      <para>
       Properly detach the new server process
       during <literal><application>pg_ctl</application> start</literal>
       (Paul Guo)
      </para>

      <para>
       This prevents the server from being shut down if the shell script
       that invoked <application>pg_ctl</application> is interrupted later.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
2018-11-07 [3a769d823] pg_upgrade: Allow use of file cloning
-->

      <para>
       Allow <xref linkend="pgupgrade"/> to use the file system's cloning
       feature, if there is one (Peter Eisentraut)
      </para>

      <para>
       The <option>--clone</option> option has the advantages of
       <option>--link</option>, while preventing the old cluster from
       being changed after the new cluster has started.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-01 [2d34ad843] Add a - -socketdir option to pg_upgrade.
-->

      <para>
       Allow specification of the socket directory to use
       in <application>pg_upgrade</application> (Daniel Gustafsson)
      </para>

      <para>
       This is controlled by <option>--socketdir</option>; the default
       is the current directory.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-03-23 [e0090c869] Add option -N/- -no-sync to pg_checksums
-->

      <para>
       Allow <xref linkend="app-pgchecksums"/> to disable fsync operations
       (Michaël Paquier)
      </para>

      <para>
       This is controlled by the <option>--no-sync</option> option.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-07-10 [8a00b96aa] Add pg_rewind - -no-sync
-->

      <para>
       Allow <xref linkend="app-pgrewind"/> to disable fsync operations
       (Michaël Paquier)
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-09-14 [0ba06e0bf] Allow concurrent-safe open() and fopen() in frontend
2018-09-20 [40cfe8606] Enforce translation mode for Windows frontends to text
-->

      <para>
       Fix <xref linkend="pgtestfsync"/> to report accurate
       <literal>open_datasync</literal> durations on
       <productname>Windows</productname> (Laurenz Albe)
      </para>
     </listitem>

    </itemizedlist>

    <sect4>
     <title><link linkend="app-pgdump"><application>pg_dump</application></link>,
     <link linkend="app-pg-dumpall"><application>pg_dumpall</application></link>,
     <link linkend="app-pgrestore"><application>pg_restore</application></link></title>

     <itemizedlist>

      <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2019-03-07 [7e413a0f8] pg_dump: allow multiple rows per insert
2019-06-14 [a193cbec1] Add pg_dumpall rows-per-insert
-->

       <para>
        When <application>pg_dump</application> emits data
        with <command>INSERT</command> commands rather
        than <command>COPY</command>, allow more than one data row to be
        included in each <command>INSERT</command> (Surafel Temesgen,
        David Rowley)
       </para>

       <para>
        The option controlling this is <option>--rows-per-insert</option>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2018-07-13 [387a5cfb9] Add pg_dump - -on-conflict-do-nothing option.
-->

       <para>
        Allow <application>pg_dump</application> to emit <command>INSERT
        ... ON CONFLICT DO NOTHING</command> (Surafel Temesgen)
       </para>

       <para>
        This avoids conflict failures during restore.
        The option is <option>--on-conflict-do-nothing</option>.
       </para>
      </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-14 [548e50976] Improve parallel scheduling logic in pg_dump/pg_restore.
-->

       <para>
        Decouple the order of operations in a
        parallel <application>pg_dump</application> from the order used by
        a subsequent parallel <application>pg_restore</application> (Tom
        Lane)
       </para>

       <para>
        This allows <application>pg_restore</application> to perform
        more-fully-parallelized parallel restores, especially in cases
        where the original dump was not done in parallel.  Scheduling of a
        parallel <application>pg_dump</application> is also somewhat
        improved.
       </para>
      </listitem>

      <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2019-02-18 [af25bc03e] Provide an extra-float-digits setting for pg_dump / pg_d
-->

       <para>
        Allow the <xref linkend="guc-extra-float-digits"/> setting to be
        specified for <application>pg_dump</application> and
        <application>pg_dumpall</application> (Andrew Dunstan)
       </para>

