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 <sect1 id="release-9-5-9">
  <title>Release 9.5.9</title>

  <formalpara>
  <title>Release date:</title>
  <para>2017-08-31</para>
  </formalpara>

  <para>
   This release contains a small number of fixes from 9.5.8.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.9</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 9.5.8,
    see <xref linkend="release-9-5-8">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
     <para>
      Show foreign tables
      in <structname>information_schema</>.<structname>table_privileges</>
      view (Peter Eisentraut)
     </para>

     <para>
      All other relevant <structname>information_schema</> views include
      foreign tables, but this one ignored them.
     </para>

     <para>
      Since this view definition is installed by <application>initdb</>,
      merely upgrading will not fix the problem.  If you need to fix this
      in an existing installation, you can, as a superuser, do this
      in <application>psql</>:
<programlisting>
BEGIN;
DROP SCHEMA information_schema CASCADE;
\i <replaceable>SHAREDIR</>/information_schema.sql
COMMIT;
</programlisting>
      (Run <literal>pg_config --sharedir</> if you're uncertain
      where <replaceable>SHAREDIR</> is.)  This must be repeated in each
      database to be fixed.
     </para>
    </listitem>

    <listitem>
     <para>
      Clean up handling of a fatal exit (e.g., due to receipt
      of <systemitem>SIGTERM</>) that occurs while trying to execute
      a <command>ROLLBACK</> of a failed transaction (Tom Lane)
     </para>

     <para>
      This situation could result in an assertion failure.  In production
      builds, the exit would still occur, but it would log an unexpected
      message about <quote>cannot drop active portal</>.
     </para>
    </listitem>

    <listitem>
     <para>
      Remove assertion that could trigger during a fatal exit (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Correctly identify columns that are of a range type or domain type over
      a composite type or domain type being searched for (Tom Lane)
     </para>

     <para>
      Certain <command>ALTER</> commands that change the definition of a
      composite type or domain type are supposed to fail if there are any
      stored values of that type in the database, because they lack the
      infrastructure needed to update or check such values.  Previously,
      these checks could miss relevant values that are wrapped inside range
      types or sub-domains, possibly allowing the database to become
      inconsistent.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix crash in <application>pg_restore</> when using parallel mode and
      using a list file to select a subset of items to restore
      (Fabr&iacute;zio de Royes Mello)
     </para>
    </listitem>

    <listitem>
     <para>
      Change <application>ecpg</>'s parser to allow <literal>RETURNING</>
      clauses without attached C variables (Michael Meskes)
     </para>

     <para>
      This allows <application>ecpg</> programs to contain SQL constructs
      that use <literal>RETURNING</> internally (for example, inside a CTE)
      rather than using it to define values to be returned to the client.
     </para>
    </listitem>

    <listitem>
     <para>
      Improve selection of compiler flags for PL/Perl on Windows (Tom Lane)
     </para>

     <para>
      This fix avoids possible crashes of PL/Perl due to inconsistent
      assumptions about the width of <type>time_t</> values.
      A side-effect that may be visible to extension developers is
      that <literal>_USE_32BIT_TIME_T</> is no longer defined globally
      in <productname>PostgreSQL</> Windows builds.  This is not expected
      to cause problems, because type <type>time_t</> is not used
      in any <productname>PostgreSQL</> API definitions.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <literal>make check</> to behave correctly when invoked via a
      non-GNU make program (Thomas Munro)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-8">
  <title>Release 9.5.8</title>

  <formalpara>
  <title>Release date:</title>
  <para>2017-08-10</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.7.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.8</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if you use foreign data servers that make use of user
    passwords for authentication, see the first changelog entry below.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 9.5.7,
    see <xref linkend="release-9-5-7">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
     <para>
      Further restrict visibility
      of <structname>pg_user_mappings</>.<structfield>umoptions</>, to
      protect passwords stored as user mapping options
      (Noah Misch)
     </para>

     <para>
      The fix for CVE-2017-7486 was incorrect: it allowed a user
      to see the options in her own user mapping, even if she did not
      have <literal>USAGE</> permission on the associated foreign server.
      Such options might include a password that had been provided by the
      server owner rather than the user herself.
      Since <structname>information_schema.user_mapping_options</> does not
      show the options in such cases, <structname>pg_user_mappings</>
      should not either.
      (CVE-2017-7547)
     </para>

     <para>
      By itself, this patch will only fix the behavior in newly initdb'd
      databases.  If you wish to apply this change in an existing database,
      you will need to do the following:
     </para>

     <procedure>
      <step>
       <para>
        Restart the postmaster after adding <literal>allow_system_table_mods
        = true</> to <filename>postgresql.conf</>.  (In versions
        supporting <command>ALTER SYSTEM</>, you can use that to make the
        configuration change, but you'll still need a restart.)
       </para>
      </step>

      <step>
       <para>
        In <emphasis>each</> database of the cluster,
        run the following commands as superuser:
<programlisting>
SET search_path = pg_catalog;
CREATE OR REPLACE VIEW pg_user_mappings AS
    SELECT
        U.oid       AS umid,
        S.oid       AS srvid,
        S.srvname   AS srvname,
        U.umuser    AS umuser,
        CASE WHEN U.umuser = 0 THEN
            'public'
        ELSE
            A.rolname
        END AS usename,
        CASE WHEN (U.umuser &lt;&gt; 0 AND A.rolname = current_user
                     AND (pg_has_role(S.srvowner, 'USAGE')
                          OR has_server_privilege(S.oid, 'USAGE')))
                    OR (U.umuser = 0 AND pg_has_role(S.srvowner, 'USAGE'))
                    OR (SELECT rolsuper FROM pg_authid WHERE rolname = current_user)
                    THEN U.umoptions
                 ELSE NULL END AS umoptions
    FROM pg_user_mapping U
         LEFT JOIN pg_authid A ON (A.oid = U.umuser) JOIN
        pg_foreign_server S ON (U.umserver = S.oid);
</programlisting>
       </para>
      </step>

      <step>
       <para>
        Do not forget to include the <literal>template0</>
        and <literal>template1</> databases, or the vulnerability will still
        exist in databases you create later.  To fix <literal>template0</>,
        you'll need to temporarily make it accept connections.
        In <productname>PostgreSQL</> 9.5 and later, you can use
<programlisting>
ALTER DATABASE template0 WITH ALLOW_CONNECTIONS true;
</programlisting>
        and then after fixing <literal>template0</>, undo that with
<programlisting>
ALTER DATABASE template0 WITH ALLOW_CONNECTIONS false;
</programlisting>
        In prior versions, instead use
<programlisting>
UPDATE pg_database SET datallowconn = true WHERE datname = 'template0';
UPDATE pg_database SET datallowconn = false WHERE datname = 'template0';
</programlisting>
       </para>
      </step>

      <step>
       <para>
        Finally, remove the <literal>allow_system_table_mods</> configuration
        setting, and again restart the postmaster.
       </para>
      </step>
     </procedure>
    </listitem>

    <listitem>
     <para>
      Disallow empty passwords in all password-based authentication methods
      (Heikki Linnakangas)
     </para>

     <para>
      <application>libpq</> ignores empty password specifications, and does
      not transmit them to the server.  So, if a user's password has been
      set to the empty string, it's impossible to log in with that password
      via <application>psql</> or other <application>libpq</>-based
      clients.  An administrator might therefore believe that setting the
      password to empty is equivalent to disabling password login.
      However, with a modified or non-<application>libpq</>-based client,
      logging in could be possible, depending on which authentication
      method is configured.  In particular the most common
      method, <literal>md5</>, accepted empty passwords.
      Change the server to reject empty passwords in all cases.
      (CVE-2017-7546)
     </para>
    </listitem>

    <listitem>
     <para>
      Make <function>lo_put()</> check for <literal>UPDATE</> privilege on
      the target large object (Tom Lane, Michael Paquier)
     </para>

     <para>
      <function>lo_put()</> should surely require the same permissions
      as <function>lowrite()</>, but the check was missing, allowing any
      user to change the data in a large object.
      (CVE-2017-7548)
     </para>
    </listitem>

    <listitem>
     <para>
      Correct the documentation about the process for upgrading standby
      servers with <application>pg_upgrade</> (Bruce Momjian)
     </para>

     <para>
      The previous documentation instructed users to start/stop the primary
      server after running <application>pg_upgrade</> but before syncing
      the standby servers.  This sequence is unsafe.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix concurrent locking of tuple update chains (&Aacute;lvaro Herrera)
     </para>

     <para>
      If several sessions concurrently lock a tuple update chain with
      nonconflicting lock modes using an old snapshot, and they all
      succeed, it was possible for some of them to nonetheless fail (and
      conclude there is no live tuple version) due to a race condition.
      This had consequences such as foreign-key checks failing to see a
      tuple that definitely exists but is being updated concurrently.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix potential data corruption when freezing a tuple whose XMAX is a
      multixact with exactly one still-interesting member (Teodor Sigaev)
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid integer overflow and ensuing crash when sorting more than one
      billion tuples in-memory (Sergey Koposov)
     </para>
    </listitem>

    <listitem>
     <para>
      On Windows, retry process creation if we fail to reserve the address
      range for our shared memory in the new process (Tom Lane, Amit
      Kapila)
     </para>

     <para>
      This is expected to fix infrequent child-process-launch failures that
      are probably due to interference from antivirus products.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix low-probability corruption of shared predicate-lock hash table
      in Windows builds (Thomas Munro, Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid logging clean closure of an SSL connection as though
      it were a connection reset (Michael Paquier)
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent sending SSL session tickets to clients (Tom Lane)
     </para>

     <para>
      This fix prevents reconnection failures with ticket-aware client-side
      SSL code.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix code for setting <xref linkend="guc-tcp-keepalives-idle"> on
      Solaris (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix statistics collector to honor inquiry messages issued just after
      a postmaster shutdown and immediate restart (Tom Lane)
     </para>

     <para>
      Statistics inquiries issued within half a second of the previous
      postmaster shutdown were effectively ignored.
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that the statistics collector's receive buffer size is at
      least 100KB (Tom Lane)
     </para>

     <para>
      This reduces the risk of dropped statistics data on older platforms
      whose default receive buffer size is less than that.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possible creation of an invalid WAL segment when a standby is
      promoted just after it processes an <literal>XLOG_SWITCH</> WAL
      record (Andres Freund)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>walsender</> to exit promptly when client requests
      shutdown (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <systemitem>SIGHUP</> and <systemitem>SIGUSR1</> handling in
      walsender processes (Petr Jelinek, Andres Freund)
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent walsender-triggered panics during shutdown checkpoints
      (Andres Freund, Michael Paquier)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix unnecessarily slow restarts of <application>walreceiver</>
      processes due to race condition in postmaster (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix leakage of small subtransactions spilled to disk during logical
      decoding (Andres Freund)
     </para>

     <para>
      This resulted in temporary files consuming excessive disk space.
     </para>
    </listitem>

    <listitem>
     <para>
      Reduce the work needed to build snapshots during creation of
      logical-decoding slots (Andres Freund, Petr Jelinek)
     </para>

     <para>
      The previous algorithm was infeasibly expensive on a server with a
      lot of open transactions.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix race condition that could indefinitely delay creation of
      logical-decoding slots (Andres Freund, Petr Jelinek)
     </para>
    </listitem>

    <listitem>
     <para>
      Reduce overhead in processing syscache invalidation events (Tom Lane)
     </para>

     <para>
      This is particularly helpful for logical decoding, which triggers
      frequent cache invalidation.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix cases where an <command>INSERT</> or <command>UPDATE</> assigns
      to more than one element of a column that is of domain-over-array
      type (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Allow window functions to be used in sub-<literal>SELECT</>s that
      are within the arguments of an aggregate function (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Move autogenerated array types out of the way during
      <command>ALTER ... RENAME</> (Vik Fearing)
     </para>

     <para>
      Previously, we would rename a conflicting autogenerated array type
      out of the way during <command>CREATE</>; this fix extends that
      behavior to renaming operations.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix dangling pointer in <command>ALTER TABLE</> when there is a
      comment on a constraint belonging to the table (David Rowley)
     </para>

     <para>
      Re-applying the comment to the reconstructed constraint could fail
      with a weird error message, or even crash.
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that <command>ALTER USER ... SET</> accepts all the syntax
      variants that <command>ALTER ROLE ... SET</> does (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
     <para>
      Properly update dependency info when changing a datatype I/O
      function's argument or return type from <type>opaque</> to the
      correct type (Heikki Linnakangas)
     </para>

     <para>
      <command>CREATE TYPE</> updates I/O functions declared in this
      long-obsolete style, but it forgot to record a dependency on the
      type, allowing a subsequent <command>DROP TYPE</> to leave broken
      function definitions behind.
     </para>
    </listitem>

    <listitem>
     <para>
      Reduce memory usage when <command>ANALYZE</> processes
      a <type>tsvector</> column (Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix unnecessary precision loss and sloppy rounding when multiplying
      or dividing <type>money</> values by integers or floats (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Tighten checks for whitespace in functions that parse identifiers,
      such as <function>regprocedurein()</> (Tom Lane)
     </para>

     <para>
      Depending on the prevailing locale, these functions could
      misinterpret fragments of multibyte characters as whitespace.
     </para>
    </listitem>

    <listitem>
     <para>
      Use relevant <literal>#define</> symbols from Perl while
      compiling <application>PL/Perl</> (Ashutosh Sharma, Tom Lane)
     </para>

     <para>
      This avoids portability problems, typically manifesting as
      a <quote>handshake</> mismatch during library load, when working with
      recent Perl versions.
     </para>
    </listitem>

    <listitem>
     <para>
      In <application>libpq</>, reset GSS/SASL and SSPI authentication
      state properly after a failed connection attempt (Michael Paquier)
     </para>

     <para>
      Failure to do this meant that when falling back from SSL to non-SSL
      connections, a GSS/SASL failure in the SSL attempt would always cause
      the non-SSL attempt to fail.  SSPI did not fail, but it leaked memory.
     </para>
    </listitem>

    <listitem>
     <para>
      In <application>psql</>, fix failure when <command>COPY FROM STDIN</>
      is ended with a keyboard EOF signal and then another <command>COPY
      FROM STDIN</> is attempted (Thomas Munro)
     </para>

     <para>
      This misbehavior was observed on BSD-derived platforms (including
      macOS), but not on most others.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_dump</> and <application>pg_restore</> to
      emit <command>REFRESH MATERIALIZED VIEW</> commands last (Tom Lane)
     </para>

     <para>
      This prevents errors during dump/restore when a materialized view
      refers to tables owned by a different user.
     </para>
    </listitem>

    <listitem>
     <para>
      Improve <application>pg_dump</>/<application>pg_restore</>'s
      reporting of error conditions originating in <application>zlib</>
      (Vladimir Kunschikov, &Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_dump</> with the <option>--clean</> option to
      drop event triggers as expected (Tom Lane)
     </para>

     <para>
      It also now correctly assigns ownership of event triggers; before,
      they were restored as being owned by the superuser running the
      restore script.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_dump</> to not emit invalid SQL for an empty
      operator class (Daniel Gustafsson)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_dump</> output to stdout on Windows (Kuntal Ghosh)
     </para>

     <para>
      A compressed plain-text dump written to stdout would contain corrupt
      data due to failure to put the file descriptor into binary mode.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <function>pg_get_ruledef()</> to print correct output for
      the <literal>ON SELECT</> rule of a view whose columns have been
      renamed (Tom Lane)
     </para>

     <para>
      In some corner cases, <application>pg_dump</> relies
      on <function>pg_get_ruledef()</> to dump views, so that this error
      could result in dump/reload failures.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix dumping of outer joins with empty constraints, such as the result
      of a <literal>NATURAL LEFT JOIN</> with no common columns (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix dumping of function expressions in the <literal>FROM</> clause in
      cases where the expression does not deparse into something that looks
      like a function call (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_basebackup</> output to stdout on Windows
      (Haribabu Kommi)
     </para>

     <para>
      A backup written to stdout would contain corrupt data due to failure
      to put the file descriptor into binary mode.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_rewind</> to correctly handle files exceeding 2GB
      (Kuntal Ghosh, Michael Paquier)
     </para>

     <para>
      Ordinarily such files won't appear in <productname>PostgreSQL</> data
      directories, but they could be present in some cases.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_upgrade</> to ensure that the ending WAL record
      does not have <xref linkend="guc-wal-level"> = <literal>minimum</>
      (Bruce Momjian)
     </para>

     <para>
      This condition could prevent upgraded standby servers from
      reconnecting.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_xlogdump</>'s computation of WAL record length
      (Andres Freund)
     </para>
    </listitem>

    <listitem>
     <para>
      In <filename>postgres_fdw</>, re-establish connections to remote
      servers after <command>ALTER SERVER</> or <command>ALTER USER
      MAPPING</> commands (Kyotaro Horiguchi)
     </para>

     <para>
      This ensures that option changes affecting connection parameters will
      be applied promptly.
     </para>
    </listitem>

    <listitem>
     <para>
      In <filename>postgres_fdw</>, allow cancellation of remote
      transaction control commands (Robert Haas, Rafia Sabih)
     </para>

     <para>
      This change allows us to quickly escape a wait for an unresponsive
      remote server in many more cases than previously.
     </para>
    </listitem>

    <listitem>
     <para>
      Increase <literal>MAX_SYSCACHE_CALLBACKS</> to provide more room for
      extensions (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Always use <option>-fPIC</>, not <option>-fpic</>, when building
      shared libraries with gcc (Tom Lane)
     </para>

     <para>
      This supports larger extension libraries on platforms where it makes
      a difference.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_5_STABLE [af1f18259] 2017-08-02 15:07:20 -0400
Branch: REL9_4_STABLE [8892170e7] 2017-08-02 15:07:20 -0400
Branch: REL9_3_STABLE [3d9ae20e7] 2017-08-02 15:07:20 -0400
Branch: REL9_2_STABLE [1188b9b2c] 2017-08-02 15:07:21 -0400
-->
     <para>
      Fix unescaped-braces issue in our build scripts for Microsoft MSVC,
      to avoid a warning or error from recent Perl versions (Andrew
      Dunstan)
     </para>
    </listitem>

    <listitem>
     <para>
      In MSVC builds, handle the case where the <application>openssl</>
      library is not within a <filename>VC</> subdirectory (Andrew Dunstan)
     </para>
    </listitem>

    <listitem>
     <para>
      In MSVC builds, add proper include path for <application>libxml2</>
      header files (Andrew Dunstan)
     </para>

     <para>
      This fixes a former need to move things around in standard Windows
      installations of <application>libxml2</>.
     </para>
    </listitem>

    <listitem>
     <para>
      In MSVC builds, recognize a Tcl library that is
      named <filename>tcl86.lib</> (Noah Misch)
     </para>
    </listitem>

    <listitem>
     <para>
      In MSVC builds, honor <literal>PROVE_FLAGS</> settings
      on <filename>vcregress.pl</>'s command line (Andrew Dunstan)
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-7">
  <title>Release 9.5.7</title>

  <formalpara>
  <title>Release date:</title>
  <para>2017-05-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.6.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.7</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if you use foreign data servers that make use of user
    passwords for authentication, see the first changelog entry below.
   </para>

   <para>
    Also, if you are using third-party replication tools that depend
    on <quote>logical decoding</>, see the fourth changelog entry below.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 9.5.6,
    see <xref linkend="release-9-5-6">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
     <para>
      Restrict visibility
      of <structname>pg_user_mappings</>.<structfield>umoptions</>, to
      protect passwords stored as user mapping options
      (Michael Paquier, Feike Steenbergen)
     </para>

     <para>
      The previous coding allowed the owner of a foreign server object,
      or anyone he has granted server <literal>USAGE</> permission to,
      to see the options for all user mappings associated with that server.
      This might well include passwords for other users.
      Adjust the view definition to match the behavior of
      <structname>information_schema.user_mapping_options</>, namely that
      these options are visible to the user being mapped, or if the mapping
      is for <literal>PUBLIC</literal> and the current user is the server
      owner, or if the current user is a superuser.
      (CVE-2017-7486)
     </para>

     <para>
      By itself, this patch will only fix the behavior in newly initdb'd
      databases.  If you wish to apply this change in an existing database,
      follow the corrected procedure shown in the changelog entry for
      CVE-2017-7547, in <xref linkend="release-9-5-8">.
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent exposure of statistical information via leaky operators
      (Peter Eisentraut)
     </para>

     <para>
      Some selectivity estimation functions in the planner will apply
      user-defined operators to values obtained
      from <structname>pg_statistic</>, such as most common values and
      histogram entries.  This occurs before table permissions are checked,
      so a nefarious user could exploit the behavior to obtain these values
      for table columns he does not have permission to read.  To fix,
      fall back to a default estimate if the operator's implementation
      function is not certified leak-proof and the calling user does not have
      permission to read the table column whose statistics are needed.
      At least one of these criteria is satisfied in most cases in practice.
      (CVE-2017-7484)
     </para>
    </listitem>

    <listitem>
     <para>
      Restore <application>libpq</>'s recognition of
      the <envar>PGREQUIRESSL</> environment variable (Daniel Gustafsson)
     </para>

     <para>
      Processing of this environment variable was unintentionally dropped
      in <productname>PostgreSQL</> 9.3, but its documentation remained.
      This creates a security hazard, since users might be relying on the
      environment variable to force SSL-encrypted connections, but that
      would no longer be guaranteed.  Restore handling of the variable,
      but give it lower priority than <envar>PGSSLMODE</>, to avoid
      breaking configurations that work correctly with post-9.3 code.
      (CVE-2017-7485)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possibly-invalid initial snapshot during logical decoding
      (Petr Jelinek, Andres Freund)
     </para>

     <para>
      The initial snapshot created for a logical decoding replication slot
      was potentially incorrect.  This could cause third-party tools that
      use logical decoding to copy incomplete/inconsistent initial data.
      This was more likely to happen if the source server was busy at the
      time of slot creation, or if another logical slot already existed.
     </para>

     <para>
      If you are using a replication tool that depends on logical decoding,
      and it should have copied a nonempty data set at the start of
      replication, it is advisable to recreate the replica after
      installing this update, or to verify its contents against the source
      server.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possible corruption of <quote>init forks</> of unlogged indexes
      (Robert Haas, Michael Paquier)
     </para>

     <para>
      This could result in an unlogged index being set to an invalid state
      after a crash and restart.  Such a problem would persist until the
      index was dropped and rebuilt.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix incorrect reconstruction of <structname>pg_subtrans</> entries
      when a standby server replays a prepared but uncommitted two-phase
      transaction (Tom Lane)
     </para>

     <para>
      In most cases this turned out to have no visible ill effects, but in
      corner cases it could result in circular references
      in <structname>pg_subtrans</>, potentially causing infinite loops
      in queries that examine rows modified by the two-phase transaction.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid possible crash in <application>walsender</> due to failure
      to initialize a string buffer (Stas Kelvich, Fujii Masao)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possible crash when rescanning a nearest-neighbor index-only scan
      on a GiST index (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix postmaster's handling of <function>fork()</> failure for a
      background worker process (Tom Lane)
     </para>

     <para>
      Previously, the postmaster updated portions of its state as though
      the process had been launched successfully, resulting in subsequent
      confusion.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Branch: REL9_5_STABLE [7be3678a8] 2017-04-24 07:53:05 +0100
-->
     <para>
      Fix crash or wrong answers when a <literal>GROUPING SETS</> column's
      data type is hashable but not sortable (Pavan Deolasee)
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid applying <quote>physical targetlist</> optimization to custom
      scans (Dmitry Ivanov, Tom Lane)
     </para>

     <para>
      This optimization supposed that retrieving all columns of a tuple
      is inexpensive, which is true for ordinary Postgres tuples; but it
      might not be the case for a custom scan provider.
     </para>
    </listitem>

    <listitem>
     <para>
      Use the correct sub-expression when applying a <literal>FOR ALL</>
      row-level-security policy (Stephen Frost)
     </para>

     <para>
      In some cases the <literal>WITH CHECK</> restriction would be applied
      when the <literal>USING</> restriction is more appropriate.
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure parsing of queries in extension scripts sees the results of
      immediately-preceding DDL (Julien Rouhaud, Tom Lane)
     </para>

     <para>
      Due to lack of a cache flush step between commands in an extension
      script file, non-utility queries might not see the effects of an
      immediately preceding catalog change, such as <command>ALTER TABLE
      ... RENAME</>.
     </para>
    </listitem>

    <listitem>
     <para>
      Skip tablespace privilege checks when <command>ALTER TABLE ... ALTER
      COLUMN TYPE</> rebuilds an existing index (Noah Misch)
     </para>

     <para>
      The command failed if the calling user did not currently have
      <literal>CREATE</> privilege for the tablespace containing the index.
      That behavior seems unhelpful, so skip the check, allowing the
      index to be rebuilt where it is.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <command>ALTER TABLE ... VALIDATE CONSTRAINT</> to not recurse
      to child tables when the constraint is marked <literal>NO INHERIT</>
      (Amit Langote)
     </para>

     <para>
      This fix prevents unwanted <quote>constraint does not exist</> failures
      when no matching constraint is present in the child tables.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid dangling pointer in <command>COPY ... TO</> when row-level
      security is active for the source table (Tom Lane)
     </para>

     <para>
      Usually this had no ill effects, but sometimes it would cause
      unexpected errors or crashes.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid accessing an already-closed relcache entry in <command>CLUSTER</>
      and <command>VACUUM FULL</> (Tom Lane)
     </para>

     <para>
      With some bad luck, this could lead to indexes on the target
      relation getting rebuilt with the wrong persistence setting.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <command>VACUUM</> to account properly for pages that could not
      be scanned due to conflicting page pins (Andrew Gierth)
     </para>

     <para>
      This tended to lead to underestimation of the number of tuples in
      the table.  In the worst case of a small heavily-contended
      table, <command>VACUUM</> could incorrectly report that the table
      contained no tuples, leading to very bad planning choices.
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that bulk-tuple-transfer loops within a hash join are
      interruptible by query cancel requests (Tom Lane, Thomas Munro)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix integer-overflow problems in <type>interval</> comparison (Kyotaro
      Horiguchi, Tom Lane)
     </para>

     <para>
      The comparison operators for type <type>interval</> could yield wrong
      answers for intervals larger than about 296000 years.  Indexes on
      columns containing such large values should be reindexed, since they
      may be corrupt.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <function>cursor_to_xml()</> to produce valid output
      with <replaceable>tableforest</> = false
      (Thomas Munro, Peter Eisentraut)
     </para>

     <para>
      Previously it failed to produce a wrapping <literal>&lt;table&gt;</>
      element.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix roundoff problems in <function>float8_timestamptz()</>
      and <function>make_interval()</> (Tom Lane)
     </para>

     <para>
      These functions truncated, rather than rounded, when converting a
      floating-point value to integer microseconds; that could cause
      unexpectedly off-by-one results.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <function>pg_get_object_address()</> to handle members of operator
      families correctly (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
     <para>
      Improve performance of <structname>pg_timezone_names</> view
      (Tom Lane, David Rowley)
     </para>
    </listitem>

    <listitem>
     <para>
      Reduce memory management overhead for contexts containing many large
      blocks (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix sloppy handling of corner-case errors from <function>lseek()</>
      and <function>close()</> (Tom Lane)
     </para>

     <para>
      Neither of these system calls are likely to fail in typical situations,
      but if they did, <filename>fd.c</> could get quite confused.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix incorrect check for whether postmaster is running as a Windows
      service (Michael Paquier)
     </para>

     <para>
      This could result in attempting to write to the event log when that
      isn't accessible, so that no logging happens at all.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>ecpg</> to support <command>COMMIT PREPARED</>
      and <command>ROLLBACK PREPARED</> (Masahiko Sawada)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix a double-free error when processing dollar-quoted string literals
      in <application>ecpg</> (Michael Meskes)
     </para>
    </listitem>

    <listitem>
     <para>
      In <application>pg_dump</>, fix incorrect schema and owner marking for
      comments and security labels of some types of database objects
      (Giuseppe Broccolo, Tom Lane)
     </para>

     <para>
      In simple cases this caused no ill effects; but for example, a
      schema-selective restore might omit comments it should include, because
      they were not marked as belonging to the schema of their associated
      object.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid emitting an invalid list file in <literal>pg_restore -l</>
      when SQL object names contain newlines (Tom Lane)
     </para>

     <para>
      Replace newlines by spaces, which is sufficient to make the output
      valid for <literal>pg_restore -L</>'s purposes.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_upgrade</> to transfer comments and security labels
      attached to <quote>large objects</> (blobs) (Stephen Frost)
     </para>

     <para>
      Previously, blobs were correctly transferred to the new database, but
      any comments or security labels attached to them were lost.
     </para>
    </listitem>

    <listitem>
     <para>
      Improve error handling
      in <filename>contrib/adminpack</>'s <function>pg_file_write()</>
      function (Noah Misch)
     </para>

     <para>
      Notably, it failed to detect errors reported
      by <function>fclose()</>.
     </para>
    </listitem>

    <listitem>
     <para>
      In <filename>contrib/dblink</>, avoid leaking the previous unnamed
      connection when establishing a new unnamed connection (Joe Conway)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <filename>contrib/pg_trgm</>'s extraction of trigrams from regular
      expressions (Tom Lane)
     </para>

     <para>
      In some cases it would produce a broken data structure that could never
      match anything, leading to GIN or GiST indexscans that use a trigram
      index not finding any matches to the regular expression.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: REL9_5_STABLE [cdf5a004b] 2017-05-06 22:21:38 -0400
Branch: REL9_4_STABLE [f14bf0a8f] 2017-05-06 22:19:56 -0400
Branch: REL9_3_STABLE [3aa16b117] 2017-05-06 22:17:35 -0400
-->
     <para>
      In <filename>contrib/postgres_fdw</>,
      transmit query cancellation requests to the remote server
      (Michael Paquier, Etsuro Fujita)
     </para>

     <para>
      Previously, a local query cancellation request did not cause an
      already-sent remote query to terminate early.  This is a back-patch
      of work originally done for 9.6.
     </para>
    </listitem>

    <listitem>
     <para>
      Support Tcl 8.6 in MSVC builds (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
     <para>
      Sync our copy of the timezone library with IANA release tzcode2017b
      (Tom Lane)
     </para>

     <para>
      This fixes a bug affecting some DST transitions in January 2038.
     </para>
    </listitem>

    <listitem>
     <para>
      Update time zone data files to <application>tzdata</> release 2017b
      for DST law changes in Chile, Haiti, and Mongolia, plus historical
      corrections for Ecuador, Kazakhstan, Liberia, and Spain.
      Switch to numeric abbreviations for numerous time zones in South
      America, the Pacific and Indian oceans, and some Asian and Middle
      Eastern countries.
     </para>

     <para>
      The IANA time zone database previously provided textual abbreviations
      for all time zones, sometimes making up abbreviations that have little
      or no currency among the local population.  They are in process of
      reversing that policy in favor of using numeric UTC offsets in zones
      where there is no evidence of real-world use of an English
      abbreviation.  At least for the time being, <productname>PostgreSQL</>
      will continue to accept such removed abbreviations for timestamp input.
      But they will not be shown in the <structname>pg_timezone_names</>
      view nor used for output.
     </para>
    </listitem>

    <listitem>
     <para>
      Use correct daylight-savings rules for POSIX-style time zone names
      in MSVC builds (David Rowley)
     </para>

     <para>
      The Microsoft MSVC build scripts neglected to install
      the <filename>posixrules</> file in the timezone directory tree.
      This resulted in the timezone code falling back to its built-in
      rule about what DST behavior to assume for a POSIX-style time zone
      name.  For historical reasons that still corresponds to the DST rules
      the USA was using before 2007 (i.e., change on first Sunday in April
      and last Sunday in October).  With this fix, a POSIX-style zone name
      will use the current and historical DST transition dates of
      the <literal>US/Eastern</> zone.  If you don't want that, remove
      the <filename>posixrules</> file, or replace it with a copy of some
      other zone file (see <xref linkend="datatype-timezones">).  Note that
      due to caching, you may need to restart the server to get such changes
      to take effect.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-6">
  <title>Release 9.5.6</title>

