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 <sect1 id="release-10-3">
  <title>Release 10.3</title>

  <formalpara>
  <title>Release date:</title>
  <para>2018-03-01</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 10.2.
   For information about new features in major release 10, see
   <xref linkend="release-10">.
  </para>

  <sect2>
   <title>Migration to Version 10.3</title>

   <para>
    A dump/restore is not required for those running 10.X.
   </para>

   <para>
    However, if you run an installation in which not all users are mutually
    trusting, or if you maintain an application or extension that is
    intended for use in arbitrary situations, it is strongly recommended
    that you read the documentation changes described in the first changelog
    entry below, and take suitable steps to ensure that your installation or
    code is secure.
   </para>

   <para>
    Also, the changes described in the second changelog entry below may
    cause functions used in index expressions or materialized views to fail
    during auto-analyze, or when reloading from a dump.  After upgrading,
    monitor the server logs for such problems, and fix affected functions.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 10.2,
    see <xref linkend="release-10-2">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [5770172cb] 2018-02-26 07:39:44 -0800
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     <para>
      Document how to configure installations and applications to guard
      against search-path-dependent trojan-horse attacks from other users
      (Noah Misch)
     </para>

     <para>
      Using a <varname>search_path</varname> setting that includes any
      schemas writable by a hostile user enables that user to capture
      control of queries and then run arbitrary SQL code with the
      permissions of the attacked user.  While it is possible to write
      queries that are proof against such hijacking, it is notationally
      tedious, and it's very easy to overlook holes.  Therefore, we now
      recommend configurations in which no untrusted schemas appear in
      one's search path.  Relevant documentation appears in
      <xref linkend="ddl-schemas-patterns"> (for database administrators and users),
      <xref linkend="libpq-connect"> (for application authors),
      <xref linkend="extend-extensions-style">  (for extension authors), and
      <xref linkend="sql-createfunction"> (for authors
      of <literal>SECURITY DEFINER</literal> functions).
      (CVE-2018-1058)
     </para>
    </listitem>

    <listitem>
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Author: Noah Misch <noah@leadboat.com>
Branch: master [582edc369] 2018-02-26 07:39:44 -0800
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Author: Noah Misch <noah@leadboat.com>
Branch: REL9_4_STABLE [461c32b55] 2018-02-26 07:39:48 -0800
Branch: REL9_3_STABLE [de8ffd666] 2018-02-26 07:39:48 -0800
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3d2aed664] 2018-02-26 10:18:21 -0500
Branch: REL_10_STABLE [b8a2908f0] 2018-02-26 10:18:22 -0500
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-->
     <para>
      Avoid use of insecure <varname>search_path</varname> settings
      in <application>pg_dump</application> and other client programs
      (Noah Misch, Tom Lane)
     </para>

     <para>
      <application>pg_dump</application>,
      <application>pg_upgrade</application>,
      <application>vacuumdb</application> and
      other <productname>PostgreSQL</productname>-provided applications were
      themselves vulnerable to the type of hijacking described in the previous
      changelog entry; since these applications are commonly run by
      superusers, they present particularly attractive targets.  To make them
      secure whether or not the installation as a whole has been secured,
      modify them to include only the <structname>pg_catalog</structname>
      schema in their <varname>search_path</varname> settings.
      Autovacuum worker processes now do the same, as well.
     </para>

     <para>
      In cases where user-provided functions are indirectly executed by
      these programs &mdash; for example, user-provided functions in index
      expressions &mdash; the tighter <varname>search_path</varname> may
      result in errors, which will need to be corrected by adjusting those
      user-provided functions to not assume anything about what search path
      they are invoked under.  That has always been good practice, but now
      it will be necessary for correct behavior.
      (CVE-2018-1058)
     </para>
    </listitem>

    <listitem>
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Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [bc1adc651] 2018-02-23 22:13:21 -0500
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     <para>
      Prevent logical replication from trying to ship changes for
      unpublishable relations (Peter Eisentraut)
     </para>

     <para>
      A publication marked <literal>FOR ALL TABLES</literal> would
      incorrectly ship changes in materialized views
      and <structname>information_schema</structname> tables, which are
      supposed to be omitted from the change stream.
     </para>
    </listitem>

    <listitem>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [159efe4af] 2018-02-19 16:00:31 -0500
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     <para>
      Fix misbehavior of concurrent-update rechecks with CTE references
      appearing in subplans (Tom Lane)
     </para>

     <para>
      If a CTE (<literal>WITH</literal> clause reference) is used in an
      InitPlan or SubPlan, and the query requires a recheck due to trying
      to update or lock a concurrently-updated row, incorrect results could
      be obtained.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9afd513df] 2018-02-23 13:47:33 -0500
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     <para>
      Fix planner failures with overlapping mergejoin clauses in an outer
      join (Tom Lane)
     </para>

     <para>
      These mistakes led to <quote>left and right pathkeys do not match in
      mergejoin</quote> or <quote>outer pathkeys do not match
      mergeclauses</quote> planner errors in corner cases.
     </para>
    </listitem>

    <listitem>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [38b41f182] 2018-02-21 18:40:24 -0500
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     <para>
      Repair <application>pg_upgrade</application>'s failure to
      preserve <structfield>relfrozenxid</structfield> for materialized
      views (Tom Lane, Andres Freund)
     </para>

     <para>
      This oversight could lead to data corruption in materialized views
      after an upgrade, manifesting as <quote>could not access status of
      transaction</quote> or <quote>found xmin from before
      relfrozenxid</quote> errors.  The problem would be more likely to
      occur in seldom-refreshed materialized views, or ones that were
      maintained only with <command>REFRESH MATERIALIZED VIEW
      CONCURRENTLY</command>.
     </para>

     <para>
      If such corruption is observed, it can be repaired by refreshing the
      materialized view (without <literal>CONCURRENTLY</literal>).
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3486bcf9e] 2018-02-20 11:23:42 -0500
Branch: REL_10_STABLE [6753f6c41] 2018-02-20 11:23:34 -0500
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     <para>
      Fix incorrect <application>pg_dump</application> output for some
      non-default sequence limit values (Alexey Bashtanov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5c9f2564f] 2018-02-11 13:24:15 -0500
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     <para>
      Fix <application>pg_dump</application>'s mishandling
      of <literal>STATISTICS</literal> objects (Tom Lane)
     </para>

     <para>
      An extended statistics object's schema was mislabeled in the dump's
      table of contents, possibly leading to the wrong results in a
      schema-selective restore.  Its ownership was not correctly restored,
      either.  Also, change the logic so that statistics objects are
      dumped/restored, or not, as independent objects rather than tying
      them to the dump/restore decision for the table they are on.  The
      original definition could not scale to the planned future extension to
      cross-table statistics.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e748e902d] 2018-02-14 14:47:18 -0500
Branch: REL_10_STABLE [4081e1136] 2018-02-14 14:47:18 -0500
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     <para>
      Fix incorrect reporting of PL/Python function names in
      error <literal>CONTEXT</literal> stacks (Tom Lane)
     </para>

     <para>
      An error occurring within a nested PL/Python function call (that is,
      one reached via a SPI query from another PL/Python function) would
      result in a stack trace showing the inner function's name twice,
      rather than the expected results.  Also, an error in a nested
      PL/Python <literal>DO</literal> block could result in a null pointer
      dereference crash on some platforms.
     </para>
    </listitem>

    <listitem>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8af87f411] 2018-02-23 14:39:17 -0500
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     <para>
      Allow <filename>contrib/auto_explain</filename>'s
      <varname>log_min_duration</varname> setting to range up
      to <literal>INT_MAX</literal>, or about 24 days instead of 35 minutes
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [935dee9ad] 2018-02-09 15:54:45 -0500
Author: Andres Freund <andres@anarazel.de>
Branch: REL_10_STABLE [2ff2baa22] 2018-02-22 12:54:45 -0800
Branch: REL9_6_STABLE [83fce670e] 2018-02-22 12:58:43 -0800
-->
     <para>
      Mark assorted GUC variables as <literal>PGDLLIMPORT</literal>, to
      ease porting extension modules to Windows (Metin Doslu)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-10-2">
  <title>Release 10.2</title>

  <formalpara>
  <title>Release date:</title>
  <para>2018-02-08</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 10.1.
   For information about new features in major release 10, see
   <xref linkend="release-10">.
  </para>

  <sect2>
   <title>Migration to Version 10.2</title>

   <para>
    A dump/restore is not required for those running 10.X.
   </para>

   <para>
    However,
    if you use <filename>contrib/cube</filename>'s <literal>~&gt;</literal>
    operator, see the entry below about that.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 10.1,
    see <xref linkend="release-10-1">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3492a0af0] 2018-02-05 10:37:30 -0500
Branch: REL_10_STABLE [fe921a360] 2018-02-05 10:37:30 -0500
-->
     <para>
      Fix processing of partition keys containing multiple expressions
      (&Aacute;lvaro Herrera, David Rowley)
     </para>

     <para>
      This error led to crashes or, with carefully crafted input, disclosure
      of arbitrary backend memory.
      (CVE-2018-1052)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a926eb84e] 2018-02-05 10:58:27 -0500
Branch: REL_10_STABLE [6ba52aeb2] 2018-02-05 10:58:27 -0500
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     <para>
      Ensure that all temporary files made
      by <application>pg_upgrade</application> are non-world-readable
      (Tom Lane, Noah Misch)
     </para>

     <para>
      <application>pg_upgrade</application> normally restricts its
      temporary files to be readable and writable only by the calling user.
      But the temporary file containing <literal>pg_dumpall -g</literal>
      output would be group- or world-readable, or even writable, if the
      user's <literal>umask</literal> setting allows.  In typical usage on
      multi-user machines, the <literal>umask</literal> and/or the working
      directory's permissions would be tight enough to prevent problems;
      but there may be people using <application>pg_upgrade</application>
      in scenarios where this oversight would permit disclosure of database
      passwords to unfriendly eyes.
      (CVE-2018-1053)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [9c2f0a6c3] 2017-12-14 18:20:47 -0800
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     <para>
      Fix vacuuming of tuples that were updated while key-share locked
      (Andres Freund, &Aacute;lvaro Herrera)
     </para>

     <para>
      In some cases <command>VACUUM</command> would fail to remove such
      tuples even though they are now dead, leading to assorted data
      corruption scenarios.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [ad25a6b1f] 2018-02-01 15:23:45 -0500
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     <para>
      Fix failure to mark a hash index's metapage dirty after
      adding a new overflow page, potentially leading to index corruption
      (Lixian Zou, Amit Kapila)
     </para>
    </listitem>

    <listitem>
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Author: Robert Haas <rhaas@postgresql.org>
Branch: master [3b2787e1f] 2017-11-16 14:19:27 -0500
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     <para>
      Ensure that vacuum will always clean up the pending-insertions list of
      a GIN index (Masahiko Sawada)
     </para>

     <para>
      This is necessary to ensure that dead index entries get removed.
      The old code got it backwards, allowing vacuum to skip the cleanup if
      some other process were running cleanup concurrently, thus risking
      invalid entries being left behind in the index.
     </para>
    </listitem>

    <listitem>
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Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [272c2ab9f] 2018-01-09 17:06:31 -0300
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     <para>
      Fix inadequate buffer locking in some LSN fetches (Jacob Champion,
      Asim Praveen, Ashwin Agrawal)
     </para>

     <para>
      These errors could result in misbehavior under concurrent load.
      The potential consequences have not been characterized fully.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [90947674f] 2018-01-12 12:24:50 -0500
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     <para>
      Fix incorrect query results from cases involving flattening of
      subqueries whose outputs are used in <literal>GROUPING SETS</literal>
      (Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [3ccdc6f9a] 2018-01-31 15:43:11 -0500
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     <para>
      Fix handling of list partitioning constraints for partition keys of
      boolean or array types (Amit Langote)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [680d54050] 2018-01-12 15:46:37 -0500
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     <para>
      Avoid unnecessary failure in a query on an inheritance tree that
      occurs concurrently with some child table being removed from the tree
      by <command>ALTER TABLE NO INHERIT</command> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [54eff5311] 2018-01-02 19:16:16 -0300
Branch: REL_10_STABLE [6d2a9ae0e] 2018-01-02 19:16:16 -0300
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     <para>
      Fix spurious deadlock failures when multiple sessions are
      running <command>CREATE INDEX CONCURRENTLY</command> (Jeff Janes)
     </para>
    </listitem>

    <listitem>
<!--
Author: Teodor Sigaev <teodor@sigaev.ru>
Branch: master [ad337c76b] 2017-12-27 18:25:37 +0300
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     <para>
      During <command>VACUUM FULL</command>, update the table's size fields
      in <structname>pg_class</structname> sooner (Amit Kapila)
     </para>

     <para>
      This prevents poor behavior when rebuilding hash indexes on the
      table, since those use the <structname>pg_class</structname>
      statistics to govern the initial hash size.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c4c2885cb] 2017-12-22 12:08:06 -0500
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     <para>
      Fix
      <literal>UNION</literal>/<literal>INTERSECT</literal>/<literal>EXCEPT</literal>
      over zero columns (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [005ac298b] 2017-12-08 12:13:04 -0500
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     <para>
      Disallow identity columns on typed tables and partitions
      (Michael Paquier)
     </para>

     <para>
      These cases will be treated as unsupported features for now.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [2d2d06b7e] 2017-12-08 09:18:18 -0500
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     <para>
      Fix assorted failures to apply the correct default value when
      inserting into an identity column (Michael Paquier, Peter Eisentraut)
     </para>

     <para>
      In several contexts, notably <command>COPY</command>
      and <command>ALTER TABLE ADD COLUMN</command>, the expected default
      value was not applied and instead a null value was inserted.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9a785ad57] 2017-11-27 17:54:07 -0500
Branch: REL_10_STABLE [a57aa430b] 2017-11-27 17:54:09 -0500
Branch: REL9_6_STABLE [06ba53096] 2017-11-27 17:54:10 -0500
Branch: REL9_5_STABLE [39f180fdd] 2017-11-27 17:54:11 -0500
-->
     <para>
      Fix failures when an inheritance tree contains foreign child tables
      (Etsuro Fujita)
     </para>

     <para>
      A mix of regular and foreign tables in an inheritance tree resulted in
      creation of incorrect plans for <command>UPDATE</command>
      and <command>DELETE</command> queries.  This led to visible failures in
      some cases, notably when there are row-level triggers on a foreign
      child table.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9b63c13f0] 2017-11-25 14:15:48 -0500
Branch: REL_10_STABLE [5dc7faa91] 2017-11-25 14:15:48 -0500
Branch: REL9_6_STABLE [497e79b96] 2017-11-25 14:15:48 -0500
Branch: REL9_5_STABLE [ae6ed0784] 2017-11-25 14:15:48 -0500
Branch: REL9_4_STABLE [2e105cf6d] 2017-11-25 14:15:48 -0500
Branch: REL9_3_STABLE [d538f6568] 2017-11-25 14:15:48 -0500
-->
     <para>
      Repair failure with correlated sub-<literal>SELECT</literal>
      inside <literal>VALUES</literal> inside a <literal>LATERAL</literal>
      subquery (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bb94ce4d2] 2018-01-23 16:50:34 -0500
Branch: REL_10_STABLE [c5e59bb60] 2018-01-23 16:50:34 -0500
Branch: REL9_6_STABLE [ae3699a6a] 2018-01-23 16:50:35 -0500
Branch: REL9_5_STABLE [8a2228b2f] 2018-01-23 16:50:35 -0500
Branch: REL9_4_STABLE [54e1599c7] 2018-01-23 16:50:35 -0500
Branch: REL9_3_STABLE [b100a5274] 2018-01-23 16:50:35 -0500
-->
     <para>
      Fix <quote>could not devise a query plan for the given query</quote>
      planner failure for some cases involving nested <literal>UNION
      ALL</literal> inside a lateral subquery (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ecc27d55f] 2017-12-04 11:51:43 -0500
Branch: REL_10_STABLE [bf2b317f1] 2017-12-04 11:51:43 -0500
-->
     <para>
      Allow functional dependency statistics to be used for boolean columns
      (Tom Lane)
     </para>

     <para>
      Previously, although extended statistics could be declared and
      collected on boolean columns, the planner failed to apply them.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [df3a66e28] 2017-11-25 11:48:09 -0500
Branch: REL_10_STABLE [b9fc2d0b9] 2017-11-25 11:48:09 -0500
-->
     <para>
      Avoid underestimating the number of groups emitted by subqueries
      containing set-returning functions in their grouping columns (Tom Lane)
     </para>

     <para>
      Cases similar to <literal>SELECT DISTINCT unnest(foo)</literal> got a
      lower output rowcount estimate in 10.0 than they did in earlier
      releases, possibly resulting in unfavorable plan choices.  Restore the
      prior estimation behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Simon Riggs <simon@2ndQuadrant.com>
Branch: master [7e17a6889] 2017-11-22 16:28:14 +1100
Branch: REL_10_STABLE [7015bb389] 2017-11-28 09:37:22 +0000
-->
     <para>
      Fix use of triggers in logical replication workers (Petr Jelinek)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [df9f682c7] 2018-01-05 12:17:10 -0300
Branch: REL_10_STABLE [a19c262f3] 2018-01-05 12:17:10 -0300
Branch: REL9_6_STABLE [9a5e4a6e0] 2018-01-05 12:17:10 -0300
Branch: REL9_5_STABLE [132cd58d6] 2018-01-05 12:17:10 -0300
Branch: REL9_4_STABLE [f68c49f86] 2018-01-05 12:17:10 -0300
-->
     <para>
      Fix logical decoding to correctly clean up disk files for crashed
      transactions (Atsushi Torikoshi)
     </para>

     <para>
      Logical decoding may spill WAL records to disk for transactions
      generating many WAL records.  Normally these files are cleaned up
      after the transaction's commit or abort record arrives; but if
      no such record is ever seen, the removal code misbehaved.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [0fedb4ea6] 2017-12-14 11:13:14 -0500
Branch: REL_10_STABLE [14c15b1f4] 2017-12-14 11:29:34 -0500
Branch: REL9_6_STABLE [c28e0b1e0] 2017-12-14 11:31:13 -0500
Branch: REL9_5_STABLE [87056267e] 2017-12-14 11:32:00 -0500
Branch: REL9_4_STABLE [f5c7e0cdd] 2017-12-14 11:32:25 -0500
-->
     <para>
      Fix walsender timeout failure and failure to respond to interrupts
      when processing a large transaction (Petr Jelinek)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8a906204a] 2018-01-09 12:09:30 -0500
Branch: REL_10_STABLE [1f5adbd79] 2018-01-09 12:09:30 -0500
-->
     <para>
      Fix race condition during replication origin drop that could allow the
      dropping process to wait indefinitely (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Simon Riggs <simon@2ndQuadrant.com>
Branch: master [6668a54eb] 2018-01-06 11:48:21 +0000
Branch: REL_10_STABLE [76e117dbe] 2018-01-28 16:14:31 +0000
-->
     <para>
      Allow members of the <literal>pg_read_all_stats</literal> role to see
      walsender statistics in the <structname>pg_stat_replication</structname>
      view (Feike Steenbergen)
     </para>
    </listitem>

    <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [d02974e32] 2017-12-29 16:28:32 +0100
Branch: REL_10_STABLE [b38c3d58e] 2017-12-29 16:22:43 +0100
-->
     <para>
      Show walsenders that are sending base backups as active in
      the <structname>pg_stat_activity</structname> view (Magnus Hagander)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [38d485fda] 2018-01-30 16:50:30 -0500
Branch: REL_10_STABLE [167a22b2a] 2018-01-30 17:05:35 -0500
-->
     <para>
      Fix reporting of <literal>scram-sha-256</literal> authentication
      method in the <structname>pg_hba_file_rules</structname> view
      (Michael Paquier)
     </para>

     <para>
      Previously this was printed as <literal>scram-sha256</literal>,
      possibly confusing users as to the correct spelling.
     </para>
    </listitem>

    <listitem>
<!--
Author: Joe Conway <mail@joeconway.com>
Branch: master [752714dd9] 2017-11-26 09:49:40 -0800
Branch: REL_10_STABLE [9e051b674] 2017-11-26 09:50:00 -0800
Branch: REL9_6_STABLE [997015ef2] 2017-11-26 09:50:15 -0800
Branch: REL9_5_STABLE [db714c62b] 2017-11-26 09:50:27 -0800
Branch: REL9_4_STABLE [d8d9c97cd] 2017-11-26 09:50:42 -0800
Branch: REL9_3_STABLE [69e5b1e9c] 2017-11-26 09:50:53 -0800
-->
     <para>
      Fix <function>has_sequence_privilege()</function> to
      support <literal>WITH GRANT OPTION</literal> tests,
      as other privilege-testing functions do (Joe Conway)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [2918fcedb] 2017-11-11 11:10:53 -0800
Branch: REL_10_STABLE [30a5e940a] 2017-11-11 11:11:15 -0800
Branch: REL9_6_STABLE [46fb15f48] 2017-11-11 11:11:19 -0800
Branch: REL9_5_STABLE [e7083dfce] 2017-11-11 11:11:21 -0800
Branch: REL9_4_STABLE [2f4061aff] 2017-11-11 11:11:24 -0800
Branch: REL9_3_STABLE [d8406b9de] 2017-11-11 11:11:28 -0800
Branch: master [4b865aee2] 2017-11-11 13:07:46 -0800
Branch: REL_10_STABLE [075ced2a4] 2017-11-11 13:07:54 -0800
Branch: REL9_6_STABLE [742471ef9] 2017-11-11 13:07:55 -0800
Branch: REL9_5_STABLE [739f1f6ac] 2017-11-11 13:07:55 -0800
Branch: REL9_4_STABLE [e48fb50d8] 2017-11-11 13:07:55 -0800
Branch: REL9_3_STABLE [f5260d5ad] 2017-11-11 13:07:55 -0800
-->
     <para>
      In databases using UTF8 encoding, ignore any XML declaration that
      asserts a different encoding (Pavel Stehule, Noah Misch)
     </para>