       <para>
        This is primarily useful for making dumps that are exactly
        comparable across different source server versions.  It is not
        recommended for normal use, as it may result in loss of precision
        when the dump is restored.
       </para>
      </listitem>

      <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2019-03-01 [f092de050] Add - -exclude-database option to pg_dumpall
-->

       <para>
        Add <option>--exclude-database</option> option to
        <application>pg_dumpall</application> (Andrew Dunstan)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

   <sect3>
    <title>Source Code</title>

    <itemizedlist>

     <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
2018-11-16 [4da597edf] Make TupleTableSlots extensible, finish split of
Author: Andres Freund <andres@anarazel.de>
2019-03-06 [8586bf7ed] tableam: introduce table AM infrastructure.
Author: Andres Freund <andres@anarazel.de>
2019-03-06 [3b925e905] tableam: Add pg_dump support.
Author: Andres Freund <andres@anarazel.de>
2019-03-11 [c2fe139c2] tableam: Add and use scan APIs.
Author: Andres Freund <andres@anarazel.de>
2019-03-23 [5db6df0c0] tableam: Add tuple_{insert, delete, update, lock} and us
Author: Andres Freund <andres@anarazel.de>
2019-03-28 [d25f51910] tableam: relation creation, VACUUM FULL/CLUSTER, SET TAB
Author: Andres Freund <andres@anarazel.de>
2019-03-29 [d3a5fc17e] Show table access methods as such in psql's \dA.
Author: Andres Freund <andres@anarazel.de>
2019-03-31 [73c954d24] tableam: sample scan.
Author: Andres Freund <andres@anarazel.de>
2019-03-31 [bfbcad478] tableam: bitmap table scan.
existin
-->

      <para>
       Add <xref linkend="sql-create-access-method"/> command to create
       new table types (Andres Freund, Haribabu Kommi, Álvaro Herrera,
       Alexander Korotkov, Dmitry Dolgov)
      </para>

      <para>
       This enables the development of new <link linkend="tableam">table
       access methods</link>, which can optimize storage for different
       use cases.  The existing <literal>heap</literal> access method
       remains the default.
      </para>
     </listitem>

      <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
2019-02-11 [74dfe58a5] Allow extensions to generate lossy index conditions.
-->

       <para>
        Add <link linkend="xfunc-optimization">planner support
        function</link> interfaces to improve optimizer estimates,
        inlining, and indexing for functions (Tom Lane)
       </para>

       <para>
        This allows extensions to create planner support functions that
        can provide function-specific selectivity, cost, and row-count
        estimates that can depend on the function's arguments.  Support
        functions can also supply simplified representations and index
        conditions, greatly expanding optimization possibilities.
       </para>
      </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-12 [a6417078c] Create a script that can renumber manually-assigned OIDs
2019-03-12 [3aa0395d4] Remove remaining hard-wired OID references in the initia
-->

      <para>
       Simplify renumbering manually-assigned OIDs, and establish a new
       project policy for management of such OIDs (John Naylor, Tom Lane)
      </para>

      <para>
       Patches that manually assign OIDs for new built-in objects (such as
       new functions) should now randomly choose OIDs in the range
       8000&mdash;9999.  At the end of a development cycle, the OIDs used
       by committed patches will be renumbered down to lower numbers,
       currently somewhere in the 4<replaceable>xxx</replaceable> range,
       using the new <link
       linkend="system-catalog-oid-assignment"><command>renumber_oids.pl</command></link>
       script.  This approach should greatly reduce the odds of OID
       collisions between different in-process patches.
      </para>

      <para>
       While there is no specific policy reserving any OIDs for external
       use, it is recommended that forks and other projects needing
       private manually-assigned OIDs use numbers in the high
       7<replaceable>xxx</replaceable> range.  This will avoid conflicts
       with recently-merged patches, and it should be a long time before
       the core project reaches that range.
      </para>
     </listitem>

     <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2018-10-02 [a33245a85] Don't build static libraries on Cygwin
-->

      <para>
       Build <productname>Cygwin</productname> binaries using dynamic
       instead of static libraries (Marco Atzeri)
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-01-01 [1707a0d2a] Remove configure switch - -disable-strong-random
-->