  <formalpara>
  <title>Release date:</title>
  <para>2017-02-09</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.5.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.6</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if your installation has been affected by the bug described in
    the first changelog entry below, then after updating you may need
    to take action to repair corrupted indexes.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 9.5.5,
    see <xref linkend="release-9-5-5">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
     <para>
      Fix a race condition that could cause indexes built
      with <command>CREATE INDEX CONCURRENTLY</> to be corrupt
      (Pavan Deolasee, Tom Lane)
     </para>

     <para>
      If <command>CREATE INDEX CONCURRENTLY</> was used to build an index
      that depends on a column not previously indexed, then rows
      updated by transactions that ran concurrently with
      the <command>CREATE INDEX</> command could have received incorrect
      index entries.  If you suspect this may have happened, the most
      reliable solution is to rebuild affected indexes after installing
      this update.
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that the special snapshot used for catalog scans is not
      invalidated by premature data pruning (Tom Lane)
     </para>

     <para>
      Backends failed to account for this snapshot when advertising their
      oldest xmin, potentially allowing concurrent vacuuming operations to
      remove data that was still needed.  This led to transient failures
      along the lines of <quote>cache lookup failed for relation 1255</>.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix incorrect WAL logging for BRIN indexes (Kuntal Ghosh)
     </para>

     <para>
      The WAL record emitted for a BRIN <quote>revmap</> page when moving an
      index tuple to a different page was incorrect.  Replay would make the
      related portion of the index useless, forcing it to be recomputed.
     </para>
    </listitem>

    <listitem>
     <para>
      Unconditionally WAL-log creation of the <quote>init fork</> for an
      unlogged table (Michael Paquier)
     </para>

     <para>
      Previously, this was skipped when <xref linkend="guc-wal-level">
      = <literal>minimal</>, but actually it's necessary even in that case
      to ensure that the unlogged table is properly reset to empty after a
      crash.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL9_5_STABLE [c0db1ec26] 2016-11-17 13:31:30 -0300
Branch: REL9_4_STABLE [30e3cb307] 2016-11-17 13:31:30 -0300
-->
     <para>
      Reduce interlocking on standby servers during the replay of btree
      index vacuuming operations (Simon Riggs)
     </para>

     <para>
      This change avoids substantial replication delays that sometimes
      occurred while replaying such operations.
     </para>
    </listitem>

    <listitem>
     <para>
      If the stats collector dies during hot standby, restart it (Takayuki
      Tsunakawa)
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that hot standby feedback works correctly when it's enabled at
      standby server start (Ants Aasma, Craig Ringer)
     </para>
    </listitem>

    <listitem>
     <para>
      Check for interrupts while hot standby is waiting for a conflicting
      query (Simon Riggs)
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid constantly respawning the autovacuum launcher in a corner case
      (Amit Khandekar)
     </para>

     <para>
      This fix avoids problems when autovacuum is nominally off and there
      are some tables that require freezing, but all such tables are
      already being processed by autovacuum workers.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix check for when an extension member object can be dropped (Tom Lane)
     </para>

     <para>
      Extension upgrade scripts should be able to drop member objects,
      but this was disallowed for serial-column sequences, and possibly
      other cases.
     </para>
    </listitem>

    <listitem>
     <para>
      Make sure <command>ALTER TABLE</> preserves index tablespace
      assignments when rebuilding indexes (Tom Lane, Michael Paquier)
     </para>

     <para>
      Previously, non-default settings
      of <xref linkend="guc-default-tablespace"> could result in broken
      indexes.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix incorrect updating of trigger function properties when changing a
      foreign-key constraint's deferrability properties with <command>ALTER
      TABLE ... ALTER CONSTRAINT</> (Tom Lane)
     </para>

     <para>
      This led to odd failures during subsequent exercise of the foreign
      key, as the triggers were fired at the wrong times.
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent dropping a foreign-key constraint if there are pending
      trigger events for the referenced relation (Tom Lane)
     </para>

     <para>
      This avoids <quote>could not find trigger <replaceable>NNN</></quote>
      or <quote>relation <replaceable>NNN</> has no triggers</quote> errors.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <command>ALTER TABLE ... SET DATA TYPE ... USING</> when child
      table has different column ordering than the parent
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      Failure to adjust the column numbering in the <literal>USING</>
      expression led to errors,
      typically <quote>attribute <replaceable>N</> has wrong type</quote>.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix processing of OID column when a table with OIDs is associated to
      a parent with OIDs via <command>ALTER TABLE ... INHERIT</> (Amit
      Langote)
     </para>

     <para>
      The OID column should be treated the same as regular user columns in
      this case, but it wasn't, leading to odd behavior in later
      inheritance changes.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <command>CREATE OR REPLACE VIEW</> to update the view query
      before attempting to apply the new view options (Dean Rasheed)
     </para>

     <para>
      Previously the command would fail if the new options were
      inconsistent with the old view definition.
     </para>
    </listitem>

    <listitem>
     <para>
      Report correct object identity during <command>ALTER TEXT SEARCH
      CONFIGURATION</> (Artur Zakirov)
     </para>

     <para>
      The wrong catalog OID was reported to extensions such as logical
      decoding.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix commit timestamp mechanism to not fail when queried about
      the special XIDs <literal>FrozenTransactionId</>
      and <literal>BootstrapTransactionId</> (Craig Ringer)
     </para>
    </listitem>

    <listitem>
<!--
Author: Kevin Grittner <kgrittn@postgresql.org>
Branch: REL9_5_STABLE [bed2a0b06] 2016-12-13 19:14:42 -0600
Branch: REL9_4_STABLE [4b9d466c1] 2016-12-13 19:05:12 -0600
Branch: REL9_3_STABLE [5d80171ad] 2016-12-13 19:05:35 -0600
Branch: REL9_2_STABLE [60314e28e] 2016-12-13 19:08:09 -0600
-->
     <para>
      Check for serializability conflicts before reporting
      constraint-violation failures (Thomas Munro)
     </para>

     <para>
      When using serializable transaction isolation, it is desirable
      that any error due to concurrent transactions should manifest
      as a serialization failure, thereby cueing the application that
      a retry might succeed.  Unfortunately, this does not reliably
      happen for duplicate-key failures caused by concurrent insertions.
      This change ensures that such an error will be reported as a
      serialization error if the application explicitly checked for
      the presence of a conflicting key (and did not find it) earlier
      in the transaction.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix incorrect use of view reloptions as regular table reloptions (Tom
      Lane)
     </para>

     <para>
      The symptom was spurious <quote>ON CONFLICT is not supported on table
      ... used as a catalog table</> errors when the target
      of <command>INSERT ... ON CONFLICT</> is a view with cascade option.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix incorrect <quote>target lists can have at most <replaceable>N</>
      entries</quote> complaint when using <literal>ON CONFLICT</> with
      wide tables (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent multicolumn expansion of <replaceable>foo</><literal>.*</> in
      an <command>UPDATE</> source expression (Tom Lane)
     </para>

     <para>
      This led to <quote>UPDATE target count mismatch --- internal
      error</>.  Now the syntax is understood as a whole-row variable,
      as it would be in other contexts.
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that column typmods are determined accurately for
      multi-row <literal>VALUES</> constructs (Tom Lane)
     </para>

     <para>
      This fixes problems occurring when the first value in a column has a
      determinable typmod (e.g., length for a <type>varchar</> value) but
      later values don't share the same limit.
     </para>
    </listitem>

    <listitem>
     <para>
      Throw error for an unfinished Unicode surrogate pair at the end of a
      Unicode string (Tom Lane)
     </para>

     <para>
      Normally, a Unicode surrogate leading character must be followed by a
      Unicode surrogate trailing character, but the check for this was
      missed if the leading character was the last character in a Unicode
      string literal (<literal>U&amp;'...'</>) or Unicode identifier
      (<literal>U&amp;"..."</>).
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that a purely negative text search query, such
      as <literal>!foo</>, matches empty <type>tsvector</>s (Tom Dunstan)
     </para>

     <para>
      Such matches were found by GIN index searches, but not by sequential
      scans or GiST index searches.
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent crash when <function>ts_rewrite()</> replaces a non-top-level
      subtree with an empty query (Artur Zakirov)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix performance problems in <function>ts_rewrite()</> (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <function>ts_rewrite()</>'s handling of nested NOT operators
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Improve speed of user-defined aggregates that
      use <function>array_append()</> as transition function (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <function>array_fill()</> to handle empty arrays properly (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possible crash in <function>array_position()</>
      or <function>array_positions()</> when processing arrays of records
      (Junseok Yang)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix one-byte buffer overrun in <function>quote_literal_cstr()</>
      (Heikki Linnakangas)
     </para>

     <para>
      The overrun occurred only if the input consisted entirely of single
      quotes and/or backslashes.
     </para>
    </listitem>

    <listitem>
     <para>
      Prevent multiple calls of <function>pg_start_backup()</>
      and <function>pg_stop_backup()</> from running concurrently (Michael
      Paquier)
     </para>

     <para>
      This avoids an assertion failure, and possibly worse things, if
      someone tries to run these functions in parallel.
     </para>
    </listitem>

    <listitem>
     <para>
      Disable transform that attempted to remove no-op <literal>AT TIME
      ZONE</> conversions (Tom Lane)
     </para>

     <para>
      This resulted in wrong answers when the simplified expression was
      used in an index condition.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid discarding <type>interval</>-to-<type>interval</> casts
      that aren't really no-ops (Tom Lane)
     </para>

     <para>
      In some cases, a cast that should result in zeroing out
      low-order <type>interval</> fields was mistakenly deemed to be a
      no-op and discarded.  An example is that casting from <type>INTERVAL
      MONTH</> to <type>INTERVAL YEAR</> failed to clear the months field.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix bugs in transmitting GUC parameter values to parallel workers
      (Michael Paquier, Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that cached plans are invalidated by changes in foreign-table
      options (Amit Langote, Etsuro Fujita, Ashutosh Bapat)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_dump</> to dump user-defined casts and transforms
      that use built-in functions (Stephen Frost)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_restore</> with <option>--create --if-exists</>
      to behave more sanely if an archive contains
      unrecognized <command>DROP</> commands (Tom Lane)
     </para>

     <para>
      This doesn't fix any live bug, but it may improve the behavior in
      future if <application>pg_restore</> is used with an archive
      generated by a later <application>pg_dump</> version.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_basebackup</>'s rate limiting in the presence of
      slow I/O (Antonin Houska)
     </para>

     <para>
      If disk I/O was transiently much slower than the specified rate
      limit, the calculation overflowed, effectively disabling the rate
      limit for the rest of the run.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>pg_basebackup</>'s handling of
      symlinked <filename>pg_stat_tmp</> and <filename>pg_replslot</>
      subdirectories (Magnus Hagander, Michael Paquier)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possible <application>pg_basebackup</> failure on standby
      server when including WAL files (Amit Kapila, Robert Haas)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix possible mishandling of expanded arrays in domain check
      constraints and <literal>CASE</> execution (Tom Lane)
     </para>

     <para>
      It was possible for a PL/pgSQL function invoked in these contexts to
      modify or even delete an array value that needs to be preserved for
      additional operations.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix nested uses of PL/pgSQL functions in contexts such as domain
      check constraints evaluated during assignment to a PL/pgSQL variable
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Ensure that the Python exception objects we create for PL/Python are
      properly reference-counted (Rafa de la Torre, Tom Lane)
     </para>

     <para>
      This avoids failures if the objects are used after a Python garbage
      collection cycle has occurred.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix PL/Tcl to support triggers on tables that have <literal>.tupno</>
      as a column name (Tom Lane)
     </para>

     <para>
      This matches the (previously undocumented) behavior of
      PL/Tcl's <command>spi_exec</> and <command>spi_execp</> commands,
      namely that a magic <literal>.tupno</> column is inserted only if
      there isn't a real column named that.
     </para>
    </listitem>

    <listitem>
     <para>
      Allow DOS-style line endings in <filename>~/.pgpass</> files,
      even on Unix (Vik Fearing)
     </para>

     <para>
      This change simplifies use of the same password file across Unix and
      Windows machines.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix one-byte buffer overrun if <application>ecpg</> is given a file
      name that ends with a dot (Takayuki Tsunakawa)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <application>psql</>'s tab completion for <command>ALTER DEFAULT
      PRIVILEGES</> (Gilles Darold, Stephen Frost)
     </para>
    </listitem>

    <listitem>
     <para>
      In <application>psql</>, treat an empty or all-blank setting of
      the <envar>PAGER</> environment variable as meaning <quote>no
      pager</> (Tom Lane)
     </para>

     <para>
      Previously, such a setting caused output intended for the pager to
      vanish entirely.
     </para>
    </listitem>

    <listitem>
     <para>
      Improve <filename>contrib/dblink</>'s reporting of
      low-level <application>libpq</> errors, such as out-of-memory
      (Joe Conway)
     </para>
    </listitem>

    <listitem>
     <para>
      Teach <filename>contrib/dblink</> to ignore irrelevant server options
      when it uses a <filename>contrib/postgres_fdw</> foreign server as
      the source of connection options (Corey Huinker)
     </para>

     <para>
      Previously, if the foreign server object had options that were not
      also <application>libpq</> connection options, an error occurred.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix portability problems in <filename>contrib/pageinspect</>'s
      functions for GIN indexes (Peter Eisentraut, Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      On Windows, ensure that environment variable changes are propagated
      to DLLs built with debug options (Christian Ullrich)
     </para>
    </listitem>

    <listitem>
     <para>
      Sync our copy of the timezone library with IANA release tzcode2016j
      (Tom Lane)
     </para>

     <para>
      This fixes various issues, most notably that timezone data
      installation failed if the target directory didn't support hard
      links.
     </para>
    </listitem>

    <listitem>
     <para>
      Update time zone data files to <application>tzdata</> release 2016j
      for DST law changes in northern Cyprus (adding a new zone
      Asia/Famagusta), Russia (adding a new zone Europe/Saratov), Tonga,
      and Antarctica/Casey.
      Historical corrections for Italy, Kazakhstan, Malta, and Palestine.
      Switch to preferring numeric zone abbreviations for Tonga.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-5">
  <title>Release 9.5.5</title>

  <formalpara>
  <title>Release date:</title>
  <para>2016-10-27</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.4.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.5</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if your installation has been affected by the bug described in
    the first changelog entry below, then after updating you may need
    to take action to repair corrupted free space maps.
   </para>

   <para>
    Also, if you are upgrading from a version earlier than 9.5.2,
    see <xref linkend="release-9-5-2">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
     <para>
      Fix WAL-logging of truncation of relation free space maps and
      visibility maps (Pavan Deolasee, Heikki Linnakangas)
     </para>

     <para>
      It was possible for these files to not be correctly restored during
      crash recovery, or to be written incorrectly on a standby server.
      Bogus entries in a free space map could lead to attempts to access
      pages that have been truncated away from the relation itself, typically
      producing errors like <quote>could not read block <replaceable>XXX</>:
      read only 0 of 8192 bytes</quote>.  Checksum failures in the
      visibility map are also possible, if checksumming is enabled.
     </para>

     <para>
      Procedures for determining whether there is a problem and repairing it
      if so are discussed at
      <ulink url="https://wiki.postgresql.org/wiki/Free_Space_Map_Problems"></>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [60893786d] 2016-09-03 13:28:53 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [36646d3af] 2016-09-03 13:28:53 -0400
Branch: REL9_5_STABLE [08a72872f] 2016-09-03 13:28:53 -0400
Branch: REL9_4_STABLE [a69443564] 2016-09-03 13:28:53 -0400
-->
     <para>
      Fix incorrect creation of GIN index WAL records on big-endian machines
      (Tom Lane)
     </para>

     <para>
      The typical symptom was <quote>unexpected GIN leaf action</> errors
      during WAL replay.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [5c609a742] 2016-09-09 15:54:29 -0300
Branch: REL9_6_STABLE Release: REL9_6_0 [c3656c9ff] 2016-09-09 15:54:29 -0300
Branch: REL9_5_STABLE [f33765885] 2016-09-09 15:54:29 -0300
Branch: REL9_4_STABLE [8778da2af] 2016-09-09 15:54:29 -0300
Branch: REL9_3_STABLE [dfe7121df] 2016-09-09 15:54:29 -0300
-->
     <para>
      Fix <command>SELECT FOR UPDATE/SHARE</> to correctly lock tuples that
      have been updated by a subsequently-aborted transaction
      (&Aacute;lvaro Herrera)
     </para>

     <para>
      In 9.5 and later, the <command>SELECT</> would sometimes fail to
      return such tuples at all.  A failure has not been proven to occur in
      earlier releases, but might be possible with concurrent updates.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [96dd77d34] 2016-09-22 11:35:03 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [a88fe25f5] 2016-09-22 11:34:44 -0400
Branch: REL9_5_STABLE [c35917835] 2016-09-22 11:34:44 -0400
Branch: REL9_4_STABLE [d3dd00e67] 2016-09-22 11:34:44 -0400
Branch: REL9_3_STABLE [73df86a37] 2016-09-22 11:34:44 -0400
Branch: REL9_2_STABLE [8552f9b90] 2016-09-22 11:34:44 -0400
Branch: REL9_1_STABLE [0183df5dc] 2016-09-22 11:34:45 -0400
-->
     <para>
      Fix EvalPlanQual rechecks involving CTE scans (Tom Lane)
     </para>

     <para>
      The recheck would always see the CTE as returning no rows, typically
      leading to failure to update rows that were recently updated.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [07ef03512] 2016-08-17 17:03:36 -0700
Branch: REL9_6_STABLE Release: REL9_6_0 [e79aaebcc] 2016-08-17 17:03:36 -0700
Branch: REL9_5_STABLE [94bc30725] 2016-08-17 17:03:36 -0700
-->
     <para>
      Fix deletion of speculatively inserted TOAST tuples when backing out
      of <command>INSERT ... ON CONFLICT</> (Oskari Saarenmaa)
     </para>

     <para>
      In the race condition where two transactions try to insert conflicting
      tuples at about the same time, the loser would fail with
      an <quote>attempted to delete invisible tuple</> error if its
      insertion included any TOAST'ed fields.
     </para>
    </listitem>

    <listitem>
     <para>
      Don't throw serialization errors for self-conflicting insertions
      in <command>INSERT ... ON CONFLICT</> (Thomas Munro, Peter Geoghegan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2c00fad28] 2016-08-24 14:38:12 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [616be05df] 2016-08-24 14:38:13 -0400
Branch: REL9_5_STABLE [25fe5f758] 2016-08-24 14:37:50 -0400
Branch: REL9_4_STABLE [08a823e53] 2016-08-24 14:37:51 -0400
Branch: REL9_3_STABLE [aaad96e40] 2016-08-24 14:37:51 -0400
Branch: REL9_2_STABLE [237663897] 2016-08-24 14:37:51 -0400
Branch: REL9_1_STABLE [3570ea424] 2016-08-24 14:37:51 -0400
-->
     <para>
      Fix improper repetition of previous results from hashed aggregation in
      a subquery (Andrew Gierth)
     </para>

     <para>
      The test to see if we can reuse a previously-computed hash table of
      the aggregate state values neglected the possibility of an outer query
      reference appearing in an aggregate argument expression.  A change in
      the value of such a reference should lead to recalculating the hash
      table, but did not.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ae4760d66] 2016-08-24 22:20:25 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [006fb80a5] 2016-08-24 22:20:26 -0400
Branch: REL9_5_STABLE [46bd14a10] 2016-08-24 22:20:01 -0400
Branch: REL9_4_STABLE [566afa15c] 2016-08-24 22:20:01 -0400
-->
     <para>
      Fix query-lifespan memory leak in a bulk <command>UPDATE</> on a table
      with a <literal>PRIMARY KEY</> or <literal>REPLICA IDENTITY</> index
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <command>COPY</> with a column name list from a table that has
      row-level security enabled (Adam Brightwell)
     </para>
    </listitem>

    <listitem>
     <para>
      Fix <command>EXPLAIN</> to emit valid XML when
      <xref linkend="guc-track-io-timing"> is on (Markus Winand)
     </para>

     <para>
      Previously the XML output-format option produced syntactically invalid
      tags such as <literal>&lt;I/O-Read-Time&gt;</>.  That is now
      rendered as <literal>&lt;I-O-Read-Time&gt;</>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL9_6_BR [4b234fd8b] 2016-08-12 12:13:04 -0400
Branch: REL9_5_STABLE [ed2d7b8c8] 2016-08-12 12:13:04 -0400
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-->
     <para>
      Suppress printing of zeroes for unmeasured times
      in <command>EXPLAIN</> (Maksim Milyutin)
     </para>

     <para>
      Certain option combinations resulted in printing zero values for times
      that actually aren't ever measured in that combination.  Our general
      policy in <command>EXPLAIN</> is not to print such fields at all, so
      do that consistently in all cases.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix statistics update for <command>TRUNCATE</> in a prepared
      transaction (Stas Kelvich)
     </para>
    </listitem>

    <listitem>
<!--
Author: Simon Riggs <simon@2ndQuadrant.com>
Branch: master [dcb12ce8d] 2016-09-06 15:35:47 +0100
Branch: REL9_6_STABLE Release: REL9_6_0 [1fa42debe] 2016-09-09 11:43:08 +0100
Branch: REL9_5_STABLE [f3b3e871e] 2016-09-09 11:43:46 +0100
Branch: REL9_4_STABLE [81b0f8204] 2016-09-09 11:44:54 +0100
Branch: REL9_3_STABLE [e1dddf3e8] 2016-09-09 11:45:16 +0100
Branch: REL9_2_STABLE [eaf6fe7fa] 2016-09-09 11:45:40 +0100
Branch: REL9_1_STABLE [3ed7f54bc] 2016-09-09 11:46:03 +0100
-->
     <para>
      Fix timeout length when <command>VACUUM</> is waiting for exclusive
      table lock so that it can truncate the table (Simon Riggs)
     </para>

     <para>
      The timeout was meant to be 50 milliseconds, but it was actually only
      50 microseconds, causing <command>VACUUM</> to give up on truncation
      much more easily than intended.  Set it to the intended value.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix bugs in merging inherited <literal>CHECK</> constraints while
      creating or altering a table (Tom Lane, Amit Langote)
     </para>

     <para>
      Allow identical <literal>CHECK</> constraints to be added to a parent
      and child table in either order.  Prevent merging of a valid
      constraint from the parent table with a <literal>NOT VALID</>
      constraint on the child.  Likewise, prevent merging of a <literal>NO
      INHERIT</> child constraint with an inherited constraint.
     </para>
    </listitem>

    <listitem>
     <para>
      Show a sensible value
      in <structname>pg_settings</>.<structfield>unit</>
      for <varname>min_wal_size</> and <varname>max_wal_size</> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL9_6_BR [9389fbd03] 2016-08-14 15:06:01 -0400
Branch: REL9_5_STABLE [635651214] 2016-08-14 15:06:01 -0400
Branch: REL9_4_STABLE [4ac3d7794] 2016-08-14 15:06:01 -0400
Branch: REL9_3_STABLE [e8e20aadd] 2016-08-14 15:06:02 -0400
Branch: REL9_2_STABLE [9d5bf77b5] 2016-08-14 15:06:02 -0400
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-->
     <para>
      Remove artificial restrictions on the values accepted
      by <function>numeric_in()</> and <function>numeric_recv()</>
      (Tom Lane)
     </para>

     <para>
      We allow numeric values up to the limit of the storage format (more
      than <literal>1e100000</>), so it seems fairly pointless
      that <function>numeric_in()</> rejected scientific-notation exponents
      above 1000.  Likewise, it was silly for <function>numeric_recv()</> to
      reject more than 1000 digits in an input value.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid very-low-probability data corruption due to testing tuple
      visibility without holding buffer lock (Thomas Munro, Peter Geoghegan,
      Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Preserve commit timestamps across server restart
      (Julien Rouhaud, Craig Ringer)
     </para>

     <para>
      With <xref linkend="guc-track-commit-timestamp"> turned on, old
      commit timestamps became inaccessible after a clean server restart.
     </para>
    </listitem>

    <listitem>
     <para>
      Fix logical WAL decoding to work properly when a subtransaction's WAL
      output is large enough to spill to disk (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [008c4135c] 2016-08-22 15:22:11 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [48b9ca0b6] 2016-08-22 15:30:31 -0400
Branch: REL9_5_STABLE [da9659f87] 2016-08-22 15:30:37 -0400
-->
     <para>
      Fix possible sorting error when aborting use of abbreviated keys
      (Peter Geoghegan)
     </para>

     <para>
      In the worst case, this could result in a corrupt btree index, which
      would need to be rebuilt using <command>REINDEX</>.  However, the
      situation is believed to be rare.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [769fd9d8e] 2016-09-08 16:51:09 -0700
Branch: REL9_6_STABLE Release: REL9_6_0 [f6802936a] 2016-09-08 16:52:13 -0700
Branch: REL9_5_STABLE [26ce63ce7] 2016-09-08 16:52:13 -0700
Branch: REL9_4_STABLE [075cfbe4a] 2016-09-08 16:52:13 -0700
Branch: REL9_3_STABLE [d2a5b2b28] 2016-09-08 16:52:13 -0700
Branch: REL9_2_STABLE [f5462dedb] 2016-09-08 16:52:13 -0700
Branch: REL9_1_STABLE [08fdfe7a8] 2016-09-08 16:52:13 -0700
-->
     <para>
      Fix file descriptor leakage when truncating a temporary relation of
      more than 1GB (Andres Freund)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0e0f43d6f] 2016-08-31 08:52:13 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [3fc489cb3] 2016-08-31 08:52:13 -0400
Branch: REL9_5_STABLE [c40bb1155] 2016-08-31 08:52:13 -0400
Branch: REL9_4_STABLE [f4e40537e] 2016-08-31 08:52:13 -0400
Branch: REL9_3_STABLE [baf111d31] 2016-08-31 08:52:13 -0400
Branch: REL9_2_STABLE [823df401d] 2016-08-31 08:52:13 -0400
Branch: REL9_1_STABLE [e3439a455] 2016-08-31 08:52:13 -0400
-->
     <para>
      Disallow starting a standalone backend with <literal>standby_mode</>
      turned on (Michael Paquier)
     </para>

     <para>
      This can't do anything useful, since there will be no WAL receiver
      process to fetch more WAL data; and it could result in misbehavior
      in code that wasn't designed with this situation in mind.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [2d7e59100] 2016-08-17 13:15:03 -0700
Branch: REL9_6_STABLE Release: REL9_6_0 [8cb23dba8] 2016-08-17 13:15:03 -0700
Branch: REL9_5_STABLE [de396a1cb] 2016-08-17 13:15:03 -0700
Branch: REL9_4_STABLE [690a2fb90] 2016-08-17 13:15:04 -0700
-->
     <para>
      Properly initialize replication slot state when recycling a
      previously-used slot (Michael Paquier)
     </para>

     <para>
      This failure to reset all of the fields of the slot could
      prevent <command>VACUUM</> from removing dead tuples.
     </para>
    </listitem>

    <listitem>
     <para>
      Round shared-memory allocation request to a multiple of the actual
      huge page size when attempting to use huge pages on Linux (Tom Lane)
     </para>

     <para>
      This avoids possible failures during <function>munmap()</> on systems
      with atypical default huge page sizes.  Except in crash-recovery
      cases, there were no ill effects other than a log message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [470d886c3] 2016-09-20 12:26:29 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [92668cd4d] 2016-09-20 12:28:02 -0400
Branch: REL9_5_STABLE [b1aed95f5] 2016-09-20 12:30:38 -0400
Branch: REL9_4_STABLE [626312d1b] 2016-09-20 12:30:42 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [49a91b88e] 2016-09-23 09:54:11 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [b251379fb] 2016-09-23 09:54:11 -0400
Branch: REL9_5_STABLE [93528f7b4] 2016-09-23 09:54:11 -0400
Branch: REL9_4_STABLE [32cdf680f] 2016-09-23 09:54:11 -0400
-->
     <para>
      Use a more random value for the dynamic shared memory control
      segment's ID (Robert Haas, Tom Lane)
     </para>

     <para>
      Previously, the same value would be chosen every time, because it was
      derived from <function>random()</> but <function>srandom()</> had not
      yet been called.  While relatively harmless, this was not the intended
      behavior.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [419113dfd] 2016-09-20 12:04:41 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [6bcd26c43] 2016-09-20 12:12:27 -0400
Branch: REL9_5_STABLE [c124e3649] 2016-09-20 12:12:31 -0400
Branch: REL9_4_STABLE [c23b2523d] 2016-09-20 12:12:36 -0400
-->
     <para>
      On Windows, retry creation of the dynamic shared memory control
      segment after an access-denied error (Kyotaro Horiguchi, Amit Kapila)
     </para>

     <para>
      Windows sometimes returns <literal>ERROR_ACCESS_DENIED</> rather
      than <literal>ERROR_ALREADY_EXISTS</> when there is an existing
      segment.  This led to postmaster startup failure due to believing that
      the former was an unrecoverable error.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5697522d8] 2016-08-18 14:49:08 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [c81c71d88] 2016-08-18 14:48:51 -0400
Branch: REL9_5_STABLE [a8fc19505] 2016-08-18 14:48:51 -0400
-->
     <para>
      Fix <application>PL/pgSQL</> to not misbehave with parameters and
      local variables of type <type>int2vector</> or <type>oidvector</>
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
     <para>
      Don't try to share SSL contexts across multiple connections
      in <application>libpq</> (Heikki Linnakangas)
     </para>

     <para>
      This led to assorted corner-case bugs, particularly when trying to use
      different SSL parameters for different connections.
     </para>
    </listitem>

    <listitem>
     <para>
      Avoid corner-case memory leak in <application>libpq</> (Tom Lane)
     </para>

     <para>
      The reported problem involved leaking an error report
      during <function>PQreset()</>, but there might be related cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [3fcc98c99] 2016-09-18 13:46:32 +0300
Branch: REL9_6_STABLE Release: REL9_6_0 [e06728d63] 2016-09-18 13:56:11 +0300
Branch: REL9_5_STABLE [7c177ddc2] 2016-09-18 13:56:52 +0300
Branch: REL9_4_STABLE [d48e10a68] 2016-09-18 13:59:57 +0300
Branch: REL9_3_STABLE [b31f335bf] 2016-09-18 14:00:10 +0300
Branch: REL9_2_STABLE [a4a3fac16] 2016-09-18 14:00:13 +0300
Branch: REL9_1_STABLE [ed29d2de2] 2016-09-18 14:07:30 +0300
-->
     <para>
      Make <application>ecpg</>'s <option>--help</> and <option>--version</>
      options work consistently with our other executables (Haribabu Kommi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [40c3fe498] 2016-09-19 22:55:43 +0300
Branch: REL9_6_STABLE Release: REL9_6_0 [f65764a04] 2016-09-19 22:55:50 +0300
Branch: REL9_5_STABLE [edb5c4097] 2016-09-19 22:58:03 +0300
Branch: REL9_4_STABLE [476945c45] 2016-09-19 22:59:44 +0300
Branch: master [65c655638] 2016-09-21 13:14:48 +0300
Branch: REL9_6_STABLE Release: REL9_6_0 [93834a20f] 2016-09-21 13:16:02 +0300
Branch: REL9_5_STABLE [b93d37474] 2016-09-21 13:16:20 +0300
Branch: REL9_4_STABLE [f16d4a241] 2016-09-21 13:16:24 +0300
-->
     <para>
      Fix <application>pgbench</>'s calculation of average latency
      (Fabien Coelho)
     </para>

     <para>
      The calculation was incorrect when there were <literal>\sleep</>
      commands in the script, or when the test duration was specified in
      number of transactions rather than total time.
     </para>
    </listitem>

    <listitem>
     <para>
      In <application>pg_upgrade</>, check library loadability in name order
      (Tom Lane)
     </para>