     <para>
      We always store XML strings in the database encoding, so allowing
      libxml to act on a declaration of another encoding gave wrong results.
      In encodings other than UTF8, we don't promise to support non-ASCII
      XML data anyway, so retain the previous behavior for bug compatibility.
      This change affects only <function>xpath()</function> and related
      functions; other XML code paths already acted this way.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [ae65f6066] 2017-11-21 13:56:24 -0500
Branch: REL_10_STABLE [5b2a87707] 2017-11-21 14:03:51 -0500
Branch: REL9_6_STABLE [7c84bc0b3] 2017-11-21 14:30:33 -0500
Branch: REL9_5_STABLE [c703aa625] 2017-11-21 14:34:26 -0500
Branch: REL9_4_STABLE [294136d42] 2017-11-21 14:38:29 -0500
Branch: REL9_3_STABLE [aa3a78c3d] 2017-11-21 14:45:29 -0500
-->
     <para>
      Provide for forward compatibility with future minor protocol versions
      (Robert Haas, Badrul Chowdhury)
     </para>

     <para>
      Up to now, <productname>PostgreSQL</productname> servers simply
      rejected requests to use protocol versions newer than 3.0, so that
      there was no functional difference between the major and minor parts
      of the protocol version number.  Allow clients to request versions 3.x
      without failing, sending back a message showing that the server only
      understands 3.0.  This makes no difference at the moment, but
      back-patching this change should allow speedier introduction of future
      minor protocol upgrades.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: REL_10_STABLE [218b024a7] 2017-12-08 10:17:46 -0500
-->
     <para>
      Allow a client that supports SCRAM channel binding (such as v11 or
      later <application>libpq</application>) to connect to a v10 server
      (Michael Paquier)
     </para>

     <para>
      v10 does not have this feature, and the connection-time negotiation
      about whether to use it was done incorrectly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [aced5a92b] 2018-01-05 19:21:30 -0500
Branch: REL_10_STABLE [1c77e9908] 2018-01-05 19:21:30 -0500
-->
     <para>
      Avoid live-lock in <function>ConditionVariableBroadcast()</function>
      (Tom Lane, Thomas Munro)
     </para>

     <para>
      Given repeatedly-unlucky timing, a process attempting to awaken all
      waiters for a condition variable could loop indefinitely.  Due to the
      limited usage of condition variables in v10, this affects only
      parallel index scans and some operations on replication slots.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [59d1e2b95] 2017-12-21 09:24:30 -0500
Branch: REL_10_STABLE [f3decdc94] 2017-12-21 09:24:48 -0500
-->
     <para>
      Clean up waits for condition variables correctly during subtransaction
      abort (Robert Haas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [80259d4db] 2018-01-09 12:34:57 -0500
Branch: REL_10_STABLE [d56a5f994] 2018-01-09 12:34:46 -0500
-->
     <para>
      Ensure that child processes that are waiting for a condition variable
      will exit promptly if the postmaster process dies (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [fd7c0fa73] 2017-12-18 12:22:31 -0500
Branch: REL_10_STABLE [b70ea4c75] 2017-12-18 12:31:10 -0500
-->
     <para>
      Fix crashes in parallel queries using more than one Gather node
      (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [884a60840] 2017-12-13 16:15:44 -0500
Branch: REL_10_STABLE [192ffe1cb] 2017-12-13 16:09:00 -0500
-->
     <para>
      Fix hang in parallel index scan when processing a deleted or half-dead
      index page (Amit Kapila)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [c6755e233] 2017-11-28 11:44:59 -0500
Branch: REL_10_STABLE [ec7629dfb] 2017-11-28 11:49:01 -0500
-->
     <para>
      Avoid crash if parallel bitmap heap scan is unable to allocate a
      shared memory segment (Robert Haas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [28724fd90] 2017-12-06 08:58:27 -0500
Branch: REL_10_STABLE [a8ef4e81e] 2017-12-06 09:01:21 -0500
Branch: REL9_6_STABLE [b75644066] 2017-12-06 09:04:02 -0500
Branch: REL9_5_STABLE [0426a77ce] 2017-12-06 09:06:25 -0500
Branch: REL9_4_STABLE [facd94e72] 2017-12-06 09:08:30 -0500
Branch: master [2badb5afb] 2018-01-23 11:03:03 -0500
Branch: REL_10_STABLE [383e4268f] 2018-01-23 11:13:42 -0500
Branch: REL9_6_STABLE [2843c01a5] 2018-01-23 11:13:50 -0500
-->
     <para>
      Cope with failure to start a parallel worker process
      (Amit Kapila, Robert Haas)
     </para>

     <para>
      Parallel query previously tended to hang indefinitely if a worker
      could not be started, as the result of <literal>fork()</literal>
      failure or other low-probability problems.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [445dbd82a] 2017-11-28 12:15:38 -0500
Branch: REL_10_STABLE [dba6e75c1] 2017-11-28 12:19:19 -0500
-->
     <para>
      Avoid unnecessary failure when no parallel workers can be obtained
      during parallel query startup (Robert Haas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [8526bcb2d] 2017-12-19 12:21:56 -0500
Branch: REL_10_STABLE [72567f617] 2017-12-19 12:44:21 -0500
Branch: REL9_6_STABLE [2157a61b5] 2018-01-04 12:46:00 -0500
-->
     <para>
      Fix collection of <command>EXPLAIN</command> statistics from parallel
      workers (Amit Kapila, Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [f94eec490] 2017-12-20 17:26:50 -0500
Branch: REL_10_STABLE [7be0d775a] 2017-12-20 17:27:25 -0500
-->
     <para>
      Ensure that query strings passed to parallel workers are correctly
      null-terminated (Thomas Munro)
     </para>

     <para>
      This prevents emitting garbage in postmaster log output from such
      workers.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [751804998] 2017-11-14 15:03:55 -0500
Branch: REL_10_STABLE [619a8c47d] 2017-11-14 17:49:49 -0500
Branch: REL9_6_STABLE [4a15f87d2] 2017-11-14 17:49:49 -0500
Branch: REL9_5_STABLE [d4e38489f] 2017-11-14 17:49:49 -0500
-->
     <para>
      Avoid unsafe alignment assumptions when working
      with <type>__int128</type> (Tom Lane)
     </para>

     <para>
      Typically, compilers assume that <type>__int128</type> variables are
      aligned on 16-byte boundaries, but our memory allocation
      infrastructure isn't prepared to guarantee that, and increasing the
      setting of MAXALIGN seems infeasible for multiple reasons.  Adjust the
      code to allow use of <type>__int128</type> only when we can tell the
      compiler to assume lesser alignment.  The only known symptom of this
      problem so far is crashes in some parallel aggregation queries.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [35a528062] 2018-01-28 13:39:07 -0500
Branch: REL_10_STABLE [1b2a3860d] 2018-01-28 13:39:07 -0500
Branch: REL9_6_STABLE [4e9fb4bfe] 2018-01-28 13:39:07 -0500
Branch: REL9_5_STABLE [e194f1383] 2018-01-28 13:39:07 -0500
Branch: REL9_4_STABLE [06efc5cf5] 2018-01-28 13:39:07 -0500
Branch: REL9_3_STABLE [c03fc8462] 2018-01-28 13:39:07 -0500
-->
     <para>
      Prevent stack-overflow crashes when planning extremely deeply
      nested set operations
      (<literal>UNION</literal>/<literal>INTERSECT</literal>/<literal>EXCEPT</literal>)
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2e668c522] 2018-01-27 13:52:24 -0500
Branch: REL_10_STABLE [78433f41f] 2018-01-27 13:52:24 -0500
-->
     <para>
      Avoid crash during an EvalPlanQual recheck of an indexscan that is the
      inner child of a merge join (Tom Lane)
     </para>

     <para>
      This could only happen during an update or <command>SELECT FOR
      UPDATE</command> of a join, when there is a concurrent update of some
      selected row.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [414cd434f] 2017-11-28 23:40:11 -0300
Branch: REL_10_STABLE [d4607590b] 2017-11-28 23:42:42 -0300
-->
     <para>
      Fix crash in autovacuum when extended statistics are defined
      for a table but can't be computed (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [0c98d0dd5] 2017-11-10 14:21:32 -0500
Branch: REL_10_STABLE [f9e2885d5] 2017-11-10 14:27:51 -0500
Branch: REL9_6_STABLE [d380d080f] 2017-11-10 14:29:13 -0500
Branch: REL9_5_STABLE [9efd83bfd] 2017-11-10 14:30:06 -0500
Branch: REL9_4_STABLE [0bcdab58e] 2017-11-10 14:30:34 -0500
Branch: REL9_3_STABLE [62906461c] 2017-11-10 14:30:48 -0500
-->
     <para>
      Fix null-pointer crashes for some types of LDAP URLs appearing
      in <filename>pg_hba.conf</filename> (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [ab9f2c429] 2018-01-29 11:24:57 -0800
Branch: REL_10_STABLE [d1aac2998] 2018-01-29 11:24:57 -0800
Branch: master [c068f8772] 2018-01-29 11:24:57 -0800
Branch: REL_10_STABLE [d18d4bca8] 2018-01-29 11:24:57 -0800
Branch: REL_10_STABLE [c0fda304d] 2018-01-29 11:24:57 -0800
-->
     <para>
      Prevent out-of-memory failures due to excessive growth of simple hash
      tables (Tomas Vondra, Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3c1e9fd23] 2018-01-10 17:13:47 -0500
Branch: REL_10_STABLE [08adf688f] 2018-01-10 17:13:29 -0500
Branch: REL9_6_STABLE [122605194] 2018-01-10 17:13:29 -0500
Branch: REL9_5_STABLE [10bcd4165] 2018-01-10 17:13:29 -0500
Branch: REL9_4_STABLE [493cdc8ee] 2018-01-10 17:13:29 -0500
Branch: REL9_3_STABLE [45bfef7fb] 2018-01-10 17:13:29 -0500
-->
     <para>
      Fix sample <function>INSTR()</function> functions in the PL/pgSQL
      documentation (Yugo Nagata, Tom Lane)
     </para>

     <para>
      These functions are stated to
      be <trademark class="registered">Oracle</trademark> compatible, but
      they weren't exactly.  In particular, there was a discrepancy in the
      interpretation of a negative third parameter: Oracle thinks that a
      negative value indicates the last place where the target substring can
      begin, whereas our functions took it as the last place where the
      target can end.  Also, Oracle throws an error for a zero or negative
      fourth parameter, whereas our functions returned zero.
     </para>

     <para>
      The sample code has been adjusted to match Oracle's behavior more
      precisely.  Users who have copied this code into their applications
      may wish to update their copies.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2b792ab09] 2018-01-22 12:06:18 -0500
Branch: REL_10_STABLE [46246fd9d] 2018-01-22 12:06:18 -0500
Branch: REL9_6_STABLE [52cc1b484] 2018-01-22 12:06:19 -0500
Branch: REL9_5_STABLE [367e2b230] 2018-01-22 12:06:19 -0500
Branch: REL9_4_STABLE [da83ca7d9] 2018-01-22 12:06:19 -0500
Branch: REL9_3_STABLE [ef115621c] 2018-01-22 12:06:19 -0500
-->
     <para>
      Fix <application>pg_dump</application> to make ACL (permissions),
      comment, and security label entries reliably identifiable in archive
      output formats (Tom Lane)
     </para>

     <para>
      The <quote>tag</quote> portion of an ACL archive entry was usually
      just the name of the associated object.  Make it start with the object
      type instead, bringing ACLs into line with the convention already used
      for comment and security label archive entries.  Also, fix the
      comment and security label entries for the whole database, if present,
      to make their tags start with <literal>DATABASE</literal> so that they
      also follow this convention.  This prevents false matches in code that
      tries to identify large-object-related entries by seeing if the tag
      starts with <literal>LARGE OBJECT</literal>.  That could have resulted
      in misclassifying entries as data rather than schema, with undesirable
      results in a schema-only or data-only dump.
     </para>

     <para>
      Note that this change has user-visible results in the output
      of <command>pg_restore --list</command>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [3e68686e2] 2018-01-03 12:40:32 -0800
Branch: REL_10_STABLE [e3fdb7c00] 2018-01-03 12:39:59 -0800
Branch: REL9_6_STABLE [ceee51e38] 2018-01-03 12:39:59 -0800
Branch: REL9_5_STABLE [ea4cbf8f1] 2018-01-03 12:39:59 -0800
-->
     <para>
      Rename <application>pg_rewind</application>'s
      <function>copy_file_range</function> function to avoid conflict
      with new Linux system call of that name (Andres Freund)
     </para>

     <para>
      This change prevents build failures with newer glibc versions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [649aeb123] 2018-01-13 14:57:49 +0100
Branch: REL_10_STABLE [8b89b7aac] 2018-01-15 10:00:56 +0100
Branch: REL9_6_STABLE [f082ef836] 2018-01-15 10:01:15 +0100
Branch: REL9_5_STABLE [4eae1e6f5] 2018-01-15 10:02:03 +0100
Branch: REL9_4_STABLE [2c1c4b060] 2018-01-15 10:02:16 +0100
Branch: REL9_3_STABLE [a0f5890a6] 2018-01-15 10:02:23 +0100
-->
     <para>
      In <application>ecpg</application>, detect indicator arrays that do
      not have the correct length and report an error (David Rader)
     </para>
    </listitem>

    <listitem>
<!--
Author: Teodor Sigaev <teodor@sigaev.ru>
Branch: master [563a053bd] 2018-01-11 14:41:14 +0300
Branch: REL_10_STABLE [b8279a783] 2018-01-11 14:42:16 +0300
Branch: REL9_6_STABLE [bda5281fd] 2018-01-11 14:43:13 +0300
-->
     <para>
      Change the behavior of <filename>contrib/cube</filename>'s
      <type>cube</type> <literal>~&gt;</literal> <type>int</type>
      operator to make it compatible with KNN search (Alexander Korotkov)
     </para>

     <para>
      The meaning of the second argument (the dimension selector) has been
      changed to make it predictable which value is selected even when
      dealing with cubes of varying dimensionalities.
     </para>

     <para>
      This is an incompatible change, but since the point of the operator
      was to be used in KNN searches, it seems rather useless as-is.
      After installing this update, any expression indexes or materialized
      views using this operator will need to be reindexed/refreshed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d3f4e8a8a] 2017-11-25 14:42:10 -0500
Branch: REL_10_STABLE [ddba32005] 2017-11-25 14:42:25 -0500
Branch: REL9_6_STABLE [630aceda5] 2017-11-25 14:42:32 -0500
Branch: REL9_5_STABLE [47226971e] 2017-11-25 14:42:36 -0500
Branch: REL9_4_STABLE [5c38ddebd] 2017-11-25 14:42:41 -0500
Branch: REL9_3_STABLE [6e9ac0a2e] 2017-11-25 14:42:46 -0500
-->
     <para>
      Avoid triggering a libc assertion
      in <filename>contrib/hstore</filename>, due to use
      of <function>memcpy()</function> with equal source and destination
      pointers (Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [39cfe8619] 2018-01-04 14:59:00 -0500
Branch: REL_10_STABLE [5ad1b1728] 2018-01-04 14:59:00 -0500
Branch: REL9_6_STABLE [ad592f4a6] 2018-01-04 14:59:00 -0500
Branch: master [18869e202] 2018-01-04 16:00:21 -0500
Branch: REL_10_STABLE [0dc5dfcd7] 2018-01-04 15:59:30 -0500
-->
     <para>
      Fix incorrect display of tuples' null bitmaps
      in <filename>contrib/pageinspect</filename> (Maksim Milyutin)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [b0313f9cc] 2018-01-26 09:56:33 -0500
Branch: REL_10_STABLE [51fc1b09a] 2018-01-26 09:59:14 -0500
-->
     <para>
      Fix incorrect output from <filename>contrib/pageinspect</filename>'s
      <function>hash_page_items()</function> function (Masahiko Sawada)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [4bbf6edfb] 2018-01-17 16:18:39 -0500
Branch: REL_10_STABLE [3f05a30b5] 2018-01-17 16:57:53 -0500
Branch: REL9_6_STABLE [4a81c0229] 2018-01-17 17:09:20 -0500
Branch: master [99f6a17dd] 2018-01-30 14:44:30 -0500
Branch: REL_10_STABLE [92123c6ea] 2018-01-30 14:47:02 -0500
Branch: REL9_6_STABLE [d397f558d] 2018-01-30 14:55:14 -0500
-->
     <para>
      In <filename>contrib/postgres_fdw</filename>, avoid
      <quote>outer pathkeys do not match mergeclauses</quote>
      planner error when constructing a plan involving a remote join
      (Robert Haas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e9f2703ab] 2018-01-12 16:52:49 -0500
Branch: REL_10_STABLE [67854bc59] 2018-01-12 16:52:49 -0500
-->
     <para>
      In <filename>contrib/postgres_fdw</filename>, avoid planner failure
      when there are duplicate <literal>GROUP BY</literal> entries
      (Jeevan Chalke)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ac3b96268] 2017-11-17 12:46:52 -0500
Branch: REL_10_STABLE [6313995c2] 2017-11-17 12:47:11 -0500
Branch: REL9_6_STABLE [0d9243903] 2017-11-17 12:47:21 -0500
Branch: REL9_5_STABLE [9508d422b] 2017-11-17 12:47:29 -0500
Branch: REL9_4_STABLE [7d98dc133] 2017-11-17 12:47:36 -0500
Branch: REL9_3_STABLE [77b76fea9] 2017-11-17 12:47:44 -0500
-->
     <para>
      Provide modern examples of how to auto-start Postgres on macOS
      (Tom Lane)
     </para>

     <para>
      The scripts in <filename>contrib/start-scripts/osx</filename> use
      infrastructure that's been deprecated for over a decade, and which no
      longer works at all in macOS releases of the last couple of years.
      Add a new subdirectory <filename>contrib/start-scripts/macos</filename>
      containing scripts that use the newer <application>launchd</application>
      infrastructure.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [99d5a3ffb] 2018-01-03 15:36:54 -0500
Branch: REL_10_STABLE [0fb69340b] 2018-01-03 15:33:12 -0500
Branch: REL9_6_STABLE [85cdcde1f] 2018-01-03 15:33:32 -0500
Branch: REL9_5_STABLE [d329d2d3e] 2018-01-03 15:33:47 -0500
Branch: REL9_4_STABLE [2d03daa7b] 2018-01-03 15:34:02 -0500
Branch: REL9_3_STABLE [5404145c5] 2018-01-03 15:34:21 -0500
-->
     <para>
      Fix incorrect selection of configuration-specific libraries for
      OpenSSL on Windows (Andrew Dunstan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [84c4313c6] 2017-11-23 20:22:04 -0800
Branch: REL_10_STABLE [f16a0958d] 2017-11-23 20:22:24 -0800
Branch: REL9_6_STABLE [1695ce068] 2017-11-23 20:24:53 -0800
Branch: REL9_5_STABLE [da8eae56e] 2017-11-23 20:25:08 -0800
Branch: REL9_4_STABLE [558f62079] 2017-11-23 20:29:48 -0800
Branch: REL9_3_STABLE [83e6b1434] 2017-11-23 20:32:01 -0800
Branch: master [7e0c574ee] 2017-12-09 00:58:55 -0800
Branch: REL_10_STABLE [e2cc65050] 2017-12-09 00:58:58 -0800
Branch: REL9_6_STABLE [055532bad] 2017-12-09 00:58:58 -0800
Branch: REL9_5_STABLE [470de6a24] 2017-12-09 00:58:59 -0800
Branch: REL9_4_STABLE [d78c3ca0e] 2017-12-09 00:58:59 -0800
Branch: REL9_3_STABLE [70dc7ad58] 2017-12-09 00:58:59 -0800
-->
     <para>
      Support linking to MinGW-built versions of libperl (Noah Misch)
     </para>

     <para>
      This allows building PL/Perl with some common Perl distributions for
      Windows.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [65a00f303] 2017-12-08 18:06:05 -0800
Branch: REL_10_STABLE [9b5c99790] 2017-12-08 18:06:22 -0800
Branch: REL9_6_STABLE [140fa2fba] 2017-12-08 18:06:25 -0800
Branch: REL9_5_STABLE [1c1a572d0] 2017-12-08 18:06:29 -0800
Branch: REL9_4_STABLE [aed8d41af] 2017-12-08 18:13:49 -0800
Branch: REL9_3_STABLE [188689942] 2017-12-08 18:14:08 -0800
-->
     <para>
      Fix MSVC build to test whether 32-bit libperl
      needs <literal>-D_USE_32BIT_TIME_T</literal> (Noah Misch)
     </para>

     <para>
      Available Perl distributions are inconsistent about what they expect,
      and lack any reliable means of reporting it, so resort to a build-time
      test on what the library being used actually does.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [cbfffee41] 2017-11-12 14:31:00 -0800
Branch: REL_10_STABLE [d6387e27e] 2017-11-12 14:31:04 -0800
Branch: REL9_6_STABLE [8c92e66f1] 2017-11-12 14:31:04 -0800
Branch: REL9_5_STABLE [b2df91f2f] 2017-11-12 14:31:04 -0800
Branch: REL9_4_STABLE [e17b38db6] 2017-11-12 14:31:04 -0800
Branch: REL9_3_STABLE [1c065901e] 2017-11-12 14:31:05 -0800
-->
     <para>
      On Windows, install the crash dump handler earlier in postmaster
      startup (Takayuki Tsunakawa)
     </para>