      <para>
       Remove <application>configure</application> switch
       <option>--disable-strong-random</option> (Michaël Paquier)
      </para>

      <para>
       A strong random-number source is now required.
      </para>
     </listitem>

     <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-09-26 [96bf88d52] Always use our own versions of *printf().
2018-09-26 [26e9d4d4e] Convert elog.c's useful_strerror() into a globally-used
2018-09-26 [758ce9b77] Incorporate strerror_r() into src/port/snprintf.c, too.
2018-09-26 [d6c55de1f] Implement %m in src/port/snprintf.c, and teach elog.c to
-->

      <para>
       <function>printf</function>-family functions, as well
       as <function>strerror</function>
       and <function>strerror_r</function>, now behave uniformly across
       platforms within Postgres code (Tom Lane)
      </para>

      <para>
       Notably, <function>printf</function>
       understands <literal>%m</literal> everywhere; on
       Windows, <function>strerror</function> copes with Winsock error
       codes (it used to do so in backend but not frontend code);
       and <function>strerror_r</function> always follows the GNU return
       convention.
      </para>
     </listitem>

     <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
2018-08-23 [d9dd406fe] Require C99 (and thus MSCV 2013 upwards).
-->

      <para>
       Require a C99-compliant compiler, and <acronym>MSVC</acronym>
       2013 or later on <productname>Windows</productname> (Andres Freund)
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-01-11 [96b8b8b6f] Create INSTALL file using Pandoc
2019-03-27 [2488ea7a9] Use Pandoc also for plain-text documentation output
-->

      <para>
       Use <application>pandoc</application>,
       not <application>lynx</application>, for generating plain-text
       documentation output files (Peter Eisentraut)
      </para>

      <para>
       This affects only the <filename>INSTALL</filename> file generated
       during <literal>make dist</literal> and the seldom-used
       plain-text <filename>postgres.txt</filename> output file.
       Pandoc produces better output than lynx and avoids some
       locale/encoding issues.  Pandoc version 1.13 or later is required.
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2019-03-27 [ea55aec0a] doc: Add some images
-->

      <para>
       Support use of images in the <productname>PostgreSQL</productname>
       documentation (Jürgen Purtz)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Additional Modules</title>

    <itemizedlist>

     <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
2019-04-02 [ffab494a4] postgres_fdw: Perform the (ORDERED, NULL) upperrel opera
Author: Etsuro Fujita <efujita@postgresql.org>
2019-04-02 [d50d172e5] postgres_fdw: Perform the (FINAL, NULL) upperrel operati
-->

      <para>
       Allow <literal>ORDER BY</literal> sorts
       and <literal>LIMIT</literal> clauses to be pushed
       to <xref linkend="postgres-fdw"/> foreign servers in more
       cases (Etsuro Fujita)
      </para>
     </listitem>

     <listitem>
<!--
Author: Etsuro Fujita <efujita@postgresql.org>
2018-12-04 [f8f6e4467] postgres_fdw: Improve cost and size estimation for aggre
Author: Etsuro Fujita <efujita@postgresql.org>
2019-01-24 [fd1afdbaf] postgres_fdw: Account for tlist eval costs in estimate_p
Author: Etsuro Fujita <efujita@postgresql.org>
2019-05-09 [edbcbe277] postgres_fdw: Fix cost estimation for aggregate pushdown
-->

      <para>
       Improve optimizer cost accounting for
       <application>postgres_fdw</application> queries (Etsuro Fujita)
      </para>
     </listitem>

     <listitem>
<!--
Author: Jeff Davis <jdavis@postgresql.org>
2018-07-08 [a45adc747] Fix WITH CHECK OPTION on views referencing postgres_fdw
-->

      <para>
       Properly honor <literal>WITH CHECK OPTION</literal> on views
       that reference <application>postgres_fdw</application> tables
       (Etsuro Fujita)
      </para>