     <para>
      This is a workaround to deal with cross-extension dependencies from
      language transform modules to their base language and data type
      modules.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [12f6eadff] 2016-09-23 13:49:26 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [7e02476f3] 2016-09-23 13:49:26 -0400
Branch: REL9_5_STABLE [96e16d739] 2016-09-23 13:49:26 -0400
Branch: REL9_4_STABLE [912ea1945] 2016-09-23 13:49:27 -0400
Branch: REL9_3_STABLE [f39bb487d] 2016-09-23 13:49:27 -0400
Branch: REL9_2_STABLE [53b29d986] 2016-09-23 13:49:27 -0400
-->
     <para>
      In <application>pg_dump</>, never dump range constructor functions
      (Tom Lane)
     </para>

     <para>
      This oversight led to <application>pg_upgrade</> failures with
      extensions containing range types, due to duplicate creation of the
      constructor functions.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e97e9c57b] 2016-09-08 10:48:03 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [a88cee90f] 2016-09-08 10:48:03 -0400
Branch: REL9_5_STABLE [142a110b3] 2016-09-08 10:48:03 -0400
-->
     <para>
      In <application>pg_dump</> with <option>-C</>,
      suppress <literal>TABLESPACE</> clause of <command>CREATE DATABASE</>
      if <option>--no-tablespaces</> is specified (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Simon Riggs <simon@2ndQuadrant.com>
Branch: master [49340627f] 2016-08-29 12:16:18 +0100
Branch: REL9_6_STABLE Release: REL9_6_0 [216fd7fe7] 2016-08-29 12:18:12 +0100
Branch: REL9_5_STABLE [9050e5c89] 2016-08-29 12:18:57 +0100
Branch: REL9_5_STABLE [3aa233f82] 2016-08-29 18:12:04 -0300
-->
     <para>
      Make <application>pg_receivexlog</> work correctly
      with <option>--synchronous</> without slots (Gabriele Bartolini)
     </para>
    </listitem>

    <listitem>
     <para>
      Disallow specifying both <option>--source-server</>
      and <option>--source-target</> options to <application>pg_rewind</>
      (Michael Banck)
     </para>
    </listitem>

    <listitem>
     <para>
      Make <application>pg_rewind</> turn off <varname>synchronous_commit</>
      in its session on the source server (Michael Banck, Michael Paquier)
     </para>

     <para>
      This allows <application>pg_rewind</> to work even when the source
      server is using synchronous replication that is not working for some
      reason.
     </para>
    </listitem>

    <listitem>
     <para>
      In <application>pg_xlogdump</>, retry opening new WAL segments when
      using <option>--follow</> option (Magnus Hagander)
     </para>

     <para>
      This allows for a possible delay in the server's creation of the next
      segment.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [bab7823a4] 2016-08-29 14:34:58 +0900
Branch: REL9_6_STABLE Release: REL9_6_0 [2802b02a5] 2016-08-29 14:35:40 +0900
Branch: REL9_5_STABLE [7dfb9b479] 2016-08-29 14:35:51 +0900
Branch: REL9_4_STABLE [314a25fb3] 2016-08-29 14:38:17 +0900
Branch: REL9_3_STABLE [5833306dd] 2016-08-29 15:51:30 +0900
-->
     <para>
      Fix <application>pg_xlogdump</> to cope with a WAL file that begins
      with a continuation record spanning more than one page (Pavan
      Deolasee)
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [8a503526e] 2016-09-15 09:30:38 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [bea38f34a] 2016-09-15 09:30:37 -0400
Branch: REL9_5_STABLE [60b6d99da] 2016-09-15 09:30:36 -0400
Branch: REL9_4_STABLE [1336bd986] 2016-09-15 09:22:52 -0400
-->
     <para>
      Fix <filename>contrib/pg_buffercache</> to work
      when <varname>shared_buffers</> exceeds 256GB (KaiGai Kohei)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6657acc01] 2016-08-17 15:51:10 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [d715b76d1] 2016-08-17 15:51:10 -0400
Branch: REL9_5_STABLE [509815ed7] 2016-08-17 15:51:10 -0400
Branch: REL9_4_STABLE [3fa8ec44d] 2016-08-17 15:51:10 -0400
Branch: REL9_3_STABLE [7baa8bfca] 2016-08-17 15:51:10 -0400
Branch: REL9_2_STABLE [60bb1bb12] 2016-08-17 15:51:11 -0400
Branch: REL9_1_STABLE [9942376a5] 2016-08-17 15:51:11 -0400
-->
     <para>
      Fix <filename>contrib/intarray/bench/bench.pl</> to print the results
      of the <command>EXPLAIN</> it does when given the <option>-e</> option
      (Daniel Gustafsson)
     </para>
    </listitem>

    <listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [593d4e47d] 2016-09-15 14:42:29 +0300
Branch: REL9_6_STABLE Release: REL9_6_0 [fcd93e4af] 2016-09-15 12:55:38 +0300
Branch: REL9_5_STABLE [e2838c580] 2016-09-15 14:51:42 +0300
Branch: master [5c6df67e0] 2016-09-15 22:52:51 +0300
Branch: REL9_6_STABLE Release: REL9_6_0 [9895818d5] 2016-09-15 22:45:08 +0300
Branch: REL9_5_STABLE [48e5ba61e] 2016-09-15 22:38:01 +0300
-->
     <para>
      Support OpenSSL 1.1.0 (Heikki Linnakangas)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c3a081846] 2016-09-23 15:50:00 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [5a83e2d4e] 2016-09-23 15:50:00 -0400
Branch: REL9_5_STABLE [025c9a722] 2016-09-23 15:50:00 -0400
Branch: REL9_4_STABLE [5d41f27a9] 2016-09-23 15:50:00 -0400
-->
     <para>
      Install TAP test infrastructure so that it's available for extension
      testing (Craig Ringer)
     </para>

     <para>
      When <productname>PostgreSQL</> has been configured
      with <option>--enable-tap-tests</>, <quote>make install</> will now
      install the Perl support files for TAP testing where PGXS can find
      them.  This allows non-core extensions to
      use <literal>$(prove_check)</> without extra tests.
     </para>
    </listitem>

    <listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [8614b39bc] 2016-09-19 14:25:57 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [156f974f5] 2016-09-19 14:27:04 -0400
Branch: REL9_5_STABLE [52acf020a] 2016-09-19 14:27:08 -0400
Branch: REL9_4_STABLE [ca93b816f] 2016-09-19 14:27:13 -0400
-->
     <para>
      In MSVC builds, include <application>pg_recvlogical</> in a
      client-only installation (MauMau)
     </para>
    </listitem>

    <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [a79a68562] 2016-08-18 12:32:42 +0200
Branch: REL9_6_STABLE Release: REL9_6_0 [191d45793] 2016-08-18 12:37:55 +0200
Branch: REL9_5_STABLE [a0833b972] 2016-08-18 15:35:12 +0200
Branch: REL9_4_STABLE [1d990cd8c] 2016-08-18 15:35:26 +0200
Branch: REL9_3_STABLE [e8aed974b] 2016-08-18 15:35:36 +0200
Branch: REL9_2_STABLE [35982db49] 2016-08-18 15:35:43 +0200
-->
     <para>
      Update Windows time zone mapping to recognize some time zone names
      added in recent Windows versions (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [39b691f25] 2016-09-02 17:30:02 -0400
Branch: REL9_6_STABLE Release: REL9_6_0 [32c9950b3] 2016-09-02 17:29:31 -0400
Branch: REL9_5_STABLE [73a802a41] 2016-09-02 17:29:31 -0400
Branch: REL9_4_STABLE [7430ac852] 2016-09-02 17:29:32 -0400
Branch: REL9_3_STABLE [ee78d4885] 2016-09-02 17:29:32 -0400
Branch: REL9_2_STABLE [1195b8efe] 2016-09-02 17:29:32 -0400
Branch: REL9_1_STABLE [380dad29d] 2016-09-02 17:29:32 -0400
-->
     <para>
      Prevent failure of obsolete dynamic time zone abbreviations (Tom Lane)
     </para>

     <para>
      If a dynamic time zone abbreviation does not match any entry in the
      referenced time zone, treat it as equivalent to the time zone name.
      This avoids unexpected failures when IANA removes abbreviations from
      their time zone database, as they did in <application>tzdata</>
      release 2016f and seem likely to do again in the future.  The
      consequences were not limited to not recognizing the individual
      abbreviation; any mismatch caused
      the <structname>pg_timezone_abbrevs</> view to fail altogether.
     </para>
    </listitem>

    <listitem>
     <para>
      Update time zone data files to <application>tzdata</> release 2016h
      for DST law changes in Palestine and Turkey, plus historical
      corrections for Turkey and some regions of Russia.
      Switch to numeric abbreviations for some time zones in Antarctica,
      the former Soviet Union, and Sri Lanka.
     </para>

     <para>
      The IANA time zone database previously provided textual abbreviations
      for all time zones, sometimes making up abbreviations that have little
      or no currency among the local population.  They are in process of
      reversing that policy in favor of using numeric UTC offsets in zones
      where there is no evidence of real-world use of an English
      abbreviation.  At least for the time being, <productname>PostgreSQL</>
      will continue to accept such removed abbreviations for timestamp input.
      But they will not be shown in the <structname>pg_timezone_names</>
      view nor used for output.
     </para>

     <para>
      In this update, <literal>AMT</> is no longer shown as being in use to
      mean Armenia Time.  Therefore, we have changed the <literal>Default</>
      abbreviation set to interpret it as Amazon Time, thus UTC-4 not UTC+4.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-4">
  <title>Release 9.5.4</title>

  <formalpara>
  <title>Release date:</title>
  <para>2016-08-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.3.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.4</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 9.5.2,
    see <xref linkend="release-9-5-2">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f0c7b789a] 2016-08-08 10:33:46 -0400
Branch: REL9_5_STABLE [98b0c6280] 2016-08-08 10:33:46 -0400
Branch: REL9_4_STABLE [f40618092] 2016-08-08 10:33:47 -0400
Branch: REL9_3_STABLE [6c954a6a5] 2016-08-08 10:33:47 -0400
Branch: REL9_2_STABLE [8b32516db] 2016-08-08 10:33:47 -0400
Branch: REL9_1_STABLE [5327b764a] 2016-08-08 10:33:47 -0400
-->
     <para>
      Fix possible mis-evaluation of
      nested <literal>CASE</>-<literal>WHEN</> expressions (Heikki
      Linnakangas, Michael Paquier, Tom Lane)
     </para>

     <para>
      A <literal>CASE</> expression appearing within the test value
      subexpression of another <literal>CASE</> could become confused about
      whether its own test value was null or not.  Also, inlining of a SQL
      function implementing the equality operator used by
      a <literal>CASE</> expression could result in passing the wrong test
      value to functions called within a <literal>CASE</> expression in the
      SQL function's body.  If the test values were of different data
      types, a crash might result; moreover such situations could be abused
      to allow disclosure of portions of server memory.  (CVE-2016-5423)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [fcd15f135] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [286c8bc64] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [254eb04f1] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [95a6855c5] 2016-08-08 10:07:52 -0400
Branch: REL9_2_STABLE [e8f4922c8] 2016-08-08 10:07:53 -0400
Branch: REL9_1_STABLE [a2385cac1] 2016-08-08 10:07:54 -0400
Branch: master [41f18f021] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [8adff3783] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [6df8ff49d] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [c1b048f49] 2016-08-08 10:07:52 -0400
Branch: REL9_2_STABLE [f1d0b09cf] 2016-08-08 10:07:53 -0400
Branch: REL9_1_STABLE [d2dd5df51] 2016-08-08 10:07:54 -0400
Branch: REL9_2_STABLE [a19edcd24] 2016-08-08 10:07:53 -0400
Branch: REL9_1_STABLE [c761c9fee] 2016-08-08 10:07:54 -0400
Branch: master [bd6537185] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [2e5e90d8d] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [18392ed4a] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [395d565ac] 2016-08-08 10:07:52 -0400
Branch: REL9_2_STABLE [483715529] 2016-08-08 10:07:53 -0400
Branch: REL9_1_STABLE [2d69f5b12] 2016-08-08 10:07:54 -0400
Branch: master [142c24c23] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [ec3aebdbd] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [6bec1a6c8] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [0f679d2c1] 2016-08-08 10:07:52 -0400
Branch: REL9_2_STABLE [ffbdab65d] 2016-08-08 10:07:53 -0400
Branch: REL9_1_STABLE [61c2cd88d] 2016-08-08 10:07:53 -0400
Branch: master [c40071717] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [640768ceb] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [aed038795] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [05abd3bcf] 2016-08-08 10:07:52 -0400
Branch: REL9_2_STABLE [a466ea33c] 2016-08-08 10:07:52 -0400
Branch: REL9_1_STABLE [ba8c4089d] 2016-08-08 10:07:53 -0400
Branch: master [9d924e9a6] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [6655c0757] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [afabfcc0e] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [dfb2d8039] 2016-08-08 10:07:51 -0400
Branch: REL9_2_STABLE [f744e8906] 2016-08-08 10:07:52 -0400
Branch: REL9_1_STABLE [cf7e5f55b] 2016-08-08 10:07:53 -0400
Branch: master [984e5beb3] 2016-08-08 10:07:46 -0400
Branch: REL9_5_STABLE [db951dd19] 2016-08-08 10:07:50 -0400
Branch: REL9_4_STABLE [fed83cdac] 2016-08-08 10:07:51 -0400
Branch: REL9_3_STABLE [a44d71351] 2016-08-08 10:07:51 -0400
Branch: REL9_2_STABLE [0cc3b12d2] 2016-08-08 10:07:52 -0400
Branch: REL9_1_STABLE [aed766ab5] 2016-08-08 10:07:53 -0400
-->
     <para>
      Fix client programs' handling of special characters in database and
      role names (Noah Misch, Nathan Bossart, Michael Paquier)
     </para>

     <para>
      Numerous places in <application>vacuumdb</> and other client programs
      could become confused by database and role names containing double
      quotes or backslashes.  Tighten up quoting rules to make that safe.
      Also, ensure that when a conninfo string is used as a database name
      parameter to these programs, it is correctly treated as such throughout.
     </para>

     <para>
      Fix handling of paired double quotes
      in <application>psql</>'s <command>\connect</>
      and <command>\password</> commands to match the documentation.
     </para>

     <para>
      Introduce a new <option>-reuse-previous</> option
      in <application>psql</>'s <command>\connect</> command to allow
      explicit control of whether to re-use connection parameters from a
      previous connection.  (Without this, the choice is based on whether
      the database name looks like a conninfo string, as before.)  This
      allows secure handling of database names containing special
      characters in <application>pg_dumpall</> scripts.
     </para>

     <para>
      <application>pg_dumpall</> now refuses to deal with database and role
      names containing carriage returns or newlines, as it seems impractical
      to quote those characters safely on Windows.  In future we may reject
      such names on the server side, but that step has not been taken yet.
     </para>

     <para>
      These are considered security fixes because crafted object names
      containing special characters could have been used to execute
      commands with superuser privileges the next time a superuser
      executes <application>pg_dumpall</> or other routine maintenance
      operations.  (CVE-2016-5424)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4452000f3] 2016-07-26 15:25:02 -0400
Branch: REL9_5_STABLE [d2ef7758d] 2016-07-26 15:25:02 -0400
Branch: REL9_4_STABLE [0733188cc] 2016-07-26 15:25:02 -0400
Branch: REL9_3_STABLE [c235d510e] 2016-07-26 15:25:02 -0400
Branch: REL9_2_STABLE [bcdd8a194] 2016-07-26 15:25:02 -0400
Branch: REL9_1_STABLE [d243bf77c] 2016-07-26 15:25:02 -0400
Branch: master [9492cf86e] 2016-07-28 16:09:15 -0400
Branch: REL9_5_STABLE [1e2f96f0a] 2016-07-28 16:09:15 -0400
Branch: REL9_4_STABLE [66f7e4081] 2016-07-28 16:09:15 -0400
Branch: REL9_3_STABLE [069714387] 2016-07-28 16:09:15 -0400
Branch: REL9_2_STABLE [7b8526e5d] 2016-07-28 16:09:15 -0400
Branch: REL9_1_STABLE [c0e5096fc] 2016-07-28 16:09:15 -0400
-->
     <para>
      Fix corner-case misbehaviors for <literal>IS NULL</>/<literal>IS NOT
      NULL</> applied to nested composite values (Andrew Gierth, Tom Lane)
     </para>

     <para>
      The SQL standard specifies that <literal>IS NULL</> should return
      TRUE for a row of all null values (thus <literal>ROW(NULL,NULL) IS
      NULL</> yields TRUE), but this is not meant to apply recursively
      (thus <literal>ROW(NULL, ROW(NULL,NULL)) IS NULL</> yields FALSE).
      The core executor got this right, but certain planner optimizations
      treated the test as recursive (thus producing TRUE in both cases),
      and <filename>contrib/postgres_fdw</> could produce remote queries
      that misbehaved similarly.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [eae1ad9b6] 2016-05-23 19:23:36 -0400
Branch: REL9_5_STABLE [e504d915b] 2016-05-23 19:23:36 -0400
-->
     <para>
      Fix <quote>unrecognized node type</> error for <command>INSERT ... ON
      CONFLICT</> within a recursive CTE (a <literal>WITH</> item) (Peter
      Geoghegan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [26e66184d] 2016-05-11 16:20:23 -0400
Branch: REL9_5_STABLE [58d802410] 2016-05-11 16:20:03 -0400
-->
     <para>
      Fix <command>INSERT ... ON CONFLICT</> to successfully match index
      expressions or index predicates that are simplified during the
      planner's expression preprocessing phase (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9c810a2ed] 2016-07-04 16:09:11 -0400
Branch: REL9_5_STABLE [31ce32ade] 2016-07-04 16:09:11 -0400
-->
     <para>
      Correctly handle violations of exclusion constraints that apply to
      the target table of an <literal>INSERT ... ON CONFLICT</> command,
      but are not one of the selected arbiter indexes (Tom Lane)
     </para>

     <para>
      Such a case should raise a normal constraint-violation error, but it
      got into an infinite loop instead.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8a13d5e6d] 2016-05-11 17:06:53 -0400
Branch: REL9_5_STABLE [428484ce1] 2016-05-11 17:06:53 -0400
-->
     <para>
      Fix <command>INSERT ... ON CONFLICT</> to not fail if the target
      table has a unique index on OID (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4c56f3269] 2016-06-16 17:16:32 -0400
Branch: REL9_5_STABLE [a41b14f94] 2016-06-16 17:16:40 -0400
Branch: REL9_4_STABLE [2a8b5d210] 2016-06-16 17:16:44 -0400
Branch: REL9_3_STABLE [519445ba2] 2016-06-16 17:16:48 -0400
Branch: REL9_2_STABLE [f66e0fec3] 2016-06-16 17:16:53 -0400
Branch: REL9_1_STABLE [7b97dafa2] 2016-06-16 17:16:58 -0400
-->
     <para>
      Make the <type>inet</> and <type>cidr</> data types properly reject
      IPv6 addresses with too many colon-separated fields (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [278148907] 2016-07-16 14:42:37 -0400
Branch: REL9_5_STABLE [884bae143] 2016-07-16 14:42:37 -0400
Branch: REL9_4_STABLE [59fa0195c] 2016-07-16 14:42:37 -0400
Branch: REL9_3_STABLE [16e28fcec] 2016-07-16 14:42:37 -0400
Branch: REL9_2_STABLE [89b301104] 2016-07-16 14:42:37 -0400
Branch: REL9_1_STABLE [608cc0c41] 2016-07-16 14:42:37 -0400
-->
     <para>
      Prevent crash in <function>close_ps()</>
      (the <type>point</> <literal>##</> <type>lseg</> operator)
      for NaN input coordinates (Tom Lane)
     </para>

     <para>
      Make it return NULL instead of crashing.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0daeba0e9] 2016-07-01 11:40:33 -0400
Branch: REL9_5_STABLE [40d0bd8d5] 2016-07-01 11:40:22 -0400
Branch: REL9_4_STABLE [b25d87f91] 2016-07-01 11:40:22 -0400
Branch: REL9_3_STABLE [b0f20c2ea] 2016-07-01 11:40:22 -0400
-->
     <para>
      Avoid possible crash in <function>pg_get_expr()</> when inconsistent
      values are passed to it (Michael Paquier, Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [9a46324fd] 2016-08-08 11:12:59 -0400
Branch: REL9_5_STABLE [04cee8f83] 2016-08-08 11:13:25 -0400
Branch: REL9_4_STABLE [20f870fd7] 2016-08-08 11:13:34 -0400
Branch: REL9_3_STABLE [43d7a0af5] 2016-08-08 11:13:40 -0400
Branch: REL9_2_STABLE [b0134fe84] 2016-08-08 11:13:45 -0400
Branch: REL9_1_STABLE [d555d2642] 2016-08-08 11:13:51 -0400
-->
     <para>
      Fix several one-byte buffer over-reads in <function>to_number()</>
      (Peter Eisentraut)
     </para>

     <para>
      In several cases the <function>to_number()</> function would read one
      more character than it should from the input string.  There is a
      small chance of a crash, if the input happens to be adjacent to the
      end of memory.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [874fe3aea] 2016-06-27 15:57:50 -0400
Branch: REL9_5_STABLE [1651b9aa2] 2016-06-27 15:57:21 -0400
Branch: REL9_4_STABLE [dc9e03bf4] 2016-06-27 15:57:21 -0400
Branch: REL9_3_STABLE [17bfef80e] 2016-06-27 15:57:21 -0400
-->
     <para>
      Do not run the planner on the query contained in <literal>CREATE
      MATERIALIZED VIEW</> or <literal>CREATE TABLE AS</>
      when <literal>WITH NO DATA</> is specified (Michael Paquier,
      Tom Lane)
     </para>

     <para>
      This avoids some unnecessary failure conditions, for example if a
      stable function invoked by the materialized view depends on a table
      that doesn't exist yet.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [bfa2ab56b] 2016-07-15 17:49:48 -0700
Branch: REL9_5_STABLE [1f9534b49] 2016-07-15 17:49:48 -0700
Branch: REL9_4_STABLE [3d5b227ba] 2016-07-15 17:49:48 -0700
Branch: REL9_3_STABLE [2e51ae1f6] 2016-07-15 17:49:48 -0700
Branch: REL9_2_STABLE [941557f18] 2016-07-15 17:49:48 -0700
Branch: REL9_1_STABLE [37276017f] 2016-07-15 17:49:49 -0700
-->
     <para>
      Avoid unsafe intermediate state during expensive paths
      through <function>heap_update()</> (Masahiko Sawada, Andres Freund)
     </para>

     <para>
      Previously, these cases locked the target tuple (by setting its XMAX)
      but did not WAL-log that action, thus risking data integrity problems
      if the page were spilled to disk and then a database crash occurred
      before the tuple update could be completed.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [a4d357bfb] 2016-07-15 14:45:37 -0700
Branch: REL9_5_STABLE [b33e81cba] 2016-07-15 14:45:38 -0700
Branch: REL9_4_STABLE [f66828ba6] 2016-07-15 14:50:46 -0700
Branch: REL9_3_STABLE [46acbeb2f] 2016-07-15 14:51:03 -0700
-->
     <para>
      Fix hint bit update during WAL replay of row locking operations
      (Andres Freund)
     </para>

     <para>
      The only known consequence of this problem is that row locks held by
      a prepared, but uncommitted, transaction might fail to be enforced
      after a crash and restart.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [533e9c6b0] 2016-07-15 14:17:20 -0400
Branch: REL9_5_STABLE [649dd1b58] 2016-07-15 14:17:20 -0400
Branch: REL9_4_STABLE [166873dd0] 2016-07-15 14:17:20 -0400
Branch: REL9_3_STABLE [6c243f90a] 2016-07-15 14:17:20 -0400
-->
     <para>
      Avoid unnecessary <quote>could not serialize access</> errors when
      acquiring <literal>FOR KEY SHARE</> row locks in serializable mode
      (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [69f526aa4] 2016-06-03 15:14:50 -0400
Branch: REL9_5_STABLE [a102f98e2] 2016-06-03 15:14:35 -0400
Branch: master [9eaf5be50] 2016-06-03 18:07:14 -0400
Branch: REL9_5_STABLE [8355897ff] 2016-06-03 18:07:14 -0400
-->
     <para>
      Make sure <quote>expanded</> datums returned by a plan node are
      read-only (Tom Lane)
     </para>

     <para>
      This avoids failures in some cases where the result of a lower plan
      node is referenced in multiple places in upper nodes.  So far as
      core <productname>PostgreSQL</> is concerned, only array values
      returned by PL/pgSQL functions are at risk; but extensions might
      use expanded datums for other things.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0b0baf262] 2016-06-16 12:17:38 -0400
Branch: REL9_5_STABLE [4f5995dd9] 2016-06-16 12:17:11 -0400
Branch: REL9_4_STABLE [e542bfe61] 2016-06-16 12:17:16 -0400
Branch: REL9_3_STABLE [29987b2e1] 2016-06-16 12:17:20 -0400
Branch: REL9_2_STABLE [23ed284a5] 2016-06-16 12:17:25 -0400
Branch: master [e45e990e4] 2016-06-22 11:55:18 -0400
Branch: REL9_5_STABLE [f2c28bb1f] 2016-06-22 11:55:24 -0400
Branch: REL9_4_STABLE [f22a3e5ce] 2016-06-22 11:55:28 -0400
Branch: REL9_3_STABLE [dafdcbb6c] 2016-06-22 11:55:32 -0400
Branch: REL9_2_STABLE [dd41661d2] 2016-06-22 11:55:35 -0400
-->
     <para>
      Avoid crash in <literal>postgres -C</> when the specified variable
      has a null string value (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [80b346c20] 2016-07-29 12:52:57 -0400
Branch: REL9_5_STABLE [c8966a925] 2016-07-29 12:53:02 -0400
-->
     <para>
      Prevent unintended waits for the receiver in WAL sender processes
      (Kyotaro Horiguchi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f8c58554d] 2016-06-30 12:37:02 -0400
Branch: REL9_5_STABLE [8caf9fe62] 2016-06-30 12:37:02 -0400
Branch: REL9_4_STABLE [1843d88e0] 2016-06-30 12:37:02 -0400
-->
     <para>
      Fix possible loss of large subtransactions in logical decoding
      (Petru-Florin Mihancea)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bcbecbce2] 2016-08-07 13:15:55 -0400
Branch: REL9_5_STABLE [71dca408c] 2016-08-07 13:15:55 -0400
Branch: REL9_4_STABLE [c63588feb] 2016-08-07 13:15:55 -0400
-->
     <para>
      Fix failure of logical decoding when a subtransaction contains no
      actual changes (Marko Tiikkaja, Andrew Gierth)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [52e8fc3e2] 2016-05-25 17:48:15 -0400
Branch: REL9_5_STABLE [b2355a29c] 2016-05-25 17:48:15 -0400
Branch: REL9_4_STABLE [4b612a78f] 2016-05-25 17:48:15 -0400
Branch: REL9_3_STABLE [463207630] 2016-05-25 17:48:15 -0400
-->
     <para>
      Ensure that backends see up-to-date statistics for shared catalogs
      (Tom Lane)
     </para>

     <para>
      The statistics collector failed to update the statistics file for
      shared catalogs after a request from a regular backend.  This problem
      was partially masked because the autovacuum launcher regularly makes
      requests that did cause such updates; however, it became obvious with
      autovacuum disabled.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [22b27b4c9] 2016-05-31 15:55:15 -0400
Branch: REL9_5_STABLE [47215c16f] 2016-05-31 15:54:46 -0400
Branch: REL9_4_STABLE [3ffff7257] 2016-05-31 15:54:46 -0400
Branch: REL9_3_STABLE [a84cad224] 2016-05-31 15:54:47 -0400
-->
     <para>
      Avoid redundant writes of the statistics files when multiple
      backends request updates close together (Tom Lane, Tomas Vondra)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [996d27397] 2016-05-24 15:20:36 -0400
Branch: REL9_5_STABLE [a34c3dd50] 2016-05-24 15:20:12 -0400
Branch: REL9_4_STABLE [defe936ef] 2016-05-24 15:20:12 -0400
Branch: REL9_3_STABLE [9f3e4c813] 2016-05-24 15:20:12 -0400
Branch: REL9_2_STABLE [2e7f0c34a] 2016-05-24 15:20:12 -0400
Branch: REL9_1_STABLE [fe1731fca] 2016-05-24 15:20:12 -0400
Branch: master [2d2e40e3b] 2016-05-24 15:47:51 -0400
Branch: REL9_5_STABLE [bbbe2c97e] 2016-05-24 15:47:51 -0400
Branch: REL9_4_STABLE [edd8873ff] 2016-05-24 15:47:51 -0400
Branch: REL9_3_STABLE [ff98ae908] 2016-05-24 15:47:51 -0400
Branch: REL9_2_STABLE [4cf0978ea] 2016-05-24 15:47:51 -0400
Branch: REL9_1_STABLE [5551dac59] 2016-05-24 15:47:51 -0400
-->
     <para>
      Avoid consuming a transaction ID during <command>VACUUM</>
      (Alexander Korotkov)
     </para>

     <para>
      Some cases in <command>VACUUM</> unnecessarily caused an XID to be
      assigned to the current transaction.  Normally this is negligible,
      but if one is up against the XID wraparound limit, consuming more
      XIDs during anti-wraparound vacuums is a very bad thing.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [e3ad3ffa6] 2016-06-24 18:29:28 -0400
Branch: REL9_5_STABLE [d372cb173] 2016-06-24 18:29:28 -0400
Branch: REL9_4_STABLE [61b24fef8] 2016-06-24 18:29:28 -0400
Branch: REL9_3_STABLE [28f294afd] 2016-06-24 18:29:28 -0400
-->
     <para>
      Prevent possible failure when vacuuming multixact IDs in an
      installation that has been pg_upgrade'd from pre-9.3 (Andrew Gierth,
      &Aacute;lvaro Herrera)
     </para>

     <para>
      The usual symptom of this bug is errors
      like <quote>MultiXactId <replaceable>NNN</> has not been created
      yet -- apparent wraparound</quote>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f64340e74] 2016-06-06 17:44:17 -0400
Branch: REL9_5_STABLE [5acc58c5e] 2016-06-06 17:44:17 -0400
Branch: REL9_4_STABLE [a4400c251] 2016-06-06 17:44:17 -0400
Branch: REL9_3_STABLE [5f3e0e84b] 2016-06-06 17:44:17 -0400
Branch: REL9_2_STABLE [3201709de] 2016-06-06 17:44:18 -0400
Branch: REL9_1_STABLE [32ceb8dfb] 2016-06-06 17:44:18 -0400
-->
     <para>
      When a manual <command>ANALYZE</> specifies a column list, don't
      reset the table's <literal>changes_since_analyze</> counter
      (Tom Lane)
     </para>

     <para>
      If we're only analyzing some columns, we should not prevent routine
      auto-analyze from happening for the other columns.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [95bee941b] 2016-08-07 18:52:02 -0400
Branch: REL9_5_STABLE [cb5c14984] 2016-08-07 18:52:02 -0400
Branch: REL9_4_STABLE [8f180a6cc] 2016-08-07 18:52:02 -0400
Branch: REL9_3_STABLE [20a859504] 2016-08-07 18:52:02 -0400
Branch: REL9_2_STABLE [127d73009] 2016-08-07 18:52:02 -0400
Branch: REL9_1_STABLE [a449ad095] 2016-08-07 18:52:02 -0400
-->
     <para>
      Fix <command>ANALYZE</>'s overestimation of <literal>n_distinct</>
      for a unique or nearly-unique column with many null entries (Tom
      Lane)
     </para>

     <para>
      The nulls could get counted as though they were themselves distinct
      values, leading to serious planner misestimates in some types of
      queries.
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [15739393e] 2016-05-10 16:23:54 -0300
Branch: REL9_5_STABLE [7516cdb76] 2016-05-10 16:23:54 -0300
Branch: REL9_4_STABLE [e9a273199] 2016-05-10 16:23:54 -0300
Branch: REL9_3_STABLE [92ebe509e] 2016-05-10 16:23:54 -0300
Branch: REL9_2_STABLE [ca4c6d043] 2016-05-10 16:23:54 -0300
Branch: REL9_1_STABLE [2152762c5] 2016-05-10 16:23:54 -0300
-->
     <para>
      Prevent autovacuum from starting multiple workers for the same shared
      catalog (&Aacute;lvaro Herrera)
     </para>