     <para>
      This may allow collection of a core dump for some early-startup
      failures that did not produce a dump before.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [e02571b73] 2017-11-12 13:03:15 -0800
Branch: REL_10_STABLE [dcbec53f4] 2017-11-12 13:03:28 -0800
Branch: REL9_6_STABLE [fd5da32fc] 2017-11-12 13:03:28 -0800
Branch: REL9_5_STABLE [d74db7a35] 2017-11-12 13:03:28 -0800
Branch: REL9_4_STABLE [19cf9e96a] 2017-11-12 13:03:29 -0800
Branch: REL9_3_STABLE [30e99efe8] 2017-11-12 13:05:55 -0800
-->
     <para>
      On Windows, avoid encoding-conversion-related crashes when emitting
      messages very early in postmaster startup (Takayuki Tsunakawa)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [84669c9b0] 2017-11-20 18:05:17 -0500
Branch: REL_10_STABLE [ae772bbf9] 2017-11-20 18:05:02 -0500
Branch: REL9_6_STABLE [fa9a69d3d] 2017-11-20 18:05:02 -0500
Branch: REL9_5_STABLE [2cfafabe6] 2017-11-20 18:05:02 -0500
Branch: REL9_4_STABLE [13f2bdb63] 2017-11-20 18:05:03 -0500
Branch: REL9_3_STABLE [1056dd0e9] 2017-11-20 18:05:03 -0500
-->
     <para>
      Use our existing Motorola 68K spinlock code on OpenBSD as
      well as NetBSD (David Carlier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f3bd00c01] 2017-11-20 18:05:17 -0500
Branch: REL_10_STABLE [1ecf7eeb8] 2017-11-20 17:57:46 -0500
Branch: REL9_6_STABLE [940bafa75] 2017-11-20 17:57:46 -0500
Branch: REL9_5_STABLE [516cea4bb] 2017-11-20 17:57:46 -0500
Branch: REL9_4_STABLE [8bd8b4b77] 2017-11-20 17:57:46 -0500
Branch: REL9_3_STABLE [0245c75f4] 2017-11-20 17:57:46 -0500
-->
     <para>
      Add support for spinlocks on Motorola 88K (David Carlier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [41fc04ff9] 2018-01-27 16:42:28 -0500
Branch: REL_10_STABLE [2d71b2700] 2018-01-27 16:42:36 -0500
Branch: REL9_6_STABLE [462402be8] 2018-01-27 16:42:44 -0500
Branch: REL9_5_STABLE [b00e7555e] 2018-01-27 16:42:49 -0500
Branch: REL9_4_STABLE [fa86a32f9] 2018-01-27 16:42:55 -0500
Branch: REL9_3_STABLE [e5e2cc6f8] 2018-01-27 16:43:00 -0500
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2018c for DST law changes in Brazil, Sao Tome and Principe,
      plus historical corrections for Bolivia, Japan, and South Sudan.
      The <literal>US/Pacific-New</literal> zone has been removed (it was
      only an alias for <literal>America/Los_Angeles</literal> anyway).
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-10-1">
  <title>Release 10.1</title>

  <formalpara>
  <title>Release date:</title>
  <para>2017-11-09</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 10.0.
   For information about new features in major release 10, see
   <xref linkend="release-10">.
  </para>

  <sect2>
   <title>Migration to Version 10.1</title>

   <para>
    A dump/restore is not required for those running 10.X.
   </para>

   <para>
    However, if you use BRIN indexes, see the fourth changelog entry below.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [87b2ebd35] 2017-11-06 09:19:22 +0000
Branch: REL_10_STABLE [3f8089572] 2017-11-06 09:17:44 +0000
Branch: REL9_6_STABLE [1f23d1cd2] 2017-11-06 09:16:24 +0000
Branch: REL9_5_STABLE [045a18888] 2017-11-06 09:15:11 +0000
-->
     <para>
      Ensure that <literal>INSERT ... ON CONFLICT DO UPDATE</literal> checks
      table permissions and RLS policies in all cases (Dean Rasheed)
     </para>

     <para>
      The update path of <literal>INSERT ... ON CONFLICT DO UPDATE</literal>
      requires <literal>SELECT</literal> permission on the columns of the
      arbiter index, but it failed to check for that in the case of an
      arbiter specified by constraint name.
      In addition, for a table with row level security enabled, it failed to
      check updated rows against the table's <literal>SELECT</literal>
      policies (regardless of how the arbiter index was specified).
      (CVE-2017-15099)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b57422871] 2017-11-06 10:29:37 -0500
Branch: REL_10_STABLE [c30f082d2] 2017-11-06 10:29:38 -0500
Branch: REL9_6_STABLE [38e825632] 2017-11-06 10:29:39 -0500
Branch: REL9_5_STABLE [d5fe5fb23] 2017-11-06 10:29:40 -0500
Branch: REL9_4_STABLE [70846ee05] 2017-11-06 10:29:41 -0500
Branch: REL9_3_STABLE [c0c8807de] 2017-11-06 10:29:42 -0500
-->
     <para>
      Fix crash due to rowtype mismatch
      in <function>json{b}_populate_recordset()</function>
      (Michael Paquier, Tom Lane)
     </para>

     <para>
      These functions used the result rowtype specified in the <literal>FROM
      ... AS</literal> clause without checking that it matched the actual
      rowtype of the supplied tuple value.  If it didn't, that would usually
      result in a crash, though disclosure of server memory contents seems
      possible as well.
      (CVE-2017-15098)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [dfc015dcf] 2017-11-06 07:11:10 -0800
Branch: REL_10_STABLE [6b0b983f7] 2017-11-06 07:11:13 -0800
Branch: REL9_6_STABLE [b7d6f7507] 2017-11-06 07:11:13 -0800
Branch: REL9_5_STABLE [ed546dd06] 2017-11-06 07:11:13 -0800
Branch: REL9_4_STABLE [29d067051] 2017-11-06 07:11:13 -0800
Branch: REL9_3_STABLE [b50029768] 2017-11-06 07:11:13 -0800
Branch: REL9_2_STABLE [eda780281] 2017-11-06 07:11:13 -0800
-->
     <para>
      Fix sample server-start scripts to become <literal>$PGUSER</literal>
      before opening <literal>$PGLOG</literal> (Noah Misch)
     </para>

     <para>
      Previously, the postmaster log file was opened while still running as
      root.  The database owner could therefore mount an attack against
      another system user by making <literal>$PGLOG</literal> be a symbolic
      link to some other file, which would then become corrupted by appending
      log messages.
     </para>

     <para>
      By default, these scripts are not installed anywhere.  Users who have
      made use of them will need to manually recopy them, or apply the same
      changes to their modified versions.  If the
      existing <literal>$PGLOG</literal> file is root-owned, it will need to
      be removed or renamed out of the way before restarting the server with
      the corrected script.
      (CVE-2017-12172)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [ec42a1dcb] 2017-11-03 17:23:13 +0100
Branch: REL_10_STABLE [37a856567] 2017-11-03 17:23:13 +0100
Branch: REL9_6_STABLE [bd8e2b3cf] 2017-11-03 17:23:13 +0100
Branch: REL9_5_STABLE [cf0612aa2] 2017-11-03 17:23:13 +0100
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [1b890562b] 2017-11-03 20:45:36 +0100
Branch: REL_10_STABLE [b17870d75] 2017-11-03 20:47:44 +0100
-->
     <para>
      Fix BRIN index summarization to handle concurrent table extension
      correctly (&Aacute;lvaro Herrera)
     </para>

     <para>
      Previously, a race condition allowed some table rows to be omitted from
      the index.  It may be necessary to reindex existing BRIN indexes to
      recover from past occurrences of this problem.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [62a16572d] 2017-11-02 12:54:55 -0400
Branch: REL_10_STABLE [97ba7b8c8] 2017-11-02 12:54:22 -0400
Branch: REL9_6_STABLE [a43cd427e] 2017-11-02 12:54:23 -0400
Branch: REL9_5_STABLE [43276abc6] 2017-11-02 12:54:23 -0400
-->
     <para>
      Fix possible failures during concurrent updates of a BRIN index
      (Tom Lane)
     </para>

     <para>
      These race conditions could result in errors like <quote>invalid index
      offnum</quote> or <quote>inconsistent range map</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [a9fce6672] 2017-11-03 12:27:59 -0400
Branch: REL_10_STABLE [a14b52c61] 2017-11-03 12:28:08 -0400
-->
     <para>
      Prevent logical replication from setting non-replicated columns to
      nulls when replicating an <command>UPDATE</command> (Petr Jelinek)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [360fd1a7b] 2017-10-12 10:26:55 -0400
Branch: REL_10_STABLE [7cde649ab] 2017-10-12 10:26:54 -0400
-->
     <para>
      Fix logical replication to fire <literal>BEFORE ROW DELETE</literal>
      triggers when expected (Masahiko Sawada)
     </para>

     <para>
      Previously, that failed to happen unless the table also had
      a <literal>BEFORE ROW UPDATE</literal> trigger.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1518d0784] 2017-10-06 19:18:58 -0400
Branch: REL_10_STABLE [485d49dbc] 2017-10-06 19:18:58 -0400
Branch: REL9_6_STABLE [185279da3] 2017-10-06 19:18:58 -0400
Branch: REL9_5_STABLE [13d2ed921] 2017-10-06 19:18:59 -0400
Branch: REL9_4_STABLE [bfb69b1e5] 2017-10-06 19:18:59 -0400
-->
     <para>
      Fix crash when logical decoding is invoked from a SPI-using function,
      in particular any function written in a PL language
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7421f4b89] 2017-10-16 17:56:54 -0400
Branch: REL_10_STABLE [799037099] 2017-10-16 17:56:43 -0400
-->
     <para>
      Ignore CTEs when looking up the target table for
      <command>INSERT</command>/<command>UPDATE</command>/<command>DELETE</command>,
      and prevent matching schema-qualified target table names to trigger
      transition table names (Thomas Munro)
     </para>

     <para>
      This restores the pre-v10 behavior for CTEs attached to DML commands.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c3dfe0fec] 2017-10-16 15:24:36 -0400
Branch: REL_10_STABLE [72e9cc971] 2017-10-16 15:24:36 -0400
-->
     <para>
      Avoid evaluating an aggregate function's argument expression(s) at rows
      where its <literal>FILTER</literal> test fails (Tom Lane)
     </para>

     <para>
      This restores the pre-v10 (and SQL-standard) behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [08f1e1f0a] 2017-10-26 12:17:40 -0400
Branch: REL_10_STABLE [6a81ba1d4] 2017-10-26 12:17:40 -0400
Branch: REL9_6_STABLE [37b4e0fe9] 2017-10-26 12:17:40 -0400
-->
     <para>
      Fix incorrect query results when multiple <literal>GROUPING
      SETS</literal> columns contain the same simple variable (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a1c2c430d] 2017-10-06 14:28:42 -0400
Branch: REL_10_STABLE [0c25e9652] 2017-10-06 14:28:42 -0400
-->
     <para>
      Fix query-lifespan memory leakage while evaluating a set-returning
      function in a <command>SELECT</command>'s target list (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [682ce911f] 2017-10-27 22:22:39 +0200
Branch: REL_10_STABLE [a87c0c763] 2017-10-29 20:48:51 +0530
-->
     <para>
      Allow parallel execution of prepared statements with generic plans
      (Amit Kapila, Kuntal Ghosh)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [639c1a6bb] 2017-10-27 16:04:01 +0200
Branch: REL_10_STABLE [965a16fa9] 2017-10-27 16:04:10 +0200
Branch: REL9_6_STABLE [036b6bd50] 2017-10-27 16:12:16 +0200
-->
     <para>
      Fix incorrect parallelization decisions for nested queries
      (Amit Kapila, Kuntal Ghosh)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [846fcc851] 2017-10-29 12:58:40 +0530
Branch: REL_10_STABLE [69125c883] 2017-10-29 13:04:37 +0530
Branch: REL9_6_STABLE [f74f871b8] 2017-10-29 13:14:37 +0530
-->
     <para>
      Fix parallel query handling to not fail when a recently-used role is
      dropped (Amit Kapila)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [6393613b6] 2017-10-13 15:02:45 -0400
Branch: REL_10_STABLE [a3b1c2218] 2017-10-13 15:05:14 -0400
-->
     <para>
      Fix crash in parallel execution of a bitmap scan having a BitmapAnd
      plan node below a BitmapOr node (Dilip Kumar)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [f3c6e8a27] 2017-10-25 07:13:11 -0400
Branch: REL_10_STABLE [fb17082d7] 2017-10-25 07:14:21 -0400
Branch: REL9_6_STABLE [5c3a1bbb4] 2017-10-25 07:19:59 -0400
Branch: REL9_5_STABLE [5c8dcd322] 2017-10-25 07:20:37 -0400
Branch: REL9_4_STABLE [7f89fc418] 2017-10-25 07:20:48 -0400
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [18fc4ecf4] 2017-10-25 07:34:00 -0400
Branch: REL_10_STABLE [06d5ba0d4] 2017-10-25 07:40:33 -0400
Branch: REL9_6_STABLE [98efa5ebf] 2017-10-25 07:48:36 -0400
Branch: REL9_5_STABLE [3cc5f0550] 2017-10-25 07:49:13 -0400
Branch: REL9_4_STABLE [9cb28e98b] 2017-10-25 07:52:45 -0400
-->
     <para>
      Fix <function>json_build_array()</function>,
      <function>json_build_object()</function>, and their <type>jsonb</type>
      equivalents to handle explicit <literal>VARIADIC</literal> arguments
      correctly (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [be72b9c37] 2017-10-30 15:52:02 +0100
Branch: REL_10_STABLE [52ca7572c] 2017-10-30 15:52:13 +0100
-->
     <para>
      Fix autovacuum's <quote>work item</quote> logic to prevent possible
      crashes and silent loss of work items (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d5b760ecb] 2017-10-27 17:28:54 -0400
Branch: REL_10_STABLE [ddde3b4f3] 2017-10-27 17:10:21 -0400
Branch: REL9_6_STABLE [7e5e8b36d] 2017-10-27 17:10:21 -0400
Branch: REL9_5_STABLE [acd3287e4] 2017-10-27 17:10:21 -0400
Branch: REL9_4_STABLE [66104119e] 2017-10-27 17:10:21 -0400
Branch: REL9_3_STABLE [9d15b8b36] 2017-10-27 17:10:21 -0400
Branch: REL9_2_STABLE [80e79718d] 2017-10-27 17:10:21 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d76886c2d] 2017-10-27 18:16:24 -0400
Branch: REL_10_STABLE [291a31c42] 2017-10-27 18:16:25 -0400
Branch: REL9_6_STABLE [21daada10] 2017-10-27 18:16:25 -0400
Branch: REL9_5_STABLE [1f81c2cd5] 2017-10-27 18:16:25 -0400
Branch: REL9_4_STABLE [d01d97c25] 2017-10-27 18:16:25 -0400
Branch: REL9_3_STABLE [e06b9e9dc] 2017-10-27 18:16:25 -0400
Branch: REL9_2_STABLE [a4c11c103] 2017-10-27 18:16:25 -0400
-->
     <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 [f3ea3e3e8] 2017-10-23 13:57:45 -0400
Branch: REL_10_STABLE [df4aa6e4e] 2017-10-23 13:57:45 -0400
Branch: REL9_6_STABLE [285b850d5] 2017-10-23 13:57:45 -0400
Branch: REL9_5_STABLE [aa0518301] 2017-10-23 13:57:45 -0400
Branch: REL9_4_STABLE [d8a3be52f] 2017-10-23 13:57:45 -0400
Branch: REL9_3_STABLE [dde99de11] 2017-10-23 13:57:46 -0400
Branch: REL9_2_STABLE [900a9fd64] 2017-10-23 13:57:46 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6784d7a1d] 2017-10-27 12:19:09 -0400
Branch: REL_10_STABLE [8be102242] 2017-10-27 12:19:11 -0400
Branch: REL9_6_STABLE [cf0331a54] 2017-10-27 12:18:57 -0400
Branch: REL9_5_STABLE [37fb01cb0] 2017-10-27 12:18:57 -0400
Branch: REL9_4_STABLE [376ac922d] 2017-10-27 12:18:57 -0400
Branch: REL9_3_STABLE [be203c36a] 2017-10-27 12:18:57 -0400
Branch: REL9_2_STABLE [adcfa7bd1] 2017-10-27 12:18:57 -0400
-->
     <para>
      Record proper dependencies when a view or rule
      contains <structname>FieldSelect</structname>
      or <structname>FieldStore</structname> expression nodes (Tom Lane)
     </para>

     <para>
      Lack of these dependencies could allow a column or data
      type <command>DROP</command> to go through when it ought to fail,
      thereby causing later uses of the view or rule to get errors.
      This patch does not do anything to protect existing views/rules,
      only ones created in the future.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [36ea99c84] 2017-10-20 17:12:27 -0400
Branch: REL_10_STABLE [7a5f8de55] 2017-10-20 17:12:27 -0400
Branch: REL9_6_STABLE [b1752c3a7] 2017-10-20 17:12:27 -0400
Branch: REL9_5_STABLE [63fbc51e3] 2017-10-20 17:12:27 -0400
Branch: REL9_4_STABLE [d1ced6114] 2017-10-20 17:12:27 -0400
Branch: REL9_3_STABLE [7c70a129e] 2017-10-20 17:12:27 -0400
Branch: REL9_2_STABLE [0270ad1f7] 2017-10-20 17:12:28 -0400
-->
     <para>
      Correctly detect hashability of range data types (Tom Lane)
     </para>

     <para>
      The planner mistakenly assumed that any range type could be hashed
      for use in hash joins or hash aggregation, but actually it must check
      whether the range's subtype has hash support.  This does not affect any
      of the built-in range types, since they're all hashable anyway.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [e9ef11ac8] 2017-10-12 17:23:47 +0200
Branch: REL_10_STABLE [a01a3d931] 2017-10-12 17:32:48 +0200
-->
     <para>
      Correctly ignore <structname>RelabelType</structname> expression nodes
      when examining functional-dependency statistics (David Rowley)
     </para>

     <para>
      This allows, e.g., extended statistics on <type>varchar</type> columns
      to be used properly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [52328727b] 2017-10-11 22:18:10 -0400
Branch: REL_10_STABLE [604723d29] 2017-10-11 22:18:01 -0400
Branch: REL9_6_STABLE [96cfc7e19] 2017-10-11 22:18:01 -0400
-->
     <para>
      Prevent sharing transition states between ordered-set aggregates
      (David Rowley)
     </para>

     <para>
      This causes a crash with the built-in ordered-set aggregates, and
      probably with user-written ones as well.  v11 and later will include
      provisions for dealing with such cases safely, but in released
      branches, just disable the optimization.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [f67661665] 2017-10-11 14:02:41 -0700
Branch: REL_10_STABLE [61ace8fe7] 2017-10-11 14:02:41 -0700
Branch: REL9_6_STABLE [0da46d75e] 2017-10-11 14:02:41 -0700
-->
     <para>
      Prevent <varname>idle_in_transaction_session_timeout</varname> from
      being ignored when a <varname>statement_timeout</varname> occurred
      earlier (Lukas Fittl)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [118e99c3d] 2017-10-11 14:28:33 -0400
Branch: REL_10_STABLE [f4cdf781a] 2017-10-11 14:28:33 -0400
Branch: REL9_6_STABLE [36c687a22] 2017-10-11 14:28:33 -0400
Branch: REL9_5_STABLE [69bc245d9] 2017-10-11 14:28:33 -0400
Branch: REL9_4_STABLE [0e84f7075] 2017-10-11 14:28:33 -0400
Branch: REL9_3_STABLE [7573d122f] 2017-10-11 14:28:33 -0400
Branch: REL9_2_STABLE [525b09ada] 2017-10-11 14:28:34 -0400
-->
     <para>
      Fix low-probability loss of <command>NOTIFY</command> messages due to
      XID wraparound (Marko Tiikkaja, Tom Lane)
     </para>

     <para>
      If a session executed no queries, but merely listened for
      notifications, for more than 2 billion transactions, it started to miss
      some notifications from concurrently-committing transactions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [643c27e36] 2017-10-08 15:25:26 -0400
Branch: REL_10_STABLE [c3723317d] 2017-10-08 15:25:26 -0400
Branch: REL9_6_STABLE [13a8924ec] 2017-10-08 15:25:26 -0400
-->
     <para>
      Reduce the frequency of data flush requests during bulk file copies to
      avoid performance problems on macOS, particularly with its new APFS
      file system (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [bab3a714b] 2017-11-05 09:25:52 -0800
Branch: REL_10_STABLE [2168f37c4] 2017-11-05 09:25:59 -0800
Branch: REL9_6_STABLE [1cac62dac] 2017-11-05 09:26:28 -0800
Branch: REL9_5_STABLE [7932891ab] 2017-11-05 09:26:43 -0800
Branch: REL9_4_STABLE [2a2e2e85e] 2017-11-05 09:26:47 -0800
-->
     <para>
      Allow <command>COPY</command>'s <literal>FREEZE</literal> option to
      work when the transaction isolation level is <literal>REPEATABLE
      READ</literal> or higher (Noah Misch)
     </para>