      <para>
       While <literal>CHECK OPTION</literal>s on
       <application>postgres_fdw</application> tables are ignored (because
       the reference is foreign), views on such tables are considered
       local, so this change enforces <literal>CHECK OPTION</literal>s
       on them.  Previously, only <command>INSERT</command>s and
       <command>UPDATE</command>s with <literal>RETURNING</literal>
       clauses that returned <literal>CHECK OPTION</literal> values
       were validated.
      </para>
     </listitem>

     <listitem>
<!--
Author: Amit Kapila <akapila@postgresql.org>
2019-01-11 [43cbedab8] Extend pg_stat_statements_reset to reset statistics spec
-->

      <para>
       Allow <link
       linkend="pgstatstatements"><function>pg_stat_statements_reset()</function></link>
       to be more granular (Haribabu Kommi, Amit Kapila)
      </para>

      <para>
       The function now allows reset of statistics for specific databases,
       users, and queries.
      </para>
     </listitem>

     <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2018-07-31 [2d36a5e9d] Provide a log_level setting for auto_explain
-->

      <para>
       Allow control of the <xref linkend="auto-explain"/> log level
       (Tom Dunstan, Andrew Dunstan)
      </para>

      <para>
       The default is <literal>LOG</literal>.
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2019-01-10 [e1c1d5444] Update unaccent rules with release 34 of CLDR for Latin-
-->

      <para>
       Update <xref linkend="unaccent"/> rules with new
       punctuation and symbols (Hugh Ranalli, Michaël Paquier)
      </para>
     </listitem>

     <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2019-02-01 [456e3718e] Add combining characters to unaccent.rules.
-->

      <para>
       Allow <application>unaccent</application> to handle some accents
       encoded as combining characters (Hugh Ranalli)
      </para>
     </listitem>

     <listitem>
<!--
Author: Thomas Munro <tmunro@postgresql.org>
2018-09-02 [5e8d670c3] Add Greek characters to unaccent.rules.
-->

      <para>
       Allow <application>unaccent</application> to remove accents from
       Greek characters (Tasos Maschalidis)
      </para>
     </listitem>

     <listitem>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
2019-03-20 [c1afd175b] Allow amcheck to re-find tuples using new search.
-->

      <para>
       Add a parameter to
       <xref linkend="amcheck"/>'s <function>bt_index_parent_check()</function>
       function to check each index tuple from the root of the tree
       (Peter Geoghegan)
      </para>
     </listitem>

     <listitem>
<!--
Author: Michael Paquier <michael@paquier.xyz>
2018-08-28 [1aaf532de] Rework option set of oid2name
Author: Michael Paquier <michael@paquier.xyz>
2018-08-28 [bfea331a5] Rework option set of vacuumlo
-->

      <para>
       Improve <xref linkend="oid2name"/> and <xref linkend="vacuumlo"/>
       option handling to match other commands (Tatsuro Yamada)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

  </sect2>

  <sect2 id="release-12-acknowledgements">
   <title>Acknowledgments</title>

   <para>
    The following individuals (in alphabetical order) have contributed to this
    release as patch authors, committers, reviewers, testers, or reporters of
    issues.
   </para>