     <para>
      Normally this isn't much of a problem because the vacuum doesn't take
      long anyway; but in the case of a severely bloated catalog, it could
      result in all but one worker uselessly waiting instead of doing
      useful work on other tables.
     </para>
    </listitem>

    <listitem>
<!--
Author: Kevin Grittner <kgrittn@postgresql.org>
Branch: master [7392eed7c] 2016-06-02 12:23:01 -0500
Branch: REL9_5_STABLE [236d569f9] 2016-06-02 12:23:19 -0500
-->
     <para>
      Fix bug in b-tree mark/restore processing (Kevin Grittner)
     </para>

     <para>
      This error could lead to incorrect join results or assertion failures
      in a merge join whose inner source node is a b-tree indexscan.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e89526d4f] 2016-08-06 14:28:37 -0400
Branch: REL9_5_STABLE [ee5d1de04] 2016-08-06 14:28:37 -0400
Branch: REL9_4_STABLE [98d5f366b] 2016-08-06 14:28:38 -0400
-->
     <para>
      Avoid duplicate buffer lock release when abandoning a b-tree index
      page deletion attempt (Tom Lane)
     </para>

     <para>
      This mistake prevented <command>VACUUM</> from completing in some
      cases involving corrupt b-tree indexes.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8cf739de8] 2016-06-24 16:57:36 -0400
Branch: REL9_5_STABLE [07f69137b] 2016-06-24 16:57:36 -0400
-->
     <para>
      Fix building of large (bigger than <varname>shared_buffers</>)
      hash indexes (Tom Lane)
     </para>

     <para>
      The code path used for large indexes contained a bug causing
      incorrect hash values to be inserted into the index, so that
      subsequent index searches always failed, except for tuples inserted
      into the index after the initial build.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1acf75725] 2016-07-14 18:45:59 -0400
Branch: REL9_5_STABLE [503546376] 2016-07-14 18:46:00 -0400
Branch: REL9_4_STABLE [054052b3a] 2016-07-14 18:46:00 -0400
Branch: REL9_3_STABLE [57dba87a7] 2016-07-14 18:46:00 -0400
Branch: REL9_2_STABLE [042009f24] 2016-07-14 18:46:00 -0400
-->
     <para>
      Prevent infinite loop in GiST index build for geometric columns
      containing NaN component values (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8a859691d] 2016-06-05 11:53:06 -0400
Branch: REL9_5_STABLE [a7aa61ffe] 2016-06-05 11:53:06 -0400
-->
     <para>
      Fix possible crash during a nearest-neighbor (<literal>ORDER BY</>
      distance) indexscan on a <filename>contrib/btree_gist</> index on
      an <type>interval</> column (Peter Geoghegan)
     </para>
    </listitem>

    <listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [975ad4e60] 2016-05-30 14:47:22 -0400
Branch: REL9_5_STABLE [2973d7d02] 2016-05-30 14:47:22 -0400
-->
     <para>
      Fix <quote>PANIC: failed to add BRIN tuple</> error when attempting
      to update a BRIN index entry (&Aacute;lvaro Herrera)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8d498a5c8] 2016-08-04 16:06:14 -0400
Branch: REL9_5_STABLE [c1d6ee879] 2016-08-04 16:06:14 -0400
-->
     <para>
      Fix possible crash during background worker shutdown (Dmitry Ivanov)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [baebab3ac] 2016-07-12 18:07:03 -0400
Branch: REL9_5_STABLE [a0943dbbe] 2016-07-12 18:06:50 -0400
-->
     <para>
      Fix PL/pgSQL's handling of the <literal>INTO</> clause
      within <command>IMPORT FOREIGN SCHEMA</> commands (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [f36ca9af0] 2016-07-17 09:15:37 -0400
Branch: REL9_5_STABLE [fb279fc7a] 2016-07-17 09:24:06 -0400
Branch: REL9_4_STABLE [97d741650] 2016-07-17 09:37:33 -0400
Branch: REL9_3_STABLE [805f2bb53] 2016-07-17 09:38:23 -0400
Branch: REL9_2_STABLE [6c0be49b2] 2016-07-17 09:39:51 -0400
Branch: REL9_1_STABLE [84d679204] 2016-07-17 09:41:08 -0400
-->
     <para>
      Fix <filename>contrib/btree_gin</> to handle the smallest
      possible <type>bigint</> value correctly (Peter Eisentraut)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [69dc5ae40] 2016-08-05 18:58:12 -0400
Branch: REL9_5_STABLE [cae0d4f9b] 2016-08-05 18:58:19 -0400
Branch: REL9_4_STABLE [a3cd60ebf] 2016-08-05 18:58:23 -0400
Branch: REL9_3_STABLE [c3107f18a] 2016-08-05 18:58:28 -0400
Branch: REL9_2_STABLE [3e40d9227] 2016-08-05 18:58:32 -0400
Branch: REL9_1_STABLE [1f63b0e09] 2016-08-05 18:58:36 -0400
-->
     <para>
      Teach libpq to correctly decode server version from future servers
      (Peter Eisentraut)
     </para>

     <para>
      It's planned to switch to two-part instead of three-part server
      version numbers for releases after 9.6.  Make sure
      that <function>PQserverVersion()</> returns the correct value for
      such cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [3ebc88e56] 2016-08-01 15:08:12 +0200
Branch: REL9_5_STABLE [dc6b20c6b] 2016-08-01 15:09:23 +0200
Branch: REL9_4_STABLE [057404854] 2016-08-01 15:09:12 +0200
Branch: REL9_3_STABLE [3ca359426] 2016-08-01 15:08:59 +0200
Branch: REL9_2_STABLE [295edbecf] 2016-08-01 15:08:48 +0200
Branch: REL9_1_STABLE [c15f502b6] 2016-08-01 15:08:36 +0200
-->
     <para>
      Fix <application>ecpg</>'s code for <literal>unsigned long long</>
      array elements (Michael Meskes)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e2e95f5ef] 2016-08-02 12:49:40 -0400
Branch: REL9_5_STABLE [89c30d113] 2016-08-02 12:49:41 -0400
Branch: REL9_4_STABLE [2ff8a2fc0] 2016-08-02 12:49:04 -0400
Branch: REL9_3_STABLE [6693c9d7b] 2016-08-02 12:49:09 -0400
Branch: REL9_2_STABLE [a5a7caaa1] 2016-08-02 12:49:15 -0400
-->
     <para>
      In <application>pg_dump</> with both <option>-c</> and <option>-C</>
      options, avoid emitting an unwanted <literal>CREATE SCHEMA public</>
      command (David Johnston, Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e652273e0] 2016-06-02 13:28:17 -0400
Branch: REL9_5_STABLE [404429038] 2016-06-02 13:28:18 -0400
Branch: REL9_4_STABLE [96aac0e6d] 2016-06-02 13:27:53 -0400
Branch: REL9_3_STABLE [5c9724305] 2016-06-02 13:27:53 -0400
Branch: master [6c72a28e5] 2016-06-03 11:29:38 -0400
Branch: REL9_5_STABLE [ec5622351] 2016-06-03 11:29:20 -0400
Branch: REL9_4_STABLE [53c2601a5] 2016-06-03 11:29:20 -0400
Branch: REL9_3_STABLE [4a21c6fd7] 2016-06-03 11:29:20 -0400
-->
     <para>
      Improve handling of <systemitem>SIGTERM</>/control-C in
      parallel <application>pg_dump</> and <application>pg_restore</> (Tom
      Lane)
     </para>

     <para>
      Make sure that the worker processes will exit promptly, and also arrange
      to send query-cancel requests to the connected backends, in case they
      are doing something long-running such as a <command>CREATE INDEX</>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9abd64ec9] 2016-05-25 12:40:12 -0400
Branch: REL9_5_STABLE [af6555b80] 2016-05-25 12:39:57 -0400
Branch: REL9_4_STABLE [ea274b2f4] 2016-05-25 12:39:57 -0400
Branch: REL9_3_STABLE [1c8205159] 2016-05-25 12:39:57 -0400
-->
     <para>
      Fix error reporting in parallel <application>pg_dump</>
      and <application>pg_restore</> (Tom Lane)
     </para>

     <para>
      Previously, errors reported by <application>pg_dump</>
      or <application>pg_restore</> worker processes might never make it to
      the user's console, because the messages went through the master
      process, and there were various deadlock scenarios that would prevent
      the master process from passing on the messages.  Instead, just print
      everything to <literal>stderr</>.  In some cases this will result in
      duplicate messages (for instance, if all the workers report a server
      shutdown), but that seems better than no message.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [df8d2d8c4] 2016-05-26 10:50:30 -0400
Branch: REL9_5_STABLE [6479df137] 2016-05-26 10:50:38 -0400
Branch: REL9_4_STABLE [d32bc204c] 2016-05-26 10:50:42 -0400
Branch: REL9_3_STABLE [b9784e1f7] 2016-05-26 10:50:46 -0400
-->
     <para>
      Ensure that parallel <application>pg_dump</>
      or <application>pg_restore</> on Windows will shut down properly
      after an error (Kyotaro Horiguchi)
     </para>

     <para>
      Previously, it would report the error, but then just sit until
      manually stopped by the user.
     </para>
    </listitem>

    <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [d74048def] 2016-05-26 22:14:23 +0200
Branch: REL9_5_STABLE [47e596976] 2016-05-26 22:18:04 +0200
-->
     <para>
      Make parallel <application>pg_dump</> fail cleanly when run against a
      standby server (Magnus Hagander)
     </para>

     <para>
      This usage is not supported
      unless <option>--no-synchronized-snapshots</> is specified, but the
      error was not handled very well.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cae2bb198] 2016-05-26 11:51:04 -0400
Branch: REL9_5_STABLE [64b296976] 2016-05-26 11:51:11 -0400
Branch: REL9_4_STABLE [f2f18a37c] 2016-05-26 11:51:16 -0400
Branch: REL9_3_STABLE [99565a1ef] 2016-05-26 11:51:20 -0400
-->
     <para>
      Make <application>pg_dump</> behave better when built without zlib
      support (Kyotaro Horiguchi)
     </para>

     <para>
      It didn't work right for parallel dumps, and emitted some rather
      pointless warnings in other cases.
     </para>
    </listitem>

    <listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [74d8c95b7] 2016-08-01 17:36:14 +0900
Branch: REL9_5_STABLE [928e92fda] 2016-08-01 17:37:18 +0900
Branch: REL9_4_STABLE [dbe56f2a1] 2016-08-01 17:37:41 +0900
Branch: REL9_3_STABLE [013f42372] 2016-08-01 17:37:53 +0900
Branch: REL9_2_STABLE [a21617759] 2016-08-01 17:38:00 +0900
Branch: REL9_1_STABLE [366f4a962] 2016-08-01 17:38:05 +0900
-->
     <para>
      Make <application>pg_basebackup</> accept <literal>-Z 0</> as
      specifying no compression (Fujii Masao)
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [e8564ef03] 2016-07-23 20:30:03 -0400
Branch: REL9_5_STABLE [cf35406f9] 2016-07-23 20:30:40 -0400
Branch: REL9_4_STABLE [f0c9e4697] 2016-07-23 20:30:44 -0400
Branch: REL9_3_STABLE [98b7a3cf2] 2016-07-23 20:30:48 -0400
Branch: REL9_2_STABLE [a4daf59ee] 2016-07-23 20:30:55 -0400
Branch: REL9_1_STABLE [b1fa6c0eb] 2016-07-23 20:30:59 -0400
-->
     <para>
      Fix makefiles' rule for building AIX shared libraries to be safe for
      parallel make (Noah Misch)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [30b2731bd] 2016-07-09 16:47:38 -0400
Branch: REL9_5_STABLE [f80395ca1] 2016-07-09 16:47:39 -0400
Branch: REL9_4_STABLE [02a898b00] 2016-07-09 16:47:39 -0400
Branch: REL9_3_STABLE [57e9ea2dd] 2016-07-11 11:24:04 -0400
Branch: REL9_2_STABLE [fdf2ee62e] 2016-07-11 11:24:04 -0400
Branch: REL9_1_STABLE [71af6c006] 2016-07-11 11:24:04 -0400
-->
     <para>
      Fix TAP tests and MSVC scripts to work when build directory's path
      name contains spaces (Michael Paquier, Kyotaro Horiguchi)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9dd4178ce] 2016-05-27 10:40:20 -0400
Branch: REL9_5_STABLE [cea17ba07] 2016-05-27 10:40:20 -0400
Branch: REL9_4_STABLE [c2651cd24] 2016-05-27 10:40:20 -0400
Branch: REL9_3_STABLE [1f1e70a87] 2016-05-27 10:40:20 -0400
-->
     <para>
      Be more predictable about reporting <quote>statement timeout</>
      versus <quote>lock timeout</> (Tom Lane)
     </para>

     <para>
      On heavily loaded machines, the regression tests sometimes failed due
      to reporting <quote>lock timeout</> even though the statement timeout
      should have occurred first.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b3399cb0f] 2016-07-21 13:11:00 -0400
Branch: REL9_5_STABLE [fd507d542] 2016-07-21 13:11:00 -0400
Branch: master [9d7abca90] 2016-07-22 15:41:39 -0400
Branch: REL9_5_STABLE [2aa2533f2] 2016-07-22 15:41:40 -0400
Branch: master [95810ed8e] 2016-07-21 14:24:07 -0400
Branch: REL9_5_STABLE [95e8b44f0] 2016-07-21 14:24:07 -0400
Branch: REL9_4_STABLE [dfddc452d] 2016-07-21 14:24:07 -0400
Branch: REL9_3_STABLE [0060638c8] 2016-07-21 14:24:07 -0400
Branch: REL9_2_STABLE [52502e7a5] 2016-07-21 14:24:07 -0400
Branch: REL9_1_STABLE [f61ecd01e] 2016-07-21 14:24:07 -0400
Branch: master [d70d11915] 2016-07-21 16:52:35 -0400
Branch: REL9_5_STABLE [d365dc3d1] 2016-07-21 16:52:36 -0400
Branch: REL9_4_STABLE [1156a9db8] 2016-07-21 16:52:36 -0400
Branch: REL9_3_STABLE [e15e7886e] 2016-07-21 16:52:36 -0400
Branch: REL9_2_STABLE [a1e750553] 2016-07-21 16:52:36 -0400
Branch: REL9_1_STABLE [ba64aed70] 2016-07-21 16:52:36 -0400
-->
     <para>
      Make regression tests safe for Danish and Welsh locales (Jeff Janes,
      Tom Lane)
     </para>

     <para>
      Change some test data that triggered the unusual sorting rules of
      these locales.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_5_STABLE [19d477aa6] 2016-07-19 15:59:36 -0400
Branch: REL9_4_STABLE [590a7f82b] 2016-07-19 15:59:36 -0400
Branch: REL9_3_STABLE [3928132ea] 2016-07-19 15:59:36 -0400
Branch: REL9_2_STABLE [cd951aa61] 2016-07-19 15:59:36 -0400
Branch: REL9_1_STABLE [5db14fad0] 2016-07-19 15:59:36 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_5_STABLE [0aabe80c6] 2016-07-19 17:53:31 -0400
Branch: REL9_4_STABLE [bdbcfba35] 2016-07-19 17:53:31 -0400
Branch: REL9_3_STABLE [f102bd868] 2016-07-19 17:53:31 -0400
Branch: REL9_2_STABLE [4d37b7cff] 2016-07-19 17:53:31 -0400
Branch: REL9_1_STABLE [d70df7867] 2016-07-19 17:53:31 -0400
-->
     <para>
      Update our copy of the timezone code to match
      IANA's <application>tzcode</> release 2016c (Tom Lane)
     </para>

     <para>
      This is needed to cope with anticipated future changes in the time
      zone data files.  It also fixes some corner-case bugs in coping with
      unusual time zones.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a629330b2] 2016-08-05 12:59:29 -0400
Branch: REL9_5_STABLE [3fddd6484] 2016-08-05 12:58:38 -0400
Branch: REL9_4_STABLE [8080337b0] 2016-08-05 12:58:46 -0400
Branch: REL9_3_STABLE [5630bd2ec] 2016-08-05 12:58:53 -0400
Branch: REL9_2_STABLE [7822792f7] 2016-08-05 12:58:58 -0400
Branch: REL9_1_STABLE [a44388ffe] 2016-08-05 12:59:02 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</> release 2016f
      for DST law changes in Kemerovo and Novosibirsk, plus historical
      corrections for Azerbaijan, Belarus, and Morocco.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-3">
  <title>Release 9.5.3</title>

  <formalpara>
  <title>Release date:</title>
  <para>2016-05-12</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.2.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.3</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, if you are upgrading from a version earlier than 9.5.2,
    see <xref linkend="release-9-5-2">.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

    <listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [7c7d4fdda] 2016-04-08 14:11:56 -0400
Branch: REL9_5_STABLE [a3c17b2af] 2016-05-06 23:47:42 -0400
Branch: REL9_4_STABLE [e3b14de9f] 2016-05-07 00:10:31 -0400
Branch: REL9_3_STABLE [a9d8644de] 2016-05-07 00:10:17 -0400
Branch: REL9_2_STABLE [e3a493ac0] 2016-05-07 00:05:39 -0400
Branch: REL9_1_STABLE [9b676fd49] 2016-05-07 00:09:37 -0400
-->
     <para>
      Clear the OpenSSL error queue before OpenSSL calls, rather than
      assuming it's clear already; and make sure we leave it clear
      afterwards (Peter Geoghegan, Dave Vitek, Peter Eisentraut)
     </para>

     <para>
      This change prevents problems when there are multiple connections
      using OpenSSL within a single process and not all the code involved
      follows the same rules for when to clear the error queue.
      Failures have been reported specifically when a client application
      uses SSL connections in <application>libpq</> concurrently with
      SSL connections using the PHP, Python, or Ruby wrappers for OpenSSL.
      It's possible for similar problems to arise within the server as well,
      if an extension module establishes an outgoing SSL connection.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [80f66a9ad] 2016-04-21 20:05:58 -0400
Branch: REL9_5_STABLE [94c685a7c] 2016-04-21 20:05:58 -0400
Branch: REL9_4_STABLE [3232c2427] 2016-04-21 20:05:58 -0400
Branch: REL9_3_STABLE [d9742ac46] 2016-04-21 20:05:58 -0400
Branch: REL9_2_STABLE [ad2d32b57] 2016-04-21 20:05:58 -0400
Branch: REL9_1_STABLE [6882dbd34] 2016-04-21 20:05:58 -0400
-->
     <para>
      Fix <quote>failed to build any <replaceable>N</>-way joins</quote>
      planner error with a full join enclosed in the right-hand side of a
      left join (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [207d5a656] 2016-04-29 20:19:38 -0400
Branch: REL9_5_STABLE [f25d0619c] 2016-04-29 20:19:38 -0400
Branch: REL9_4_STABLE [72edc8ffe] 2016-04-29 20:19:38 -0400
Branch: REL9_3_STABLE [67349e5a8] 2016-04-29 20:19:38 -0400
Branch: REL9_2_STABLE [f02cb8c9a] 2016-04-29 20:19:38 -0400
-->
     <para>
      Fix incorrect handling of equivalence-class tests in multilevel
      nestloop plans (Tom Lane)
     </para>

     <para>
      Given a three-or-more-way equivalence class of variables, such
      as <literal>X.X = Y.Y = Z.Z</>, it was possible for the planner to omit
      some of the tests needed to enforce that all the variables are actually
      equal, leading to join rows being output that didn't satisfy
      the <literal>WHERE</> clauses.  For various reasons, erroneous plans
      were seldom selected in practice, so that this bug has gone undetected
      for a long time.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [abb164655] 2016-04-21 23:17:36 -0400
Branch: REL9_5_STABLE [81deadd31] 2016-04-21 23:17:36 -0400
-->
     <para>
      Fix corner-case parser failures occurring
      when <xref linkend="guc-operator-precedence-warning"> is turned on
      (Tom Lane)
     </para>

     <para>
      An example is that <literal>SELECT (ARRAY[])::text[]</> gave an error,
      though it worked without the parentheses.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f0e766bd7] 2016-04-15 00:02:26 -0400
Branch: REL9_5_STABLE [edd57377f] 2016-04-15 00:02:26 -0400
Branch: REL9_4_STABLE [0479eccdc] 2016-04-15 00:02:26 -0400
-->
     <para>
      Fix query-lifespan memory leak in GIN index scans (Julien Rouhaud)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bde361fef] 2016-04-20 14:25:15 -0400
Branch: REL9_5_STABLE [be2754456] 2016-04-20 14:25:15 -0400
Branch: REL9_4_STABLE [ef35afa35] 2016-04-20 14:25:15 -0400
-->
     <para>
      Fix query-lifespan memory leak and potential index corruption hazard in
      GIN index insertion (Tom Lane)
     </para>

     <para>
      The memory leak would typically not amount to much in simple queries,
      but it could be very substantial during a large GIN index build with
      high <varname>maintenance_work_mem</>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d136d600f] 2016-05-06 12:09:20 -0400
Branch: REL9_5_STABLE [504af1fe0] 2016-05-06 12:09:20 -0400
Branch: REL9_4_STABLE [1180868d1] 2016-05-06 12:09:20 -0400
Branch: REL9_3_STABLE [462456d8d] 2016-05-06 12:09:20 -0400
Branch: REL9_2_STABLE [11247dd99] 2016-05-06 12:09:20 -0400
Branch: REL9_1_STABLE [7bad282c3] 2016-05-06 12:09:20 -0400
-->
     <para>
      Fix possible misbehavior of <literal>TH</>, <literal>th</>,
      and <literal>Y,YYY</> format codes in <function>to_timestamp()</>
      (Tom Lane)
     </para>

     <para>
      These could advance off the end of the input string, causing subsequent
      format codes to read garbage.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1f7c85b82] 2016-04-21 14:20:30 -0400
Branch: REL9_5_STABLE [4b52cc289] 2016-04-21 14:20:18 -0400
Branch: REL9_4_STABLE [679c92238] 2016-04-21 14:20:18 -0400
Branch: REL9_3_STABLE [e5882f26b] 2016-04-21 14:20:18 -0400
Branch: REL9_2_STABLE [c7c145e4f] 2016-04-21 14:20:18 -0400
Branch: REL9_1_STABLE [663624e60] 2016-04-21 14:20:18 -0400
-->
     <para>
      Fix dumping of rules and views in which the <replaceable>array</>
      argument of a <literal><replaceable>value</> <replaceable>operator</>
      ANY (<replaceable>array</>)</literal> construct is a sub-SELECT
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [99f3b5613] 2016-04-04 18:05:23 -0400
Branch: REL9_5_STABLE [f3d17491c] 2016-04-04 18:05:23 -0400
Branch: REL9_4_STABLE [28148e258] 2016-04-04 18:05:24 -0400
-->
     <para>
      Disallow newlines in <command>ALTER SYSTEM</> parameter values
      (Tom Lane)
     </para>

     <para>
      The configuration-file parser doesn't support embedded newlines in
      string literals, so we mustn't allow them in values to be inserted
      by <command>ALTER SYSTEM</>.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8f1911d5e] 2016-04-15 12:11:40 -0400
Branch: REL9_5_STABLE [8f8e65d34] 2016-04-15 12:11:27 -0400
Branch: REL9_4_STABLE [8eed31ffb] 2016-04-15 12:11:27 -0400
-->
     <para>
      Fix <command>ALTER TABLE ... REPLICA IDENTITY USING INDEX</> to
      work properly if an index on OID is selected (David Rowley)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [93c301fc4] 2016-04-08 12:31:53 -0400
Branch: REL9_5_STABLE [0da7cf6e8] 2016-04-08 12:31:42 -0400
-->
     <para>
      Avoid possible misbehavior after failing to remove a tablespace symlink
      (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6a3d3965d] 2016-04-14 19:42:21 -0400
Branch: REL9_5_STABLE [e7a456174] 2016-04-14 19:42:22 -0400
Branch: REL9_4_STABLE [00456911f] 2016-04-14 19:42:22 -0400
-->
     <para>
      Fix crash in logical decoding on alignment-picky platforms (Tom Lane,
      Andres Freund)
     </para>

     <para>
      The failure occurred only with a transaction large enough to spill to
      disk and a primary-key change within that transaction.
     </para>
    </listitem>

    <listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [59455018a] 2016-04-28 22:11:18 -0700
Branch: REL9_5_STABLE [2e1b4adf3] 2016-04-28 22:11:18 -0700
Branch: REL9_4_STABLE [596f93605] 2016-04-28 22:11:18 -0700
-->
     <para>
      Avoid repeated requests for feedback from receiver while shutting down
      walsender (Nick Cleaton)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cbabb70f3] 2016-04-20 23:48:13 -0400
Branch: REL9_5_STABLE [0b8e0bf0a] 2016-04-20 23:48:13 -0400
Branch: REL9_4_STABLE [f05ac711b] 2016-04-20 23:48:13 -0400
Branch: REL9_3_STABLE [691073bd8] 2016-04-20 23:48:13 -0400
Branch: REL9_2_STABLE [1b22368ff] 2016-04-20 23:48:13 -0400
Branch: REL9_1_STABLE [4c1c9f80b] 2016-04-20 23:48:13 -0400
-->
     <para>
      Make <application>pg_regress</> use a startup timeout from the
      <envar>PGCTLTIMEOUT</> environment variable, if that's set (Tom Lane)
     </para>

     <para>
      This is for consistency with a behavior recently added
      to <application>pg_ctl</>; it eases automated testing on slow machines.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6cead413b] 2016-04-13 18:58:14 -0400
Branch: REL9_5_STABLE [fb0f63933] 2016-04-13 18:57:52 -0400
Branch: REL9_4_STABLE [5daf1012a] 2016-04-13 18:57:52 -0400
Branch: REL9_3_STABLE [34bf6bc56] 2016-04-13 18:57:52 -0400
Branch: REL9_2_STABLE [6bb42d520] 2016-04-13 18:57:52 -0400
Branch: REL9_1_STABLE [3ef1f3a3e] 2016-04-13 18:57:52 -0400
-->
     <para>
      Fix <application>pg_upgrade</> to correctly restore extension
      membership for operator families containing only one operator class
      (Tom Lane)
     </para>

     <para>
      In such a case, the operator family was restored into the new database,
      but it was no longer marked as part of the extension.  This had no
      immediate ill effects, but would cause later <application>pg_dump</>
      runs to emit output that would cause (harmless) errors on restore.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1a2c17f8e] 2016-05-06 22:05:56 -0400
Branch: REL9_5_STABLE [196870f2f] 2016-05-06 22:05:51 -0400
Branch: REL9_4_STABLE [e1aecebc0] 2016-05-06 22:05:51 -0400
Branch: REL9_3_STABLE [e1d88f983] 2016-05-06 22:05:51 -0400
-->
     <para>
      Fix <application>pg_upgrade</> to not fail when new-cluster TOAST rules
      differ from old (Tom Lane)
     </para>

     <para>
      <application>pg_upgrade</> had special-case code to handle the
      situation where the new <productname>PostgreSQL</> version thinks that
      a table should have a TOAST table while the old version did not.  That
      code was broken, so remove it, and instead do nothing in such cases;
      there seems no reason to believe that we can't get along fine without
      a TOAST table if that was okay according to the old version's rules.
     </para>
    </listitem>

    <listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [213c7df03] 2016-04-26 21:53:58 -0400
Branch: REL9_5_STABLE [f9989482d] 2016-04-26 21:54:07 -0400
-->
     <para>
      Fix atomic operations for PPC when using IBM's XLC compiler (Noah Misch)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [75c24d0f7] 2016-04-18 13:33:06 -0400
Branch: REL9_5_STABLE [c6a5b6677] 2016-04-18 13:33:07 -0400
Branch: REL9_4_STABLE [21b7f49eb] 2016-04-18 13:33:07 -0400
Branch: REL9_3_STABLE [6ec1ff852] 2016-04-18 13:33:07 -0400
Branch: REL9_2_STABLE [b24f7e280] 2016-04-18 13:33:07 -0400
-->
     <para>
      Reduce the number of SysV semaphores used by a build configured with
      <option>--disable-spinlocks</> (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0ab3595e5] 2016-04-23 16:53:15 -0400
Branch: REL9_5_STABLE [bdf7744f7] 2016-04-23 16:53:15 -0400
Branch: REL9_4_STABLE [2a715371c] 2016-04-23 16:53:15 -0400
Branch: REL9_3_STABLE [252c35895] 2016-04-23 16:53:15 -0400
Branch: REL9_2_STABLE [0f5491283] 2016-04-23 16:53:15 -0400
Branch: REL9_1_STABLE [cbff4b708] 2016-04-23 16:53:15 -0400
-->
     <para>
      Rename internal function <function>strtoi()</>
      to <function>strtoint()</> to avoid conflict with a NetBSD library
      function (Thomas Munro)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_5_STABLE [20d4428f0] 2016-04-21 15:44:18 -0400
Branch: REL9_4_STABLE [5e2fb8862] 2016-04-21 15:44:18 -0400
Branch: REL9_3_STABLE [8f9518414] 2016-04-21 15:44:18 -0400
Branch: REL9_2_STABLE [6848827b4] 2016-04-21 15:44:18 -0400
Branch: REL9_1_STABLE [b2bb59bd5] 2016-04-21 15:44:18 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [125ad539a] 2016-04-21 16:58:47 -0400
Branch: REL9_5_STABLE [d2e59cbc3] 2016-04-21 16:58:59 -0400
Branch: REL9_4_STABLE [56dee70d9] 2016-04-21 16:59:04 -0400
Branch: REL9_3_STABLE [82bf369ed] 2016-04-21 16:59:08 -0400
Branch: REL9_2_STABLE [b5ebc513d] 2016-04-21 16:59:13 -0400
Branch: REL9_1_STABLE [9028f404e] 2016-04-21 16:59:17 -0400
-->
     <para>
      Fix reporting of errors from <function>bind()</>
      and <function>listen()</> system calls on Windows (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [01a07e6c1] 2016-04-08 12:37:20 -0400
Branch: REL9_5_STABLE [849167943] 2016-04-08 12:36:59 -0400
Branch: REL9_4_STABLE [f79a7fa90] 2016-04-08 12:29:31 -0400
Branch: REL9_3_STABLE [ca5d6edbf] 2016-04-08 12:29:34 -0400
Branch: REL9_2_STABLE [9e77d0e3c] 2016-04-08 12:29:36 -0400
Branch: REL9_1_STABLE [d2189a802] 2016-04-08 12:33:29 -0400
-->
     <para>
      Reduce verbosity of compiler output when building with Microsoft Visual
      Studio (Christian Ullrich)
     </para>
    </listitem>

    <listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [0fb54de9a] 2016-04-29 08:09:07 -0400
Branch: REL9_5_STABLE [da52474f3] 2016-04-29 08:06:25 -0400
Branch: master [7dc549238] 2016-04-29 09:49:31 -0400
Branch: REL9_5_STABLE [b71b4d852] 2016-04-29 09:50:38 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [23b09e15b] 2016-04-28 11:50:58 -0400
Branch: REL9_5_STABLE [94a16531b] 2016-04-28 11:51:08 -0400
Branch: REL9_4_STABLE [65c2eeb00] 2016-04-28 11:51:13 -0400
Branch: REL9_3_STABLE [707c44fe2] 2016-04-28 11:51:17 -0400
Branch: REL9_2_STABLE [c563d97c6] 2016-04-28 11:51:22 -0400
Branch: REL9_1_STABLE [a6c6789c4] 2016-04-28 11:51:26 -0400
-->
     <para>
      Support building with Visual Studio 2015
      (Michael Paquier, Petr Jel&iacute;nek)
     </para>

     <para>
      Note that builds made with VS2015 will not run on Windows versions
      before Windows Vista.
     </para>
    </listitem>