     <para>
      This case was unintentionally broken by a previous bug fix.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [305cf1fd7] 2017-10-12 15:20:16 -0400
Branch: REL_10_STABLE [d48bf6a94] 2017-10-12 15:20:04 -0400
Branch: REL9_6_STABLE [aa1e9b3a4] 2017-10-12 15:20:04 -0400
-->
     <para>
      Fix <function>AggGetAggref()</function> to return the
      correct <structname>Aggref</structname> nodes to aggregate final
      functions whose transition calculations have been merged (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [080351466] 2017-10-31 13:40:23 -0400
Branch: REL_10_STABLE [9cf2b854a] 2017-10-31 13:40:23 -0400
Author: Noah Misch <noah@leadboat.com>
Branch: master [51f4d3ed7] 2017-11-01 19:16:14 -0700
Branch: REL_10_STABLE [f4e13963c] 2017-11-01 19:16:17 -0700
-->
     <para>
      Fix insufficient schema-qualification in some new queries
      in <application>pg_dump</application>
      and <application>psql</application>
      (Vitaly Burovoy, Tom Lane, Noah Misch)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [471d55859] 2017-10-22 16:45:16 -0400
Branch: REL_10_STABLE [852e3224e] 2017-10-22 16:45:26 -0400
-->
     <para>
      Avoid use of <literal>@&gt;</literal> operator
      in <application>psql</application>'s queries for <command>\d</command>
      (Tom Lane)
     </para>

     <para>
      This prevents problems when the <application>parray_gin</application>
      extension is installed, since that defines a conflicting operator.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [067a2259f] 2017-11-01 10:20:05 -0400
Branch: REL_10_STABLE [dd12b5307] 2017-11-01 21:41:45 -0400
Branch: REL9_6_STABLE [4ba0ffaae] 2017-11-01 21:44:55 -0400
Branch: REL9_5_STABLE [3064f0e25] 2017-11-01 21:45:11 -0400
-->
     <para>
      Fix <application>pg_basebackup</application>'s matching of tablespace
      paths to canonicalize both paths before comparing (Michael Paquier)
     </para>

     <para>
      This is particularly helpful on Windows.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [db6986f47] 2017-10-25 19:32:24 -0400
Branch: REL_10_STABLE [51e9fffba] 2017-10-25 19:32:24 -0400
Branch: REL9_6_STABLE [7dc66a2f6] 2017-10-25 19:32:24 -0400
Branch: REL9_5_STABLE [ee02c1c89] 2017-10-25 19:32:24 -0400
Branch: REL9_4_STABLE [9f7afb25b] 2017-10-25 19:32:24 -0400
Branch: REL9_3_STABLE [6dd7a1207] 2017-10-25 19:32:24 -0400
Branch: REL9_2_STABLE [caeae886e] 2017-10-25 19:32:25 -0400
-->
     <para>
      Fix <application>libpq</application> to not require user's home
      directory to exist (Tom Lane)
     </para>

     <para>
      In v10, failure to find the home directory while trying to
      read <filename>~/.pgpass</filename> was treated as a hard error,
      but it should just cause that file to not be found.  Both v10 and
      previous release branches made the same mistake when
      reading <filename>~/.pg_service.conf</filename>, though this was less
      obvious since that file is not sought unless a service name is
      specified.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [0af98a95c] 2017-10-26 10:16:04 +0200
Branch: REL_10_STABLE [65ba1b5c2] 2017-10-26 10:39:37 +0200
Branch: REL9_6_STABLE [41753604b] 2017-10-26 10:39:46 +0200
Branch: REL9_5_STABLE [9b01a21fc] 2017-10-26 10:39:54 +0200
Branch: REL9_4_STABLE [c6a396888] 2017-10-26 10:40:03 +0200
-->
     <para>
      In ecpglib, correctly handle backslashes in string literals depending
      on whether <varname>standard_conforming_strings</varname> is set
      (Tsunakawa Takayuki)
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [63d6b97fd] 2017-11-01 13:32:18 +0100
Branch: REL_10_STABLE [e4381c039] 2017-11-01 13:40:27 +0100
Branch: REL9_6_STABLE [e0ec1cbff] 2017-11-01 13:40:50 +0100
Branch: REL9_5_STABLE [d2e6bd13a] 2017-11-01 13:41:00 +0100
Branch: REL9_4_STABLE [18647e21d] 2017-11-01 13:41:12 +0100
Branch: REL9_3_STABLE [d64a4d368] 2017-11-01 13:41:21 +0100
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [6976a4f05] 2017-11-02 20:49:47 +0100
Branch: REL_10_STABLE [ee46980a7] 2017-11-02 20:51:00 +0100
Branch: REL9_6_STABLE [049dab009] 2017-11-02 20:51:13 +0100
Branch: REL9_5_STABLE [b6d95939e] 2017-11-02 20:51:23 +0100
Branch: REL9_4_STABLE [ad24e7bc2] 2017-11-02 20:51:34 +0100
Branch: REL9_3_STABLE [7a35507ac] 2017-11-02 20:51:44 +0100
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [7164991ca] 2017-11-03 11:15:14 +0100
Branch: REL_10_STABLE [c63568b06] 2017-11-03 12:41:39 +0100
Branch: REL9_6_STABLE [6cf68e223] 2017-11-03 12:41:23 +0100
Branch: REL9_5_STABLE [90d61bd1d] 2017-11-03 12:41:11 +0100
Branch: REL9_4_STABLE [946f16518] 2017-11-03 12:40:54 +0100
Branch: REL9_3_STABLE [deb429b51] 2017-11-03 12:40:42 +0100
-->
     <para>
      Make ecpglib's Informix-compatibility mode ignore fractional digits in
      integer input strings, as expected (Gao Zengqi, Michael Meskes)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [c66b438db] 2017-11-05 18:51:08 -0800
Branch: REL_10_STABLE [937f67800] 2017-11-05 18:51:15 -0800
Branch: REL9_6_STABLE [971983f42] 2017-11-05 18:52:38 -0800
Branch: REL9_5_STABLE [014c5cd87] 2017-11-05 18:54:52 -0800
-->
     <para>
      Fix missing temp-install prerequisites
      for <literal>check</literal>-like Make targets (Noah Misch)
     </para>

     <para>
      Some non-default test procedures that are meant to work
      like <literal>make check</literal> failed to ensure that the temporary
      installation was up to date.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8df4ce1ea] 2017-10-23 18:15:36 -0400
Branch: REL_10_STABLE [0cde56247] 2017-10-23 18:15:42 -0400
Branch: REL9_6_STABLE [fae550e52] 2017-10-23 18:15:47 -0400
Branch: REL9_5_STABLE [1e57d85cd] 2017-10-23 18:15:51 -0400
Branch: REL9_4_STABLE [ba67fac85] 2017-10-23 18:15:56 -0400
Branch: REL9_3_STABLE [da82bb1d8] 2017-10-23 18:16:00 -0400
Branch: REL9_2_STABLE [7e8d84c36] 2017-10-23 18:16:04 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</application>
      release 2017c for DST law changes in Fiji, Namibia, Northern Cyprus,
      Sudan, Tonga, and Turks &amp; Caicos Islands, plus historical
      corrections for Alaska, Apia, Burma, Calcutta, Detroit, Ireland,
      Namibia, and Pago Pago.
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [49df45acd] 2017-11-03 14:14:02 -0400
Branch: REL_10_STABLE [5159626af] 2017-11-03 14:14:16 -0400
-->
     <para>
      In the documentation, restore HTML anchors to being upper-case strings
      (Peter Eisentraut)
     </para>

     <para>
      Due to a toolchain change, the 10.0 user manual had lower-case strings
      for intrapage anchors, thus breaking some external links into our
      website documentation.  Return to our previous convention of using
      upper-case strings.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

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

  <formalpara>
   <title>Release date:</title>
   <para>2017-10-05</para>
  </formalpara>

  <sect2>
   <title>Overview</title>

   <para>
    Major enhancements in <productname>PostgreSQL</productname> 10 include:
   </para>

   <!-- Items in this list summarize one or more items below -->

   <itemizedlist>

   <listitem><para>Logical replication using publish/subscribe</para></listitem>
   <listitem><para>Declarative table partitioning</para></listitem>
   <listitem><para>Improved query parallelism</para></listitem>
   <listitem><para>Significant general performance improvements</para></listitem>
   <listitem><para>Stronger password authentication based on SCRAM-SHA-256</para></listitem>
   <listitem><para>Improved monitoring and control</para></listitem>
   </itemizedlist>

   <para>
    The above items are explained in more detail in the sections below.
   </para>

  </sect2>

  <sect2>

  <title>Migration to Version 10</title>

   <para>
    A dump/restore using <xref linkend="app-pg-dumpall">, or use of <xref
    linkend="pgupgrade">, is required for those wishing to migrate data
    from any previous release.
   </para>

   <para>
    Version 10 contains a number of changes that may affect compatibility
    with previous releases.  Observe the following incompatibilities:
   </para>

   <itemizedlist>

    <listitem>
<!--
2017-04-03 [ea69a0dea] Expand hash indexes more gradually.
2017-05-19 [a95410e2e] pg_upgrade: Handle hash index upgrades more smoothly.
2017-08-04 [620b49a16] hash: Increase the number of possible overflow bitmaps b
-->
     <para>
      Hash indexes must be rebuilt after <application>pg_upgrade</application>-ing
      from any previous major <productname>PostgreSQL</productname> version (Mithun
      Cy, Robert Haas, Amit Kapila)
     </para>

     <para>
      Major hash index improvements necessitated this requirement.
      <application>pg_upgrade</application> will create a script to assist with this.
     </para>
    </listitem>

    <listitem>
<!--
2016-10-20 [f82ec32ac] Rename "pg_xlog" directory to "pg_wal"
2017-03-17 [88e66d193] Rename "pg_clog" directory to "pg_xact".
-->
     <para>
      Rename write-ahead log directory <filename>pg_xlog</filename>
      to <link linkend="wal"><filename>pg_wal</filename></link>, and rename transaction
      status directory <filename>pg_clog</filename> to <filename>pg_xact</filename>
      (Michael Paquier)
     </para>

     <para>
      Users have occasionally thought that these directories contained only
      inessential log files, and proceeded to remove write-ahead log files
      or transaction status files manually, causing irrecoverable data
      loss.  These name changes are intended to discourage such errors in
      future.
     </para>
    </listitem>

    <listitem>
<!--
2017-02-09 [806091c96] Remove all references to "xlog" from SQL-callable functi
2017-02-09 [85c11324c] Rename user-facing tools with "xlog" in the name to say
2017-02-09 [62e8b3875] Rename command line options for ongoing xlog -> wal conv
2017-02-15 [0dfa89ba2] Replace reference to "xlog-method" with "wal-method" in
-->
     <para>
      Rename <acronym>SQL</acronym> functions, tools, and options that reference
      <quote>xlog</quote> to <quote>wal</quote> (Robert Haas)
     </para>

     <para>
      For example, <function>pg_switch_xlog()</function> becomes
      <function>pg_switch_wal()</function>, <application>pg_receivexlog</application>
      becomes <application>pg_receivewal</application>, and <option>--xlogdir</option>
      becomes <option>--waldir</option>.  This is for consistency with the
      change of the <filename>pg_xlog</filename> directory name; in general,
      the <quote>xlog</quote> terminology is no longer used in any user-facing
      places.
     </para>
    </listitem>

    <listitem>
<!--
2017-05-11 [d10c626de] Rename WAL-related functions and views to use "lsn" not
-->
     <para>
      Rename <acronym>WAL</acronym>-related functions and views to use <literal>lsn</literal>
      instead of <literal>location</literal> (David Rowley)
     </para>

     <para>
      There was previously an inconsistent mixture of the two terminologies.
     </para>
    </listitem>

    <listitem>
<!--
2017-01-16 [d43a619c6] Fix check_srf_call_placement() to handle VALUES cases co
2017-01-18 [69f4b9c85] Move targetlist SRF handling from expression evaluation
2017-01-18 [f13a1277a] Doc: improve documentation of new SRF-in-tlist behavior.
2017-06-13 [0436f6bde] Disallow set-returning functions inside CASE or COALESCE
-->
     <para>
      Change the implementation of set-returning functions appearing in
      a query's <literal>SELECT</literal> list (Andres Freund)
     </para>

     <para>
      Set-returning functions are now evaluated before evaluation of scalar
      expressions in the <literal>SELECT</literal> list, much as though they had
      been placed in a <literal>LATERAL FROM</literal>-clause item.  This allows
      saner semantics for cases where multiple set-returning functions are
      present.  If they return different numbers of rows, the shorter results
      are extended to match the longest result by adding nulls.  Previously
      the results were cycled until they all terminated at the same time,
      producing a number of rows equal to the least common multiple of the
      functions' periods.  In addition, set-returning functions are now
      disallowed within <literal>CASE</literal> and <literal>COALESCE</literal> constructs.
      For more information
      see <xref linkend="xfunc-sql-functions-returning-set">.
     </para>
    </listitem>

    <listitem>
<!--
2016-11-22 [906bfcad7] Improve handling of "UPDATE ... SET (column_list) = row_
-->
     <para>
      Use standard row constructor syntax in <literal>UPDATE ... SET
      (<replaceable>column_list</replaceable>) = <replaceable>row_constructor</replaceable></literal>
      (Tom Lane)
     </para>

     <para>
      The <replaceable>row_constructor</replaceable> can now begin with the
      keyword <literal>ROW</literal>; previously that had to be omitted.
      If just one column name appears in
      the <replaceable>column_list</replaceable>, then
      the <replaceable>row_constructor</replaceable> now must use
      the <literal>ROW</literal> keyword, since otherwise it is not a valid
      row constructor but just a parenthesized expression.
      Also, an occurrence
      of <literal><replaceable>table_name</replaceable>.*</literal> within
      the <replaceable>row_constructor</replaceable> is now expanded into
      multiple columns, as occurs in other uses
      of <replaceable>row_constructor</replaceable>s.
     </para>
    </listitem>

    <listitem>
<!--
2017-08-04 [c30f1770a] Apply ALTER ... SET NOT NULL recursively in ALTER ... AD
-->
     <para>
      When <command>ALTER TABLE ... ADD PRIMARY KEY</command> marks
      columns <literal>NOT NULL</literal>, that change now propagates to
      inheritance child tables as well (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
2017-09-16 [54d4d0ff6] Fix SQL-spec incompatibilities in new transition table f
2017-09-17 [5cc234931] Ensure that BEFORE STATEMENT triggers fire the right num
-->
     <para>
      Prevent statement-level triggers from firing more than once per
      statement (Tom Lane)
     </para>

     <para>
      Cases involving writable CTEs updating the same table updated by the
      containing statement, or by another writable CTE, fired <literal>BEFORE
      STATEMENT</literal> or <literal>AFTER STATEMENT</literal> triggers more than once.
      Also, if there were statement-level triggers on a table affected by a
      foreign key enforcement action (such as <literal>ON DELETE CASCADE</literal>),
      they could fire more than once per outer SQL statement.  This is
      contrary to the SQL standard, so change it.
     </para>
    </listitem>

    <listitem>
<!--
2016-12-20 [1753b1b02] Add pg_sequence system catalog
2016-11-18 [67dc4ccbb] Add pg_sequences view
2017-05-15 [f8dc1985f] Fix ALTER SEQUENCE locking
2017-06-01 [3d79013b9] Make ALTER SEQUENCE, including RESTART, fully transactio
2017-09-29 [5cc5987ce] psql: Update \d sequence display
-->
     <para>
      Move sequences' metadata fields into a new <link
      linkend="catalog-pg-sequence"><structname>pg_sequence</structname></link>
      system catalog (Peter Eisentraut)
     </para>

     <para>
      A sequence relation now stores only the fields that can be modified
      by <function>nextval()</function>, that
      is <structfield>last_value</structfield>, <structfield>log_cnt</structfield>,
      and <structfield>is_called</structfield>.  Other sequence properties, such as
      the starting value and increment, are kept in a corresponding row of
      the <structname>pg_sequence</structname> catalog.
      <command>ALTER SEQUENCE</command> updates are now fully transactional,
      implying that the sequence is locked until commit.
      The <function>nextval()</function> and <function>setval()</function> functions
      remain nontransactional.
     </para>

     <para>
      The main incompatibility introduced by this change is that selecting
      from a sequence relation now returns only the three fields named
      above.  To obtain the sequence's other properties, applications must
      look into <structname>pg_sequence</structname>.  The new system
      view <link linkend="view-pg-sequences"><structname>pg_sequences</structname></link>
      can also be used for this purpose; it provides column names that are
      more compatible with existing code.
     </para>

     <para>
      The output of <application>psql</application>'s <command>\d</command> command for a
      sequence has been redesigned, too.
     </para>
    </listitem>

    <listitem>
<!--
2017-01-04 [9a4d51077] Make wal streaming the default mode for pg_basebackup
-->
     <para>
      Make <application><xref linkend="app-pgbasebackup"></application> stream the
      <acronym>WAL</acronym> needed to restore the backup by default (Magnus
      Hagander)
     </para>

     <para>
      This changes <application>pg_basebackup</application>'s
      <option>-X</option>/<option>--wal-method</option> default to <literal>stream</literal>.
      An option value <literal>none</literal> has been added to reproduce the old
      behavior.  The <application>pg_basebackup</application> option <option>-x</option>
      has been removed (instead, use <literal>-X fetch</literal>).
     </para>
    </listitem>

    <listitem>
<!--
2017-02-13 [8df9bd0b4] Change logical replication pg_hba.conf use
-->
     <para>
      Change how logical replication
      uses <link linkend="auth-pg-hba-conf"><filename>pg_hba.conf</filename></link>
      (Peter Eisentraut)
     </para>

     <para>
      In previous releases, a logical replication connection required
      the <literal>replication</literal> keyword in the database column.  As
      of this release, logical replication matches a normal entry with a
      database name or keywords such as <literal>all</literal>.  Physical
      replication continues to use the <literal>replication</literal> keyword.
      Since built-in logical replication is new in this release, this
      change only affects users of third-party logical replication plugins.
     </para>
    </listitem>

    <listitem>
<!--
2017-01-14 [05cd12ed5] pg_ctl: Change default to wait for all actions
-->
    <para>
     Make all <application><xref linkend="app-pg-ctl"></application> actions wait
     for completion by default (Peter Eisentraut)
    </para>

    <para>
     Previously some <application>pg_ctl</application> actions didn't wait for
     completion, and required the use of <option>-w</option> to do so.
    </para>
    </listitem>

    <listitem>
<!--
2017-03-27 [3371e4d9b] Change default of log_directory to 'log'
-->
     <para>
      Change the default value of the <xref linkend="guc-log-directory">
      server parameter from <filename>pg_log</filename> to <filename>log</filename>
      (Andreas Karlsson)
     </para>
    </listitem>

    <listitem>
<!--
2017-07-31 [c0a15e07c] Always use 2048 bit DH parameters for OpenSSL ephemeral
-->
     <para>
      Add configuration option <xref linkend="guc-ssl-dh-params-file"> to
      specify file name for custom OpenSSL DH parameters (Heikki Linnakangas)
     </para>

     <para>
      This replaces the hardcoded, undocumented file
      name <filename>dh1024.pem</filename>.  Note that <filename>dh1024.pem</filename> is
      no longer examined by default; you must set this option if you want
      to use custom DH parameters.
     </para>
    </listitem>

    <listitem>
<!--
2017-07-31 [c0a15e07c] Always use 2048 bit DH parameters for OpenSSL ephemeral
-->
     <para>
      Increase the size of the default DH parameters used for OpenSSL
      ephemeral DH ciphers to 2048 bits (Heikki Linnakangas)
     </para>

     <para>
      The size of the compiled-in DH parameters has been increased from
      1024 to 2048 bits, making DH key exchange more resistant to
      brute-force attacks.  However, some old SSL implementations, notably
      some revisions of Java Runtime Environment version 6, will not accept
      DH parameters longer than 1024 bits, and hence will not be able to
      connect over SSL.  If it's necessary to support such old clients, you
      can use custom 1024-bit DH parameters instead of the compiled-in
      defaults.  See <xref linkend="guc-ssl-dh-params-file">.
     </para>
    </listitem>

    <listitem>
<!--
2017-05-08 [eb61136dc] Remove support for password_encryption='off' / 'plain'.
-->
    <para>
     Remove the ability to store unencrypted passwords on the server
     (Heikki Linnakangas)
    </para>

    <para>
     The <xref linkend="guc-password-encryption"> server parameter
     no longer supports <literal>off</literal> or <literal>plain</literal>.
     The <literal>UNENCRYPTED</literal> option is no longer supported in
     <command>CREATE/ALTER USER ... PASSWORD</command>.  Similarly, the
     <option>--unencrypted</option> option has been removed
     from <application>createuser</application>.  Unencrypted passwords migrated from
     older versions will be stored encrypted in this release.  The default
     setting for <varname>password_encryption</varname> is still
     <literal>md5</literal>.
    </para>
    </listitem>

    <listitem>
<!--
2017-02-15 [51ee6f316] Replace min_parallel_relation_size with two new GUCs.
-->
    <para>
     Add <xref linkend="guc-min-parallel-table-scan-size">
     and <xref linkend="guc-min-parallel-index-scan-size"> server
     parameters to control parallel queries (Amit Kapila, Robert Haas)
    </para>

    <para>
     These replace <varname>min_parallel_relation_size</varname>, which was
     found to be too generic.
    </para>
    </listitem>

    <listitem>
<!--
2017-06-20 [a69dfe5f4] Don't downcase entries within shared_preload_libraries e
-->
    <para>
     Don't downcase unquoted text
     within <xref linkend="guc-shared-preload-libraries"> and related
     server parameters (QL Zhuo)
    </para>