   <simplelist>
    <member>Abhijit Menon-Sen</member>
    <member>Achilleas Mantzios</member>
    <member>Adam Berlin</member>
    <member>Adam Bielanski</member>
    <member>Aditya Toshniwal</member>
    <member>Adrien Nayrat</member>
    <member>Alan Jackson</member>
    <member>Albert Schabhuetl</member>
    <member>Aleksander Alekseev</member>
    <member>Alex Aktsipetrov</member>
    <member>Alex Kliukin</member>
    <member>Alex Macy</member>
    <member>Alexander Korotkov</member>
    <member>Alexander Kukushkin</member>
    <member>Alexander Kuzmenkov</member>
    <member>Alexander Lakhin</member>
    <member>Alexandra Ryzhevich</member>
    <member>Alexey Bashtanov</member>
    <member>Alexey Ermakov</member>
    <member>Alexey Kondratov</member>
    <member>Alexey Kryuchkov</member>
    <member>Alexey Stepanov</member>
    <member>Allison Kaptur</member>
    <member>Álvaro Herrera</member>
    <member>Alyssa Ross</member>
    <member>Amit Kapila</member>
    <member>Amit Khandekar</member>
    <member>Amit Langote</member>
    <member>Amul Sul</member>
    <member>Anastasia Lubennikova</member>
    <member>André Hänsel</member>
    <member>Andrea Gelmini</member>
    <member>Andreas Joseph Krogh</member>
    <member>Andreas Karlsson</member>
    <member>Andreas Kunert</member>
    <member>Andreas Scherbaum</member>
    <member>Andreas Seltenreich</member>
    <member>Andrei Yahorau</member>
    <member>Andres Freund</member>
    <member>Andrew Dunstan</member>
    <member>Andrew Fletcher</member>
    <member>Andrew Gierth</member>
    <member>Andrew Krasichkov</member>
    <member>Andrey Borodin</member>
    <member>Andrey Klychkov</member>
    <member>Andrey Lepikhov</member>
    <member>Andy Abelisto</member>
    <member>Anthony Greene</member>
    <member>Anthony Skorski</member>
    <member>Antonin Houska</member>
    <member>Arne Roland</member>
    <member>Arseny Sher</member>
    <member>Arthur Zakirov</member>
    <member>Ash Marath</member>
    <member>Ashutosh Bapat</member>
    <member>Ashutosh Sharma</member>
    <member>Ashwin Agrawal</member>
    <member>Aya Iwata</member>
    <member>Bartosz Polnik</member>
    <member>Basil Bourque</member>
    <member>Bernd Helmle</member>
    <member>Brad DeJong</member>
    <member>Brigitte Blanc-Lafay</member>
    <member>Bruce Klein</member>
    <member>Bruce Momjian</member>
    <member>Bruno Wolff</member>
    <member>Chapman Flack</member>
    <member>Chen Huajun</member>
    <member>Chris Travers</member>
    <member>Chris Wilson</member>
    <member>Christian Hofstaedtler</member>
    <member>Christoph Berg</member>
    <member>Christoph Moench-Tegeder</member>
    <member>Clemens Ladisch</member>
    <member>Colm McHugh</member>
    <member>Corey Huinker</member>
    <member>Craig Ringer</member>
    <member>Dagfinn Ilmari Mannsåker</member>
    <member>Daisuke Higuchi</member>
    <member>Daniel Fiori</member>
    <member>Daniel Gustafsson</member>
    <member>Daniel Vérité</member>
    <member>Daniel Westermann</member>
    <member>Daniel Wilches</member>
    <member>Darafei Praliaskouski</member>
    <member>Daryl Waycott</member>
    <member>Dave Cramer</member>
    <member>David Binderman</member>
    <member>David Fetter</member>
    <member>David G. Johnston</member>
    <member>David Rowley</member>
    <member>David Steele</member>
    <member>Davy Machado</member>
    <member>Dean Rasheed</member>
    <member>Derek Hans</member>
    <member>Derek Nelson</member>
    <member>Devrim Gündüz</member>
    <member>Dian Fay</member>
    <member>Didier Gautheron</member>
    <member>Dilip Kumar</member>
    <member>Dmitry Dolgov</member>