    <listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [9f633b404] 2016-04-22 05:18:59 -0400
Branch: REL9_5_STABLE [409c49c64] 2016-04-22 05:19:57 -0400
Branch: REL9_4_STABLE [c238a4101] 2016-04-22 05:20:07 -0400
Branch: REL9_3_STABLE [ab5c6d01f] 2016-04-22 05:20:18 -0400
-->
     <para>
      Fix <function>putenv()</> to work properly with Visual Studio 2013
      (Michael Paquier)
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7abc15716] 2016-03-29 11:55:19 -0400
Branch: REL9_5_STABLE [491e84738] 2016-03-29 11:54:57 -0400
Branch: REL9_4_STABLE [2fed676c9] 2016-03-29 11:54:57 -0400
Branch: REL9_3_STABLE [11cc7bb88] 2016-03-29 11:54:57 -0400
Branch: REL9_2_STABLE [b4b06931e] 2016-03-29 11:54:58 -0400
Branch: REL9_1_STABLE [6cd30292b] 2016-03-29 11:54:58 -0400
-->
     <para>
      Avoid possibly-unsafe use of Windows' <function>FormatMessage()</>
      function (Christian Ullrich)
     </para>

     <para>
      Use the <literal>FORMAT_MESSAGE_IGNORE_INSERTS</> flag where
      appropriate.  No live bug is known to exist here, but it seems like a
      good idea to be careful.
     </para>
    </listitem>

    <listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [98f158e41] 2016-05-05 20:08:58 -0400
Branch: REL9_5_STABLE [4edbb265c] 2016-05-05 20:09:10 -0400
Branch: REL9_4_STABLE [a5148e800] 2016-05-05 20:09:17 -0400
Branch: REL9_3_STABLE [d30c67af8] 2016-05-05 20:09:22 -0400
Branch: REL9_2_STABLE [29d154e36] 2016-05-05 20:09:27 -0400
Branch: REL9_1_STABLE [bfc39da64] 2016-05-05 20:09:32 -0400
-->
     <para>
      Update time zone data files to <application>tzdata</> release 2016d
      for DST law changes in Russia and Venezuela.  There are new zone
      names <literal>Europe/Kirov</> and <literal>Asia/Tomsk</> to reflect
      the fact that these regions now have different time zone histories from
      adjacent regions.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-2">
  <title>Release 9.5.2</title>

  <formalpara>
  <title>Release date:</title>
  <para>2016-03-31</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.1.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.2</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>

   <para>
    However, you may need to <command>REINDEX</> some indexes after applying
    the update, as per the first changelog entry below.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [3df9c374e] 2016-03-23 16:03:13 -0400
Branch: REL9_5_STABLE [8aa6e9780] 2016-03-23 16:04:35 -0400
-->

    <listitem>
     <para>
      Disable abbreviated keys for string sorting in non-<literal>C</>
      locales (Robert Haas)
     </para>

     <para>
      <productname>PostgreSQL</> 9.5 introduced logic for speeding up
      comparisons of string data types by using the standard C library
      function <function>strxfrm()</> as a substitute
      for <function>strcoll()</>.  It now emerges that most versions of
      glibc (Linux's implementation of the C library) have buggy
      implementations of <function>strxfrm()</> that, in some locales,
      can produce string comparison results that do not
      match <function>strcoll()</>.  Until this problem can be better
      characterized, disable the optimization in all non-<literal>C</>
      locales.  (<literal>C</> locale is safe since it uses
      neither <function>strcoll()</> nor <function>strxfrm()</>.)
     </para>

     <para>
      Unfortunately, this problem affects not only sorting but also entry
      ordering in B-tree indexes, which means that B-tree indexes
      on <type>text</>, <type>varchar</>, or <type>char</> columns may now
      be corrupt if they sort according to an affected locale and were
      built or modified under <productname>PostgreSQL</> 9.5.0 or 9.5.1.
      Users should <command>REINDEX</> indexes that might be affected.
     </para>

     <para>
      It is not possible at this time to give an exhaustive list of
      known-affected locales.  <literal>C</> locale is known safe, and
      there is no evidence of trouble in English-based locales such
      as <literal>en_US</>, but some other popular locales such
      as <literal>de_DE</> are affected in most glibc versions.
     </para>
    </listitem>

<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [86ebf30fd] 2016-03-28 09:03:20 -0400
Branch: REL9_5_STABLE [db69e58a0] 2016-03-28 09:03:41 -0400
-->

    <listitem>
     <para>
      Maintain row-security status properly in cached plans (Stephen Frost)
     </para>

     <para>
      In a session that performs queries as more than one role, the plan
      cache might incorrectly re-use a plan that was generated for another
      role ID, thus possibly applying the wrong set of policies when
      row-level security (RLS) is in use.
      (CVE-2016-2193)
     </para>
    </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [3e1338475] 2016-03-28 10:57:42 -0300
Branch: REL9_5_STABLE [bf78a6f10] 2016-03-28 10:57:46 -0300
-->

    <listitem>
     <para>
      Add must-be-superuser checks to some
      new <filename>contrib/pageinspect</> functions (Andreas Seltenreich)
     </para>

     <para>
      Most functions in the <filename>pageinspect</> extension that
      inspect <type>bytea</> values disallow calls by non-superusers,
      but <function>brin_page_type()</> and <function>brin_metapage_info()</>
      failed to do so.  Passing contrived <type>bytea</> values to them might
      crash the server or disclose a few bytes of server memory.  Add the
      missing permissions checks to prevent misuse.
      (CVE-2016-3065)
     </para>
    </listitem>

<!--
Author: Simon Riggs <simon@2ndQuadrant.com>
Branch: master [c7111d11b] 2016-03-03 09:53:43 +0000
Branch: REL9_5_STABLE [bf7ced5e2] 2016-03-03 09:50:38 +0000
-->

    <listitem>
     <para>
      Fix incorrect handling of indexed <literal>ROW()</> comparisons
      (Simon Riggs)
     </para>

     <para>
      Flaws in a minor optimization introduced in 9.5 caused incorrect
      results if the <literal>ROW()</> comparison matches the index ordering
      partially but not exactly (for example, differing column order, or the
      index contains both <literal>ASC</> and <literal>DESC</> columns).
      Pending a better solution, the optimization has been removed.
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a298a1e06] 2016-03-09 14:51:22 -0500
Branch: REL9_5_STABLE [b2ce9485b] 2016-03-09 14:51:01 -0500
Branch: REL9_4_STABLE [da936200d] 2016-03-09 14:51:01 -0500
Branch: REL9_3_STABLE [1ab7a160f] 2016-03-09 14:51:01 -0500
Branch: REL9_2_STABLE [c8e059724] 2016-03-09 14:51:01 -0500
Branch: REL9_1_STABLE [d485d9581] 2016-03-09 14:51:02 -0500
-->

    <listitem>
     <para>
      Fix incorrect handling of NULL index entries in
      indexed <literal>ROW()</> comparisons (Tom Lane)
     </para>

     <para>
      An index search using a row comparison such as <literal>ROW(a, b) &gt;
      ROW('x', 'y')</> would stop upon reaching a NULL entry in
      the <structfield>b</> column, ignoring the fact that there might be
      non-NULL <structfield>b</> values associated with later values
      of <structfield>a</>.
     </para>
    </listitem>

<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [1d4a0ab19] 2016-03-09 18:53:53 -0800
Branch: REL9_5_STABLE [301cc3549] 2016-03-09 18:53:53 -0800
Branch: REL9_4_STABLE [4f37d0916] 2016-03-09 18:53:54 -0800
Branch: REL9_3_STABLE [bfa282a02] 2016-03-09 18:53:54 -0800
Branch: REL9_2_STABLE [ce8f42919] 2016-03-09 18:53:54 -0800
Branch: REL9_1_STABLE [a62714fae] 2016-03-09 18:53:54 -0800
Branch: master [606e0f984] 2016-03-09 18:53:53 -0800
Branch: REL9_5_STABLE [63b06e8fa] 2016-03-09 18:53:53 -0800
Branch: REL9_4_STABLE [43b491a81] 2016-03-09 18:53:54 -0800
Branch: REL9_3_STABLE [e069848a3] 2016-03-09 18:53:54 -0800
Branch: REL9_2_STABLE [c224d44f7] 2016-03-09 18:53:54 -0800
Branch: REL9_1_STABLE [d0e47bcd4] 2016-03-09 18:53:54 -0800
-->

    <listitem>
     <para>
      Avoid unlikely data-loss scenarios due to renaming files without
      adequate <function>fsync()</> calls before and after (Michael Paquier,
      Tomas Vondra, Andres Freund)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [71404af2a] 2016-03-22 17:56:20 -0400
Branch: REL9_5_STABLE [d8d5a00b1] 2016-03-22 17:56:06 -0400
-->

    <listitem>
     <para>
      Fix incorrect behavior when rechecking a just-modified row in a query
      that does <command>SELECT FOR UPDATE/SHARE</> and contains some
      relations that need not be locked (Tom Lane)
     </para>

     <para>
      Rows from non-locked relations were incorrectly treated as containing
      all NULLs during the recheck, which could result in incorrectly
      deciding that the updated row no longer passes the <literal>WHERE</>
      condition, or in incorrectly outputting NULLs.
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a9d199f6d] 2016-03-02 23:31:39 -0500
Branch: REL9_5_STABLE [429d68465] 2016-03-02 23:31:39 -0500
Branch: REL9_4_STABLE [597e41e45] 2016-03-02 23:31:39 -0500
-->

    <listitem>
     <para>
      Fix bug in <function>json_to_record()</> when a field of its input
      object contains a sub-object with a field name matching one of the
      requested output column names (Tom Lane)
     </para>
    </listitem>

<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [94c745eb1] 2016-02-21 10:30:49 -0500
Branch: REL9_5_STABLE [68d68ff83] 2016-02-21 10:40:39 -0500
-->

    <listitem>
     <para>
      Fix nonsense result from two-argument form
      of <function>jsonb_object()</> when called with empty arrays
      (Michael Paquier, Andrew Dunstan)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [384dfbde1] 2016-03-23 10:43:13 -0400
Branch: REL9_5_STABLE [5f95521b3] 2016-03-23 10:43:24 -0400
-->

    <listitem>
     <para>
      Fix misbehavior in <function>jsonb_set()</> when converting a path
      array element into an integer for use as an array subscript
      (Michael Paquier)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [55c3a04d6] 2016-03-17 15:50:33 -0400
Branch: REL9_5_STABLE [d0a585c69] 2016-03-17 15:50:33 -0400
Branch: REL9_4_STABLE [17a250b18] 2016-03-17 15:50:33 -0400
-->

    <listitem>
     <para>
      Fix misformatting of negative time zone offsets
      by <function>to_char()</>'s <literal>OF</> format code
      (Thomas Munro, Tom Lane)
     </para>
    </listitem>

<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [fd658dbb3] 2016-03-15 18:04:39 -0400
Branch: REL9_5_STABLE [3f14d8d59] 2016-03-15 18:04:48 -0400
-->

    <listitem>
     <para>
      Fix possible incorrect logging of waits done by
      <command>INSERT ... ON CONFLICT</> (Peter Geoghegan)
     </para>

     <para>
      Log messages would sometimes claim that the wait was due to an
      exclusion constraint although no such constraint was responsible.
     </para>
    </listitem>

<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [d34794f7d] 2016-03-06 02:29:04 +0900
Branch: REL9_5_STABLE [f95f1ce00] 2016-03-06 02:43:17 +0900
Branch: REL9_4_STABLE [a9613ee69] 2016-03-06 02:43:26 +0900
-->

    <listitem>
     <para>
      Ignore <xref linkend="recovery-min-apply-delay"> parameter until
      recovery has reached a consistent state (Michael Paquier)
     </para>

     <para>
      Previously, standby servers would delay application of WAL records in
      response to <varname>recovery_min_apply_delay</> even while replaying
      the initial portion of WAL needed to make their database state valid.
      Since the standby is useless until it's reached a consistent database
      state, this was deemed unhelpful.
     </para>
    </listitem>

<!--
Author: Simon Riggs <simon@2ndQuadrant.com>
Branch: master [481725c0b] 2016-02-19 08:31:12 +0000
Branch: REL9_5_STABLE [c479024d3] 2016-02-19 08:31:39 +0000
Branch: REL9_4_STABLE [6830cae5f] 2016-02-19 08:32:28 +0000
Branch: REL9_3_STABLE [71e3cff2e] 2016-02-19 08:33:33 +0000
Branch: REL9_2_STABLE [c063d3c43] 2016-02-19 08:33:52 +0000
Branch: REL9_1_STABLE [ca32f125b] 2016-02-19 08:35:02 +0000
-->

    <listitem>
     <para>
      Correctly handle cases where <literal>pg_subtrans</> is close to XID
      wraparound during server startup (Jeff Janes)
     </para>
    </listitem>

<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [c8f621c43] 2016-03-05 18:02:20 -0800
Branch: REL9_5_STABLE [5990a034a] 2016-03-05 18:02:20 -0800
Branch: REL9_4_STABLE [3b94b3a49] 2016-03-05 18:02:20 -0800
Branch: master [fd45d16f6] 2016-03-06 16:27:20 -0800
Branch: REL9_5_STABLE [5d1826fe7] 2016-03-06 16:27:20 -0800
Branch: REL9_4_STABLE [fb3ea0465] 2016-03-06 16:27:20 -0800
Branch: master [b63bea5fd] 2016-03-07 14:24:03 -0800
Branch: REL9_5_STABLE [250e5bd71] 2016-03-07 14:24:52 -0800
Branch: REL9_4_STABLE [e3e84fd35] 2016-03-07 14:24:58 -0800
Author: Andres Freund <andres@anarazel.de>
Branch: master [0bda14d54] 2016-03-05 18:02:20 -0800
Branch: REL9_5_STABLE [e76e365be] 2016-03-05 18:02:20 -0800
Branch: REL9_4_STABLE [a50f50a65] 2016-03-05 18:02:20 -0800
Author: Andres Freund <andres@anarazel.de>
Branch: master [d9e903f3c] 2016-03-05 18:02:20 -0800
Branch: REL9_5_STABLE [6e759cefe] 2016-03-05 18:02:20 -0800
Branch: REL9_4_STABLE [465dd92d9] 2016-03-05 18:02:20 -0800
Author: Andres Freund <andres@anarazel.de>
Branch: master [7c17aac69] 2016-03-02 23:42:21 -0800
Branch: REL9_5_STABLE [f8a75881f] 2016-03-02 23:43:42 -0800
-->

    <listitem>
     <para>
      Fix assorted bugs in logical decoding (Andres Freund)
     </para>

     <para>
      Trouble cases included tuples larger than one page when replica
      identity is <literal>FULL</>, <command>UPDATE</>s that change a
      primary key within a transaction large enough to be spooled to disk,
      incorrect reports of <quote>subxact logged without previous toplevel
      record</>, and incorrect reporting of a transaction's commit time.
     </para>
    </listitem>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Branch: master [41fedc246] 2016-02-29 12:28:06 +0000
Branch: REL9_5_STABLE [f1dfcf63d] 2016-02-29 12:31:25 +0000
Branch: REL9_4_STABLE [9b69d5c1d] 2016-02-29 12:34:33 +0000
-->

    <listitem>
     <para>
      Fix planner error with nested security barrier views when the outer
      view has a <literal>WHERE</> clause containing a correlated subquery
      (Dean Rasheed)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ab4ff2889] 2016-03-13 16:44:31 -0400
Branch: REL9_5_STABLE [aa9c4e71c] 2016-03-13 16:44:10 -0400
-->

    <listitem>
     <para>
      Fix memory leak in GIN index searches (Tom Lane)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [907e4dd2b] 2016-02-28 23:39:20 -0500
Branch: REL9_5_STABLE [2d43c45e9] 2016-02-28 23:40:04 -0500
Branch: REL9_4_STABLE [80c925c7b] 2016-02-28 23:40:13 -0500
Branch: REL9_3_STABLE [0c4457de8] 2016-02-28 23:40:21 -0500
Branch: REL9_2_STABLE [47792639c] 2016-02-28 23:40:28 -0500
Branch: REL9_1_STABLE [7d6c58aa1] 2016-02-28 23:40:35 -0500
-->

    <listitem>
     <para>
      Fix corner-case crash due to trying to free <function>localeconv()</>
      output strings more than once (Tom Lane)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b3e05097e] 2016-03-06 19:20:55 -0500
Branch: REL9_5_STABLE [c2d61adc3] 2016-03-06 19:21:03 -0500
Branch: REL9_4_STABLE [3fa4715c5] 2016-03-06 19:21:03 -0500
Branch: REL9_3_STABLE [a35f85a52] 2016-03-06 19:21:03 -0500
Branch: REL9_2_STABLE [8894c9f79] 2016-03-06 19:21:03 -0500
Branch: REL9_1_STABLE [fe747b741] 2016-03-06 19:21:03 -0500
-->

    <listitem>
     <para>
      Fix parsing of affix files for <literal>ispell</> dictionaries
      (Tom Lane)
     </para>

     <para>
      The code could go wrong if the affix file contained any characters
      whose byte length changes during case-folding, for
      example <literal>I</> in Turkish UTF8 locales.
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [51e78ab4f] 2016-02-10 19:30:11 -0500
Branch: REL9_5_STABLE [b10635bb5] 2016-02-10 19:30:11 -0500
Branch: REL9_4_STABLE [19e469410] 2016-02-10 19:30:12 -0500
Branch: REL9_3_STABLE [24ce5754a] 2016-02-10 19:30:12 -0500
Branch: REL9_2_STABLE [64f99a2ee] 2016-02-10 19:30:12 -0500
Branch: REL9_1_STABLE [e56acbe2a] 2016-02-10 19:30:12 -0500
-->

    <listitem>
     <para>
      Avoid use of <function>sscanf()</> to parse <literal>ispell</>
      dictionary files (Artur Zakirov)
     </para>

     <para>
      This dodges a portability problem on FreeBSD-derived platforms
      (including macOS).
     </para>
    </listitem>

<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [5882ca668] 2016-02-19 22:47:50 -0500
Branch: REL9_5_STABLE [377a1af56] 2016-02-19 22:48:04 -0500
-->

    <listitem>
     <para>
      Fix atomic-operations code used on PPC with IBM's xlc compiler
      (Noah Misch)
     </para>

     <para>
      This error led to rare failures of concurrent operations on that
      platform.
     </para>
    </listitem>

<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [9d9038824] 2016-03-10 14:10:18 +0100
Branch: REL9_5_STABLE [ad9a15d3f] 2016-03-10 14:10:32 +0100
Branch: REL9_4_STABLE [8857488b6] 2016-03-10 14:10:41 +0100
Branch: REL9_3_STABLE [270d8a12e] 2016-03-10 14:10:48 +0100
Branch: REL9_2_STABLE [78b597808] 2016-03-10 14:10:54 +0100
Branch: REL9_1_STABLE [3e6385e27] 2016-03-10 14:11:01 +0100
-->

    <listitem>
     <para>
      Avoid a crash on old Windows versions (before 7SP1/2008R2SP1) with an
      AVX2-capable CPU and a Postgres build done with Visual Studio 2013
      (Christian Ullrich)
     </para>

     <para>
      This is a workaround for a bug in Visual Studio 2013's runtime
      library, which Microsoft have stated they will not fix in that
      version.
     </para>
    </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [9445db925] 2016-03-04 11:53:20 -0500
Branch: REL9_5_STABLE [0315dfa8f] 2016-03-04 11:57:22 -0500
Branch: REL9_4_STABLE [8de488d00] 2016-03-04 11:57:23 -0500
Branch: REL9_3_STABLE [54139ac22] 2016-03-04 11:57:31 -0500
Branch: REL9_2_STABLE [c658d5a9b] 2016-03-04 11:57:36 -0500
Branch: REL9_1_STABLE [b4895bf79] 2016-03-04 11:57:40 -0500
-->

    <listitem>
     <para>
      Fix <application>psql</>'s tab completion logic to handle multibyte
      characters properly (Kyotaro Horiguchi, Robert Haas)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_5_STABLE [1bee54e51] 2016-03-14 11:31:22 -0400
Branch: REL9_4_STABLE [13108dd0e] 2016-03-14 11:31:34 -0400
Branch: REL9_3_STABLE [0576de5c7] 2016-03-14 11:31:39 -0400
Branch: REL9_2_STABLE [39b3ea714] 2016-03-14 11:31:44 -0400
Branch: REL9_1_STABLE [2d61d88d8] 2016-03-14 11:31:49 -0400
-->

    <listitem>
     <para>
      Fix <application>psql</>'s tab completion for
      <literal>SECURITY LABEL</> (Tom Lane)
     </para>

     <para>
      Pressing TAB after <literal>SECURITY LABEL</> might cause a crash
      or offering of inappropriate keywords.
     </para>
    </listitem>

<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [2ffa86962] 2016-02-10 20:34:02 -0500
Branch: REL9_5_STABLE [725f0ce29] 2016-02-10 20:34:24 -0500
Branch: REL9_4_STABLE [4492ab53b] 2016-02-10 20:34:30 -0500
Branch: REL9_3_STABLE [198242ede] 2016-02-10 20:34:35 -0500
Branch: REL9_2_STABLE [4421b5253] 2016-02-10 20:34:41 -0500
Branch: REL9_1_STABLE [f97664cf5] 2016-02-10 20:34:48 -0500
-->

    <listitem>
     <para>
      Make <application>pg_ctl</> accept a wait timeout from the
      <envar>PGCTLTIMEOUT</> environment variable, if none is specified on
      the command line (Noah Misch)
     </para>

     <para>
      This eases testing of slower buildfarm members by allowing them
      to globally specify a longer-than-normal timeout for postmaster
      startup and shutdown.
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b642e50ae] 2016-03-07 10:40:44 -0500
Branch: REL9_5_STABLE [45b87cc57] 2016-03-07 10:40:53 -0500
Branch: REL9_4_STABLE [89f8372cb] 2016-03-07 10:40:57 -0500
Branch: REL9_3_STABLE [b73e81605] 2016-03-07 10:41:01 -0500
Branch: REL9_2_STABLE [15d43196c] 2016-03-07 10:41:07 -0500
Branch: REL9_1_STABLE [5a39c7395] 2016-03-07 10:41:11 -0500
-->

    <listitem>
     <para>
      Fix incorrect test for Windows service status
      in <application>pg_ctl</> (Manuel Mathar)
     </para>

     <para>
      The previous set of minor releases attempted to
      fix <application>pg_ctl</> to properly determine whether to send log
      messages to Window's Event Log, but got the test backwards.
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [47211af17] 2016-03-16 23:18:07 -0400
Branch: REL9_5_STABLE [8ee2e5f78] 2016-03-16 23:18:07 -0400
Branch: REL9_4_STABLE [23cb32660] 2016-03-16 23:18:07 -0400
Branch: REL9_3_STABLE [c02aae418] 2016-03-16 23:18:07 -0400
Branch: REL9_2_STABLE [be6f9ea2e] 2016-03-16 23:18:08 -0400
Branch: REL9_1_STABLE [1965a8ce1] 2016-03-16 23:18:08 -0400
-->

    <listitem>
     <para>
      Fix <application>pgbench</> to correctly handle the combination
      of <literal>-C</> and <literal>-M prepared</> options (Tom Lane)
     </para>
    </listitem>

<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [3386f34cd] 2016-02-18 18:32:27 -0500
Branch: REL9_5_STABLE [6f43c4d34] 2016-02-18 18:32:26 -0500
Branch: REL9_4_STABLE [bec4d0ffb] 2016-02-18 18:32:26 -0500
Branch: REL9_3_STABLE [bf26c4f44] 2016-02-18 18:32:26 -0500
-->

    <listitem>
     <para>
      In <application>pg_upgrade</>, skip creating a deletion script when
      the new data directory is inside the old data directory (Bruce
      Momjian)
     </para>

     <para>
      Blind application of the script in such cases would result in loss of
      the new data directory.
     </para>
    </listitem>

<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [e66197fa2] 2016-03-08 13:42:57 -0800
Branch: REL9_5_STABLE [68dababfe] 2016-03-08 13:42:58 -0800
Branch: REL9_4_STABLE [6041d388c] 2016-03-08 13:42:58 -0800
Branch: REL9_3_STABLE [44f9f1f2d] 2016-03-08 13:42:58 -0800
Branch: REL9_2_STABLE [ee06c97e4] 2016-03-08 13:42:58 -0800
Branch: REL9_1_STABLE [c5f1fbbfb] 2016-03-08 13:42:58 -0800
-->

    <listitem>
     <para>
      In PL/Perl, properly translate empty Postgres arrays into empty Perl
      arrays (Alex Hunsaker)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [66f503868] 2016-02-16 21:08:15 -0500
Branch: REL9_5_STABLE [2ce19f8a5] 2016-02-16 21:08:15 -0500
Branch: REL9_4_STABLE [f461fa7d0] 2016-02-16 21:08:15 -0500
Branch: REL9_3_STABLE [b3ec98c8b] 2016-02-16 21:08:15 -0500
Branch: REL9_2_STABLE [7d48349fd] 2016-02-16 21:08:15 -0500
Branch: REL9_1_STABLE [875973f5d] 2016-02-16 21:08:15 -0500
-->

    <listitem>
     <para>
      Make PL/Python cope with function names that aren't valid Python
      identifiers (Jim Nasby)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [48e6c943e] 2016-02-18 15:40:35 -0500
Branch: REL9_5_STABLE [0276bbd62] 2016-02-18 15:40:35 -0500
Branch: REL9_4_STABLE [b7547166f] 2016-02-18 15:40:35 -0500
Branch: REL9_3_STABLE [9dfb5b940] 2016-02-18 15:40:35 -0500
Branch: REL9_2_STABLE [29f299728] 2016-02-18 15:40:35 -0500
Branch: REL9_1_STABLE [0f359c7de] 2016-02-18 15:40:36 -0500
-->

    <listitem>
     <para>
      Fix multiple mistakes in the statistics returned
      by <filename>contrib/pgstattuple</>'s <function>pgstatindex()</>
      function (Tom Lane)
     </para>
    </listitem>

<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [5d0320105] 2016-03-19 18:36:35 -0400
Branch: REL9_5_STABLE [2f38b3e7d] 2016-03-19 18:44:04 -0400
Branch: REL9_4_STABLE [6336ca916] 2016-03-19 18:49:19 -0400
Branch: REL9_3_STABLE [a0adf3852] 2016-03-19 18:51:01 -0400
Branch: REL9_2_STABLE [89bf78a9b] 2016-03-19 18:51:01 -0400
Branch: REL9_1_STABLE [2aa9fd963] 2016-03-19 18:59:41 -0400
-->

    <listitem>
     <para>
      Remove dependency on <literal>psed</> in MSVC builds, since it's no
      longer provided by core Perl (Michael Paquier, Andrew Dunstan)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [676265eb7] 2016-03-25 19:03:08 -0400
Branch: REL9_5_STABLE [31d02ebf7] 2016-03-25 19:03:24 -0400
Branch: REL9_4_STABLE [de371e68a] 2016-03-25 19:03:32 -0400
Branch: REL9_3_STABLE [8e16592d4] 2016-03-25 19:03:39 -0400
Branch: REL9_2_STABLE [96fa37459] 2016-03-25 19:03:47 -0400
Branch: REL9_1_STABLE [e5fd35cc5] 2016-03-25 19:03:54 -0400
-->

    <listitem>
     <para>
      Update time zone data files to <application>tzdata</> release 2016c
      for DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia
      (Altai, Astrakhan, Kirov, Sakhalin, Ulyanovsk regions), plus
      historical corrections for Lithuania, Moldova, and Russia
      (Kaliningrad, Samara, Volgograd).
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5-1">
  <title>Release 9.5.1</title>

  <formalpara>
  <title>Release date:</title>
  <para>2016-02-11</para>
  </formalpara>

  <para>
   This release contains a variety of fixes from 9.5.0.
   For information about new features in the 9.5 major release, see
   <xref linkend="release-9-5">.
  </para>

  <sect2>
   <title>Migration to Version 9.5.1</title>

   <para>
    A dump/restore is not required for those running 9.5.X.
   </para>
  </sect2>

  <sect2>
   <title>Changes</title>

   <itemizedlist>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3bb3f42f3] 2016-02-08 10:25:40 -0500
Branch: REL9_5_STABLE [a61de2bc1] 2016-02-08 10:25:40 -0500
Branch: REL9_4_STABLE [fdc3139e2] 2016-02-08 10:25:40 -0500
Branch: REL9_3_STABLE [6403a6b74] 2016-02-08 10:25:40 -0500
Branch: REL9_2_STABLE [e93516cf7] 2016-02-08 10:25:40 -0500
Branch: REL9_1_STABLE [98d6b7305] 2016-02-08 10:25:40 -0500
-->

    <listitem>
     <para>
      Fix infinite loops and buffer-overrun problems in regular expressions
      (Tom Lane)
     </para>

     <para>
      Very large character ranges in bracket expressions could cause
      infinite loops in some cases, and memory overwrites in other cases.
      (CVE-2016-0773)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f867ce551] 2016-02-07 12:29:32 -0500
Branch: REL9_5_STABLE [129db3cbe] 2016-02-07 12:29:17 -0500
-->

    <listitem>
     <para>
      Fix an oversight that caused hash joins to miss joining to some tuples
      of the inner relation in rare cases (Tomas Vondra, Tom Lane)
     </para>
    </listitem>

<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [a6897efab] 2016-02-08 11:03:31 +0100
Branch: REL9_5_STABLE [87dbc72a7] 2016-02-08 11:03:37 +0100
-->

    <listitem>
     <para>
      Avoid pushdown of <literal>HAVING</> clauses when grouping sets are
      used (Andrew Gierth)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cc2ca9319] 2016-02-07 14:57:24 -0500
Branch: REL9_5_STABLE [82406d6ff] 2016-02-07 14:57:24 -0500
-->

    <listitem>
     <para>
      Fix deparsing of <literal>ON CONFLICT</> arbiter <literal>WHERE</>
      clauses (Peter Geoghegan)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b8682a715] 2016-01-26 15:38:33 -0500
Branch: REL9_5_STABLE [2acb682f6] 2016-01-26 15:38:33 -0500
Branch: REL9_4_STABLE [2b3983158] 2016-01-26 15:38:33 -0500
Branch: REL9_3_STABLE [9bbfca8fd] 2016-01-26 15:38:33 -0500
Branch: REL9_2_STABLE [3a7af9d73] 2016-01-26 15:38:33 -0500
Branch: REL9_1_STABLE [b043df093] 2016-01-26 15:38:33 -0500
-->

    <listitem>
     <para>
      Make <literal>%h</> and <literal>%r</> escapes
      in <varname>log_line_prefix</> work for messages emitted due
      to <varname>log_connections</> (Tom Lane)
     </para>

     <para>
      Previously, <literal>%h</>/<literal>%r</> started to work just after a
      new session had emitted the <quote>connection received</> log message;
      now they work for that message too.
     </para>
    </listitem>

<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [6a61d1ff9] 2016-01-14 13:06:03 +0100
Branch: REL9_5_STABLE [3276ca303] 2016-01-14 13:07:20 +0100
Branch: REL9_4_STABLE [ab49f87d5] 2016-01-14 13:07:35 +0100
Branch: REL9_3_STABLE [77d8edcf5] 2016-01-14 13:07:45 +0100
Branch: REL9_2_STABLE [df0bd5a0f] 2016-01-14 13:07:55 +0100
Branch: REL9_1_STABLE [b1c0f92eb] 2016-01-14 13:08:10 +0100
-->

    <listitem>
     <para>
      Avoid leaking a token handle during SSPI authentication
      (Christian Ullrich)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7e2247047] 2016-01-29 10:28:02 +0100
Branch: REL9_5_STABLE [56251f396] 2016-01-29 10:28:02 +0100
Branch: REL9_4_STABLE [5849b6e32] 2016-01-29 10:28:02 +0100
Branch: REL9_3_STABLE [db678ca16] 2016-01-29 10:28:03 +0100
Branch: REL9_2_STABLE [a362cc2e3] 2016-01-29 10:28:03 +0100
Branch: REL9_1_STABLE [ed5f57218] 2016-01-29 10:28:03 +0100
-->