    <para>
     These settings are really lists of file names, but they were
     previously treated as lists of SQL identifiers, which have different
     parsing rules.
    </para>
    </listitem>

    <listitem>
<!--
2016-12-23 [e13486eba] Remove sql_inheritance GUC.
-->
    <para>
     Remove <varname>sql_inheritance</varname> server parameter (Robert Haas)
    </para>

    <para>
     Changing this setting from the default value caused queries referencing
     parent tables to not include child tables.  The <acronym>SQL</acronym>
     standard requires them to be included, however, and this has been the
     default since <productname>PostgreSQL</productname> 7.1.
    </para>
    </listitem>

    <listitem>
<!--
2016-10-26 [94aceed31] Support multi-dimensional arrays in PL/python.
2016-10-26 [cfd9c87a5] Only treat Python Lists as array dimensions.
-->
    <para>
     Allow multi-dimensional arrays to be passed into PL/Python functions,
     and returned as nested Python lists (Alexey Grishchenko, Dave Cramer,
     Heikki Linnakangas)
    </para>

    <para>
     This feature requires a backwards-incompatible change to the handling
     of arrays of composite types in PL/Python.  Previously, you could
     return an array of composite values by writing, e.g., <literal>[[col1,
     col2], [col1, col2]]</literal>; but now that is interpreted as a
     two-dimensional array.  Composite types in arrays must now be written
     as Python tuples, not lists, to resolve the ambiguity; that is,
     write <literal>[(col1, col2), (col1, col2)]</literal> instead.
    </para>
    </listitem>

    <listitem>
<!--
2017-02-27 [817f2a586] Remove PL/Tcl's "module" facility.
-->
    <para>
     Remove PL/Tcl's <quote>module</quote> auto-loading facility (Tom Lane)
    </para>

    <para>
     This functionality has been replaced by new server
     parameters <xref linkend="guc-pltcl-start-proc">
     and <xref linkend="guc-pltclu-start-proc">, which are easier to use
     and more similar to features available in other PLs.
    </para>
    </listitem>

    <listitem>
<!--
2016-10-12 [64f3524e2] Remove pg_dump/pg_dumpall support for dumping from pre-8
-->
    <para>
     Remove <application>pg_dump</application>/<application>pg_dumpall</application> support
     for dumping from pre-8.0 servers (Tom Lane)
    </para>

     <para>
      Users needing to dump from pre-8.0 servers will need to use dump
      programs from <productname>PostgreSQL</productname> 9.6 or earlier.  The
      resulting output should still load successfully into newer servers.
     </para>
    </listitem>

    <listitem>
<!--
2017-02-23 [b6aa17e0a] De-support floating-point timestamps.
-->
     <para>
      Remove support for floating-point timestamps and intervals (Tom Lane)
     </para>

     <para>
      This removes configure's <option>--disable-integer-datetimes</option>
      option.  Floating-point timestamps have few advantages and have not
      been the default since <productname>PostgreSQL</productname> 8.3.
     </para>
    </listitem>

    <listitem>
<!--
2016-10-11 [2f1eaf87e] Drop server support for FE/BE protocol version 1.0.
-->
     <para>
      Remove server support for client/server protocol version 1.0 (Tom Lane)
     </para>

     <para>
      This protocol hasn't had client support
      since <productname>PostgreSQL</productname> 6.3.
     </para>
    </listitem>

    <listitem>
<!--
2017-02-13 [7ada2d31f] Remove contrib/tsearch2.
-->
     <para>
      Remove <filename>contrib/tsearch2</filename> module (Robert Haas)
     </para>

     <para>
      This module provided compatibility with the version of full text
      search that shipped in pre-8.3 <productname>PostgreSQL</productname> releases.
     </para>
    </listitem>

    <listitem>
<!--
2017-03-23 [50c956add] Remove createlang and droplang
-->
     <para>
      Remove <application>createlang</application> and <application>droplang</application>
      command-line applications (Peter Eisentraut)
     </para>

     <para>
      These had been deprecated since <productname>PostgreSQL</productname> 9.1.
      Instead, use <command>CREATE EXTENSION</command> and <command>DROP
      EXTENSION</command> directly.
     </para>
    </listitem>

    <listitem>
<!--
2017-03-30 [5ded4bd21] Remove support for version-0 calling conventions.
-->
     <para>
      Remove support for version-0 function calling conventions (Andres
      Freund)
     </para>

     <para>
      Extensions providing C-coded functions must now conform to version 1
      calling conventions.  Version 0 has been deprecated since 2001.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>

  <sect2>
   <title>Changes</title>

   <para>
    Below you will find a detailed account of the changes between
    <productname>PostgreSQL</productname> 10 and the previous major
    release.
   </para>

   <sect3>
    <title>Server</title>

    <sect4>
     <title>Parallel Queries</title>

     <itemizedlist>

      <listitem>
<!--
2017-02-15 [569174f1b] btree: Support parallel index scans.
2017-02-15 [5262f7a4f] Add optimizer and executor support for parallel index sc
2017-02-19 [0414b26ba] Add optimizer and executor support for parallel index-on
-->
       <para>
        Support parallel B-tree index scans (Rahila Syed, Amit Kapila,
        Robert Haas, Rafia Sabih)
       </para>

       <para>
        This change allows B-tree index pages to be searched by separate
        parallel workers.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-08 [98e6e8904] tidbitmap: Support shared iteration.
2017-03-08 [f35742ccb] Support parallel bitmap heap scans.
-->
       <para>
        Support parallel bitmap heap scans (Dilip Kumar)
       </para>

       <para>
        This allows a single index scan to dispatch parallel workers to
        process different areas of the heap.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-07 [3bc7dafa9] Consider parallel merge joins.
-->
       <para>
        Allow merge joins to be performed in parallel (Dilip Kumar)
       </para>
      </listitem>

      <listitem>
<!--
2017-02-14 [5e6d8d2bb] Allow parallel workers to execute subplans.
-->
       <para>
        Allow non-correlated subqueries to be run in parallel (Amit Kapila)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-09 [355d3993c] Add a Gather Merge executor node.
-->
       <para>
        Improve ability of parallel workers to return pre-sorted data
        (Rushabh Lathia)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-24 [61c2e1a95] Improve access to parallel query from procedural languag
-->
       <para>
        Increase parallel query usage in procedural language functions
        (Robert Haas, Rafia Sabih)
       </para>
      </listitem>

      <listitem>
<!--
2016-12-02 [b460f5d66] Add max_parallel_workers GUC.
2016-12-05 [2b959d495] Reduce the default for max_worker_processes back to 8.
-->
       <para>
        Add <xref linkend="guc-max-parallel-workers"> server parameter
        to limit the number of worker processes that can be used for
        query parallelism (Julien Rouhaud)
       </para>

       <para>
        This parameter can be set lower than <xref
        linkend="guc-max-worker-processes"> to reserve worker processes
        for purposes other than parallel queries.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Indexes</title>

     <itemizedlist>

      <listitem>
<!--
2017-02-27 [30df93f69] hash: Refactor overflow page allocation.
2017-03-14 [c11453ce0] hash: Add write-ahead logging support.
2017-02-27 [b0f18cb77] hash: Refactor bucket squeeze code.
-->
       <para>
        Add write-ahead logging support to hash indexes (Amit Kapila)
       </para>

       <para>
        This makes hash indexes crash-safe and replicatable.
        The former warning message about their use is removed.
       </para>
      </listitem>

      <listitem>
<!--
2016-11-30 [6d46f4783] Improve hash index bucket split behavior.
2017-02-07 [293e24e50] Cache hash index's metapage in rel->rd_amcache.
2017-03-15 [6977b8b7f] Port single-page btree vacuum logic to hash indexes.
2017-04-03 [ea69a0dea] Expand hash indexes more gradually.
2017-08-04 [620b49a16] hash: Increase the number of possible overflow bitmaps b
-->
       <para>
        Improve hash index performance (Amit Kapila, Mithun Cy, Ashutosh
        Sharma)
       </para>
      </listitem>

      <listitem>
<!--
2016-08-23 [77e290682] Create an SP-GiST opclass for inet/cidr.
-->
       <para>
        Add <acronym>SP-GiST</acronym> index support for <type>INET</type> and
        <type>CIDR</type> data types (Emre Hasegeli)
       </para>
      </listitem>

      <listitem>
<!--
2017-04-01 [7526e1022] BRIN auto-summarization
-->
       <para>
        Add option to allow <acronym>BRIN</acronym> index summarization to happen
        more aggressively (&Aacute;lvaro Herrera)
       </para>

       <para>
        A new <link linkend="sql-createindex"><command>CREATE
        INDEX</command></link> option enables auto-summarization of the
        previous <acronym>BRIN</acronym> page range when a new page
        range is created.
       </para>
      </listitem>

      <listitem>
<!--
2017-04-01 [c655899ba] BRIN de-summarization
-->
       <para>
        Add functions to remove and re-add <acronym>BRIN</acronym>
        summarization for <acronym>BRIN</acronym> index ranges (&Aacute;lvaro
        Herrera)
       </para>

       <para>
        The new <acronym>SQL</acronym> function <link
        linkend="functions-admin-index-table"><function>brin_summarize_range()</function></link>
        updates <acronym>BRIN</acronym> index summarization for a specified
        range and <function>brin_desummarize_range()</function> removes it.
        This is helpful to update summarization of a range that is now
        smaller due to <command>UPDATE</command>s and <command>DELETE</command>s.
       </para>
      </listitem>

      <listitem>
<!--
2017-04-06 [7e534adcd] Fix BRIN cost estimation
-->
       <para>
        Improve accuracy in determining if a <acronym>BRIN</acronym> index scan
        is beneficial (David Rowley, Emre Hasegeli)
       </para>
      </listitem>

      <listitem>
<!--
2016-09-09 [b1328d78f] Invent PageIndexTupleOverwrite, and teach BRIN and GiST
-->
       <para>
        Allow faster <acronym>GiST</acronym> inserts and updates by reusing
        index space more efficiently (Andrey Borodin)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-23 [218f51584] Reduce page locking in GIN vacuum
-->
       <para>
        Reduce page locking during vacuuming of <acronym>GIN</acronym> indexes
        (Andrey Borodin)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>

     <title>Locking</title>

     <itemizedlist>

      <listitem>
<!--
2017-03-06 [21d4e2e20] Reduce lock levels for table storage params related to p
2017-04-05 [68ea2b7f9] Reduce lock level for CREATE STATISTICS
-->
       <para>
        Reduce locking required to change table parameters (Simon Riggs,
        Fabr&iacute;zio Mello)
       </para>

       <para>
        For example, changing a table's <xref
        linkend="guc-effective-io-concurrency"> setting can now be done
        with a more lightweight lock.
       </para>
      </listitem>

      <listitem>
<!--
2017-04-07 [c63172d60] Add GUCs for predicate lock promotion thresholds.
-->
       <para>
        Allow tuning of predicate lock promotion thresholds (Dagfinn
        Ilmari Manns&aring;ker)
       </para>

       <para>
        Lock promotion can now be controlled through two new server
        parameters, <xref
        linkend="guc-max-pred-locks-per-relation"> and
        <xref linkend="guc-max-pred-locks-per-page">.
       </para>
      </listitem>

    </itemizedlist>

    </sect4>

    <sect4>
     <title>Optimizer</title>

     <itemizedlist>

      <listitem>
<!--
2017-03-24 [7b504eb28] Implement multivariate n-distinct coefficients
2017-04-05 [2686ee1b7] Collect and use multi-column dependency stats
2017-05-12 [bc085205c] Change CREATE STATISTICS syntax
-->
      <para>
       Add multi-column optimizer statistics to compute the correlation
       ratio and number of distinct values (Tomas Vondra, David Rowley,
       &Aacute;lvaro Herrera)
      </para>

      <para>
       New commands are <link
       linkend="sql-createstatistics"><command>CREATE STATISTICS</command></link>,
       <link linkend="sql-alterstatistics"><command>ALTER STATISTICS</command></link>, and
       <link linkend="sql-dropstatistics"><command>DROP STATISTICS</command></link>.
       This feature is helpful in estimating query memory usage and when
       combining the statistics from individual columns.
      </para>
      </listitem>

      <listitem>
<!--
2017-01-18 [215b43cdc] Improve RLS planning by marking individual quals with se
-->
      <para>
       Improve performance of queries affected by row-level security
       restrictions (Tom Lane)
      </para>

      <para>
       The optimizer now has more knowledge about where it can place RLS
       filter conditions, allowing better plans to be generated while still
       enforcing the RLS conditions safely.
      </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>General Performance</title>

     <itemizedlist>

      <listitem>
<!--
2016-09-02 [9cca11c91] Speed up SUM calculation in numeric aggregates.
-->
       <para>
        Speed up aggregate functions that calculate a running sum
        using <type>numeric</type>-type arithmetic, including some variants
        of <function>SUM()</function>, <function>AVG()</function>,
        and <function>STDDEV()</function> (Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-13 [aeed17d00] Use radix tree for character encoding conversions.
-->
       <para>
        Improve performance of character encoding conversions by
        using radix trees (Kyotaro Horiguchi, Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-25 [b8d7f053c] Faster expression evaluation and targetlist projection.
2017-07-30 [cc9f08b6b] Move ExecProcNode from dispatch to function pointer base
-->
       <para>
        Reduce expression evaluation overhead during query execution,
        as well as plan node calling overhead (Andres Freund)
       </para>

       <para>
        This is particularly helpful for queries that process many rows.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-27 [b5635948a] Support hashed aggregation with grouping sets.
-->
       <para>
        Allow hashed aggregation to be used with grouping sets (Andrew
        Gierth)
       </para>
      </listitem>

      <listitem>
<!--
2017-04-07 [9c7f5229a] Optimize joins when the inner relation can be proven uni
2017-06-03 [23886581b] Fix old corner-case logic error in final_cost_nestloop()
-->
       <para>
        Use uniqueness guarantees to optimize certain join types (David
        Rowley)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-29 [f90d23d0c] Implement SortSupport for macaddr data type
-->
       <para>
        Improve sort performance of the <type>macaddr</type> data type (Brandur Leach)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-27 [090010f2e] Improve performance of find_tabstat_entry()/get_tabstat_
-->
       <para>
        Reduce statistics tracking overhead in sessions that reference
        many thousands of relations (Aleksander Alekseev)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Monitoring</title>

     <itemizedlist>

      <listitem>
<!--
2017-03-08 [f9b1a0dd4] Expose explain's SUMMARY option
-->
       <para>
        Allow explicit control
        over <link linkend="sql-explain"><command>EXPLAIN</command></link>'s display
        of planning and execution time (Ashutosh Bapat)
       </para>

       <para>
        By default planning and execution time are displayed by
        <command>EXPLAIN ANALYZE</command> and are not displayed in other cases.
        The new <command>EXPLAIN</command> option <literal>SUMMARY</literal> allows
        explicit control of this.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-30 [25fff4079] Default monitoring roles
-->
       <para>
        Add default monitoring roles (Dave Page)
       </para>

       <para>
        New roles <literal>pg_monitor</literal>, <literal>pg_read_all_settings</literal>,
        <literal>pg_read_all_stats</literal>, and <literal>pg_stat_scan_tables</literal>
        allow simplified permission configuration.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-18 [17f8ffa1e] Fix REFRESH MATERIALIZED VIEW to report activity to the
-->
       <para>
        Properly update the statistics collector during <link
        linkend="sql-refreshmaterializedview"><command>REFRESH MATERIALIZED
        VIEW</command></link> (Jim Mlodgenski)
       </para>
      </listitem>

     </itemizedlist>

     <sect5>
      <title>Logging</title>

      <itemizedlist>

       <listitem>
<!--
2016-10-17 [7d3235ba4] By default, set log_line_prefix = '%m [%p] '.
-->
        <para>
         Change the default value of <xref linkend="guc-log-line-prefix">
         to include current timestamp (with milliseconds) and the process ID
         in each line of postmaster log output (Christoph Berg)
        </para>

        <para>
         The previous default was an empty prefix.
        </para>
       </listitem>

       <listitem>
<!--
2017-03-16 [befd73c50] Add pg_ls_logdir() and pg_ls_waldir() functions.
-->
        <para>
         Add functions to return the log and <acronym>WAL</acronym> directory
         contents (Dave Page)
        </para>

        <para>
         The new functions
         are <link linkend="functions-admin-genfile-table"><function>pg_ls_logdir()</function></link>
         and <link linkend="functions-admin-genfile-table"><function>pg_ls_waldir()</function></link>
         and can be executed by non-superusers with the proper
         permissions.
        </para>
       </listitem>

       <listitem>
<!--
2017-03-03 [19dc233c3] Add pg_current_logfile() function.
-->
        <para>
         Add function <link
         linkend="functions-info-session-table"><function>pg_current_logfile()</function></link>
         to read logging collector's current stderr and csvlog output file names
         (Gilles Darold)
        </para>
       </listitem>

       <listitem>
<!--
2017-03-10 [f9dfa5c97] Improve postmaster's logging of listen socket creation.
2017-03-14 [2b32ac2a5] Include port number when logging successful binding to a
-->
        <para>
         Report the address and port number of each listening socket
         in the server log during postmaster startup (Tom Lane)
        </para>

        <para>
         Also, when logging failure to bind a listening socket, include
         the specific address we attempted to bind to.
        </para>
       </listitem>

       <listitem>
<!--
2017-03-10 [6ec4c8584] Reduce log verbosity of startup/shutdown for launcher su
-->
        <para>
         Reduce log chatter about the starting and stopping of launcher
         subprocesses (Tom Lane)
        </para>

        <para>
         These are now <literal>DEBUG1</literal>-level messages.
        </para>
       </listitem>

       <listitem>
<!--
2016-11-17 [a43f1939d] Remove or reduce verbosity of some debug messages.
-->
        <para>
         Reduce message verbosity of lower-numbered debug levels
         controlled by
         <xref linkend="guc-log-min-messages"> (Robert Haas)
        </para>

        <para>
         This also changes the verbosity of <xref
         linkend="guc-client-min-messages"> debug levels.
        </para>
       </listitem>

      </itemizedlist>

     </sect5>

     <sect5>
      <title><link linkend="pg-stat-activity-view"><structname>pg_stat_activity</structname></link></title>

      <itemizedlist>

       <listitem>
<!--
2016-10-04 [6f3bd98eb] Extend framework from commit 53be0b1ad to report latch w
2017-03-18 [249cf070e] Create and use wait events for read, write, and fsync op
-->
        <para>
         Add <structname>pg_stat_activity</structname> reporting of low-level wait
         states (Michael Paquier, Robert Haas, Rushabh Lathia)
        </para>

        <para>
         This change enables reporting of numerous low-level wait conditions,
         including latch waits, file reads/writes/fsyncs, client reads/writes,
         and synchronous replication.
        </para>
       </listitem>

       <listitem>
<!--
2016-09-12 [fc3d4a44e] Identify walsenders in pg_stat_activity
2017-03-26 [fc70a4b0d] Show more processes in pg_stat_activity.
-->
        <para>
         Show auxiliary processes, background workers, and walsender
         processes in <structname>pg_stat_activity</structname> (Kuntal Ghosh,
         Michael Paquier)
        </para>

        <para>
         This simplifies monitoring.  A new
         column <structfield>backend_type</structfield> identifies the process type.
        </para>
       </listitem>

       <listitem>
<!--
2017-02-22 [4c728f382] Pass the source text for a parallel query to the workers
-->
        <para>
         Allow <structname>pg_stat_activity</structname> to show the SQL query
         being executed by parallel workers (Rafia Sabih)
        </para>
       </listitem>

       <listitem>
<!--
2016-12-16 [3761fe3c2] Simplify LWLock tranche machinery by removing array_base
-->
        <para>
         Rename
         <structname>pg_stat_activity</structname>.<structfield>wait_event_type</structfield>
         values <literal>LWLockTranche</literal> and
         <literal>LWLockNamed</literal> to <literal>LWLock</literal> (Robert Haas)
        </para>

        <para>
         This makes the output more consistent.
        </para>
       </listitem>

      </itemizedlist>

     </sect5>
    </sect4>

    <sect4>
     <title><acronym>Authentication</acronym></title>

     <itemizedlist>

      <listitem>
<!--
2017-03-07 [818fd4a67] Support SCRAM-SHA-256 authentication (RFC 5802 and 7677)
2017-03-24 [7ac955b34] Allow SCRAM authentication, when pg_hba.conf says 'md5'.
2017-04-07 [60f11b87a] Use SASLprep to normalize passwords for SCRAM authentica
2017-04-18 [c727f120f] Rename "scram" to "scram-sha-256" in pg_hba.conf and pas
-->
       <para>
        Add <link linkend="auth-password">SCRAM-SHA-256</link>
        support for password negotiation and storage (Michael Paquier,
        Heikki Linnakangas)
      </para>

       <para>
        This provides better security than the existing <literal>md5</literal>
        negotiation and storage method.
       </para>
      </listitem>

      <listitem>
<!--
2016-09-28 [babe05bc2] Turn password_encryption GUC into an enum.
-->
       <para>
        Change the <xref linkend="guc-password-encryption"> server parameter
        from <type>boolean</type> to <type>enum</type> (Michael Paquier)
       </para>

       <para>
        This was necessary to support additional password hashing options.
       </para>
      </listitem>

      <listitem>
<!--
2017-01-30 [de16ab723] Invent pg_hba_file_rules view to show the content of pg_
-->
       <para>
        Add view <link
        linkend="view-pg-hba-file-rules"><structname>pg_hba_file_rules</structname></link>
        to display the contents of <filename>pg_hba.conf</filename> (Haribabu
        Kommi)
       </para>