    <member>Dmitry Marakasov</member>
    <member>Dmitry Molotkov</member>
    <member>Dmitry Shalashov</member>
    <member>Don Seiler</member>
    <member>Donald Dong</member>
    <member>Doug Rady</member>
    <member>Edmund Horner</member>
    <member>Eduards Bezverhijs</member>
    <member>Elvis Pranskevichus</member>
    <member>Emanuel Araújo</member>
    <member>Emre Hasegeli</member>
    <member>Eric Cyr</member>
    <member>Erik Rijkers</member>
    <member>Ertugrul Kahveci</member>
    <member>Etsuro Fujita</member>
    <member>Eugen Konkov</member>
    <member>Euler Taveira</member>
    <member>Fabien Coelho</member>
    <member>Fabrízio de Royes Mello</member>
    <member>Feike Steenbergen</member>
    <member>Filip Rembialkowski</member>
    <member>Gaby Schilders</member>
    <member>Geert Lobbestael</member>
    <member>George Tarasov</member>
    <member>Georgios Kokolatos</member>
    <member>Gianni Ciolli</member>
    <member>Gilles Darold</member>
    <member>Greg Stark</member>
    <member>Grigory Smolkin</member>
    <member>Guillaume Lelarge</member>
    <member>Gunnlaugur Thor Briem</member>
    <member>Gurjeet Singh</member>
    <member>Hadi Moshayedi</member>
    <member>Hailong Li</member>
    <member>Hans Buschmann</member>
    <member>Haribabu Kommi</member>
    <member>Haruka Takatsuka</member>
    <member>Hayato Kuroda</member>
    <member>Heikki Linnakangas</member>
    <member>Hironobu Suzuki</member>
    <member>Hubert Lubaczewski</member>
    <member>Hugh Ranalli</member>
    <member>Ian Barwick</member>
    <member>Ibrar Ahmed</member>
    <member>Ildar Musin</member>
    <member>Insung Moon</member>
    <member>Ioseph Kim</member>
    <member>Isaac Morland</member>
    <member>Ivan Panchenko</member>
    <member>Jack Kelly</member>
    <member>Jacob Champion</member>
    <member>Jaime Casanova</member>
    <member>Jakob Egger</member>
    <member>Jakub Glapa</member>
    <member>Jakub Janecek</member>
    <member>James Coleman</member>
    <member>James Inform</member>
    <member>James Robinson</member>
    <member>James Sewell</member>
    <member>James Tomson</member>
    <member>Jan Chochol</member>
    <member>Jaroslav Sivy</member>
    <member>Jean-Christophe Arnu</member>
    <member>Jean-Marc Voillequin</member>
    <member>Jean-Pierre Pelletier</member>
    <member>Jeevan Chalke</member>
    <member>Jeevan Ladhe</member>
    <member>Jeff Davis</member>
    <member>Jeff Janes</member>
    <member>Jeremy Evans</member>
    <member>Jeremy Schneider</member>
    <member>Jeremy Smith</member>
    <member>Jerry Jelinek</member>
    <member>Jesper Pedersen</member>
    <member>Jianing Yang</member>
    <member>Jie Zhang</member>
    <member>Jim Nasby</member>
    <member>Jimmy Yih</member>
    <member>Joe Conway</member>
    <member>Joe Wildish</member>
    <member>Joerg Sonnenberger</member>
    <member>John Klann</member>
    <member>John Naylor</member>
    <member>Jonah Harris</member>
    <member>Jonathan S. Katz</member>
    <member>Jorge Gustavo Rocha</member>
    <member>José Arthur Benetasso Villanova</member>
    <member>Joshua D. Drake</member>
    <member>Juan José Santamaría Flecha</member>
    <member>Julian Hsiao</member>
    <member>Julian Markwort</member>
    <member>Julian Schauder</member>
    <member>Julien Rouhaud</member>
    <member>Jürgen Purtz</member>
    <member>Jürgen Strobel</member>
    <member>Justin Pryzby</member>
    <member>Kaiting Chen</member>
    <member>Karen Huddleston</member>
    <member>Karl Czajkowski</member>
    <member>Karl O. Pinc</member>
    <member>Keiichi Hirobe</member>
    <member>Keith Fiske</member>
    <member>Ken Tanzer</member>