    <listitem>
     <para>
      Fix <application>psql</>'s <literal>\det</> command to interpret its
      pattern argument the same way as other <literal>\d</> commands with
      potentially schema-qualified patterns do (Reece Hart)
     </para>
    </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [a96761391] 2016-01-07 11:59:08 -0300
Branch: REL9_5_STABLE [744d01c9a] 2016-01-07 11:59:08 -0300
Branch: REL9_4_STABLE [c7aca3d45] 2016-01-07 11:59:08 -0300
Branch: REL9_3_STABLE [74d4009b8] 2016-01-07 11:59:08 -0300
Branch: REL9_2_STABLE [5c4cbd5d1] 2016-01-07 11:59:08 -0300
Branch: REL9_1_STABLE [b96f6f444] 2016-01-07 11:59:08 -0300
-->

    <listitem>
     <para>
      In <application>pg_ctl</> on Windows, check service status to decide
      where to send output, rather than checking if standard output is a
      terminal (Michael Paquier)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e72d7d853] 2016-01-13 18:55:27 -0500
Branch: REL9_5_STABLE [c42df2d46] 2016-01-13 18:55:27 -0500
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Branch: REL9_3_STABLE [b87403f70] 2016-01-13 18:55:27 -0500
Branch: REL9_2_STABLE [be2b27651] 2016-01-13 18:55:27 -0500
Branch: REL9_1_STABLE [5108013db] 2016-01-13 18:55:27 -0500
-->

    <listitem>
     <para>
      Fix assorted corner-case bugs in <application>pg_dump</>'s processing
      of extension member objects (Tom Lane)
     </para>
    </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [df43fcf45] 2016-01-22 20:04:35 -0300
Branch: REL9_5_STABLE [1e910cf5b] 2016-01-22 20:04:35 -0300
-->

    <listitem>
     <para>
      Fix improper quoting of domain constraint names
      in <application>pg_dump</> (Elvis Pranskevichus)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0ed707e9b] 2016-02-04 00:26:10 -0500
Branch: REL9_5_STABLE [b99dd7170] 2016-02-04 00:26:10 -0500
Branch: REL9_4_STABLE [411e2b0d5] 2016-02-04 00:26:10 -0500
Branch: REL9_3_STABLE [aefbc208b] 2016-02-04 00:26:10 -0500
Branch: REL9_2_STABLE [4f58a7003] 2016-02-04 00:26:10 -0500
Branch: REL9_1_STABLE [9c704632c] 2016-02-04 00:26:10 -0500
-->

    <listitem>
     <para>
      Make <application>pg_dump</> mark a view's triggers as needing to be
      processed after its rule, to prevent possible failure during
      parallel <application>pg_restore</> (Tom Lane)
     </para>
    </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [64f5edca2] 2016-02-01 08:23:41 -0500
Branch: REL9_5_STABLE [829757c8a] 2016-02-01 08:26:07 -0500
Branch: REL9_4_STABLE [c33d1a8d5] 2016-02-03 09:15:29 -0500
Branch: REL9_3_STABLE [014796aa3] 2016-02-03 09:19:58 -0500
Branch: REL9_2_STABLE [b63a4f418] 2016-02-03 09:21:44 -0500
Branch: REL9_1_STABLE [4c8b07d3c] 2016-02-03 09:25:34 -0500
-->

    <listitem>
     <para>
      Install guards in <application>pgbench</> against corner-case overflow
      conditions during evaluation of script-specified division or modulo
      operators (Fabien Coelho, Michael Paquier)
     </para>
    </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [4aecd22d3] 2016-01-05 17:25:12 -0300
Branch: REL9_5_STABLE [7ef311eb4] 2016-01-05 17:25:12 -0300
-->

    <listitem>
     <para>
      Suppress useless warning message when <application>pg_receivexlog</>
      connects to a pre-9.4 server (Marco Nenciarini)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [866566a69] 2016-01-11 19:55:39 -0500
Branch: REL9_5_STABLE [db8fa56d6] 2016-01-11 19:55:39 -0500
Branch: REL9_4_STABLE [22815752e] 2016-01-11 19:55:40 -0500
Branch: REL9_3_STABLE [0ddeaba7e] 2016-01-11 19:55:40 -0500
Branch: REL9_2_STABLE [3843ba510] 2016-01-11 19:55:40 -0500
Branch: master [fb6fcbd33] 2016-01-11 20:06:36 -0500
Branch: REL9_5_STABLE [5ef26b8de] 2016-01-11 20:06:47 -0500
-->

    <listitem>
     <para>
      Avoid dump/reload problems when using both <application>plpython2</>
      and <application>plpython3</> (Tom Lane)
     </para>

     <para>
      In principle, both versions of <application>PL/Python</> can be used in
      the same database, though not in the same session (because the two
      versions of <application>libpython</> cannot safely be used concurrently).
      However, <application>pg_restore</> and <application>pg_upgrade</> both
      do things that can fall foul of the same-session restriction.  Work
      around that by changing the timing of the check.
     </para>
    </listitem>

<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: REL9_4_STABLE [f1b898759] 2015-11-14 13:43:43 -0500
Branch: REL9_3_STABLE [a37ab812c] 2015-11-14 13:44:09 -0500
Branch: REL9_2_STABLE [82076c1e4] 2015-11-14 13:53:26 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_5_STABLE [a66c1fcdd] 2016-01-08 11:39:28 -0500
-->

    <listitem>
     <para>
      Fix <application>PL/Python</> regression tests to pass with Python 3.5
      (Peter Eisentraut)
     </para>
    </listitem>

<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [f4aa3a18a] 2016-02-05 20:22:51 -0500
Branch: REL9_5_STABLE [0089dd34a] 2016-02-05 20:23:04 -0500
Branch: REL9_4_STABLE [ed6deeb7a] 2016-02-05 20:23:07 -0500
Branch: REL9_3_STABLE [34e91736b] 2016-02-05 20:23:11 -0500
Branch: REL9_2_STABLE [de9766d39] 2016-02-05 20:23:14 -0500
Branch: REL9_1_STABLE [b1f591c50] 2016-02-05 20:23:19 -0500
-->

    <listitem>
     <para>
      Prevent certain <application>PL/Java</> parameters from being set by
      non-superusers (Noah Misch)
     </para>

     <para>
      This change mitigates a <application>PL/Java</> security bug
      (CVE-2016-0766), which was fixed in <application>PL/Java</> by marking
      these parameters as superuser-only.  To fix the security hazard for
      sites that update <productname>PostgreSQL</> more frequently
      than <application>PL/Java</>, make the core code aware of them also.
     </para>
    </listitem>

<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [7a58d19b0] 2016-02-01 13:21:00 +0100
Branch: REL9_5_STABLE [40482e606] 2016-02-01 13:20:37 +0100
Branch: REL9_3_STABLE [0b55fef39] 2016-02-01 13:19:10 +0100
Branch: REL9_2_STABLE [d9ce5d201] 2016-02-01 13:19:34 +0100
Branch: REL9_1_STABLE [79782b407] 2016-02-01 13:19:43 +0100
Author: Andres Freund <andres@anarazel.de>
Branch: REL9_4_STABLE [33b26426e] 2016-02-08 11:10:14 +0100
-->

    <listitem>
     <para>
      Fix <application>ecpg</>-supplied header files to not contain comments
      continued from a preprocessor directive line onto the next line
      (Michael Meskes)
     </para>

     <para>
      Such a comment is rejected by <application>ecpg</>.  It's not yet clear
      whether <application>ecpg</> itself should be changed.
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e6ecc93a1] 2016-02-03 01:39:48 -0500
Branch: REL9_5_STABLE [1c291624b] 2016-02-03 01:39:08 -0500
Branch: REL9_4_STABLE [aa223a037] 2016-02-03 01:39:08 -0500
Branch: REL9_3_STABLE [1f2b195eb] 2016-02-03 01:39:08 -0500
-->

    <listitem>
     <para>
      Fix <function>hstore_to_json_loose()</>'s test for whether
      an <type>hstore</> value can be converted to a JSON number (Tom Lane)
     </para>

     <para>
      Previously this function could be fooled by non-alphanumeric trailing
      characters, leading to emitting syntactically-invalid JSON.
     </para>
    </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [9418d79a7] 2016-02-04 21:17:53 -0500
Branch: REL9_5_STABLE [453d40817] 2016-02-04 21:17:46 -0500
Branch: REL9_4_STABLE [1f3294c22] 2016-02-04 21:15:57 -0500
Branch: master [37c84570b] 2016-02-04 22:27:13 -0500
Branch: REL9_5_STABLE [d160e2a34] 2016-02-04 22:27:38 -0500
Branch: REL9_4_STABLE [2099b911d] 2016-02-04 22:27:47 -0500
-->

    <listitem>
     <para>
      In <filename>contrib/postgres_fdw</>, fix bugs triggered by use
      of <literal>tableoid</> in data-modifying commands (Etsuro Fujita,
      Robert Haas)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a396144ac] 2016-01-22 11:53:06 -0500
Branch: REL9_5_STABLE [47acf3add] 2016-01-22 11:53:06 -0500
-->

    <listitem>
     <para>
      Fix ill-advised restriction of <literal>NAMEDATALEN</> to be less
      than 256 (Robert Haas, Tom Lane)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3343ea9e8] 2016-01-05 15:47:05 -0500
Branch: REL9_5_STABLE [8805af088] 2016-01-05 15:47:05 -0500
Branch: REL9_4_STABLE [8c558b2e9] 2016-01-05 15:47:05 -0500
Branch: REL9_3_STABLE [6d899f098] 2016-01-05 15:47:05 -0500
-->

    <listitem>
     <para>
      Improve reproducibility of build output by ensuring filenames are given
      to the linker in a fixed order (Christoph Berg)
     </para>

     <para>
      This avoids possible bitwise differences in the produced executable
      files from one build to the next.
     </para>
    </listitem>

<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [216d56843] 2016-01-19 23:30:29 -0500
Branch: REL9_5_STABLE [34bda20ae] 2016-01-19 23:30:29 -0500
Branch: REL9_4_STABLE [8b3d52801] 2016-01-19 23:30:29 -0500
Branch: REL9_3_STABLE [7a47262ce] 2016-01-19 23:30:28 -0500
Branch: REL9_2_STABLE [49d65e857] 2016-01-19 23:30:28 -0500
Branch: REL9_1_STABLE [b1bc38144] 2016-01-19 23:30:28 -0500
-->

    <listitem>
     <para>
      Ensure that <filename>dynloader.h</> is included in the installed
      header files in MSVC builds (Bruce Momjian, Michael Paquier)
     </para>
    </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a73311e52] 2016-02-05 10:59:09 -0500
Branch: REL9_5_STABLE [37e694632] 2016-02-05 10:59:21 -0500
Branch: REL9_4_STABLE [31b792f61] 2016-02-05 10:59:26 -0500
Branch: REL9_3_STABLE [9a3475b84] 2016-02-05 10:59:31 -0500
Branch: REL9_2_STABLE [32f17a2e7] 2016-02-05 10:59:35 -0500
Branch: REL9_1_STABLE [6887d72d0] 2016-02-05 10:59:39 -0500
-->

    <listitem>
     <para>
      Update time zone data files to <application>tzdata</> release 2016a for
      DST law changes in Cayman Islands, Metlakatla, and Trans-Baikal
      Territory (Zabaykalsky Krai), plus historical corrections for Pakistan.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>
 </sect1>

 <sect1 id="release-9-5">
  <title>Release 9.5</title>

  <formalpara>
   <title>Release date:</title>
   <para>2016-01-07</para>
  </formalpara>

  <sect2>
   <title>Overview</title>

   <para>
    Major enhancements in <productname>PostgreSQL</> 9.5 include:
   </para>

   <!-- This list duplicates items below, but without authors or details-->

   <itemizedlist>

    <listitem>
     <para>
      Allow <link linkend="sql-on-conflict"><command>INSERT</></>s
      that would generate constraint conflicts to be turned into
      <command>UPDATE</>s or ignored
     </para>
    </listitem>

    <listitem>
     <para>
      Add <literal>GROUP BY</> analysis features <link
      linkend="queries-grouping-sets"><literal>GROUPING SETS</></>,
      <link linkend="queries-grouping-sets"><literal>CUBE</></> and
      <link linkend="queries-grouping-sets"><literal>ROLLUP</></>
     </para>
    </listitem>

    <listitem>
     <para>
      Add <link linkend="ddl-rowsecurity">row-level security control</>
     </para>
    </listitem>

    <listitem>
     <para>
      Create mechanisms for tracking
      the <link linkend="replication-origins">progress of replication</>,
      including methods for identifying the origin of individual changes
      during logical replication
     </para>
    </listitem>

    <listitem>
     <para>
      Add <link linkend="BRIN">Block Range Indexes</> (<acronym>BRIN</>)
     </para>
    </listitem>

    <listitem>
     <para>
      Substantial performance improvements for sorting
     </para>
    </listitem>

    <listitem>
     <para>
      Substantial performance improvements for multi-CPU machines
     </para>
    </listitem>

   </itemizedlist>

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

  </sect2>

  <sect2>

  <title>Migration to Version 9.5</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 9.5 contains a number of changes that may affect compatibility
    with previous releases.  Observe the following incompatibilities:
   </para>

   <itemizedlist>

    <listitem>
<!--
2015-03-11 [c6b3c93] Tom Lane: Make operator precedence follow the SQL standar..
-->
     <para>
      Adjust <link linkend="sql-precedence">operator precedence</>
      to match the <acronym>SQL</> standard (Tom Lane)
     </para>

     <para>
      The precedence of <literal>&lt;=</literal>, <literal>&gt;=</literal>
      and <literal>&lt;&gt;</literal> has been reduced to match that of
      <literal>&lt;</literal>, <literal>&gt;</literal>
      and <literal>=</literal>.  The precedence of <literal>IS</> tests
      (e.g., <replaceable>x</> <literal>IS NULL</>) has been reduced to be
      just below these six comparison operators.
      Also, multi-keyword operators beginning with <literal>NOT</> now have
      the precedence of their base operator (for example, <literal>NOT
      BETWEEN</> now has the same precedence as <literal>BETWEEN</>) whereas
      before they had inconsistent precedence, behaving like <literal>NOT</>
      with respect to their left operand but like their base operator with
      respect to their right operand.  The new configuration
      parameter <xref linkend="guc-operator-precedence-warning"> can be
      enabled to warn about queries in which these precedence changes result
      in different parsing choices.
     </para>
    </listitem>

    <listitem>
<!--
2015-03-31 [0badb06] Bruce ..: pg_ctl:  change default shutdown mode from 'sma..
-->
     <para>
      Change <xref linkend="app-pg-ctl">'s default shutdown mode from
      <literal>smart</> to <literal>fast</> (Bruce Momjian)
     </para>

     <para>
      This means the default behavior will be to forcibly cancel existing
      database sessions, not simply wait for them to exit.
     </para>
    </listitem>

    <listitem>
<!--
2015-03-04 [1345cc6] Tom Lane: Use standard casting mechanism to convert type..
-->
     <para>
      Use assignment cast behavior for data type conversions
      in <application>PL/pgSQL</> assignments, rather than converting to and
      from text (Tom Lane)
     </para>

     <para>
      This change causes conversions of Booleans to strings to
      produce <literal>true</> or <literal>false</>, not <literal>t</>
      or <literal>f</>.  Other type conversions may succeed in more cases
      than before; for example, assigning a numeric value <literal>3.9</> to
      an integer variable will now assign 4 rather than failing.  If no
      assignment-grade cast is defined for the particular source and
      destination types, <application>PL/pgSQL</> will fall back to its old
      I/O conversion behavior.
     </para>
    </listitem>

    <listitem>
<!--
2014-08-28 [11a020e] Andres..: Allow escaping of option values for options pas..
-->
     <para>
      Allow characters in <link linkend="libpq-connect-options">server
      command-line options</> to be escaped with a backslash (Andres Freund)
     </para>

     <para>
      Formerly, spaces in the options string always separated options, so
      there was no way to include a space in an option value.  Including
      a backslash in an option value now requires writing <literal>\\</>.
     </para>
    </listitem>

    <listitem>
<!--
2015-05-08 [9a08841] Stephe..: Change default for include_realm to 1
-->
     <para>
      Change the default value of the GSSAPI <link
      linkend="gssapi-auth"><varname>include_realm</></> parameter to 1, so
      that by default the realm is not removed from a <acronym>GSS</>
      or <acronym>SSPI</> principal name (Stephen Frost)
     </para>
    </listitem>

    <listitem>
<!--
2015-02-23 [88e9823] Heikki..: Replace checkpoint_segments with min_wal_size a..
2015-03-15 [a0f5954] Andres..: Increase max_wal_size's default from 128MB to 1..
2015-06-29 [d661532] Heikki..: Also trigger restartpoints based on max_wal_siz..
-->
     <para>
      Replace configuration parameter <varname>checkpoint_segments</>
      with <xref linkend="guc-min-wal-size">
      and <xref linkend="guc-max-wal-size"> (Heikki Linnakangas)
     </para>

     <para>
      If you previously adjusted <varname>checkpoint_segments</varname>, the
      following formula will give you an approximately equivalent setting:
<programlisting>
max_wal_size = (3 * checkpoint_segments) * 16MB
</programlisting>
      Note that the default setting for <varname>max_wal_size</varname> is
      much higher than the default <varname>checkpoint_segments</varname> used
      to be, so adjusting it might no longer be necessary.
     </para>
    </listitem>

      <listitem>
<!--
2014-06-18 [df8b7bc] Tom Lane: Improve our mechanism for controlling the Linux..
-->
       <para>
        Control the Linux <acronym>OOM</> killer via new environment
        variables <link
        linkend="linux-memory-overcommit"><envar>PG_OOM_ADJUST_FILE</></>
        and <link
        linkend="linux-memory-overcommit"><envar>PG_OOM_ADJUST_VALUE</></>,
        instead of compile-time options <literal>LINUX_OOM_SCORE_ADJ</> and
        <literal>LINUX_OOM_ADJ</>
        (Gurjeet Singh)
       </para>
      </listitem>

    <listitem>
<!--
2015-10-20 [b06f1f2] Robert..: Put back ssl_renegotiation_limit parameter, bu..
2015-07-28 [6087d95] Andres..: Remove ssl renegotiation support.
-->
     <para>
      Decommission server configuration
      parameter <varname>ssl_renegotiation_limit</>, which was deprecated
      in earlier releases (Andres Freund)
     </para>

     <para>
      While SSL renegotiation is a good idea in theory, it has caused enough
      bugs to be considered a net negative in practice, and it is due to be
      removed from future versions of the relevant standards.  We have
      therefore removed support for it from <productname>PostgreSQL</>.
      The <varname>ssl_renegotiation_limit</> parameter still exists, but
      cannot be set to anything but zero (disabled).  It's not documented
      anymore, either.
     </para>
    </listitem>

    <listitem>
<!--
2014-11-05 [525a489] Tom Lane: Remove the last vestige of server-side autocomm..
-->
     <para>
      Remove server configuration parameter <varname>autocommit</>, which
      was already deprecated and non-operational (Tom Lane)
     </para>
    </listitem>

    <listitem>
<!--
2015-03-06 [bb8582a] Peter ..: Remove rolcatupdate
-->
     <para>
      Remove the <link linkend="catalog-pg-authid"><structname>pg_authid</></>
      catalog's <structfield>rolcatupdate</> field, as it had no usefulness
      (Adam Brightwell)
     </para>
    </listitem>

    <listitem>
<!--
2015-12-13 [28c3667] Magnus..: Consistently set all fields in pg_stat_replica..
-->
     <para>
      The <link
      linkend="monitoring-stats-views-table"><structname>pg_stat_replication</></link>
      system view's <structfield>sent</> field is now NULL, not zero, when
      it has no valid value (Magnus Hagander)
     </para>
    </listitem>

    <listitem>
<!--
2015-07-17 [89ddd29] Andrew..: Support JSON negative array subscripts everywh..
-->
     <para>
      Allow <type>json</> and <type>jsonb</> array extraction operators to
      accept negative subscripts, which count from the end of JSON arrays
      (Peter Geoghegan, Andrew Dunstan)
     </para>

     <para>
      Previously, these operators returned <literal>NULL</> for negative
      subscripts.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>

  <sect2>
   <title>Changes</title>

   <para>
    Below you will find a detailed account of the changes between
    <productname>PostgreSQL</productname> 9.5 and the previous major
    release.
   </para>

   <sect3>
    <title>Server</title>

    <sect4>
     <title>Indexes</title>

     <itemizedlist>

      <listitem>
<!--
2014-11-07 [7516f52] Alvaro..: BRIN: Block Range Indexes
2015-05-05 [3b6db1f] Alvaro..: Add geometry/range functions to support BRIN in..
2015-05-15 [b0b7be6] Alvaro..: Add BRIN infrastructure for "inclusion" opclasses
-->
       <para>
        Add <link linkend="BRIN">Block Range Indexes</> (<acronym>BRIN</>)
        (&Aacute;lvaro Herrera)
       </para>

       <para>
        <acronym>BRIN</> indexes store only summary data (such as minimum
        and maximum values) for ranges of heap blocks.  They are therefore
        very compact and cheap to update; but if the data is naturally
        clustered, they can still provide substantial speedup of searches.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-15 [35fcb1b] Heikki..: Allow GiST distance function to return merely ..
-->
       <para>
        Allow queries to perform accurate distance filtering of
        bounding-box-indexed objects (polygons, circles) using <link
        linkend="GiST">GiST</> indexes (Alexander Korotkov, Heikki
        Linnakangas)
       </para>

       <para>
        Previously, to exploit such an index a subquery had to be used to
        select a large number of rows ordered by bounding-box distance, and
        the result then had to be filtered further with a more accurate
        distance calculation.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-26 [d04c8ed] Heikki..: Add support for index-only scans in GiST.
2015-03-27 [e09b483] Heikki..: Add index-only scan support to btree_gist.
2015-03-28 [3a20b0e] Heikki..: Add index-only scan support to inet GiST opclass.
2015-03-30 [0633a60] Heikki..: Add index-only scan support to range type GiST ..
-->
       <para>
        Allow <link linkend="GiST">GiST</> indexes to perform index-only
        scans (Anastasia Lubennikova, Heikki Linnakangas, Andreas Karlsson)
       </para>
      </listitem>

      <listitem>
<!--
Add GUC and storage parameter to set the maximum size of GIN pending list.
-->
       <para>
        Add configuration parameter <xref linkend="guc-gin-pending-list-limit">
        to control the size of <acronym>GIN</> pending lists (Fujii Masao)
       </para>

       <para>
        This value can also be set on a per-index basis as an index storage
        parameter.  Previously the pending-list size was controlled
        by <xref linkend="guc-work-mem">, which was awkward because
        appropriate values for <varname>work_mem</> are often much too large
        for this purpose.
       </para>
      </listitem>

      <listitem>
<!--
2014-09-10 [84aa8ba] Bruce ..: Issue a warning during the creation of hash in..
-->
       <para>
        Issue a warning during the creation of <link
        linkend="indexes-types">hash</> indexes because they are not
        crash-safe (Bruce Momjian)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

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

     <itemizedlist>

      <listitem>
<!--
2015-01-19 [4ea51cd] Robert..: Use abbreviated keys for faster sorting of text..
2014-09-19 [e246b3d] Robert..: Add a fast pre-check for equality of equal-leng..
2015-05-13 [78efd5c] Robert..: Extend abbreviated key infrastructure to datum ..
-->
       <para>
        Improve the speed of sorting of <type>varchar</>, <type>text</>,
        and <type>numeric</> fields via <quote>abbreviated</> keys
        (Peter Geoghegan, Andrew Gierth, Robert Haas)
       </para>
      </listitem>

      <listitem>
<!--
2014-11-07 [5ea86e6] Robert..: Use the sortsupport infrastructure in more cas..
-->
       <para>
        Extend the infrastructure that allows sorting to be performed by
        inlined, non-<acronym>SQL</acronym>-callable comparison functions to
        cover <command>CREATE INDEX</>, <command>REINDEX</>, and
        <command>CLUSTER</> (Peter Geoghegan)
       </para>
      </listitem>

      <listitem>
<!--
2014-09-10 [45f6240] Heikki..: Pack tuples in a hash join batch densely, to sa..
2014-09-12 [8cce08f] Robert..: Change NTUP_PER_BUCKET to 1 to improve hash joi..
2014-10-13 [30d7ae3] Kevin ..: Increase number of hash join buckets for undere..
-->
       <para>
        Improve performance of hash joins (Tomas Vondra, Robert Haas)
       </para>
      </listitem>

      <listitem>
<!--
2014-09-25 [5d7962c] Robert..: Change locking regimen around buffer replacement.
2014-12-25 [d72731a] Andres..: Lockless StrategyGetBuffer clock sweep hot path.
-->
       <para>
        Improve concurrency of shared buffer replacement
        (Robert Haas, Amit Kapila, Andres Freund)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-25 [2ed5b87f] Kevin ..: Reduce pinning and buffer content locking for b..
-->
       <para>
        Reduce the number of page locks and pins during index scans (Kevin Grittner)
       </para>

       <para>
        The primary benefit of this is to allow index vacuums to be blocked
        less often.
       </para>
      </listitem>

      <listitem>
<!--
2014-08-30 [4b4b680] Andres..: Make backend local tracking of buffer pins memo..
2015-01-19 [2d115e4] Andres..: Fix various shortcomings of the new PrivateRefC..
-->
       <para>
        Make per-backend tracking of buffer pins more memory-efficient
        (Andres Freund)
       </para>
      </listitem>

      <listitem>
<!--
2014-12-25 [ab5194e] Andres..: Improve LWLock scalability.
-->
       <para>
        Improve lock scalability (Andres Freund)
       </para>

       <para>
        This particularly addresses scalability problems when running on
        systems with multiple <acronym>CPU</> sockets.
       </para>
      </listitem>

      <listitem>
<!--
2014-07-15 [f15821e] Tom Lane: Allow join removal in some cases involving a le..
-->
       <para>
        Allow the optimizer to remove unnecessary references to left-joined
        subqueries (David Rowley)
       </para>
      </listitem>

      <listitem>
<!--
2014-06-27 [d222585] Tom Lane: Allow pushdown of WHERE quals into subqueries w..
-->
       <para>
        Allow pushdown of query restrictions into subqueries with <link
        linkend="tutorial-window">window functions</>, where appropriate
        (David Rowley)
       </para>
      </listitem>

      <listitem>
<!--
2015-04-27 [dcbf594]  Stephe..: Improve qual pushdown for RLS and SB views
-->
       <para>
        Allow a non-leakproof function to be pushed down into a security
        barrier view if the function does not receive any view output
        columns (Dean Rasheed)
       </para>
      </listitem>

      <listitem>
<!--
2015-09-24 [45d256c] Tom Lane: Allow planner to use expression-index stats fo..
-->
       <para>
        Teach the planner to use statistics obtained from an expression
        index on a boolean-returning function, when a matching function call
        appears in <literal>WHERE</> (Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
2015-09-23 [cfb2024] Tom Lane: Make ANALYZE compute basic statistics even for..
-->
       <para>
        Make <command>ANALYZE</> compute basic statistics (null fraction and
        average column width) even for columns whose data type lacks an
        equality function (Oleksandr Shulgin)
       </para>
      </listitem>

      <listitem>
<!--
2014-11-04 [5028f22] Heikki..: Switch to CRC-32C in WAL and other places.
2015-02-10 [025c024] Heikki..: Speed up CRC calculation using slicing-by-8 alg..
2015-04-14 [3dc2d62] Heikki..: Use Intel SSE 4.2 CRC instructions where availa..