       <para>
        This shows the file contents, not the currently active settings.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-22 [6b76f1bb5] Support multiple RADIUS servers
-->
       <para>
        Support multiple <acronym>RADIUS</acronym> servers (Magnus Hagander)
       </para>

       <para>
        All the <acronym>RADIUS</acronym> related parameters are now plural and
        support a comma-separated list of servers.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Server Configuration</title>

     <itemizedlist>

      <listitem>
<!--
2017-01-02 [de41869b6] Allow SSL configuration to be updated at SIGHUP.
2017-01-03 [1e942c747] Disable prompting for passphrase while (re)loading SSL c
2017-01-04 [6667d9a6d] Re-allow SSL passphrase prompt at server start, but not
-->
       <para>
        Allow <acronym>SSL</acronym> configuration to be updated during
        configuration reload (Andreas Karlsson, Tom Lane)
       </para>

       <para>
        This allows <acronym>SSL</acronym> to be reconfigured without a server
        restart, by using <command>pg_ctl reload</command>, <command>SELECT
        pg_reload_conf()</command>, or sending a <literal>SIGHUP</literal> signal.
        However, reloading the <acronym>SSL</acronym> configuration does not work
        if the server's <acronym>SSL</acronym> key requires a passphrase, as there
        is no way to re-prompt for the passphrase.  The original
        configuration will apply for the life of the postmaster in that
        case.
       </para>
      </listitem>

      <listitem>
<!--
2017-02-02 [14ca9abfb] Increase upper bound for bgwriter_lru_maxpages.
-->
       <para>
        Make the maximum value of <xref
        linkend="guc-bgwriter-lru-maxpages"> effectively unlimited
        (Jim Nasby)
       </para>
      </listitem>

    </itemizedlist>

    </sect4>

    <sect4>
     <title>Reliability</title>

     <itemizedlist>

      <listitem>
<!--
2017-03-27 [1b02be21f] Fsync directory after creating or unlinking file.
-->
       <para>
        After creating or unlinking files, perform an fsync on their parent
        directory (Michael Paquier)
       </para>

       <para>
        This reduces the risk of data loss after a power failure.
       </para>
      </listitem>

     </itemizedlist>

     <sect5>
      <title><link linkend="wal">Write-Ahead Log</link> (<acronym>WAL</acronym>)</title>

      <itemizedlist>

       <listitem>
<!--
2016-12-22 [6ef2eba3f] Skip checkpoints, archiving on idle systems.
-->
        <para>
         Prevent unnecessary checkpoints and <acronym>WAL</acronym> archiving on
         otherwise-idle systems (Michael Paquier)
        </para>
       </listitem>

       <listitem>
<!--
2017-02-08 [a507b8690] Add WAL consistency checking facility.
2017-03-14 [bb4a39637] hash: Support WAL consistency checking.
-->
        <para>
         Add <xref linkend="guc-wal-consistency-checking"> server parameter
         to add details to <acronym>WAL</acronym> that can be sanity-checked on
         the standby (Kuntal Ghosh, Robert Haas)
        </para>

        <para>
         Any sanity-check failure generates a fatal error on the standby.
        </para>
       </listitem>

       <listitem>
<!--
2017-04-05 [00b6b6feb] Allow -\-with-wal-segsize=n up to n=1024MB
-->
        <para>
         Increase the maximum configurable <acronym>WAL</acronym> segment size
         to one gigabyte (Beena Emerson)
        </para>

        <para>
         A larger <acronym>WAL</acronym> segment size allows for fewer
         <xref linkend="guc-archive-command"> invocations and fewer
         <acronym>WAL</acronym> files to manage.
        </para>
       </listitem>

      </itemizedlist>

     </sect5>

    </sect4>

   </sect3>

   <sect3>
    <title>Replication and Recovery</title>

    <itemizedlist>

     <listitem>
<!--
2017-01-20 [665d1fad9] Logical replication
2017-03-23 [7c4f52409] Logical replication support for initial data copy
2017-04-12 [ff7bce174] Add max_sync_workers_per_subscription to postgresql.conf
-->
      <para>
       Add the ability to <link linkend="logical-replication">logically
       replicate</link> tables to standby servers (Petr Jelinek)
      </para>

      <para>
       Logical replication allows more flexibility than physical
       replication does, including replication between different major
       versions of <productname>PostgreSQL</productname> and selective
       replication.
      </para>
     </listitem>

     <listitem>
<!--
2016-12-19 [3901fd70c] Support quorum-based synchronous replication.
-->
      <para>
       Allow waiting for commit acknowledgement from standby
       servers irrespective of the order they appear in <xref
       linkend="guc-synchronous-standby-names"> (Masahiko Sawada)
      </para>

      <para>
       Previously the server always waited for the active standbys that
       appeared first in <varname>synchronous_standby_names</varname>.  The new
       <varname>synchronous_standby_names</varname> keyword <literal>ANY</literal> allows
       waiting for any number of standbys irrespective of their ordering.
       This is known as quorum commit.
      </para>
     </listitem>

     <listitem>
<!--
2017-01-14 [f6d6d2920] Change default values for backup and replication paramet
2017-05-02 [34fc61673] Change hot_standby default value to 'on'
-->
      <para>
       Reduce configuration changes necessary to perform streaming backup
       and replication (Magnus Hagander, Dang Minh Huong)
      </para>

      <para>
       Specifically, the defaults were changed for <xref
       linkend="guc-wal-level">, <xref linkend="guc-max-wal-senders">,
       <xref linkend="guc-max-replication-slots">, and <xref
       linkend="guc-hot-standby"> to make them suitable for these usages
       out-of-the-box.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-09 [be37c2120] Enable replication connections by default in pg_hba.conf
-->
      <para>
       Enable replication from localhost connections by default in
       <link linkend="auth-pg-hba-conf"><filename>pg_hba.conf</filename></link>
       (Michael Paquier)
      </para>

      <para>
       Previously <filename>pg_hba.conf</filename>'s replication connection
       lines were commented out by default.  This is particularly useful for
       <application><xref linkend="app-pgbasebackup"></application>.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-23 [6912acc04] Replication lag tracking for walsenders
-->
      <para>
       Add columns to <link
       linkend="monitoring-stats-views-table"><structname>pg_stat_replication</structname></link>
       to report replication delay times (Thomas Munro)
      </para>

      <para>
       The new columns are <structfield>write_lag</structfield>,
       <structfield>flush_lag</structfield>, and <structfield>replay_lag</structfield>.
      </para>
     </listitem>

     <listitem>
<!--
2016-09-03 [35250b6ad] New recovery target recovery_target_lsn
-->
      <para>
       Allow specification of the recovery stopping point by Log Sequence
       Number (<acronym>LSN</acronym>) in
       <link linkend="recovery-config"><filename>recovery.conf</filename></link>
       (Michael Paquier)
      </para>

      <para>
       Previously the stopping point could only be selected by timestamp or
       XID.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-22 [017e4f258] Expose waitforarchive option through pg_stop_backup()
2017-08-05 [52f8a59dd] Make pg_stop_backup's wait_for_archive flag work on stan
-->
      <para>
       Allow users to disable <link
       linkend="functions-admin"><function>pg_stop_backup()</function></link>'s
       waiting for all <acronym>WAL</acronym> to be archived (David Steele)
      </para>

      <para>
       An optional second argument to <function>pg_stop_backup()</function>
       controls that behavior.
      </para>
     </listitem>

     <listitem>
<!--
2016-12-12 [a924c327e] Add support for temporary replication slots
-->
      <para>
       Allow creation of <link
       linkend="functions-replication-table">temporary replication slots</link>
       (Petr Jelinek)
      </para>

      <para>
       Temporary slots are automatically removed on session exit or error.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-22 [9b013dc23] Improve performance of replay of AccessExclusiveLocks
-->
      <para>
       Improve performance of hot standby replay with better tracking of
       Access Exclusive locks (Simon Riggs, David Rowley)
      </para>
     </listitem>

     <listitem>
<!--
2017-04-04 [728bd991c] Speedup 2PC recovery by skipping two phase state files i
-->
      <para>
       Speed up two-phase commit recovery performance (Stas Kelvich,
       Nikhil Sontakke, Michael Paquier)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Queries</title>

    <itemizedlist>

     <listitem>
<!--
2017-03-08 [fcec6caaf] Support XMLTABLE query expression
-->
      <para>
       Add <link
       linkend="functions-xml-processing-xmltable"><function>XMLTABLE</function></link>
       function that converts <type>XML</type>-formatted data into a row set
       (Pavel Stehule, &Aacute;lvaro Herrera)
      </para>
     </listitem>

     <listitem>
<!--
2016-09-05 [c54159d44] Make locale-dependent regex character classes work for l
-->
      <para>
       Fix regular expressions' character class handling for large character
       codes, particularly Unicode characters above <literal>U+7FF</literal>
       (Tom Lane)
      </para>

      <para>
       Previously, such characters were never recognized as belonging to
       locale-dependent character classes such as <literal>[[:alpha:]]</literal>.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Utility Commands</title>

    <itemizedlist>

     <listitem>
<!--
2016-12-07 [f0e44751d] Implement table partitioning.
-->
      <para>
       Add table <link linkend="sql-createtable-partition">partitioning
       syntax</link> that automatically creates partition constraints and
       handles routing of tuple insertions and updates (Amit Langote)
      </para>

      <para>
       The syntax supports range and list partitioning.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-04 [8c48375e5] Implement syntax for transition tables in AFTER triggers
2017-04-04 [5ebeb579b] Follow-on cleanup for the transition table patch.
2017-03-31 [597027163] Add transition table support to plpgsql.
-->
      <para>
       Add <link linkend="sql-createtrigger"><literal>AFTER</literal> trigger</link>
       transition tables to record changed rows (Kevin Grittner, Thomas
       Munro)
      </para>

      <para>
       Transition tables are accessible from triggers written in
       server-side languages.
      </para>
     </listitem>

     <listitem>
<!--
2016-12-05 [093129c9d] Add support for restrictive RLS policies
-->
      <para>
       Allow <link linkend="sql-createpolicy">restrictive row-level
       security policies</link> (Stephen Frost)
      </para>

      <para>
       Previously all security policies were permissive, meaning that any
       matching policy allowed access.  A restrictive policy must
       match for access to be granted.  These policy types can be combined.
      </para>
     </listitem>

      <listitem>
<!--
2017-03-31 [64d4da511] For foreign keys, check REFERENCES privilege only on the
-->
       <para>
        When creating a foreign-key constraint, check
        for <literal>REFERENCES</literal> permission on only the referenced table
        (Tom Lane)
       </para>

       <para>
        Previously <literal>REFERENCES</literal> permission on the referencing
        table was also required.  This appears to have stemmed from a
        misreading of the SQL standard.  Since creating a foreign key (or
        any other type of) constraint requires ownership privilege on the
        constrained table, additionally requiring <literal>REFERENCES</literal>
        permission seems rather pointless.
       </para>
      </listitem>

     <listitem>
<!--
2017-03-28 [ab89e465c] Altering default privileges on schemas
-->
      <para>
       Allow <link linkend="sql-alterdefaultprivileges">default
       permissions</link> on schemas (Matheus Oliveira)
      </para>

      <para>
       This is done using the <literal>ALTER DEFAULT PRIVILEGES</literal> command.
      </para>
     </listitem>

     <listitem>
<!--
2017-02-10 [2ea5b06c7] Add CREATE SEQUENCE AS <data type> clause
-->
      <para>
       Add <link linkend="sql-createsequence"><command>CREATE SEQUENCE
       AS</command></link> command to create a sequence matching an integer data type
       (Peter Eisentraut)
      </para>

      <para>
       This simplifies the creation of sequences matching the range of
       base columns.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-10 [279c439c7] Support "COPY view FROM" for views with INSTEAD OF INSER
-->
      <para>
       Allow <literal>COPY <replaceable>view</replaceable>
       FROM <replaceable>source</replaceable></literal> on views with <literal>INSTEAD
       INSERT</literal> triggers (Haribabu Kommi)
      </para>

      <para>
       The triggers are fed the data rows read by <command>COPY</command>.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-14 [aefeb6874] Allow referring to functions without arguments when uniq
-->
      <para>
       Allow the specification of a function name without arguments in
       <acronym>DDL</acronym> commands, if it is unique (Peter Eisentraut)
      </para>

      <para>
       For example, allow <link linkend="sql-dropfunction"><command>DROP
       FUNCTION</command></link> on a function name without arguments if there
       is only one function with that name.  This behavior is required by the
       <acronym>SQL</acronym> standard.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-06 [583f6c414] Allow dropping multiple functions at once
-->
      <para>
       Allow multiple functions, operators, and aggregates to be dropped
       with a single <command>DROP</command> command (Peter Eisentraut)
      </para>
     </listitem>

     <listitem>
<!--
2017-02-15 [6d16ecc64] Add CREATE COLLATION IF NOT EXISTS clause
2017-03-20 [b6fb534f1] Add IF NOT EXISTS for CREATE SERVER and CREATE USER MAPP
-->
      <para>
       Support <literal>IF NOT EXISTS</literal>
       in <link linkend="sql-createserver"><command>CREATE SERVER</command></link>,
       <link linkend="sql-createusermapping"><command>CREATE USER MAPPING</command></link>,
       and <link linkend="sql-createcollation"><command>CREATE COLLATION</command></link>
       (Anastasia Lubennikova, Peter Eisentraut)
      </para>
     </listitem>

     <listitem>
<!--
2017-03-25 [70adf2fbe] Make VACUUM VERBOSE report the number of skipped frozen
2017-03-03 [9eb344faf] Allow vacuums to report oldestxmin
-->
      <para>
       Make <link linkend="sql-vacuum"><command>VACUUM VERBOSE</command></link> report
       the number of skipped frozen pages and oldest xmin (Masahiko
       Sawada, Simon Riggs)
      </para>

      <para>
       This information is also included in <xref
       linkend="guc-log-autovacuum-min-duration"> output.
      </para>
     </listitem>

     <listitem>
<!--
2017-01-23 [7e26e02ee] Prefetch blocks during lazy vacuum's truncation scan
-->
      <para>
       Improve speed of <command>VACUUM</command>'s removal of trailing empty
       heap pages (Claudio Freire, &Aacute;lvaro Herrera)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Data Types</title>

    <itemizedlist>

      <listitem>
<!--
2017-03-31 [e306df7f9] Full Text Search support for JSON and JSONB
-->
       <para>
        Add full text search support for <type>JSON</type> and <type>JSONB</type>
        (Dmitry Dolgov)
       </para>

       <para>
        The functions <function>ts_headline()</function> and
        <function>to_tsvector()</function> can now be used on these data types.
       </para>
      </listitem>

     <listitem>
<!--
2017-03-15 [c7a9fa399] Add support for EUI-64 MAC addresses as macaddr8
-->
      <para>
       Add support for <acronym>EUI-64</acronym> <acronym>MAC</acronym> addresses, as a
       new data type <link linkend="datatype-macaddr8"><type>macaddr8</type></link>
       (Haribabu Kommi)
      </para>

      <para>
       This complements the existing support
       for <acronym>EUI-48</acronym> <acronym>MAC</acronym> addresses
       (type <type>macaddr</type>).
      </para>
     </listitem>

     <listitem>
<!--
2017-04-06 [321732705] Identity columns
-->
      <para>
       Add <link linkend="sql-createtable">identity columns</link> for
       assigning a numeric value to columns on insert (Peter Eisentraut)
      </para>

      <para>
       These are similar to <type>SERIAL</type> columns, but are
       <acronym>SQL</acronym> standard compliant.
      </para>
     </listitem>

     <listitem>
<!--
2016-09-07 [0ab9c56d0] Support renaming an existing value of an enum type.
-->
      <para>
       Allow <link linkend="datatype-enum"><type>ENUM</type></link> values to be
       renamed (Dagfinn Ilmari Manns&aring;ker)
      </para>

      <para>
       This uses the syntax <link linkend="sql-altertype"><command>ALTER
       TYPE ... RENAME VALUE</command></link>.
      </para>
     </listitem>

     <listitem>
<!--
2017-02-22 [502a3832c] Correctly handle array pseudotypes in to_json and to_jso
-->
      <para>
       Properly treat array pseudotypes
       (<type>anyarray</type>) as arrays in <link
       linkend="functions-json-creation-table"><function>to_json()</function></link>
       and <function>to_jsonb()</function> (Andrew Dunstan)
      </para>

      <para>
       Previously columns declared as <type>anyarray</type> (particularly those
       in the <structname>pg_stats</structname> view) were converted to <type>JSON</type>
       strings rather than arrays.
      </para>
     </listitem>

     <listitem>
<!--
2017-01-17 [323b96aa3] Register missing money operators in system catalogs
-->
      <para>
       Add operators for multiplication and division
       of <link linkend="datatype-money"><type>money</type></link> values
       with <type>int8</type> values (Peter Eisentraut)
      </para>

      <para>
       Previously such cases would result in converting the <type>int8</type>
       values to <type>float8</type> and then using
       the <type>money</type>-and-<type>float8</type> operators.  The new behavior
       avoids possible precision loss.  But note that division
       of <type>money</type> by <type>int8</type> now truncates the quotient, like
       other integer-division cases, while the previous behavior would have
       rounded.
      </para>
     </listitem>

     <listitem>
<!--
2016-09-14 [656df624c] Add overflow checks to money type input function
-->
      <para>
       Check for overflow in the <type>money</type> type's input function
       (Peter Eisentraut)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Functions</title>

    <itemizedlist>

     <listitem>
<!--
2016-08-17 [cf9b0fea5] Implement regexp_match(), a simplified alternative to re
-->
      <para>
       Add simplified <link
       linkend="functions-posix-regexp"><function>regexp_match()</function></link>
       function (Emre Hasegeli)
      </para>

      <para>
       This is similar to <function>regexp_matches()</function>, but it only
       returns results from the first match so it does not need to return a
       set, making it easier to use for simple cases.
      </para>
     </listitem>

     <listitem>
<!--
2017-01-18 [d00ca333c] Implement array version of jsonb_delete and operator
-->
      <para>
       Add a version of <type>jsonb</type>'s <link
       linkend="functions-jsonb-op-table">delete operator</link> that takes
       an array of keys to delete (Magnus Hagander)
      </para>
     </listitem>

     <listitem>
<!--
2017-04-06 [cf35346e8] Make json_populate_record and friends operate recursivel
-->
      <para>
       Make <link linkend="functions-json-processing-table"><function>json_populate_record()</function></link>
       and related functions process JSON arrays and objects recursively
       (Nikita Glukhov)
      </para>

      <para>
       With this change, array-type fields in the destination SQL type are
       properly converted from JSON arrays, and composite-type fields are
       properly converted from JSON objects.  Previously, such cases would
       fail because the text representation of the JSON value would be fed
       to <function>array_in()</function> or <function>record_in()</function>, and its
       syntax would not match what those input functions expect.
      </para>
     </listitem>

     <listitem>
<!--
2016-08-23 [86f31695f] Add txid_current_ifassigned().
-->
      <para>
       Add function <link
       linkend="functions-txid-snapshot"><function>txid_current_if_assigned()</function></link>
       to return the current transaction ID or <literal>NULL</literal> if no
       transaction ID has been assigned (Craig Ringer)
      </para>

      <para>
       This is different from <link
       linkend="functions-txid-snapshot"><function>txid_current()</function></link>,
       which always returns a transaction ID, assigning one if necessary.
       Unlike that function, this function can be run on standby servers.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-24 [857ee8e39] Add a txid_status function.
-->
      <para>
       Add function <link
       linkend="functions-txid-snapshot"><function>txid_status()</function></link>
       to check if a transaction was committed (Craig Ringer)
      </para>

      <para>
       This is useful for checking after an abrupt disconnection whether
       your previous transaction committed and you just didn't receive
       the acknowledgement.
      </para>
     </listitem>

     <listitem>
<!--
2017-01-19 [30bcebbdc] Allow negative years in make_date to represent BC years
-->
      <para>
       Allow <link
       linkend="functions-datetime-table"><function>make_date()</function></link>
       to interpret negative years as <acronym>BC</acronym> years (&Aacute;lvaro
       Herrera)
      </para>
     </listitem>

     <listitem>
<!--
2016-09-28 [d3cd36a13] Make to_timestamp() and to_date() range-check fields of
-->
      <para>
       Make <link
       linkend="functions-formatting-table"><function>to_timestamp()</function></link>
       and <function>to_date()</function> reject
       out-of-range input fields (Artur Zakirov)
      </para>

      <para>
       For example,
       previously <literal>to_date('2009-06-40','YYYY-MM-DD')</literal> was
       accepted and returned <literal>2009-07-10</literal>.  It will now generate
       an error.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Server-Side Languages</title>

    <itemizedlist>

     <listitem>
<!--
2017-03-27 [70ec3f1f8] PL/Python: Add cursor and execute methods to plan object
-->
      <para>
       Allow PL/Python's <function>cursor()</function> and <function>execute()</function>
       functions to be called as methods of their plan-object arguments
       (Peter Eisentraut)
      </para>

      <para>
       This allows a more object-oriented programming style.
      </para>
     </listitem>

     <listitem>
<!--
2016-12-13 [55caaaeba] Improve handling of array elements as getdiag_targets an
-->
      <para>
       Allow PL/pgSQL's <command>GET DIAGNOSTICS</command> statement to retrieve
       values into array elements (Tom Lane)
      </para>