    <member>Kenji Uno</member>
    <member>Kevin Grittner</member>
    <member>Kevin Hale Boyes</member>
    <member>Kieran McCusker</member>
    <member>Kirk Jamison</member>
    <member>Kohei KaiGai</member>
    <member>Konstantin Knizhnik</member>
    <member>Konstantin Kuznetsov</member>
    <member>Kristjan Tammekivi</member>
    <member>Kuntal Ghosh</member>
    <member>Kyle Samson</member>
    <member>Kyotaro Horiguchi</member>
    <member>Lætitia Avrot</member>
    <member>Lars Kanis</member>
    <member>Laurenz Albe</member>
    <member>Lim Myungkyu</member>
    <member>Liu Huailing</member>
    <member>Liudmila Mantrova</member>
    <member>Lloyd Albin</member>
    <member>Luca Ferrari</member>
    <member>Luis M. Carril</member>
    <member>Lukas Eder</member>
    <member>Lukas Fittl</member>
    <member>Madelaine Thibaut</member>
    <member>Madeleine Thompson</member>
    <member>Magnus Hagander</member>
    <member>Mahendra Singh</member>
    <member>Mai Peng</member>
    <member>Maksim Milyutin</member>
    <member>Maksym Boguk</member>
    <member>Malthe Borch</member>
    <member>Manuel Rigger</member>
    <member>Marco Atzeri</member>
    <member>Marco Slot</member>
    <member>Marina Polyakova</member>
    <member>Mario De Frutos Dieguez</member>
    <member>Marius Timmer</member>
    <member>Mark Chambers</member>
    <member>Mark Dilger</member>
    <member>Marko Tiikkaja</member>
    <member>Markus Winand</member>
    <member>Martín Marqués</member>
    <member>Masahiko Sawada</member>
    <member>Masao Fujii</member>
    <member>Mateusz Guzik</member>
    <member>Mathias Brossard</member>
    <member>Matt Williams</member>
    <member>Matthias Otterbach</member>
    <member>Matvey Arye</member>
    <member>Melanie Plageman</member>
    <member>Mi Tar</member>
    <member>Michael Banck</member>
    <member>Michael Davidson</member>
    <member>Michael Meskes</member>
    <member>Michael Paquier</member>
    <member>Michael Vitale</member>
    <member>Michel Pelletier</member>
    <member>Mikalai Keida</member>
    <member>Mike Palmiotto</member>
    <member>Mithun Cy</member>
    <member>Morgan Owens</member>
    <member>Murat Kabilov</member>
    <member>Nathan Bossart</member>
    <member>Nawaz Ahmed</member>
    <member>Neeraj Kumar</member>
    <member>Nick Barnes</member>
    <member>Nico Williams</member>
    <member>Nikita Glukhov</member>
    <member>Nikolay Shaplov</member>
    <member>Ning Yu</member>
    <member>Nishant Fnu</member>
    <member>Noah Misch</member>
    <member>Norbert Benkocs</member>
    <member>Noriyoshi Shinoda</member>
    <member>Oleg Bartunov</member>
    <member>Oleg Samoilov</member>
    <member>Oleksii Kliukin</member>
    <member>Ondrej Bouda</member>
    <member>Oskari Saarenmaa</member>
    <member>Pan Bian</member>
    <member>Patrick Francelle</member>
    <member>Patrick McHardy</member>
    <member>Paul A. Jungwirth</member>
    <member>Paul Bonaud</member>
    <member>Paul Guo</member>
    <member>Paul Martinez</member>
    <member>Paul Ramsey</member>
    <member>Paul Schaap</member>
    <member>Paul van der Linden</member>
    <member>Pavan Deolasee</member>
    <member>Pavel Oskin</member>
    <member>Pavel Raiskup</member>
    <member>Pavel Stehule</member>
    <member>Peifeng Qiu</member>
    <member>Peter Billen</member>
    <member>Peter Eisentraut</member>
    <member>Peter Geoghegan</member>
    <member>Peter Neave</member>
    <member>Petr Fedorov</member>
    <member>Petr Jelínek</member>
    <member>Petr Slavov</member>
    <member>Petru-Florin Mihancea</member>
    <member>Phil Bayer</member>
    <member>Phil Florent</member>