-->
       <para>
        Speed up <acronym>CRC</> (cyclic redundancy check) computations
        and switch to CRC-32C (Abhijit Menon-Sen, Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
2015-01-16 [f5ae3ba] Andres..: Make tbm_add_tuples more efficient by caching t..
2015-01-16 [779fdcd] Tom Lane: Improve new caching logic in tbm_add_tuples().
-->
       <para>
        Improve bitmap index scan performance (Teodor Sigaev, Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
2014-07-01 [9f03ca9] Robert..: Avoid copying index tuples when building an ind..
-->
       <para>
        Speed up <command>CREATE INDEX</> by avoiding unnecessary memory
        copies (Robert Haas)
       </para>
      </listitem>

      <listitem>
<!--
2014-10-02 [3acc10c9] Robert..: Increase the number of buffer mapping partitio..
-->
       <para>
        Increase the number of buffer mapping partitions (Amit Kapila,
        Andres Freund, Robert Haas)
       </para>

       <para>
        This improves performance for highly concurrent workloads.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Monitoring</title>

     <itemizedlist>

      <listitem>
<!--
2015-04-03 [4ff695b1] Alvaro..: Add log_min_autovacuum_duration per-table option
-->
       <para>
        Add per-table autovacuum logging control via new
        <varname>log_autovacuum_min_duration</> storage parameter
        (Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2014-06-29 [51adcaa] Andres..: Add cluster_name GUC which is included in proce..
-->
       <para>
        Add new configuration parameter <xref linkend="guc-cluster-name">
        (Thomas Munro)
       </para>

       <para>
        This string, typically set in <link
        linkend="config-setting-configuration-file"><filename>postgresql.conf</></>,
        allows clients to identify the cluster.  This name also appears
        in the process title of all server processes, allowing for easier
        identification of processes belonging to the same cluster.
       </para>
      </listitem>

      <listitem>
<!--
2014-09-13 [fe550b2] Tom Lane: Invent PGC_SU_BACKEND and mark log_connections..
-->
       <para>
        Prevent non-superusers from changing <xref
        linkend="guc-log-disconnections"> on connection startup (Fujii Masao)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title><acronym>SSL</></title>

     <itemizedlist>

      <listitem>
<!--
2014-09-12 [acd08d7] Heikki..: Support Subject Alternative Names in SSL server..
-->
       <para>
        Check <link linkend="libpq-ssl"><quote>Subject Alternative
        Names</></> in <acronym>SSL</> server certificates, if present
        (Alexey Klyukin)
       </para>

       <para>
        When they are present, this replaces checks against the certificate's
        <quote>Common Name</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-04-12 [9029f4b] Magnus..: Add system view pg_stat_ssl
-->
       <para>
        Add system view <link
        linkend="pg-stat-ssl-view"><structname>pg_stat_ssl</></> to report
        <acronym>SSL</> connection information (Magnus Hagander)
       </para>
      </listitem>

      <listitem>
<!--
2015-02-03 [91fa7b4] Heikki..: Add API functions to libpq to interrogate SSL ..
-->
       <para>
        Add <application>libpq</> functions to return <acronym>SSL</>
        information in an implementation-independent way (Heikki Linnakangas)
       </para>

       <para>
        While <link linkend="libpq-pqgetssl"><function>PQgetssl()</></> can
        still be used to call <productname>OpenSSL</> functions, it is now
        considered deprecated because future versions
        of <application>libpq</> might support other <acronym>SSL</>
        implementations.  When possible, use the new
        functions <link
        linkend="libpq-pqsslattribute"><function>PQsslAttribute()</></>, <link
        linkend="libpq-pqsslattributenames"><function>PQsslAttributeNames()</></>,
        and <link linkend="libpq-pqsslinuse"><function>PQsslInUse()</></>
        to obtain <acronym>SSL</> information in
        an <acronym>SSL</>-implementation-independent way.
       </para>
      </listitem>

      <listitem>
<!--
2015-04-09 [8a0d34e4] Peter ..: libpq: Don't overwrite existing OpenSSL thread..
-->
       <para>
        Make <application>libpq</> honor any <productname>OpenSSL</>
        thread callbacks (Jan Urbanski)
       </para>

       <para>
        Previously they were overwritten.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4>
     <title>Server Settings</title>

     <itemizedlist>

      <listitem>
<!--
2015-02-23 [88e9823] Heikki..: Replace checkpoint_segments with min_wal_size a..
2015-03-15 [a0f5954] Andres..: Increase max_wal_size's default from 128MB to 1..
2015-06-29 [d661532] Heikki..: Also trigger restartpoints based on max_wal_siz..
-->
       <para>
        Replace configuration parameter <varname>checkpoint_segments</>
        with <xref linkend="guc-min-wal-size">
        and <xref linkend="guc-max-wal-size"> (Heikki Linnakangas)
       </para>

       <para>
        This change allows the allocation of a large number of <acronym>WAL</>
        files without keeping them after they are no longer needed.
        Therefore the default for <varname>max_wal_size</> has been set
        to <literal>1GB</>, much larger than the old default
        for <varname>checkpoint_segments</>.
        Also note that standby servers perform restartpoints to try to limit
        their WAL space consumption to <varname>max_wal_size</>; previously
        they did not pay any attention to <varname>checkpoint_segments</>.
       </para>
      </listitem>

      <listitem>
<!--
2014-06-18 [df8b7bc] Tom Lane: Improve our mechanism for controlling the Linux..
-->
       <para>
        Control the Linux <acronym>OOM</> killer via new environment
        variables <link
        linkend="linux-memory-overcommit"><envar>PG_OOM_ADJUST_FILE</></>
        and <link
        linkend="linux-memory-overcommit"><envar>PG_OOM_ADJUST_VALUE</></>
        (Gurjeet Singh)
       </para>

       <para>
        The previous <acronym>OOM</> control infrastructure involved
        compile-time options <literal>LINUX_OOM_SCORE_ADJ</> and
        <literal>LINUX_OOM_ADJ</>, which are no longer supported.
        The new behavior is available in all builds.
       </para>
      </listitem>

      <listitem>
<!--
2014-12-03 [73c986a] Alvaro..: Keep track of transaction commit timestamps
-->
       <para>
        Allow recording of transaction
        commit time stamps when configuration parameter <xref
        linkend="guc-track-commit-timestamp">
        is enabled (&Aacute;lvaro Herrera, Petr Jel&iacute;nek)
       </para>

       <para>
        Time stamp information can be accessed using functions <link
        linkend="functions-commit-timestamp"><function>pg_xact_commit_timestamp()</></>
        and <function>pg_last_committed_xact()</>.
       </para>
      </listitem>

      <listitem>
<!--
2014-12-22 [584e35d] Peter ..: Change local_preload_libraries to PGC_USERSET
-->
       <para>
        Allow <xref linkend="guc-local-preload-libraries"> to be set
        by <command>ALTER ROLE SET</> (Peter Eisentraut, Kyotaro Horiguchi)
       </para>
      </listitem>

      <listitem>
<!--
2015-04-03 [a75fb9b] Alvaro..: Have autovacuum workers listen to SIGHUP, too
-->
       <para>
        Allow <link linkend="autovacuum">autovacuum workers</>
        to respond to configuration parameter changes during a run
        (Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2014-06-20 [3bdcf6a] Andres..: Don't allow to disable backend assertions via t..
-->
       <para>
        Make configuration parameter <xref linkend="guc-debug-assertions">
        read-only (Andres Freund)
       </para>

       <para>
        This means that assertions can no longer be turned
        off if they were enabled at compile time, allowing for more
        efficient code optimization.  This change also removes the <link
        linkend="app-postgres-options">postgres</> <option>-A</> option.
       </para>
      </listitem>

      <listitem>
<!--
2014-10-18 [7feaccc] Peter ..: Allow setting effective_io_concurrency even on..
-->
       <para>
        Allow setting <xref linkend="guc-effective-io-concurrency"> on
        systems where it has no effect (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
2015-05-08 [a97e0c3] Stephe..: Add pg_file_settings view and function
2015-06-28 [62d16c7] Tom Lane: Improve design and implementation of pg_file_se..
-->
       <para>
        Add system view <link
        linkend="view-pg-file-settings"><structname>pg_file_settings</></>
        to show the contents of the server's configuration files
        (Sawada Masahiko)
       </para>
      </listitem>

      <listitem>
<!--
2015-05-14 [a486e35] Peter ..: Add pg_settings.pending_restart column
-->
       <para>
        Add <structname>pending_restart</> to the system view <link
        linkend="view-pg-settings"><structname>pg_settings</></> to
        indicate a change has been made but will not take effect until a
        database restart (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
2014-09-02 [bd3b7a9] Fujii ..: Support ALTER SYSTEM RESET command.
-->
       <para>
        Allow <link linkend="SQL-ALTERSYSTEM"><command>ALTER SYSTEM</></>
        values to be reset with <command>ALTER SYSTEM RESET</> (Vik
        Fearing)
       </para>

       <para>
        This command removes the specified setting
        from <filename>postgresql.auto.conf</>.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

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

     <itemizedlist>

      <listitem>
<!--
2015-04-29 [5aa2350] Andres..: Introduce replication progress tracking infrast..
-->
       <para>
        Create mechanisms for tracking
        the <link linkend="replication-origins">progress of replication</>,
        including methods for identifying the origin of individual changes
        during logical replication (Andres Freund)
       </para>

       <para>
        This is helpful when implementing replication solutions.
       </para>
      </listitem>

      <listitem>
<!--
2015-09-26 [bd7c348] Andres..: Rework the way multixact truncations work.
2015-09-26 [6e8af37] Andres..: Remove legacy multixact truncation support.
-->
       <para>
        Rework truncation of the multixact commit log to be properly
        WAL-logged (Andres Freund)
       </para>

       <para>
        This makes things substantially simpler and more robust.
       </para>
      </listitem>

      <listitem>
<!--
2014-11-25 [aedccb1] Simon ..: action_at_recovery_target recovery config option
2014-12-07 [b8e33a8] Simon ..: Tweaks for recovery_target_action
2015-03-15 [51c11a7] Andres..: Remove pause_at_recovery_target recovery.conf s..
-->
       <para>
        Add <link linkend="recovery-config"><filename>recovery.conf</></>
        parameter <link
        linkend="recovery-target-action"><varname>recovery_target_action</></>
        to control post-recovery activity (Petr Jel&iacute;nek)
       </para>

       <para>
        This replaces the old parameter <varname>pause_at_recovery_target</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-15 [ffd3774] Heikki..: Add archive_mode='always' option.
-->
       <para>
        Add new <xref linkend="guc-archive-mode"> value
        <literal>always</> to allow standbys to always archive received
        <acronym>WAL</> files (Fujii Masao)
       </para>
      </listitem>

      <listitem>
<!--
2015-02-23 [5d2b45e] Fujii ..: Add GUC to control the time to wait before retr..
-->
       <para>
        Add configuration
        parameter <xref linkend="guc-wal-retrieve-retry-interval"> to
        control <acronym>WAL</> read retry after failure
        (Alexey Vasiliev, Michael Paquier)
       </para>

       <para>
        This is particularly helpful for warm standbys.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-11 [57aa5b2] Fujii ..: Add GUC to enable compression of full page imag..
-->
       <para>
        Allow compression of full-page images stored in <acronym>WAL</>
        (Rahila Syed, Michael Paquier)
       </para>

       <para>
        This feature reduces WAL volume, at the cost of more CPU time spent
        on WAL logging and WAL replay.  It is controlled by a new
        configuration parameter <xref linkend="guc-wal-compression">, which
        currently is off by default.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-08 [de76884] Heikki..: At promotion, archive last segment from old tim..
-->
       <para>
        Archive <acronym>WAL</> files with suffix <literal>.partial</>
        during standby promotion (Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
2014-09-13 [4ad2a54] Fujii ..: Add GUC to enable logging of replication comman..
-->
       <para>
        Add configuration parameter <xref
        linkend="guc-log-replication-commands">
        to log replication commands (Fujii Masao)
       </para>

       <para>
        By default, replication commands, e.g. <link
        linkend="protocol-replication"><literal>IDENTIFY_SYSTEM</></>,
        are not logged, even when <xref linkend="guc-log-statement"> is set
        to <literal>all</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-04-21 [d811c03] Andres..: Add 'active_in' column to pg_replication_slots.
-->
       <para>
        Report the processes holding replication slots in <link
        linkend="view-pg-replication-slots"><structname>pg_replication_slots</></>
        (Craig Ringer)
       </para>

       <para>
        The new output column is <structname>active_pid</>.
       </para>
      </listitem>

      <listitem>
<!--
2014-11-25 [b3fc672] Heikki..: Allow using connection URI in primary_conninfo.
-->
       <para>
        Allow <filename>recovery.conf</>'s <link
        linkend="primary-conninfo"><varname>primary_conninfo</></> setting to
        use connection <acronym>URI</>s, e.g. <literal>postgres://</>
        (Alexander Shulgin)
       </para>
      </listitem>

     </itemizedlist>

   </sect3>

   <sect3>
    <title>Queries</title>

     <itemizedlist>

      <listitem>
<!--
2015-05-08 [168d580] Andres..: Add support for INSERT ... ON CONFLICT DO NOTHI..
2015-05-08 [2c8f483] Andres..: Represent columns requiring insert and update p..
-->
       <para>
        Allow <link linkend="sql-on-conflict"><command>INSERT</></>s
        that would generate constraint conflicts to be turned into
        <command>UPDATE</>s or ignored (Peter Geoghegan, Heikki
        Linnakangas, Andres Freund)
       </para>

       <para>
        The syntax is <command>INSERT ... ON CONFLICT DO NOTHING/UPDATE</>.
        This is the Postgres implementation of the popular
        <command>UPSERT</> command.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-16 [f3d3118] Andres..: Support GROUPING SETS, CUBE and ROLLUP.
-->
       <para>
        Add <literal>GROUP BY</> analysis features <link
        linkend="queries-grouping-sets"><literal>GROUPING SETS</></>,
        <link linkend="queries-grouping-sets"><literal>CUBE</></> and
        <link linkend="queries-grouping-sets"><literal>ROLLUP</></>
        (Andrew Gierth, Atri Sharma)
       </para>
      </listitem>

      <listitem>
<!--
2014-06-18 [8f889b1] Tom Lane: Implement UPDATE tab SET (col1,col2,...) = (SEL..
-->
       <para>
        Allow setting multiple target columns in
        an <link linkend="SQL-UPDATE"><command>UPDATE</></> from the result of
        a single sub-SELECT (Tom Lane)
       </para>

       <para>
        This is accomplished using the syntax <command>UPDATE tab SET
        (col1, col2, ...) = (SELECT ...)</>.
       </para>
      </listitem>

      <listitem>
<!--
2014-10-07 [df630b0] Alvaro..: Implement SKIP LOCKED for row-level locks
-->
       <para>
        Add <link linkend="SQL-SELECT"><command>SELECT</></> option
        <literal>SKIP LOCKED</> to skip locked rows (Thomas Munro)
       </para>

       <para>
        This does not throw an error for locked rows like
        <literal>NOWAIT</> does.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-15 [f6d208d] Simon ..: TABLESAMPLE, SQL Standard and extensible
-->
       <para>
        Add <link linkend="SQL-SELECT"><command>SELECT</></> option
        <literal>TABLESAMPLE</> to return a subset of a table (Petr
        Jel&iacute;nek)
       </para>

       <para>
        This feature supports the SQL-standard table sampling methods.
        In addition, there are provisions
        for <link linkend="tablesample-method">user-defined
        table sampling methods</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-11 [e529cd4] Robert..: Suggest to the user the column they may have m..
-->
       <para>
        Suggest possible matches for mistyped column names (Peter
        Geoghegan, Robert Haas)
       </para>
      </listitem>

     </itemizedlist>

   </sect3>

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

     <itemizedlist>

      <listitem>
<!--
2015-01-16 [20af53d] Tom Lane: Show sort ordering options in EXPLAIN output.
-->
       <para>
        Add more details about sort ordering in <link
        linkend="SQL-EXPLAIN"><command>EXPLAIN</></> output (Marius Timmer,
        Lukas Kreft, Arne Scheffer)
       </para>

       <para>
        Details include <literal>COLLATE</>, <literal>DESC</>,
        <literal>USING</>, and <literal>NULLS FIRST</><literal>/LAST</>.
       </para>
      </listitem>

      <listitem>
<!--
2014-12-18 [35192f0] Alvaro..: Have VACUUM log number of skipped pages due to ..
-->
       <para>
        Make <link linkend="SQL-VACUUM"><command>VACUUM</></> log the
        number of pages skipped due to pins (Jim Nasby)
       </para>
      </listitem>

      <listitem>
<!--
2015-02-20 [d42358e] Alvaro..: Have TRUNCATE update pgstat tuple counters
-->
       <para>
        Make <link linkend="SQL-TRUNCATE"><command>TRUNCATE</></> properly
        update the <literal>pg_stat</>* tuple counters (Alexander Shulgin)
       </para>
      </listitem>

       </itemizedlist>

       <sect4>
        <title><xref linkend="SQL-REINDEX"></title>

        <itemizedlist>

      <listitem>
<!--
2014-12-09 [fe263d1] Simon ..: REINDEX SCHEMA
-->
       <para>
        Allow <command>REINDEX</> to reindex an entire schema using the
        <literal>SCHEMA</> option (Sawada Masahiko)
       </para>
      </listitem>

      <listitem>
<!--
2015-05-15 [ecd222e] Fujii ..: Support VERBOSE option in REINDEX command.
-->
       <para>
        Add <literal>VERBOSE</> option to <command>REINDEX</> (Sawada
        Masahiko)
       </para>
      </listitem>

      <listitem>
<!--
2014-12-09 [ae4e688] Simon ..: Silence REINDEX
-->
       <para>
        Prevent <command>REINDEX DATABASE</> and <command>SCHEMA</>
        from outputting object names, unless <literal>VERBOSE</> is used
        (Simon Riggs)
       </para>
      </listitem>

      <listitem>
<!--
2015-04-09 [17d436d] Fujii ..: Remove obsolete FORCE option from REINDEX.
-->
       <para>
        Remove obsolete <literal>FORCE</> option from <command>REINDEX</>
        (Fujii Masao)
       </para>
      </listitem>

      </itemizedlist>

     </sect4>
   </sect3>

   <sect3>
    <title>Object Manipulation</title>

     <itemizedlist>

      <listitem>
<!--
2014-09-19 [491c029] Stephe..: Row-Level Security Policies (RLS)
-->
       <para>
        Add  <link linkend="ddl-rowsecurity">row-level security control</>
        (Craig Ringer, KaiGai Kohei, Adam Brightwell, Dean Rasheed,
        Stephen Frost)
       </para>

       <para>
        This feature allows row-by-row control over which users can add,
        modify, or even see rows in a table.  This is controlled by new
        commands <link linkend="SQL-CREATEPOLICY"><command>CREATE</></>/<link
        linkend="SQL-ALTERPOLICY"><command>ALTER</></>/<link
        linkend="SQL-DROPPOLICY"><command>DROP POLICY</></> and <link
        linkend="SQL-ALTERTABLE"><command>ALTER TABLE ... ENABLE/DISABLE
        ROW SECURITY</></>.
       </para>
      </listitem>

      <listitem>
<!--
2014-08-22 [f41872d] Alvaro..: Implement ALTER TABLE .. SET LOGGED / UNLOGGED
-->
       <para>
        Allow changing of the <acronym>WAL</acronym>
        logging status of a table after creation with <link
        linkend="SQL-ALTERTABLE"><command>ALTER TABLE ... SET LOGGED /
        UNLOGGED</></> (Fabr&iacute;zio de Royes Mello)
       </para>
      </listitem>

      <listitem>
<!--
2014-08-26 [0076f26] Heikki..: Implement IF NOT EXISTS for CREATE SEQUENCE.
2014-11-06 [08309aa] Fujii ..: Implement IF NOT EXIST for CREATE INDEX.
2014-12-13 [e39b6f9] Andrew..: Add CINE option for CREATE TABLE AS and CREATE ..
-->
       <para>
        Add <literal>IF NOT EXISTS</> clause to <link
        linkend="SQL-CREATETABLEAS"><command>CREATE TABLE AS</></>,
        <link linkend="SQL-CREATEINDEX"><command>CREATE INDEX</></>,
        <link linkend="SQL-CREATESEQUENCE"><command>CREATE SEQUENCE</></>,
        and <link linkend="SQL-CREATEMATERIALIZEDVIEW"><command>CREATE
        MATERIALIZED VIEW</></> (Fabr&iacute;zio de Royes Mello)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-24 [1d8198b] Bruce ..: Add support for ALTER TABLE IF EXISTS ... RENAM..
-->
       <para>
        Add support for <literal>IF EXISTS</> to <link
        linkend="SQL-ALTERTABLE"><command>ALTER TABLE ... RENAME
        CONSTRAINT</></> (Bruce Momjian)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-09 [31eae60] Alvaro..: Allow CURRENT/SESSION_USER to be used in certai..
-->
       <para>
        Allow some DDL commands to accept <literal>CURRENT_USER</>
        or <literal>SESSION_USER</>, meaning the current user or session
        user, in place of a specific user name (Kyotaro Horiguchi,
        &Aacute;lvaro Herrera)
       </para>

       <para>
        This feature is now supported in
        <xref linkend="SQL-ALTERUSER">, <xref linkend="SQL-ALTERGROUP">,
        <xref linkend="SQL-ALTERROLE">, <xref linkend="SQL-GRANT">,
        and <command>ALTER <replaceable>object</> OWNER TO</> commands.
       </para>
      </listitem>

      <listitem>
<!--
2014-12-23 [7eca575] Alvaro..: get_object_address: separate domain constraints..
-->
       <para>
        Support comments on <link linkend="SQL-CREATEDOMAIN">domain
        constraints</> (&Aacute;lvaro Herrera)
       </para>
      </listitem>

      <listitem>
<!--
2015-04-05 [0ef0396] Simon ..: Reduce lock levels of some trigger DDL and add ..
-->
       <para>
        Reduce lock levels of some create and alter trigger and foreign
        key commands (Simon Riggs, Andreas Karlsson)
       </para>
      </listitem>

      <listitem>
<!--
2015-05-11 [fa26424] Stephe..: Allow LOCK TABLE .. ROW EXCLUSIVE MODE with IN..
-->
       <para>
        Allow <link linkend="SQL-LOCK"><command>LOCK TABLE ... ROW EXCLUSIVE
        MODE</></> for those with <command>INSERT</> privileges on the
        target table (Stephen Frost)
       </para>

       <para>
        Previously this command required <command>UPDATE</>, <command>DELETE</>,
        or <command>TRUNCATE</> privileges.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-23 [e5f455f] Tom Lane: Apply table and domain CHECK constraints in nam.
-->
       <para>
        Apply table and domain <literal>CHECK</> constraints in order by name
        (Tom Lane)
       </para>

       <para>
        The previous ordering was indeterminate.
       </para>
      </listitem>

      <listitem>
<!--
2014-07-01 [15c82ef] Tom Lane: Refactor CREATE/ALTER DATABASE syntax so option..
2014-07-01 [fbb1d7d] Tom Lane: Allow CREATE/ALTER DATABASE to manipulate datis..
-->
       <para>
        Allow <link
        linkend="SQL-CREATEDATABASE"><command>CREATE</></>/<link
        linkend="SQL-ALTERDATABASE"><command>ALTER DATABASE</></>
        to manipulate <structname>datistemplate</> and
        <structname>datallowconn</> (Vik Fearing)
       </para>

       <para>
        This allows these per-database settings to be
        changed without manually modifying the <link
        linkend="catalog-pg-database"><structname>pg_database</></>
        system catalog.
       </para>
      </listitem>

     </itemizedlist>

     <sect4>
      <title><link linkend="ddl-foreign-data">Foreign Tables</link></title>

      <itemizedlist>

      <listitem>
<!--
2014-07-10 [59efda3] Tom Lane: Implement IMPORT FOREIGN SCHEMA.
-->
       <para>
        Add support for <xref linkend="SQL-IMPORTFOREIGNSCHEMA">
        (Ronan Dunklau, Michael Paquier, Tom Lane)
       </para>

       <para>
        This command allows automatic creation of local foreign tables
        that match the structure of existing tables on a remote server.
       </para>
      </listitem>

      <listitem>
<!--
2014-12-17 [fc2ac1f] Tom Lane: Allow CHECK constraints to be placed on foreign..
-->
       <para>
        Allow <literal>CHECK</> constraints to be placed on foreign tables
        (Shigeru Hanada, Etsuro Fujita)
       </para>

       <para>
        Such constraints are assumed to be enforced on the remote server,
        and are not enforced locally.  However, they are assumed to hold for
        purposes of query optimization, such
        as <link linkend="ddl-partitioning-constraint-exclusion">constraint
        exclusion</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-22 [cb1ca4d] Tom Lane: Allow foreign tables to participate in inherita..
-->
       <para>
        Allow foreign tables to participate in inheritance (Shigeru Hanada,
        Etsuro Fujita)
       </para>

       <para>
        To let this work naturally, foreign tables are now allowed to have
        check constraints marked as not valid, and to set storage
        and <type>OID</> characteristics, even though these operations are
        effectively no-ops for a foreign table.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-01 [e7cb7ee] Robert..: Allow FDWs and custom scan providers to replace..
2015-05-10 [1a8a4e5] Tom Lane: Code review for foreign/custom join pushdown pa..
-->
       <para>
        Allow foreign data wrappers and custom scans to implement join
        pushdown (KaiGai Kohei)
       </para>
      </listitem>

     </itemizedlist>

     </sect4>

     <sect4>
      <title><link linkend="event-triggers">Event Triggers</link></title>

      <itemizedlist>

       <listitem>
<!--
2015-05-11 [b488c58] Alvaro..: Allow on-the-fly capture of DDL event details
-->
        <para>
         Whenever a <literal>ddl_command_end</> event trigger is installed,
         capture details of <acronym>DDL</> activity for it to inspect
         (&Aacute;lvaro Herrera)
        </para>

        <para>
         This information is available through a set-returning function <link
         linkend="pg-event-trigger-ddl-command-end-functions"><function>pg_event_trigger_ddl_commands()</></link>,
         or by inspection of C data structures if that function doesn't
         provide enough detail.
        </para>
       </listitem>

       <listitem>
<!--
2014-12-08 [618c943] Simon ..: Event Trigger for table_rewrite
-->
        <para>
         Allow event triggers on table rewrites caused by <link
         linkend="SQL-ALTERTABLE"><command>ALTER TABLE</></> (Dimitri
         Fontaine)
        </para>
       </listitem>

       <listitem>
<!--
2015-02-23 [296f3a6] Alvaro..: Support more commands in event triggers
-->
        <para>
         Add event trigger support for database-level <link
         linkend="SQL-COMMENT"><command>COMMENT</></>, <link
         linkend="SQL-SECURITY-LABEL"><command>SECURITY LABEL</></>,
         and <link linkend="SQL-GRANT"><command>GRANT</></>/<link
         linkend="SQL-REVOKE"><command>REVOKE</></> (&Aacute;lvaro Herrera)
        </para>
       </listitem>

       <listitem>
<!--
2014-12-30 [72dd233] Alvaro..: pg_event_trigger_dropped_objects: Add name/args..
2015-04-06 [e9a077c] Alvaro..: pg_event_trigger_dropped_objects: add is_temp c..
-->
        <para>
         Add columns to the output of <link
         linkend="pg-event-trigger-sql-drop-functions"><function>pg_event_trigger_dropped_objects</></>
         (&Aacute;lvaro Herrera)
        </para>

        <para>
         This allows simpler processing of delete operations.
        </para>
       </listitem>

      </itemizedlist>

     </sect4>

   </sect3>

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

    <itemizedlist>

     <listitem>
<!--
2014-09-09 [57b1085] Peter ..: Allow empty content in xml type
-->
      <para>
       Allow the <link linkend="datatype-xml"><type>xml</></> data type
       to accept empty or all-whitespace content values (Peter Eisentraut)
      </para>

      <para>
       This is required by the <acronym>SQL</>/<acronym>XML</>
       specification.
      </para>
     </listitem>

     <listitem>
<!--
2014-10-21 [6f04368] Peter ..: Allow input format xxxx-xxxx-xxxx for macaddr ..
-->
      <para>
       Allow <link linkend="datatype-macaddr"><type>macaddr</></> input
       using the format <literal>xxxx-xxxx-xxxx</> (Herwin Weststrate)
      </para>
     </listitem>

     <listitem>
<!--
2014-10-18 [417f924] Bruce ..: interval:  tighten precision specification
-->
      <para>
       Disallow non-SQL-standard syntax for <link
       linkend="datatype-interval-input"><type>interval</></link> with
       both precision and field specifications (Bruce Momjian)
      </para>

      <para>
       Per the standard, such type specifications should be written as,
       for example, <literal>INTERVAL MINUTE TO SECOND(2)</>.
       <productname>PostgreSQL</> formerly allowed this to be written as
       <literal>INTERVAL(2) MINUTE TO SECOND</>, but it must now be
       written in the standard way.
      </para>
     </listitem>

     <listitem>
<!--
2015-04-01 [89840d7] Tom Lane: Provide real selectivity estimators for inet/ci..
-->
      <para>
       Add selectivity estimators for <link
       linkend="datatype-inet"><type>inet</></>/<link
       linkend="datatype-cidr"><type>cidr</></> operators and improve
       estimators for text search functions (Emre Hasegeli, Tom Lane)
      </para>
     </listitem>

     <listitem>
<!--
2015-05-09 [0c90f67] Andrew..: Add new OID alias type regrole
2015-05-09 [cb9fa80] Andrew..: Add new OID alias type regnamespace
-->
      <para>
       Add data
       types <link linkend="datatype-oid-table"><type>regrole</></link>
       and <link linkend="datatype-oid-table"><type>regnamespace</></link>
       to simplify entering and pretty-printing the <type>OID</> of a role
       or namespace (Kyotaro Horiguchi)
      </para>
     </listitem>

    </itemizedlist>

    <sect4>
     <title><link linkend="datatype-json"><acronym>JSON</></link></title>

     <itemizedlist>

      <listitem>
<!--
2015-05-12 [c694701] Andrew..: Additional functions and operators for jsonb
2015-05-31 [37def42] Andrew..: Rename jsonb_replace to jsonb_set and allow it ..
-->
       <para>
        Add <type>jsonb</> functions <link
        linkend="functions-json-processing-table"><function>jsonb_set()</></>
        and <link
        linkend="functions-json-processing-table"><function>jsonb_pretty()</></>
        (Dmitry Dolgov, Andrew Dunstan, Petr Jel&iacute;nek)
       </para>
      </listitem>

      <listitem>
<!--
2014-12-12 [7e354ab] Andrew..: Add several generator functions for jsonb that ..
-->
       <para>
        Add <type>jsonb</> generator functions <link
        linkend="functions-json-creation-table"><function>to_jsonb()</></>,
        <link
        linkend="functions-json-creation-table"><function>jsonb_object()</></>,
        <link
        linkend="functions-json-creation-table"><function>jsonb_build_object()</></>,
        <link
        linkend="functions-json-creation-table"><function>jsonb_build_array()</></>,
        <link
        linkend="functions-aggregate-table"><function>jsonb_agg()</></>,
        and <link
        linkend="functions-aggregate-table"><function>jsonb_object_agg()</></>
        (Andrew Dunstan)
       </para>

       <para>
        Equivalent functions already existed for type <type>json</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-03 [b67f1ce] Tom Lane: Reduce json <=> jsonb casts from explicit-only..
-->
       <para>
        Reduce casting requirements to/from <link
        linkend="datatype-json"><type>json</></> and <link
        linkend="datatype-json"><type>jsonb</></> (Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
2015-06-11 [908e234] Andrew..: Rename jsonb - text[] operator to #- to avoid a..
-->
       <para>
        Allow <type>text</>, <type>text</> array, and <type>integer</>
        values to be <link linkend="functions-jsonb-op-table">subtracted</>
        from <type>jsonb</> documents (Dmitry Dolgov, Andrew Dunstan)
       </para>
      </listitem>

      <listitem>
<!--
2015-05-12 [c694701] Andrew..: Additional functions and operators for jsonb
-->
       <para>
        Add <type>jsonb</> <link
        linkend="functions-jsonb-op-table"><literal>||</></> operator
        (Dmitry Dolgov, Andrew Dunstan)
       </para>
      </listitem>

      <listitem>
<!--
2014-12-12 [237a882] Andrew..: Add json_strip_nulls and jsonb_strip_nulls fun..
-->
       <para>
        Add <link
        linkend="functions-json-processing-table"><function>json_strip_nulls()</></>
        and <link
        linkend="functions-json-processing-table"><function>jsonb_strip_nulls()</></>
        functions to remove JSON null values from documents
        (Andrew Dunstan)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

   <sect3>
    <title>Functions</title>

     <itemizedlist>

      <listitem>
<!--
2014-11-11 [1871c89] Fujii ..: Add generate_series(numeric, numeric).
-->
       <para>
        Add <link linkend="functions-srf"><function>generate_series()</></>
        for <type>numeric</> values (Plato Malugin)
       </para>
      </listitem>

      <listitem>
<!--
2014-11-25 [bac2739] Tom Lane: Support arrays as input to array_agg() and ARRA..
-->
       <para>
        Allow <link
        linkend="functions-aggregate-table"><function>array_agg()</></> and
        <function>ARRAY()</> to take arrays as inputs (Ali Akbar, Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-18 [13dbc7a] Alvaro..: array_offset() and array_offsets()
2015-03-30 [97690ea] Alvaro..: Change array_offset to return subscripts, not o..
-->
       <para>
        Add functions <link
        linkend="array-functions-table"><function>array_position()</></>
        and <link
        linkend="array-functions-table"><function>array_positions()</></>
        to return subscripts of array values (Pavel Stehule)
       </para>
      </listitem>

      <listitem>
<!--
2014-12-15 [4520ba6] Heikki..: Add point <-> polygon distance operator.
-->
       <para>
        Add a <type>point</>-to-<type>polygon</> distance operator
        <link linkend="functions-geometry-op-table">&lt;-&gt;</>
        (Alexander Korotkov)
       </para>
      </listitem>

      <listitem>
<!--
2014-08-27 [8167a38] Jeff D..: Allow multibyte characters as escape in SIMILA..
-->
       <para>
        Allow multibyte characters as escapes in <link
        linkend="functions-similarto-regexp"><literal>SIMILAR TO</></>
        and <link linkend="functions-string-sql"><literal>SUBSTRING</></>
        (Jeff Davis)
       </para>

       <para>
        Previously, only a single-byte character was allowed as an escape.
       </para>
      </listitem>

      <listitem>
<!--
2014-09-09 [e80252d] Tom Lane: Add width_bucket(anyelement, anyarray).
-->
       <para>
        Add a <link
        linkend="functions-math-func-table"><function>width_bucket()</></>
        variant that supports any sortable data type and non-uniform bucket
        widths (Petr Jel&iacute;nek)
       </para>
      </listitem>

      <listitem>
<!--
2015-06-28 [cb2acb1] Heikki..: Add missing_ok option to the SQL functions for..
-->
       <para>
        Add an optional <replaceable>missing_ok</> argument to <link
        linkend="functions-admin-genfile-table"><function>pg_read_file()</></>
        and related functions (Michael Paquier, Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-10 [865f14a] Robert..: Allow named parameters to be specified using =>..
-->
       <para>
        Allow <link linkend="sql-syntax-calling-funcs"><literal>=&gt;</></>
        to specify named parameters in function calls (Pavel Stehule)
       </para>

       <para>
        Previously only <literal>:=</> could be used.  This requires removing
        the possibility for <literal>=&gt;</> to be a user-defined operator.
        Creation of user-defined <literal>=&gt;</> operators has been issuing
        warnings since PostgreSQL 9.0.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-25 [06bf0dd] Tom Lane: Upgrade src/port/rint.c to be POSIX-compliant.
-->
       <para>
        Add <acronym>POSIX</>-compliant rounding for platforms that use
        PostgreSQL-supplied rounding functions (Pedro Gimeno Fortea)
       </para>
      </listitem>

     </itemizedlist>

    <sect4>
     <title>System Information Functions and Views</title>

     <itemizedlist>

      <listitem>
<!--
2014-12-23 [d7ee82e] Alvaro..: Add SQL-callable pg_get_object_address
2014-12-30 [a676201] Alvaro..: Add pg_identify_object_as_address
-->
       <para>
        Add function <link
        linkend="functions-info-object-table"><function>pg_get_object_address()</></>
        to return <type>OID</>s that uniquely
        identify an object, and function <link
        linkend="functions-info-object-table"><function>pg_identify_object_as_address()</></>
        to return object information based on <type>OID</>s (&Aacute;lvaro
        Herrera)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-19 [bf03889] Stephe..: GetUserId() changes to has_privs_of_role()
-->
       <para>
        Loosen security checks for viewing queries in <link
        linkend="pg-stat-activity-view"><structname>pg_stat_activity</></>,
        executing <link
        linkend="functions-admin-signal-table"><function>pg_cancel_backend()</></>,
        and executing <link
        linkend="functions-admin-signal-table"><function>pg_terminate_backend()</></>
        (Stephen Frost)
       </para>