      <para>
       Previously, a syntactic restriction prevented the target variable
       from being an array element.
      </para>
     </listitem>

    </itemizedlist>

    <sect4>
     <title><link linkend="pltcl">PL/Tcl</link></title>

     <itemizedlist>

      <listitem>
<!--
2016-11-06 [26abb50c4] Support PL/Tcl functions that return composite types and
-->
       <para>
        Allow PL/Tcl functions to return composite types and sets
        (Karl Lehenbauer)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-11 [b58fd4a9c] Add a "subtransaction" command to PL/Tcl.
-->
       <para>
        Add a subtransaction command to PL/Tcl (Victor Wagner)
       </para>

       <para>
        This allows PL/Tcl queries to fail without aborting the entire
        function.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-07 [0d2b1f305] Invent start_proc parameters for PL/Tcl.
-->
       <para>
        Add server parameters <xref linkend="guc-pltcl-start-proc">
        and <xref linkend="guc-pltclu-start-proc">, to allow initialization
        functions to be called on PL/Tcl startup (Tom Lane)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>
   </sect3>

   <sect3>
    <title>Client Interfaces</title>

    <itemizedlist>

     <listitem>
<!--
2016-11-03 [274bb2b38] libpq: Allow connection strings and URIs to specify mult
2017-05-19 [5f374fe7a] libpq: Try next host if one of them times out.
2017-07-10 [7b02ba62e] Allow multiple hostaddrs to go with multiple hostnames.
-->
      <para>
       Allow specification of <link linkend="libpq-connect-host">multiple
       host names or addresses</link> in libpq connection strings and URIs
       (Robert Haas, Heikki Linnakangas)
      </para>

      <para>
       libpq will connect to the first responsive server in the list.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-29 [721f7bd3c] libpq: Add target_session_attrs parameter.
-->
      <para>
       Allow libpq connection strings and URIs to request a <link
       linkend="libpq-connect-target-session-attrs">read/write host</link>,
       that is a master server rather than a standby server
       (Victor Wagner, Mithun Cy)
      </para>

      <para>
       This is useful when multiple host names are
       specified.  It is controlled by libpq connection parameter
       <option>target_session_attrs</option>.
      </para>
     </listitem>

     <listitem>
<!--
2017-01-24 [ba005f193] Allow password file name to be specified as a libpq conn
-->
      <para>
       Allow the <link linkend="libpq-connect-passfile">password file name</link>
       to be specified as a libpq connection parameter (Julian Markwort)
      </para>

      <para>
       Previously this could only be specified via an environment variable.
      </para>
     </listitem>

     <listitem>
<!--
2017-05-03 [8f8b9be51] Add PQencryptPasswordConn function to libpq, use it in p
-->
      <para>
       Add function <link
       linkend="libpq-pqencryptpasswordconn"><function>PQencryptPasswordConn()</function></link>
       to allow creation of more types of encrypted passwords on the
       client side (Michael Paquier, Heikki Linnakangas)
      </para>

      <para>
       Previously only <literal>MD5</literal>-encrypted passwords could be created
       using <link
       linkend="libpq-pqencryptpassword"><function>PQencryptPassword()</function></link>.
       This new function can also create <link
       linkend="auth-pg-hba-conf"><literal>SCRAM-SHA-256</literal></link>-encrypted
       passwords.
      </para>
     </listitem>

     <listitem>
<!--
2016-08-16 [a7b5573d6] Remove separate version numbering for ecpg preprocessor.
-->
      <para>
       Change <application>ecpg</application> preprocessor version from 4.12 to 10
       (Tom Lane)
      </para>

      <para>
       Henceforth the <application>ecpg</application> version will match
       the <productname>PostgreSQL</productname> distribution version number.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Client Applications</title>

    <sect4>
     <title><xref linkend="app-psql"></title>

     <itemizedlist>

      <listitem>
<!--
2017-03-30 [e984ef586] Support \if ... \elif ... \else ... \endif in psql scrip
2017-04-02 [5dbc5da11] Fix behavior of psql's \p to agree with \g, \w, etc.
2017-04-02 [68dba97a4] Document psql's behavior of recalling the previously exe
-->
       <para>
        Add conditional branch support to <application>psql</application> (Corey
        Huinker)
       </para>

       <para>
        This feature adds <application>psql</application>
        meta-commands <command>\if</command>, <command>\elif</command>, <command>\else</command>,
        and <command>\endif</command>.  This is primarily helpful for scripting.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-07 [b2678efd4] psql: Add \gx command
-->
       <para>
        Add <application>psql</application> <command>\gx</command> meta-command to execute
        (<command>\g</command>) a query in expanded mode (<command>\x</command>)
        (Christoph Berg)
       </para>
      </listitem>

      <listitem>
<!--
2017-04-01 [f833c847b] Allow psql variable substitution to occur in backtick co
-->
       <para>
        Expand <application>psql</application> variable references in
        backtick-executed strings (Tom Lane)
       </para>

       <para>
        This is particularly useful in the new <application>psql</application>
        conditional branch commands.
       </para>
      </listitem>

      <listitem>
<!--
2017-01-30 [511ae628f] Make psql reject attempts to set special variables to in
2017-02-01 [86322dc7e] Improve psql's behavior for \set and \unset of its contr
2017-02-02 [fd6cd6980] Clean up psql's behavior for a few more control variable
-->
       <para>
        Prevent <application>psql</application>'s special variables from being set to
        invalid values (Daniel V&eacute;rit&eacute;, Tom Lane)
       </para>

       <para>
        Previously, setting one of <application>psql</application>'s special variables
        to an invalid value silently resulted in the default behavior.
        <command>\set</command> on a special variable now fails if the proposed
        new value is invalid.  As a special exception, <command>\set</command>
        with an empty or omitted new value, on a boolean-valued special
        variable, still has the effect of setting the variable
        to <literal>on</literal>; but now it actually acquires that value rather
        than an empty string.  <command>\unset</command> on a special variable now
        explicitly sets the variable to its default value, which is also
        the value it acquires at startup.  In sum, a control variable now
        always has a displayable value that reflects
        what <application>psql</application> is actually doing.
       </para>
      </listitem>

      <listitem>
<!--
2017-09-06 [a6c678f01] Add psql variables showing server version and psql versi
-->
       <para>
        Add variables showing server version and <application>psql</application> version
        (Fabien Coelho)
       </para>
      </listitem>

      <listitem>
<!--
2016-11-03 [a0f357e57] psql: Split up "Modifiers" column in \d and \dD
-->
       <para>
        Improve <application>psql</application>'s <command>\d</command> (display relation)
        and <command>\dD</command> (display domain) commands to show collation,
        nullable, and default properties in separate columns (Peter
        Eisentraut)
       </para>

       <para>
        Previously they were shown in a single <quote>Modifiers</quote> column.
       </para>
      </listitem>

      <listitem>
<!--
2017-07-27 [77cb4a1d6] Standardize describe.c's behavior for no-matching-object
-->
       <para>
        Make the various <command>\d</command> commands handle no-matching-object
        cases more consistently (Daniel Gustafsson)
       </para>

       <para>
        They now all print the message about that to stderr, not stdout,
        and the message wording is more consistent.
       </para>
      </listitem>

      <listitem>
<!--
2016-08-18 [49917dbd7] Improve psql's tab completion for ALTER EXTENSION foo UP
2016-08-18 [8019b5a89] Improve psql's tab completion for \l.
2016-09-01 [76f9dd4fa] Improve tab completion for BEGIN & START|SET TRANSACTION
2016-09-11 [52803098a] psql tab completion for CREATE DATABASE ... TEMPLATE ...
2016-09-12 [63c1a8719] Fix recent commit for tab-completion of database templat
2016-11-03 [1d15d0db5] psql: Tab-complete LOCK [TABLE] ... IN {ACCESS|ROW|SHARE
2016-11-04 [927d7bb6b] Improve tab completion for CREATE TRIGGER.
2016-11-08 [577f0bdd2] psql: Tab completion for renaming enum values.
2017-03-01 [b5a388392] psql: Add tab completion for DEALLOCATE
2017-03-16 [d7d77f382] psql: Add completion for \help DROP|ALTER
-->
       <para>
        Improve <application>psql</application>'s tab completion (Jeff Janes,
        Ian Barwick, Andreas Karlsson, Sehrope Sarkuni, Thomas Munro,
        Kevin Grittner, Dagfinn Ilmari Manns&aring;ker)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title><xref linkend="pgbench"></title>

     <itemizedlist>

      <listitem>
<!--
2016-11-09 [41124a91e] pgbench: Allow the transaction log file prefix to be cha
-->
       <para>
        Add <application>pgbench</application> option <option>--log-prefix</option> to
        control the log file prefix (Masahiko Sawada)
       </para>
      </listitem>

      <listitem>
<!--
2017-01-20 [cdc2a7047] Allow backslash line continuations in pgbench's meta com
-->
       <para>
        Allow <application>pgbench</application>'s meta-commands to span multiple
        lines (Fabien Coelho)
       </para>

       <para>
        A meta-command can now be continued onto the next line by writing
        backslash-return.
       </para>
      </listitem>

      <listitem>
<!--
2017-08-11 [796818442] Remove pgbench's restriction on placement of -M switch.
-->
       <para>
        Remove restriction on placement of <option>-M</option> option relative to
        other command line options (Tom Lane)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

   <sect3>
    <title>Server Applications</title>

    <itemizedlist>

     <listitem>
<!--
2017-01-17 [cada1af31] Add compression support to pg_receivexlog
-->
      <para>
       Add <link
       linkend="app-pgreceivewal"><application>pg_receivewal</application></link>
       option <option>-Z</option>/<option>--compress</option> to specify compression
       (Michael Paquier)
      </para>
     </listitem>

     <listitem>
<!--
2017-01-04 [7c030783a] Add pg_recvlogical -\-endpos=LSN
-->
      <para>
       Add <link
       linkend="app-pgrecvlogical"><application>pg_recvlogical</application></link> option
       <option>--endpos</option> to specify the ending position (Craig Ringer)
      </para>

      <para>
       This complements the existing <option>--startpos</option> option.
      </para>
     </listitem>

     <listitem>
<!--
2016-10-19 [5d58c07a4] initdb pg_basebackup: Rename -\-noxxx options to -\-no-x
-->
      <para>
       Rename <link linkend="app-initdb"><application>initdb</application></link>
       options <option>--noclean</option> and <option>--nosync</option> to be spelled
       <option>--no-clean</option> and <option>--no-sync</option> (Vik Fearing,
       Peter Eisentraut)
      </para>

      <para>
       The old spellings are still supported.
      </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>
<!--
2016-09-20 [46b55e7f8] pg_restore: Add -N option to exclude schemas
-->
       <para>
        Allow <application>pg_restore</application> to exclude schemas (Michael Banck)
       </para>

       <para>
        This adds a new <option>-N</option>/<option>--exclude-schema</option> option.
       </para>
      </listitem>

      <listitem>
<!--
2016-11-29 [4fafa579b] Add -\-no-blobs option to pg_dump
-->
       <para>
        Add <option>--no-blobs</option> option to
        <application>pg_dump</application> (Guillaume Lelarge)
       </para>

       <para>
        This suppresses dumping of large objects.
       </para>
      </listitem>

      <listitem>
<!--
2017-03-07 [9a83d56b3] Allow pg_dumpall to dump roles w/o user passwords
-->
       <para>
        Add <application>pg_dumpall</application> option
        <option>--no-role-passwords</option> to omit role passwords
        (Robins Tharakan, Simon Riggs)
       </para>

       <para>
        This allows use of <application>pg_dumpall</application> by non-superusers;
        without this option, it fails due to inability to read passwords.
       </para>
      </listitem>

      <listitem>
<!--
2017-08-16 [e4892c681] pg_dump: Support using synchronized snapshots on standby
-->
       <para>
        Support using synchronized snapshots when dumping from a standby
        server (Petr Jelinek)
       </para>
      </listitem>

      <listitem>
<!--
2017-03-22 [96a7128b7] Sync pg_dump and pg_dumpall output
-->
       <para>
        Issue <function>fsync()</function> on the output files generated by
        <application>pg_dump</application> and
        <application>pg_dumpall</application> (Michael Paquier)
       </para>

       <para>
        This provides more security that the output is safely stored on
        disk before the program exits.  This can be disabled with
        the new <option>--no-sync</option> option.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>

    <title><xref linkend="app-pgbasebackup"></title>

     <itemizedlist>

      <listitem>
<!--
2016-10-23 [56c7d8d45] Allow pg_basebackup to stream transaction log in tar mod
2016-12-21 [ecbdc4c55] Forbid invalid combination of options in pg_basebackup.
-->
       <para>
        Allow <application>pg_basebackup</application> to stream write-ahead log in
        tar mode (Magnus Hagander)
       </para>

       <para>
        The <acronym>WAL</acronym> will be stored in a separate tar file from
        the base backup.
       </para>
      </listitem>

      <listitem>
<!--
2017-01-16 [e7b020f78] Make pg_basebackup use temporary replication slots
-->
       <para>
        Make <application>pg_basebackup</application> use temporary replication slots
        (Magnus Hagander)
       </para>

       <para>
        Temporary replication slots will be used by default when
        <application>pg_basebackup</application> uses WAL streaming with default
        options.
       </para>
      </listitem>

      <listitem>
<!--
2016-09-29 [bc34223bc] pg_basebackup pg_receivexlog: Issue fsync more carefully
-->
       <para>
        Be more careful about fsync'ing in all required places
        in <application>pg_basebackup</application> and
        <application>pg_receivewal</application> (Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2016-09-29 [6ed2d8584] pg_basebackup: Add -\-nosync option
2016-10-19 [5d58c07a4] initdb pg_basebackup: Rename -\-noxxx options to -\-no-x
-->
       <para>
        Add <application>pg_basebackup</application> option <option>--no-sync</option> to
        disable fsync (Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2016-09-28 [6ad8ac602] Exclude additional directories in pg_basebackup
-->
       <para>
        Improve <application>pg_basebackup</application>'s handling of which
        directories to skip (David Steele)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title><application><xref linkend="app-pg-ctl"></application></title>

     <itemizedlist>

      <listitem>
<!--
2016-09-21 [e7010ce47] pg_ctl: Add wait option to promote action
-->
       <para>
        Add wait option for <application><xref linkend="app-pg-ctl"></application>'s
        promote operation (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
2016-10-19 [0be22457d] pg_ctl: Add long options for -w and -W
-->
       <para>
        Add long options for <application>pg_ctl</application> wait (<option>--wait</option>)
        and no-wait (<option>--no-wait</option>) (Vik Fearing)
       </para>
      </listitem>

      <listitem>
<!--
2016-10-19 [caf936b09] pg_ctl: Add long option for -o
-->
       <para>
        Add long option for <application>pg_ctl</application> server options
        (<option>--options</option>) (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
2017-06-28 [f13ea95f9] Change pg_ctl to detect server-ready by watching status
-->
       <para>
        Make <literal>pg_ctl start --wait</literal> detect server-ready by
        watching <filename>postmaster.pid</filename>, not by attempting connections
        (Tom Lane)
       </para>

       <para>
        The postmaster has been changed to report its ready-for-connections
        status in <filename>postmaster.pid</filename>, and <application>pg_ctl</application>
        now examines that file to detect whether startup is complete.
        This is more efficient and reliable than the old method, and it
        eliminates postmaster log entries about rejected connection
        attempts during startup.
       </para>
      </listitem>

      <listitem>
<!--
2017-06-26 [c61559ec3] Reduce pg_ctl's reaction time when waiting for postmaste
-->
       <para>
        Reduce <application>pg_ctl</application>'s reaction time when waiting for
        postmaster start/stop (Tom Lane)
       </para>

       <para>
        <application>pg_ctl</application> now probes ten times per second when waiting
        for a postmaster state change, rather than once per second.
       </para>
      </listitem>

      <listitem>
<!--
2017-07-05 [1bac5f552] pg_ctl: Make failure to complete operation a nonzero exi
-->
       <para>
        Ensure that <application>pg_ctl</application> exits with nonzero status if an
        operation being waited for does not complete within the timeout
        (Peter Eisentraut)
       </para>

       <para>
        The <literal>start</literal> and <literal>promote</literal> operations now return
        exit status 1, not 0, in such cases.  The <literal>stop</literal> operation
        has always done that.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>
   </sect3>

   <sect3>
    <title>Source Code</title>

    <itemizedlist>

     <listitem>
<!--
2016-08-15 [ca9112a42] Stamp HEAD as 10devel.
-->
      <para>
       Change to two-part release version numbering (Peter Eisentraut, Tom
       Lane)
      </para>

      <para>
       Release numbers will now have two parts (e.g., <literal>10.1</literal>)
       rather than three (e.g., <literal>9.6.3</literal>).
       Major versions will now increase just the first number, and minor
       releases will increase just the second number.
       Release branches will be referred to by single numbers
       (e.g., <literal>10</literal> rather than <literal>9.6</literal>).
       This change is intended to reduce user confusion about what is a
       major or minor release of <productname>PostgreSQL</productname>.
      </para>
     </listitem>

     <listitem>
<!--
2017-06-16 [cea258b63] Teach pgindent to skip files generated by bison or flex
2017-06-21 [8ff6d4ec7] Adjust pgindent script to use pg_bsd_indent 2.0.
2017-06-21 [e3860ffa4] Initial pgindent run with pg_bsd_indent version 2.0.
2017-06-21 [c7b8998eb] Phase 2 of pgindent updates.
2017-06-21 [382ceffdf] Phase 3 of pgindent updates.
2017-06-21 [81f056c72] Remove entab and associated detritus.
-->
      <para>
       Improve behavior of <application>pgindent</application>
       (Piotr Stefaniak, Tom Lane)
      </para>

      <para>
       We have switched to a new version of <application>pg_bsd_indent</application>
       based on recent improvements made by the FreeBSD project.  This
       fixes numerous small bugs that led to odd C code formatting
       decisions.  Most notably, lines within parentheses (such as in a
       multi-line function call) are now uniformly indented to match the
       opening paren, even if that would result in code extending past the
       right margin.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-23 [eccfef81e] ICU support
-->
      <para>
       Allow the <link linkend="configure"><acronym>ICU</acronym></link> library to
       optionally be used for collation support (Peter Eisentraut)
      </para>

      <para>
       The <acronym>ICU</acronym> library has versioning that allows detection
       of collation changes between versions.  It is enabled via configure
       option <option>--with-icu</option>.  The default still uses the operating
       system's native collation library.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-04 [c8ead2a39] Provide DLLEXPORT markers for C functions via PG_FUNCTIO
-->
      <para>
       Automatically mark all <link
       linkend="xfunc-c"><function>PG_FUNCTION_INFO_V1</function></link> functions
       as <literal>DLLEXPORT</literal>-ed on
      <systemitem class="osname">Windows</systemitem> (Laurenz Albe)
      </para>

      <para>
       If third-party code is using <literal>extern</literal> function
       declarations, they should also add <literal>DLLEXPORT</literal> markers
       to those declarations.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-08 [1833f1a1c] Simplify code by getting rid of SPI_push, SPI_pop, SPI_r
-->
      <para>
       Remove <acronym>SPI</acronym> functions <function>SPI_push()</function>,
       <function>SPI_pop()</function>, <function>SPI_push_conditional()</function>,
       <function>SPI_pop_conditional()</function>,
       and <function>SPI_restore_connection()</function> as unnecessary (Tom Lane)
      </para>

      <para>
       Their functionality now happens automatically.  There are now no-op
       macros by these names so that external modules don't need to be
       updated immediately, but eventually such calls should be removed.
      </para>

      <para>
       A side effect of this change is that <function>SPI_palloc()</function> and
       allied functions now require an active SPI connection; they do not
       degenerate to simple <function>palloc()</function> if there is none.  That
       previous behavior was not very useful and posed risks of unexpected
       memory leaks.
      </para>
     </listitem>

     <listitem>
<!--
2016-12-02 [13e14a78e] Management of free memory pages.
2016-12-02 [13df76a53] Introduce dynamic shared memory areas.
2016-12-19 [e13029a5c] Provide a DSA area for all parallel queries.
-->
      <para>
       Allow shared memory to be dynamically allocated (Thomas Munro,
       Robert Haas)
      </para>
     </listitem>

     <listitem>
<!--
2017-02-27 [58b25e981] Add "Slab" MemoryContext implementation for efficient eq
-->
      <para>
       Add slab-like memory allocator for efficient fixed-size allocations
       (Tomas Vondra)
      </para>
     </listitem>

     <listitem>
<!--
2016-10-09 [ecb0d20a9] Use unnamed POSIX semaphores, if available, on Linux and
-->
      <para>
       Use <acronym>POSIX</acronym> semaphores rather than SysV semaphores
       on <systemitem class="osname">Linux</systemitem> and <systemitem
       class="osname">FreeBSD</systemitem> (Tom Lane)
      </para>

      <para>
       This avoids platform-specific limits on SysV semaphore usage.
      </para>
     </listitem>

     <listitem>
<!--
2017-04-07 [e8fdbd58f] Improve 64bit atomics support.
-->
      <para>
       Improve support for 64-bit atomics (Andres Freund)
      </para>
     </listitem>

     <listitem>
<!--
2017-03-10 [f8f1430ae] Enable 64 bit atomics on ARM64.
-->
      <para>
       Enable 64-bit atomic operations on <acronym>ARM64</acronym> (Roman
       Shaposhnik)
      </para>
     </listitem>

     <listitem>
<!--
2017-01-02 [1d63f7d2d] Use clock_gettime(), if available, in instr_time measure
-->
      <para>
       Switch to using <function>clock_gettime()</function>, if available, for
       duration measurements (Tom Lane)
      </para>