    <member>Philip Dubé</member>
    <member>Pierre Ducroquet</member>
    <member>Piotr Gabriel Kosinski</member>
    <member>Piotr Stefaniak</member>
    <member>Piotr Wlodarczyk</member>
    <member>Prabhat Sahu</member>
    <member>Quentin Rameau</member>
    <member>Rafael Castro</member>
    <member>Rafia Sabih</member>
    <member>Rahila Syed</member>
    <member>Rajkumar Raghuwanshi</member>
    <member>Rares Salcudean</member>
    <member>Raúl Marín Rodríguez</member>
    <member>Regina Obe</member>
    <member>Renaud Navarro</member>
    <member>Richard Guo</member>
    <member>Rick Otten</member>
    <member>Rikard Falkeborn</member>
    <member>RK Korlapati</member>
    <member>Robbie Harwood</member>
    <member>Robert Haas</member>
    <member>Robert Treat</member>
    <member>Robert Vollmert</member>
    <member>Roger Curley</member>
    <member>Roman Zharkov</member>
    <member>Ronan Dunklau</member>
    <member>Rui Hai Jiang</member>
    <member>Rushabh Lathia</member>
    <member>Ryan Lambert</member>
    <member>Ryo Matsumura</member>
    <member>Ryohei Nagaura</member>
    <member>Ryohei Takahashi</member>
    <member>Samuel Williams</member>
    <member>Sand Stone</member>
    <member>Sanyo Capobiango</member>
    <member>Satoru Koizumi</member>
    <member>Sean Johnston</member>
    <member>Serge Latyntsev</member>
    <member>Sergei Kornilov</member>
    <member>Sergey Pashkov</member>
    <member>Sergio Conde Gómez</member>
    <member>Shawn Debnath</member>
    <member>Shay Rojansky</member>
    <member>Sho Kato</member>
    <member>Shohei Mochizuki</member>
    <member>Shouyu Luo</member>
    <member>Simon Riggs</member>
    <member>Sivasubramanian Ramasubramanian</member>
    <member>Slawomir Chodnicki</member>
    <member>Stas Kelvish</member>
    <member>Stefan Kadow</member>
    <member>Stepan Yankevych</member>
    <member>Stephen Amell</member>
    <member>Stephen Frost</member>
    <member>Steve Rogerson</member>
    <member>Steve Singer</member>
    <member>Steven Winfield</member>
    <member>Surafel Temesgen</member>
    <member>Suraj Kharage</member>
    <member>Suresh Kumar R</member>
    <member>Takayuki Tsunakawa</member>
    <member>Takeshi Ideriha</member>
    <member>Takuma Hoshiai</member>
    <member>Tasos Maschalidis</member>
    <member>Tatsuo Ishii</member>
    <member>Tatsuro Yamada</member>
    <member>Teodor Sigaev</member>
    <member>Thom Brown</member>
    <member>Thomas Munro</member>
    <member>Thomas Poty</member>
    <member>Tillmann Schulz</member>
    <member>Tim Möhlmann</member>
    <member>Timur Birsh</member>
    <member>Tobias Bussmann</member>
    <member>Tom Cassidy</member>
    <member>Tom Dunstan</member>
    <member>Tom Gottfried</member>
    <member>Tom Lane</member>
    <member>Tomas Vondra</member>
    <member>Tushar Ahuja</member>
    <member>Ulf Adams</member>
    <member>Vaishnavi Prabakaran</member>
    <member>Victor Petrovykh</member>
    <member>Victor Wagner</member>
    <member>Victor Yegorov</member>
    <member>Vijaykumar Jain</member>
    <member>Vik Fearing</member>
    <member>Vlad Sterzhanov</member>
    <member>Vladimir Baranoff</member>
    <member>Vladimir Kriukov</member>
    <member>Wu Fei</member>
    <member>Yaroslav Schekin</member>
    <member>Yi Huang</member>
    <member>Yoshikazu Imai</member>
    <member>Yugo Nagata</member>
    <member>Yulian Khodorkovskiy</member>
    <member>Yuming Wang</member>
    <member>YunQiang Su</member>
    <member>Yuri Kurenkov</member>
    <member>Yusuke Egashira</member>
    <member>Yuzuko Hosoya</member>
    <member>Zhou Digoal</member>
   </simplelist>
  </sect2>

 </sect1>