       <para>
        Previously, only the specific role owning the target session could
        perform these operations; now membership in that role is sufficient.
       </para>
      </listitem>

      <listitem>
<!--
2015-02-19 [2fb7a75] Tom Lane: Add pg_stat_get_snapshot_timestamp() to show s..
-->
       <para>
        Add <link
        linkend="monitoring-stats-funcs-table"><function>pg_stat_get_snapshot_timestamp()</></>
        to output the time stamp of the statistics snapshot (Matt Kelly)
       </para>

       <para>
        This represents the last time the snapshot file was written to
        the file system.
       </para>
      </listitem>

      <listitem>
<!--
2014-09-10 [36ad1a8] Bruce ..: Implement mxid_age() to compute multi-xid age
-->
       <para>
        Add <link
        linkend="vacuum-for-multixact-wraparound"><function>mxid_age()</></>
        to compute multi-xid age (Bruce Momjian)
       </para>
      </listitem>
     </itemizedlist>

    </sect4>

    <sect4>
     <title>Aggregates</title>

     <itemizedlist>

      <listitem>
<!--
2014-08-28 [6c40f83] Tom Lane: Add min and max aggregates for inet/cidr data t..
-->
       <para>
        Add <function>min()</>/<function>max()</> aggregates
        for <link linkend="datatype-inet"><type>inet</></>/<link
        linkend="datatype-cidr"><type>cidr</></> data types (Haribabu
        Kommi)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-20 [8122e14] Andres..: Add, optional, support for 128bit integers.
2015-03-20 [959277a] Andres..: Use 128-bit math to accelerate some aggregation..
-->
       <para>
        Use 128-bit integers, where supported, as accumulators for some
        aggregate functions (Andreas Karlsson)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

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

    <itemizedlist>

     <listitem>
<!--
2014-07-03 [8b6010b] Tom Lane: Improve support for composite types in PL/Python.
-->
      <para>
       Improve support for composite types in <link
       linkend="plpython"><application>PL/Python</></> (Ed Behn, Ronan
       Dunklau)
      </para>

      <para>
       This allows <application>PL/Python</> functions to return arrays
       of composite types.
      </para>
     </listitem>

     <listitem>
<!--
2015-03-11 [1ce7a57] Peter ..: PL/Python: Avoid lossiness in float conversion
-->
      <para>
       Reduce lossiness of <link
       linkend="plpython"><application>PL/Python</></> floating-point value
       conversions (Marko Kreen)
      </para>
     </listitem>

     <listitem>
<!--
2015-04-26 [cac7658] Peter ..: Add transforms feature
-->
      <para>
       Allow specification of conversion routines between <acronym>SQL</>
       data types and data types of procedural languages (Peter Eisentraut)
      </para>

      <para>
       This change adds new commands <link
       linkend="SQL-CREATETRANSFORM"><command>CREATE</></>/<link
       linkend="SQL-DROPTRANSFORM"><command>DROP TRANSFORM</></>.
       This also adds optional transformations between the <link
       linkend="hstore"><application>hstore</></> and <link
       linkend="ltree"><application>ltree</></> types to/from <link
       linkend="plperl"><application>PL/Perl</></> and <link
       linkend="plpython"><application>PL/Python</></>.
      </para>
     </listitem>

     </itemizedlist>

     <sect4>
      <title><link linkend="plpgsql">PL/pgSQL</link> Server-Side Language</title>

      <itemizedlist>

     <listitem>
<!--
2015-05-14 [1dc5ebc] Tom Lane: Support "expanded" objects, particularly arrays..
2015-02-16 [e983c4d] Tom Lane: Rationalize the APIs of array element/slice acc..
2015-02-18 [56a79a8] Tom Lane: Split array_push into separate array_append and..
2015-02-16 [9e3ad1a] Tom Lane: Use fast path in plpgsql's RETURN/RETURN NEXT i..
-->
      <para>
       Improve <link linkend="plpgsql"><application>PL/pgSQL</></> array
       performance (Tom Lane)
      </para>
     </listitem>

     <listitem>
<!--
2015-03-25 [a4847fc] Tom Lane: Add an ASSERT statement in plpgsql.
-->
      <para>
       Add an <link linkend="plpgsql-statements-assert"><command>ASSERT</></>
       statement in <application>PL/pgSQL</> (Pavel Stehule)
      </para>
     </listitem>

     <listitem>
<!--
2014-11-25 [bb1b8f6] Tom Lane: De-reserve most statement-introducing keywords ..
-->
      <para>
       Allow more <link linkend="plpgsql"><application>PL/pgSQL</></>
       keywords to be used as identifiers (Tom Lane)
      </para>
     </listitem>

    </itemizedlist>

    </sect4>

   </sect3>

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

    <itemizedlist>

     <listitem>
<!--
2015-04-11 [83aca89] Peter ..: Move pg_archivecleanup from contrib/ to src/bin/
2015-04-19 [00882d9] Peter ..: Move pg_test_fsync from contrib/ to src/bin/
2015-04-20 [528c2e4] Peter ..: Move pg_test_timing from contrib/ to src/bin/
2015-04-21 [b0a738f] Peter ..: Move pg_xlogdump from contrib/ to src/bin/
-->
      <para>
       Move <link
       linkend="pgarchivecleanup"><application>pg_archivecleanup</></>,
       <link linkend="pgtestfsync"><application>pg_test_fsync</></>,
       <link linkend="pgtesttiming"><application>pg_test_timing</></>,
       and <link linkend="pgwaldump"><application>pg_xlogdump</></>
       from <filename>contrib</> to <filename>src/bin</> (Peter Eisentraut)
      </para>

      <para>
       This should result in these programs being installed by default in
       most installations.
      </para>
     </listitem>

     <listitem>
<!--
2015-03-23 [61081e7] Heikki..: Add pg_rewind, for re-synchronizing a master se..
-->
      <para>
       Add <link linkend="app-pgrewind"><application>pg_rewind</></>,
       which allows re-synchronizing a master server after failback
       (Heikki Linnakangas)
      </para>
     </listitem>

     <listitem>
<!--
2014-10-06 [d9f38c7] Andres..: Add support for managing physical replication s..
-->
      <para>
       Allow <link
       linkend="app-pgreceivewal"><application>pg_receivexlog</></>
       to manage physical replication slots (Michael Paquier)
      </para>

      <para>
       This is controlled via new <option>--create-slot</> and
       <option>--drop-slot</> options.
      </para>
     </listitem>

     <listitem>
<!--
2014-11-18 [c4f99d2] Fujii ..: Add &#8211;&#8211;synchronous option to pg_receivexlog, for..
-->
      <para>
       Allow <link
       linkend="app-pgreceivewal"><application>pg_receivexlog</></>
       to synchronously flush <acronym>WAL</> to storage using new
       <option>--synchronous</> option (Furuya Osamu, Fujii Masao)
      </para>

      <para>
       Without this, <acronym>WAL</> files are fsync'ed only on close.
      </para>
     </listitem>

     <listitem>
<!--
2015-01-23 [a179232] Alvaro..: vacuumdb: enable parallel mode
-->
      <para>
       Allow <link linkend="APP-VACUUMDB"><application>vacuumdb</></> to
       vacuum in parallel using new <option>--jobs</> option (Dilip Kumar)
      </para>
     </listitem>

     <listitem>
<!--
2015-11-12 [5094da9] Alvaro..: vacuumdb: don't prompt for passwords over and ..
-->
      <para>
       In <link linkend="APP-VACUUMDB"><application>vacuumdb</></>, do not
       prompt for the same password repeatedly when multiple connections
       are necessary (Haribabu Kommi, Michael Paquier)
      </para>
     </listitem>

     <listitem>
<!--
2015-05-15 [458a077] Fujii ..: Support &#8211;&#8211;verbose option in reindexdb.
-->
      <para>
       Add <option>--verbose</> option to <link
       linkend="APP-REINDEXDB"><application>reindexdb</></> (Sawada
       Masahiko)
      </para>
     </listitem>

     <listitem>
<!--
2015-05-12 [72d422a] Andrew..: Map basebackup tablespaces using a tablespace_..
-->
      <para>
       Make <link linkend="app-pgbasebackup"><application>pg_basebackup</></>
       use a tablespace mapping file when using <application>tar</> format,
       to support symbolic links and file paths of 100+ characters in length
       on <systemitem class="osname">MS Windows</> (Amit Kapila)
      </para>
     </listitem>

     <listitem>
<!--
2014-09-19 [728f152] Andres..: Add rmgr callback to name xlog record types for..
2014-09-19 [bdd5726] Andres..: Add the capability to display summary statistic..
-->
      <para>
       Add <link linkend="pgwaldump"><application>pg_xlogdump</></> option
       <option>--stats</> to display summary statistics (Abhijit Menon-Sen)
      </para>
     </listitem>

    </itemizedlist>

     <sect4>
      <title><xref linkend="APP-PSQL"></title>

      <itemizedlist>

       <listitem>
<!--
2015-03-31 [9d9991c] Bruce ..: psql:  add asciidoc output format
-->
        <para>
         Allow <application>psql</> to produce AsciiDoc output (Szymon Guz)
        </para>
       </listitem>

       <listitem>
<!--
2014-07-10 [5b214c5] Fujii ..: Add new ECHO mode 'errors' that displays only ..
-->
        <para>
         Add an <literal>errors</> mode that displays only failed commands
         to <application>psql</>'s <varname>ECHO</> variable
         (Pavel Stehule)
        </para>

        <para>
         This behavior can also be selected with <application>psql</>'s
         <option>-b</> option.
        </para>
       </listitem>

       <listitem>
<!--
2014-09-12 [a2dabf0] Stephe..: Add unicode_{column|header|border}_style to psql
-->
        <para>
         Provide separate column, header, and border linestyle control
         in <application>psql</>'s unicode linestyle (Pavel Stehule)
        </para>

        <para>
         Single or double lines are supported; the default is
         <literal>single</>.
        </para>
       </listitem>

       <listitem>
<!--
2014-09-02 [51bb795] Andres..: Add psql PROMPT variable showing which line of ..
-->
        <para>
         Add new option <literal>%l</> in <application>psql</>'s <link
         linkend="APP-PSQL-variables"><envar>PROMPT</></> variables
         to display the current multiline statement line number
         (Sawada Masahiko)
        </para>
       </listitem>

       <listitem>
<!--
2015-03-28 [7655f4c] Andrew..: Add a pager_min_lines setting to psql
-->
        <para>
         Add <literal>\pset</> option <link
         linkend="APP-PSQL-meta-commands"><varname>pager_min_lines</></>
         to control pager invocation (Andrew Dunstan)
        </para>
       </listitem>

       <listitem>
<!--
2014-11-21 [4077fb4] Andrew..: Fix an error in psql that overcounted output l..
-->
        <para>
         Improve <application>psql</> line counting used when deciding
         to invoke the pager (Andrew Dunstan)
        </para>
       </listitem>

       <listitem>
<!--
2015-12-03 [07338cb] Tom Lane: Clean up some psql issues around handling of t..
2015-12-08 [e90371d] Tom Lane: Make failure to open psql log-file fatal.
-->
        <para>
         <application>psql</> now fails if the file specified by
         an <option>--output</> or <option>--log-file</> switch cannot be
         written (Tom Lane, Daniel V&eacute;rit&eacute;)
        </para>

        <para>
         Previously, it effectively ignored the switch in such cases.
        </para>
       </listitem>

       <listitem>
<!--
2014-07-12 [bd40951] Andres..: Minimal psql tab completion support for SET se..
-->
        <para>
         Add <application>psql</> tab completion when setting the
         <xref linkend="guc-search-path"> variable (Jeff Janes)
        </para>

        <para>
         Currently only the first schema can be tab-completed.
        </para>
       </listitem>

       <listitem>
<!--
2014-06-23 [631e7f6] Heikki..: Improve tab-completion of DROP and ALTER ENABLE..
-->
        <para>
         Improve <application>psql</>'s tab completion for triggers and rules
         (Andreas Karlsson)
        </para>
       </listitem>

      </itemizedlist>

     <sect5>
      <title><link linkend="APP-PSQL-meta-commands">Backslash Commands</link></title>

      <itemizedlist>

       <listitem>
<!--
2014-09-10 [07c8651] Andres..: Add new psql help topics, accessible to both..
-->
        <para>
         Add <application>psql</> <command>\?</> help sections
         <literal>variables</> and <literal>options</> (Pavel Stehule)
        </para>

        <para>
         <literal>\? variables</> shows <application>psql</>'s special
         variables and <literal>\? options</> shows the command-line options.
         <command>\? commands</> shows the meta-commands, which is the
         traditional output and remains the default.  These help displays
         can also be obtained with the command-line
         option <literal>--help=<replaceable>section</></literal>.
        </para>
       </listitem>

       <listitem>
<!--
2014-07-14 [ee80f04] Alvaro..: psql: Show tablespace size in \db+
-->
        <para>
         Show tablespace size in <application>psql</>'s <literal>\db+</>
         (Fabr&iacute;zio de Royes Mello)
        </para>
       </listitem>

       <listitem>
<!--
2015-04-09 [a6f3c1f] Magnus..: Show owner of types in psql \dT+
-->
        <para>
         Show data type owners in <application>psql</>'s <literal>\dT+</>
         (Magnus Hagander)
        </para>
       </listitem>

       <listitem>
<!--
2014-09-04 [f6f654f] Fujii ..: Allow \watch to display query execution time if..
-->
        <para>
         Allow <application>psql</>'s <command>\watch</> to output
         <command>\timing</> information (Fujii Masao)
        </para>

        <para>
         Also prevent <option>--echo-hidden</> from echoing
         <command>\watch</> queries, since that is generally unwanted.
        </para>
       </listitem>

       <listitem>
<!--
2014-11-22 [eca2b9b] Andrew..: Rework echo_hidden for \sf and \ef from commit ..
-->
        <para>
         Make <application>psql</>'s <literal>\sf</> and <literal>\ef</>
         commands honor <envar>ECHO_HIDDEN</> (Andrew Dunstan)
        </para>
       </listitem>

       <listitem>
<!--
2014-08-12 [e15c4ab] Fujii ..: Add tab-completion for \unset and valid setting..
-->
        <para>
         Improve <application>psql</> tab completion for <command>\set</>,
         <command>\unset</>, and <literal>:variable</> names (Pavel
         Stehule)
        </para>
       </listitem>

       <listitem>
<!--
2014-11-10 [095d401] Robert..: Tab complete second argument to \c with role n..
-->
        <para>
         Allow tab completion of role names
         in <application>psql</> <literal>\c</> commands (Ian Barwick)
        </para>
       </listitem>

      </itemizedlist>

     </sect5>

    </sect4>

    <sect4>
     <title><xref linkend="APP-PGDUMP"></title>

     <itemizedlist>

      <listitem>
<!--
2014-11-17 [be1cc8f] Simon ..: Add pg_dump &#8211;&#8211;snapshot option
-->
       <para>
        Allow <application>pg_dump</> to share a snapshot taken by another
        session using <option>--snapshot</> (Simon Riggs, Michael Paquier)
       </para>

       <para>
        The remote snapshot must have been exported by
        <function>pg_export_snapshot()</> or logical replication slot
        creation.  This can be used to share a consistent snapshot
        across multiple <application>pg_dump</> processes.
       </para>
      </listitem>

      <listitem>
<!--
2015-11-21 [5f5e68b] Tom Lane: Adopt the GNU convention for handling tar-arch..
-->
       <para>
        Support table sizes exceeding 8GB in tar archive format (Tom Lane)
       </para>

       <para>
        The POSIX standard for tar format does not allow elements of a tar
        archive to exceed 8GB, but most modern implementations of tar
        support an extension that does allow it.  Use the extension format
        when necessary, rather than failing.
       </para>
      </listitem>

      <listitem>
<!--
2014-07-07 [7700597] Tom Lane: In pg_dump, show server and pg_dump versions w..
-->
       <para>
        Make <application>pg_dump</> always print the server and
        <application>pg_dump</> versions (Jing Wang)
       </para>

       <para>
        Previously, version information was only printed in
        <option>--verbose</> mode.
       </para>
      </listitem>

      <listitem>
<!--
2015-06-04 [232cd63] Fujii ..: Remove -i/-ignore-version option from pg_dump..
-->
       <para>
        Remove the long-ignored <option>-i</>/<option>--ignore-version</>
        option from <application>pg_dump</>, <application>pg_dumpall</>,
        and <application>pg_restore</> (Fujii Masao)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

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

     <itemizedlist>

      <listitem>
<!--
2014-08-25 [ebe30ad] Bruce ..: pg_ctl, pg_upgrade:  allow multiple -o/-O opti..
-->
       <para>
        Support multiple <application>pg_ctl</> <option>-o</> options,
        concatenating their values (Bruce Momjian)
       </para>
      </listitem>

      <listitem>
<!--
2014-07-17 [c0e4520] Magnus..: Add option to pg_ctl to choose event source for..
-->
       <para>
        Allow control of <application>pg_ctl</>'s event source logging
        on <systemitem class="osname">MS Windows</> (MauMau)
       </para>

       <para>
        This only controls <application>pg_ctl</>, not the server, which
        has separate settings in <filename>postgresql.conf</>.
       </para>
      </listitem>

      <listitem>
<!--
2015-11-08 [bdb42ba] Noah M..: Don't connect() to a wildcard address in test_..
-->
       <para>
        If the server's listen address is set to a wildcard value
        (<literal>0.0.0.0</> in IPv4 or <literal>::</> in IPv6), connect via
        the loopback address rather than trying to use the wildcard address
        literally (Kondo Yuta)
       </para>

       <para>
        This fix primarily affects Windows, since on other platforms
        <application>pg_ctl</> will prefer to use a Unix-domain socket.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

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

     <itemizedlist>

      <listitem>
<!--
2015-04-14 [9fa8b0e] Peter ..: Move pg_upgrade from contrib/ to src/bin/
-->
       <para>
        Move <application>pg_upgrade</> from <filename>contrib</> to
        <filename>src/bin</> (Peter Eisentraut)
       </para>

       <para>
        In connection with this change, the functionality previously
        provided by the <application>pg_upgrade_support</> module has been
        moved into the core server.
       </para>
      </listitem>

      <listitem>
<!--
2014-08-25 [ebe30ad] Bruce ..: pg_ctl, pg_upgrade:  allow multiple -o/-O optio..
-->
       <para>
        Support multiple <application>pg_upgrade</>
        <option>-o</>/<option>-O</> options,
        concatenating their values (Bruce Momjian)
       </para>
      </listitem>

      <listitem>
<!--
2014-10-10 [33755e8] Heikki..: Change the way encoding and locale checks are d..
-->
       <para>
        Improve database collation comparisons in
        <application>pg_upgrade</> (Heikki Linnakangas)
       </para>
      </listitem>

      <listitem>
<!--
2014-08-25 [2209b39] Bruce ..: pg_upgrade:  remove support for 8.3 old clusters
-->
       <para>
        Remove support for upgrading from 8.3 clusters (Bruce Momjian)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

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

     <itemizedlist>

      <listitem>
<!--
2015-04-13 [81134af] Peter ..: Move pgbench from contrib/ to src/bin/
-->
       <para>
        Move pgbench from <filename>contrib</> to <filename>src/bin</>
        (Peter Eisentraut)
       </para>
      </listitem>

      <listitem>
<!--
2015-09-30 [3c4c5ac] Tatsuo..: Fix incorrect tps number calculation in "exclu..
-->
       <para>
        Fix calculation of TPS number <quote>excluding connections
        establishing</> (Tatsuo Ishii, Fabien Coelho)
       </para>

       <para>
        The overhead for connection establishment was miscalculated whenever
        the number of pgbench threads was less than the number of client
        connections.  Although this is clearly a bug, we won't back-patch it
        into pre-9.5 branches since it makes TPS numbers not comparable to
        previous results.
       </para>
      </listitem>

      <listitem>
<!--
2014-10-13 [98aed6c] Heikki..: Add &#8211;&#8211;latency-limit option to pgbench.
-->
       <para>
        Allow counting of pgbench transactions that take over a specified
        amount of time (Fabien Coelho)
       </para>

       <para>
        This is controlled by a new <option>--latency-limit</> option.
       </para>
      </listitem>

      <listitem>
<!--
2014-07-30 [ed802e7] Robert..: pgbench: Allow \setrandom to generate Gaussian..
-->
       <para>
        Allow pgbench to generate Gaussian/exponential distributions
        using <command>\setrandom</> (Kondo Mitsumasa, Fabien Coelho)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-02 [878fdcb] Robert..: pgbench: Add a real expression syntax to \set
-->
       <para>
        Allow <application>pgbench</>'s <command>\set</> command to handle
        arithmetic expressions containing more than one operator, and add
        <literal>%</> (modulo) to the set of operators it supports
        (Robert Haas, Fabien Coelho)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

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

     <itemizedlist>

      <listitem>
<!--
2014-11-20 [2c03216] Heikki..: Revamp the WAL record format.
-->
       <para>
        Simplify <link linkend="wal"><acronym>WAL</></> record format
        (Heikki Linnakangas)
       </para>

       <para>
        This allows external tools to more easily track what blocks
        are modified.
       </para>
      </listitem>

      <listitem>
<!--
2015-03-15 [4f1b890] Andres..: Merge the various forms of transaction commit &..
-->
       <para>
        Improve the representation of transaction commit and abort WAL
        records (Andres Freund)
       </para>
      </listitem>

      <listitem>
<!--
2014-09-25 [b64d92f] Andres..: Add a basic atomic ops API abstracting away pla..
-->
       <para>
        Add atomic memory operations <acronym>API</> (Andres Freund)
       </para>
      </listitem>

      <listitem>
<!--
2014-11-07 [0b03e59] Robert..: Introduce custom path and scan providers.
2014-11-20 [a34fa8e] Tom Lane: Initial code review for CustomScan patch.
2014-11-21 [c2ea228] Tom Lane: Simplify API for initially hooking custom-path ..
2014-11-21 [4477704] Tom Lane: Rearrange CustomScan API.
-->
       <para>
        Allow custom path and scan methods (KaiGai Kohei, Tom Lane)
       </para>

       <para>
        This allows extensions greater control over the optimizer and
        executor.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-12 [afb9249] Tom Lane: Add support for doing late row locking in FDWs.
-->
       <para>
        Allow foreign data wrappers to do post-filter locking (Etsuro
        Fujita)
       </para>
      </listitem>

      <listitem>
<!--
2015-05-08 [168d580] Andres..: Add support for INSERT ... ON CONFLICT DO NOTHI..
2015-05-08 [2c8f483] Andres..: Represent columns requiring insert and update p..
-->
       <para>
        Foreign tables can now take part in <command>INSERT ... ON CONFLICT
        DO NOTHING</> queries (Peter Geoghegan, Heikki Linnakangas,
        Andres Freund)
       </para>

       <para>
        Foreign data wrappers must be modified to handle this.
        <command>INSERT ... ON CONFLICT DO UPDATE</> is not supported on
        foreign tables.
       </para>
      </listitem>

      <listitem>
<!--
2014-12-18 [4a14f13] Tom Lane: Improve hash_create's API for selecting simple-..
-->
       <para>
        Improve <function>hash_create()</>'s API for selecting
        simple-binary-key hash functions (Teodor Sigaev, Tom Lane)
       </para>
      </listitem>

      <listitem>
<!--
2015-04-30 [924bcf4] Robert..: Create an infrastructure for parallel computati..
2014-10-31 [2bd9e41] Robert..: Support frontend-backend protocol communication..
-->
       <para>
        Improve parallel execution infrastructure (Robert Haas, Amit
        Kapila, Noah Misch, Rushabh Lathia, Jeevan Chalke)
       </para>
      </listitem>

      <listitem>
<!--
2014-06-28 [a6d488c] Andres..: Remove Alpha and Tru64 support.
-->
       <para>
        Remove <productname>Alpha</> (<acronym>CPU</>) and <systemitem
        class="osname">Tru64</> (OS) ports (Andres Freund)
       </para>
      </listitem>

      <listitem>
<!--
2014-07-06 [4893ccd] Robert..: Remove swpb-based spinlock implementation for A..
-->
       <para>
        Remove swap-byte-based spinlock implementation for
        <acronym>ARM</>v5 and earlier <acronym>CPU</>s (Robert Haas)
       </para>

       <para>
        <acronym>ARM</>v5's weak memory ordering made this locking
        implementation unsafe.  Spinlock support is still possible on
        newer gcc implementations with atomics support.
       </para>
      </listitem>

      <listitem>
<!--
2015-02-24 [23a7835] Peter ..: Error when creating names too long for tar for..
-->
       <para>
        Generate an error when excessively long (100+ character) file
        paths are written to tar files (Peter Eisentraut)
       </para>

       <para>
        Tar does not support such overly-long paths.
       </para>
      </listitem>

      <listitem>
<!--
2015-05-19 [0b28ea7] Tom Lane: Avoid collation dependence in indexes of syste..
-->
       <para>
        Change index operator class for columns <link
        linkend="catalog-pg-seclabel"><structname>pg_seclabel</></>.<structname>provider</>
        and <link
        linkend="catalog-pg-shseclabel"><structname>pg_shseclabel</></>.<structname>provider</>
        to be <literal>text_pattern_ops</> (Tom Lane)
       </para>

       <para>
        This avoids possible problems with these indexes when different
        databases of a cluster have different default collations.
       </para>
      </listitem>

      <listitem>
<!--
2014-09-09 [0709b7e] Robert..: Change the spinlock primitives to function as c..
-->
       <para>
        Change the spinlock primitives to function as compiler barriers
        (Robert Haas)
       </para>
      </listitem>

     </itemizedlist>

    <sect4>
     <title>MS Windows</title>

     <itemizedlist>

      <listitem>
<!--
2014-12-08 [519b075] Simon ..: Use GetSystemTimeAsFileTime directly in win32
2014-12-08 [8001fe6] Simon ..: Windows: use GetSystemTimePreciseAsFileTime if ..
-->
       <para>
        Allow higher-precision time stamp resolution on <systemitem
        class="osname">Windows 8</>, <systemitem class="osname">Windows
        Server 2012</>, and later Windows systems (Craig Ringer)
       </para>
      </listitem>

      <listitem>
<!--
2015-03-18 [f9dead5] Alvaro..: Install shared libraries to bin/ in Windows un..
-->
       <para>
        Install shared libraries to <filename>bin</> in <systemitem
        class="osname">MS Windows</> (Peter Eisentraut, Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2015-04-16 [22d0053] Alvaro..: MSVC: install src/test/modules together with c..
-->
       <para>
        Install <filename>src/test/modules</> together with
        <filename>contrib</> on <productname>MSVC</> builds (Michael
        Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2014-07-12 [8d9a0e8] Magnus..: Support &#8211;&#8211;with-extra-version equivalent functi..
-->
       <para>
        Allow <link linkend="install-procedure">configure</>'s
        <option>--with-extra-version</> option to be honored by the
        <productname>MSVC</> build (Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2014-07-14 [91f03ba] Noah M..: MSVC: Recognize PGFILEDESC in contrib and conv..
-->
       <para>
        Pass <envar>PGFILEDESC</> into <productname>MSVC</> contrib builds
        (Michael Paquier)
       </para>
      </listitem>

      <listitem>
<!--
2014-07-14 [c4a448e] Noah M..: MSVC: Apply icons to all binaries having them ..
-->
       <para>
        Add icons to all <productname>MSVC</>-built binaries and version
        information to all <systemitem class="osname">MS Windows</>
        binaries (Noah Misch)
       </para>

       <para>
        MinGW already had such icons.
       </para>
      </listitem>

      <listitem>
<!--
2014-09-10 [311da16] Andres..: Add support for optional_argument to our own ge..
-->
       <para>
        Add optional-argument support to the internal
        <function>getopt_long()</> implementation (Michael Paquier,
        Andres Freund)
       </para>

       <para>
        This is used by the <productname>MSVC</> build.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

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

    <itemizedlist>

     <listitem>
<!--
2015-03-27 [717f709] Andrew..: Add stats for min, max, mean, stddev times to p..
-->
      <para>
       Add statistics for minimum, maximum,
       mean, and standard deviation times to <link
       linkend="pgstatstatements-columns"><application>pg_stat_statements</></>
       (Mitsumasa Kondo, Andrew Dunstan)
      </para>
     </listitem>

     <listitem>
<!--
2014-10-01 [32984d8] Heikki..: Add functions for dealing with PGP armor heade..
-->
      <para>
       Add <link linkend="pgcrypto"><application>pgcrypto</></> function
       <function>pgp_armor_headers()</> to extract <productname>PGP</>
       armor headers (Marko Tiikkaja, Heikki Linnakangas)
      </para>
     </listitem>

     <listitem>
<!--
2014-06-30 [97c40ce] Tom Lane: Allow empty replacement strings in contrib/unac..
-->
      <para>
       Allow empty replacement strings in <link
       linkend="unaccent"><application>unaccent</></> (Mohammad Alhashash)
      </para>

      <para>
       This is useful in languages where diacritic signs are represented
       as separate characters.
      </para>
     </listitem>

     <listitem>
<!--
2014-06-30 [1b24887] Tom Lane: Allow multi-character source strings in contrib..
-->
      <para>
       Allow multicharacter source strings in <link
       linkend="unaccent"><application>unaccent</></> (Tom Lane)
      </para>

      <para>
       This could be useful in languages where diacritic signs are
       represented as separate characters.  It also allows more complex
       unaccent dictionaries.
      </para>
     </listitem>

     <listitem>
<!--
2015-05-15 [9689290] Simon ..: TABLESAMPLE system_rows(limit)
2015-05-15 [149f6f1] Simon ..: TABLESAMPLE system_time(limit)
-->
      <para>
       Add <filename>contrib</> modules <link
       linkend="tsm-system-rows"><application>tsm_system_rows</></> and
       <link linkend="tsm-system-time"><application>tsm_system_time</></>
       to allow additional table sampling methods (Petr Jel&iacute;nek)
      </para>
     </listitem>

     <listitem>
<!--
2014-11-21 [3a82bc6] Heikki..: Add pageinspect functions for inspecting GIN in..
-->
      <para>
       Add <link linkend="GIN"><acronym>GIN</></>
       index inspection functions to <link
       linkend="pageinspect"><application>pageinspect</></> (Heikki
       Linnakangas, Peter Geoghegan, Michael Paquier)
      </para>
     </listitem>

     <listitem>
<!--
2014-08-22 [f577919] Andres..: Add pinning_backends column to the pg_buffercac..
-->
      <para>
       Add information about buffer pins to <link
       linkend="pgbuffercache"><application>pg_buffercache</></> display
       (Andres Freund)
      </para>
     </listitem>

     <listitem>
<!--
2015-05-13 [5850b20] Andres..: Add pgstattuple_approx() to the pgstattuple ext..
-->
      <para>
       Allow <link linkend="pgstattuple"><application>pgstattuple</></>
       to report approximate answers with less overhead using
       <function>pgstattuple_approx()</> (Abhijit Menon-Sen)
      </para>
     </listitem>

     <listitem>
<!--
2014-11-29 [22dfd11] Alvaro..: Move test modules from contrib to src/test/modu..
2014-12-01 [df761e3] Alvaro..: Move security_label test
-->
      <para>
       Move <application>dummy_seclabel</>, <application>test_shm_mq</>,
       <application>test_parser</>, and <application>worker_spi</>
       from <filename>contrib</> to <filename>src/test/modules</>
       (&Aacute;lvaro Herrera)
      </para>

      <para>
       These modules are only meant for server testing, so they do not need
       to be built or installed when packaging <productname>PostgreSQL</>.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

  </sect2>

 </sect1>