      <para>
       <function>gettimeofday()</function> is still used
       if <function>clock_gettime()</function> is not available.
      </para>
     </listitem>

     <listitem>
<!--
2016-12-05 [fe0a0b599] Replace PostmasterRandom() with a stronger source, secon
2017-07-03 [bf723a274] Forbid gen_random_uuid() with -\-disable-strong-random
-->
      <para>
       Add more robust random number generators to be used for
       cryptographically secure uses (Magnus Hagander, Michael Paquier,
       Heikki Linnakangas)
      </para>

      <para>
       If no strong random number generator can be
       found, <link linkend="configure">configure</link> will fail unless
       the <option>--disable-strong-random</option> option is used.  However, with
       this option, <link linkend="pgcrypto"><application>pgcrypto</application></link>
       functions requiring a strong random number generator will be disabled.
      </para>
     </listitem>

     <listitem>
<!--
2017-08-15 [d7ab908fb] Distinguish wait-for-connection from wait-for-write-read
-->
      <para>
       Allow <function>WaitLatchOrSocket()</function> to wait for socket
       connection on Windows (Andres Freund)
      </para>
     </listitem>

     <listitem>
<!--
2017-04-06 [3f902354b] Clean up after insufficiently-researched optimization of
-->
      <para>
       <filename>tupconvert.c</filename> functions no longer convert tuples just to
       embed a different composite-type OID in them (Ashutosh Bapat, Tom Lane)
      </para>

      <para>
       The majority of callers don't care about the composite-type OID;
       but if the result tuple is to be used as a composite Datum, steps
       should be taken to make sure the correct OID is inserted in it.
      </para>
     </listitem>

    <listitem>
<!--
2016-10-11 [2b860f52e] Remove "sco" and "unixware" ports.
-->
     <para>
      Remove <systemitem class="osname">SCO</systemitem> and <systemitem
      class="osname">Unixware</systemitem> ports (Tom Lane)
     </para>
    </listitem>

     <listitem>
<!--
2016-08-18 [e8306745e] doc: Speed up XSLT builds
2016-08-24 [0e4cc1fc5] doc: Fix XSLT speedup with older upstream stylesheet ver
-->
      <para>
       Overhaul documentation <link linkend="docguide-toolsets">build
       process</link> (Alexander Lakhin)
      </para>
     </listitem>

     <listitem>
<!--
2017-04-06 [510074f9f] Remove use of Jade and DSSSL
-->
      <para>
       Use <acronym>XSLT</acronym> to build the <productname>PostgreSQL</productname>
       documentation (Peter Eisentraut)
      </para>

      <para>
       Previously <application>Jade</application>, <acronym>DSSSL</acronym>, and
       <application>JadeTex</application> were used.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-15 [e36ddab11] Build HTML documentation using XSLT stylesheets by defau
-->
      <para>
       Build <acronym>HTML</acronym> documentation using <acronym>XSLT</acronym>
       stylesheets by default (Peter Eisentraut)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3>
    <title>Additional Modules</title>

    <itemizedlist>

     <listitem>
<!--
2016-09-29 [8e91e12bc] Allow contrib/file_fdw to read from a program, like COPY
-->
      <para>
       Allow <link linkend="file-fdw"><application>file_fdw</application></link> to read
       from program output as well as files (Corey Huinker, Adam Gomaa)
      </para>
     </listitem>

     <listitem>
<!--
2016-10-21 [7012b132d] postgres_fdw: Push down aggregates to remote servers.
-->
      <para>
       In <link linkend="postgres-fdw"><application>postgres_fdw</application></link>,
       push aggregate functions to the remote server, when possible
       (Jeevan Chalke, Ashutosh Bapat)
      </para>

      <para>
       This reduces the amount of data that must be passed from the remote
       server, and offloads aggregate computation from the requesting server.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-16 [b30fb56b0] postgres_fdw: Push down FULL JOINs with restriction clau
2017-04-24 [332bec1e6] postgres_fdw: Fix join push down with extensions
-->
      <para>
       In <application>postgres_fdw</application>, push joins to the remote server in
       more cases (David Rowley, Ashutosh Bapat, Etsuro Fujita)
      </para>
     </listitem>

     <listitem>
<!--
2016-08-26 [ae025a159] Support OID system column in postgres_fdw.
-->
      <para>
       Properly support <type>OID</type> columns in
       <application>postgres_fdw</application> tables (Etsuro Fujita)
      </para>

      <para>
       Previously <type>OID</type> columns always returned zeros.
      </para>
     </listitem>

     <listitem>
<!--
2017-03-21 [f7946a92b] Add btree_gist support for enum types.
-->
      <para>
       Allow <link linkend="btree-gist"><application>btree_gist</application></link>
       and <link linkend="btree-gin"><application>btree_gin</application></link> to
       index enum types (Andrew Dunstan)
      </para>

      <para>
       This allows enums to be used in exclusion constraints.
      </para>
     </listitem>

     <listitem>
<!--
2016-11-29 [11da83a0e] Add uuid to the set of types supported by contrib/btree_
-->
      <para>
       Add indexing support to <application>btree_gist</application> for the
       <type>UUID</type> data type (Paul Jungwirth)
      </para>
     </listitem>

     <listitem>
<!--
2017-03-09 [3717dc149] Add amcheck extension to contrib.
-->
      <para>
       Add <link linkend="amcheck"><application>amcheck</application></link> which can
       check the validity of B-tree indexes (Peter Geoghegan)
      </para>
     </listitem>

     <listitem>
<!--
2017-03-27 [a6f22e835] Show ignored constants as "$N" rather than "?" in pg_sta
-->
      <para>
       Show ignored constants as <literal>$N</literal> rather than <literal>?</literal>
       in
      <link
      linkend="pgstatstatements"><application>pg_stat_statements</application></link>
      (Lukas Fittl)
      </para>
     </listitem>

     <listitem>
<!--
2016-09-27 [f31a931fa] Improve contrib/cube's handling of zero-D cubes, infinit
-->
      <para>
       Improve <link linkend="cube"><application>cube</application></link>'s handling
       of zero-dimensional cubes (Tom Lane)
      </para>

      <para>
       This also improves handling of <literal>infinite</literal> and
       <literal>NaN</literal> values.
      </para>
     </listitem>

     <listitem>
<!--
2016-09-29 [6e654546f] Don't bother to lock bufmgr partitions in pg_buffercache
-->
      <para>
       Allow <link
       linkend="pgbuffercache"><application>pg_buffercache</application></link> to run
       with fewer locks (Ivan Kartyshov)
      </para>

      <para>
       This makes it less disruptive when run on production systems.
      </para>
     </listitem>

     <listitem>
<!--
2017-02-03 [e759854a0] pgstattuple: Add pgstathashindex.
-->
      <para>
       Add <link linkend="pgstattuple"><application>pgstattuple</application></link>
       function <function>pgstathashindex()</function> to view hash index
       statistics (Ashutosh Sharma)
      </para>
     </listitem>

     <listitem>
<!--
2016-09-29 [fd321a1df] Remove superuser checks in pgstattuple
-->
      <para>
       Use <command>GRANT</command> permissions to
       control <application>pgstattuple</application> function usage (Stephen Frost)
      </para>

      <para>
       This allows DBAs to allow non-superusers to run these functions.
      </para>
     </listitem>

     <listitem>
<!--
2016-10-28 [d4b5d4cad] pgstattuple: Don't take heavyweight locks when examining
-->
      <para>
       Reduce locking when <application>pgstattuple</application> examines hash
       indexes (Amit Kapila)
      </para>
     </listitem>

     <listitem>
<!--
2017-03-17 [fef2bcdcb] pageinspect: Add page_checksum function
-->
      <para>
       Add <link linkend="pageinspect"><application>pageinspect</application></link>
       function <function>page_checksum()</function> to show a page's checksum
       (Tomas Vondra)
      </para>
     </listitem>

     <listitem>
<!--
2017-04-04 [193f5f9e9] pageinspect: Add bt_page_items function with bytea argum
-->
      <para>
       Add <application>pageinspect</application>
       function <function>bt_page_items()</function> to print page items from a
       page image (Tomas Vondra)
      </para>
     </listitem>

     <listitem>
<!--
2017-02-02 [08bf6e529] pageinspect: Support hash indexes.
-->
      <para>
       Add hash index support to <application>pageinspect</application> (Jesper
       Pedersen, Ashutosh Sharma)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

  </sect2>

  <sect2>
   <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>Adam Brightwell</member>
    <member>Adam Brusselback</member>
    <member>Adam Gomaa</member>
    <member>Adam Sah</member>
    <member>Adrian Klaver</member>
    <member>Aidan Van Dyk</member>
    <member>Aleksander Alekseev</member>
    <member>Alexander Korotkov</member>
    <member>Alexander Lakhin</member>
    <member>Alexander Sosna</member>
    <member>Alexey Bashtanov</member>
    <member>Alexey Grishchenko</member>
    <member>Alexey Isayko</member>
    <member>&Aacute;lvaro Hern&aacute;ndez Tortosa</member>
    <member>&Aacute;lvaro Herrera</member>
    <member>Amit Kapila</member>
    <member>Amit Khandekar</member>
    <member>Amit Langote</member>
    <member>Amul Sul</member>
    <member>Anastasia Lubennikova</member>
    <member>Andreas Joseph Krogh</member>
    <member>Andreas Karlsson</member>
    <member>Andreas Scherbaum</member>
    <member>Andreas Seltenreich</member>
    <member>Andres Freund</member>
    <member>Andrew Dunstan</member>
    <member>Andrew Gierth</member>
    <member>Andrew Wheelwright</member>
    <member>Andrey Borodin</member>
    <member>Andrey Lizenko</member>
    <member>Andy Abelisto</member>
    <member>Antonin Houska</member>
    <member>Ants Aasma</member>
    <member>Arjen Nienhuis</member>
    <member>Arseny Sher</member>
    <member>Artur Zakirov</member>
    <member>Ashutosh Bapat</member>
    <member>Ashutosh Sharma</member>
    <member>Ashwin Agrawal</member>
    <member>Atsushi Torikoshi</member>
    <member>Ayumi Ishii</member>
    <member>Basil Bourque</member>
    <member>Beena Emerson</member>
    <member>Ben de Graaff</member>
    <member>Benedikt Grundmann</member>
    <member>Bernd Helmle</member>
    <member>Brad DeJong</member>
    <member>Brandur Leach</member>
    <member>Breen Hagan</member>
    <member>Bruce Momjian</member>
    <member>Bruno Wolff III</member>
    <member>Catalin Iacob</member>
    <member>Chapman Flack</member>
    <member>Chen Huajun</member>
    <member>Choi Doo-Won</member>
    <member>Chris Bandy</member>
    <member>Chris Richards</member>
    <member>Chris Ruprecht</member>
    <member>Christian Ullrich</member>
    <member>Christoph Berg</member>
    <member>Chuanting Wang</member>
    <member>Claudio Freire</member>
    <member>Clinton Adams</member>
    <member>Const Zhang</member>
    <member>Constantin Pan</member>
    <member>Corey Huinker</member>
    <member>Craig Ringer</member>
    <member>Cynthia Shang</member>
    <member>Dagfinn Ilmari Manns&aring;ker</member>
    <member>Daisuke Higuchi</member>
    <member>Damian Quiroga</member>
    <member>Dan Wood</member>
    <member>Dang Minh Huong</member>
    <member>Daniel Gustafsson</member>
    <member>Daniel V&eacute;rit&eacute;</member>
    <member>Daniel Westermann</member>
    <member>Daniele Varrazzo</member>
    <member>Danylo Hlynskyi</member>
    <member>Darko Prelec</member>
    <member>Dave Cramer</member>
    <member>Dave Page</member>
    <member>David Christensen</member>
    <member>David Fetter</member>
    <member>David Johnston</member>
    <member>David Rader</member>
    <member>David Rowley</member>
    <member>David Steele</member>
    <member>Dean Rasheed</member>
    <member>Denis Smirnov</member>
    <member>Denish Patel</member>
    <member>Dennis Bj&ouml;rklund</member>
    <member>Devrim G&uuml;nd&uuml;z</member>
    <member>Dilip Kumar</member>
    <member>Dilyan Palauzov</member>
    <member>Dima Pavlov</member>
    <member>Dimitry Ivanov</member>
    <member>Dmitriy Sarafannikov</member>
    <member>Dmitry Dolgov</member>
    <member>Dmitry Fedin</member>
    <member>Don Morrison</member>
    <member>Egor Rogov</member>
    <member>Eiji Seki</member>
    <member>Emil Iggland</member>
    <member>Emre Hasegeli</member>
    <member>Enrique Meneses</member>
    <member>Erik Nordstr&ouml;m</member>
    <member>Erik Rijkers</member>
    <member>Erwin Brandstetter</member>
    <member>Etsuro Fujita</member>
    <member>Eugen Konkov</member>
    <member>Eugene Kazakov</member>
    <member>Euler Taveira</member>
    <member>Fabien Coelho</member>
    <member>Fabr&iacute;zio de Royes Mello</member>
    <member>Feike Steenbergen</member>
    <member>Felix Gerzaguet</member>
    <member>Filip Jirs&aacute;k</member>
    <member>Fujii Masao</member>
    <member>Gabriele Bartolini</member>
    <member>Gabrielle Roth</member>
    <member>Gao Zengqi</member>
    <member>Gerdan Santos</member>
    <member>Gianni Ciolli</member>
    <member>Gilles Darold</member>
    <member>Giuseppe Broccolo</member>
    <member>Graham Dutton</member>
    <member>Greg Atkins</member>
    <member>Greg Burek</member>
    <member>Grigory Smolkin</member>
    <member>Guillaume Lelarge</member>
    <member>Hans Buschmann</member>
    <member>Haribabu Kommi</member>
    <member>Heikki Linnakangas</member>
    <member>Henry Boehlert</member>
    <member>Huan Ruan</member>
    <member>Ian Barwick</member>
    <member>Igor Korot</member>
    <member>Ildus Kurbangaliev</member>
    <member>Ivan Kartyshov</member>
    <member>Jaime Casanova</member>
    <member>Jakob Egger</member>
    <member>James Parks</member>
    <member>Jarred Ward</member>
    <member>Jason Li</member>
    <member>Jason O'Donnell</member>
    <member>Jason Petersen</member>
    <member>Jeevan Chalke</member>
    <member>Jeevan Ladhe</member>
    <member>Jeff Dafoe</member>
    <member>Jeff Davis</member>
    <member>Jeff Janes</member>
    <member>Jelte Fennema</member>
    <member>Jeremy Finzel</member>
    <member>Jeremy Schneider</member>
    <member>Jeroen van der Ham</member>
    <member>Jesper Pedersen</member>
    <member>Jim Mlodgenski</member>
    <member>Jim Nasby</member>
    <member>Jinyu Zhang</member>
    <member>Joe Conway</member>
    <member>Joel Jacobson</member>
    <member>John Harvey</member>
    <member>Jon Nelson</member>
    <member>Jordan Gigov</member>
    <member>Josh Berkus</member>
    <member>Josh Soref</member>
    <member>Julian Markwort</member>
    <member>Julien Rouhaud</member>
    <member>Junseok Yang</member>
    <member>Justin Muise</member>
    <member>Justin Pryzby</member>
    <member>Kacper Zuk</member>
    <member>KaiGai Kohei</member>
    <member>Karen Huddleston</member>
    <member>Karl Lehenbauer</member>
    <member>Karl O. Pinc</member>
    <member>Keith Fiske</member>
    <member>Kevin Grittner</member>
    <member>Kim Rose Carlsen</member>
    <member>Konstantin Evteev</member>
    <member>Konstantin Knizhnik</member>
    <member>Kuntal Ghosh</member>
    <member>Kurt Kartaltepe</member>
    <member>Kyle Conroy</member>
    <member>Kyotaro Horiguchi</member>
    <member>Laurenz Albe</member>
    <member>Leonardo Cecchi</member>
    <member>Ludovic Vaugeois-Pepin</member>
    <member>Lukas Fittl</member>
    <member>Magnus Hagander</member>
    <member>Maksim Milyutin</member>
    <member>Maksym Sobolyev</member>
    <member>Marc Rassbach</member>
    <member>Marc-Olaf Jaschke</member>
    <member>Marcos Castedo</member>
    <member>Marek Cvoren</member>
    <member>Mark Dilger</member>
    <member>Mark Kirkwood</member>
    <member>Mark Pether</member>
    <member>Marko Tiikkaja</member>
    <member>Markus Winand</member>
    <member>Marllius Ribeiro</member>
    <member>Marti Raudsepp</member>
    <member>Mart&iacute;n Marqu&eacute;s</member>
    <member>Masahiko Sawada</member>
    <member>Matheus Oliveira</member>
    <member>Mathieu Fenniak</member>
    <member>Merlin Moncure</member>
    <member>Michael Banck</member>
    <member>Michael Day</member>
    <member>Michael Meskes</member>
    <member>Michael Overmeyer</member>
    <member>Michael Paquier</member>
    <member>Mike Palmiotto</member>
    <member>Milos Urbanek</member>
    <member>Mithun Cy</member>
    <member>Moshe Jacobson</member>
    <member>Murtuza Zabuawala</member>
    <member>Naoki Okano</member>
    <member>Nathan Bossart</member>
    <member>Nathan Wagner</member>
    <member>Neha Khatri</member>
    <member>Neha Sharma</member>
    <member>Neil Anderson</member>
    <member>Nicolas Baccelli</member>
    <member>Nicolas Guini</member>
    <member>Nicolas Thauvin</member>
    <member>Nikhil Sontakke</member>
    <member>Nikita Glukhov</member>
    <member>Nikolaus Thiel</member>
    <member>Nikolay Nikitin</member>
    <member>Nikolay Shaplov</member>
    <member>Noah Misch</member>
    <member>Noriyoshi Shinoda</member>
    <member>Olaf Gawenda</member>
    <member>Oleg Bartunov</member>
    <member>Oskari Saarenmaa</member>
    <member>Otar Shavadze</member>
    <member>Paresh More</member>
    <member>Paul Jungwirth</member>
    <member>Paul Ramsey</member>
    <member>Pavan Deolasee</member>
    <member>Pavel Golub</member>
    <member>Pavel Han&aacute;k</member>
    <member>Pavel Raiskup</member>
    <member>Pavel Stehule</member>
    <member>Peng Sun</member>
    <member>Peter Eisentraut</member>
    <member>Peter Geoghegan</member>
    <member>Petr Jel&iacute;nek</member>
    <member>Philippe Beaudoin</member>
    <member>Pierre-Emmanuel Andr&eacute;</member>
    <member>Piotr Stefaniak</member>
    <member>Prabhat Sahu</member>
    <member>QL Zhuo</member>
    <member>Radek Slupik</member>
    <member>Rafa de la Torre</member>
    <member>Rafia Sabih</member>
    <member>Ragnar Ouchterlony</member>
    <member>Rahila Syed</member>
    <member>Rajkumar Raghuwanshi</member>
    <member>Regina Obe</member>
    <member>Richard Pistole</member>
    <member>Robert Haas</member>
    <member>Robins Tharakan</member>
    <member>Rod Taylor</member>
    <member>Roman Shaposhnik</member>
    <member>Rushabh Lathia</member>
    <member>Ryan Murphy</member>
    <member>Sandeep Thakkar</member>
    <member>Scott Milliken</member>
    <member>Sean Farrell</member>
    <member>Sebastian Luque</member>
    <member>Sehrope Sarkuni</member>
    <member>Sergey Burladyan</member>
    <member>Sergey Koposov</member>
    <member>Shay Rojansky</member>
    <member>Shinichi Matsuda</member>
    <member>Sho Kato</member>
    <member>Simon Riggs</member>
    <member>Simone Gotti</member>
    <member>Spencer Thomason</member>
    <member>Stas Kelvich</member>
    <member>Stepan Pesternikov</member>
    <member>Stephen Frost</member>
    <member>Steve Randall</member>
    <member>Steve Singer</member>
    <member>Steven Fackler</member>
    <member>Steven Winfield</member>
    <member>Suraj Kharage</member>
    <member>Sveinn Sveinsson</member>
    <member>Sven R. Kunze</member>
    <member>Tahir Fakhroutdinov</member>
    <member>Taiki Kondo</member>
    <member>Takayuki Tsunakawa</member>
    <member>Takeshi Ideriha</member>
    <member>Tatsuo Ishii</member>
    <member>Tatsuro Yamada</member>
    <member>Teodor Sigaev</member>
    <member>Thom Brown</member>
    <member>Thomas Kellerer</member>
    <member>Thomas Munro</member>
    <member>Tim Goodaire</member>
    <member>Tobias Bussmann</member>
    <member>Tom Dunstan</member>
    <member>Tom Lane</member>
    <member>Tom van Tilburg</member>
    <member>Tomas Vondra</member>
    <member>Tomonari Katsumata</member>
    <member>Tushar Ahuja</member>
    <member>Vaishnavi Prabakaran</member>
    <member>Venkata Balaji Nagothi</member>
    <member>Vicky Vergara</member>
    <member>Victor Wagner</member>
    <member>Vik Fearing</member>
    <member>Vinayak Pokale</member>
    <member>Viren Negi</member>
    <member>Vitaly Burovoy</member>
    <member>Vladimir Kunshchikov</member>
    <member>Vladimir Rusinov</member>
    <member>Yi Wen Wong</member>
    <member>Yugo Nagata</member>
    <member>Zhen Ming Yang</member>
    <member>Zhou Digoal</member>
   </simplelist>
  </sect2>

 </sect1>
