Stamp HEAD as 13devel.

Let the hacking begin ...
author: Tom Lane <tgl@sss.pgh.pa.us> 2019-07-01 12:50:55 -0400
committer: Tom Lane <tgl@sss.pgh.pa.us> 2019-07-01 12:50:55 -0400
commit: 615cebc94b5ef8fbe353e3c8b838b1e97bcdfd49 (patch)
tree: d598ba14ee3bb6974dc4b6c445c8e85bdb6c242a /doc/src
parent: 9e1c9f959422192bbe1b842a2a1ffaf76b080196 (diff)
download: postgresql-615cebc94b5ef8fbe353e3c8b838b1e97bcdfd49.tar.gz
postgresql-615cebc94b5ef8fbe353e3c8b838b1e97bcdfd49.zip
4 files changed, 18 insertions, 3251 deletions
diff --git a/doc/src/sgml/filelist.sgml b/doc/src/sgml/filelist.sgml
index 8960f112786..3da2365ea97 100644
--- a/doc/src/sgml/filelist.sgml
+++ b/doc/src/sgml/filelist.sgml
@@ -166,7 +166,7 @@
 <!ENTITY sourcerepo SYSTEM "sourcerepo.sgml">
 
 <!ENTITY release    SYSTEM "release.sgml">
-<!ENTITY release-12     SYSTEM "release-12.sgml">
+<!ENTITY release-13     SYSTEM "release-13.sgml">
 
 <!ENTITY limits     SYSTEM "limits.sgml">
 <!ENTITY acronyms   SYSTEM "acronyms.sgml">
diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
deleted file mode 100644
index a7ff5cb4be7..00000000000
--- a/doc/src/sgml/release-12.sgml
+++ /dev/null
@@ -1,3249 +0,0 @@
-<!-- doc/src/sgml/release-12.sgml -->
-<!-- See header comment in release.sgml about typical markup -->
-
- <sect1 id="release-12">
-  <title>Release 12</title>
-
-  <formalpara>
-   <title>Release date:</title>
-   <para>2019-??-?? AS OF 2019-05-09</para>
-  </formalpara>
-
-  <sect2>
-   <title>Overview</title>
-
-   <para>
-    Major enhancements in <productname>PostgreSQL</productname> 12 include:
-   </para>
-
-   <!-- Items in this list summarize one or more items below -->
-
-   <itemizedlist>
-
-    <listitem>
-     <para>big item</para>
-    </listitem>
-
-   </itemizedlist>
-
-   <para>
-    The above items are explained in more detail in the sections below.
-   </para>
-
-  </sect2>
-
-  <sect2>
-
-  <title>Migration to Version 12</title>
-
-   <para>
-    A dump/restore using <xref linkend="app-pg-dumpall"/>, or use of <xref
-    linkend="pgupgrade"/>, is required for those wishing to migrate data
-    from any previous release.
-   </para>
-
-   <para>
-    Version 12 contains a number of changes that may affect compatibility
-    with previous releases.  Observe the following incompatibilities:
-   </para>
-
-   <itemizedlist>
-
-    <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-11-20 [578b22971] Remove WITH OIDS support, change oid catalog column visi
--->
-
-     <para>
-      Remove the special behavior of <link
-      linkend="datatype-oid">OID</link> columns (Andres Freund,
-      John Naylor)
-     </para>
-
-     <para>
-      Previously, a normally-invisible <type>OID</type> column could be
-      specified during table creation using <literal>WITH OIDS</literal>;
-      that ability has been removed.  Columns can still be explicitly
-      specified as type <type>OID</type>.  Operations on tables that
-      have columns named <type>OID</type> (created using <literal>WITH
-      OIDS</literal>) will need adjustment.  <command>SELECT *</command>
-      will now output those columns for the many system tables which
-      have them.  Previously, the columns had to be selected explicitly.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-10-11 [cda6a8d01] Remove deprecated abstime, reltime, tinterval datatypes.
--->
-
-     <para>
-      Remove data types <type>abstime</type>, <type>reltime</type>,
-      and <type>tinterval</type> (Andres Freund)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-10-11 [2d10defa7] Remove timetravel extension.
--->
-
-     <para>
-      Remove the <productname>timetravel</productname> extension
-      (Andres Freund)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-25 [2dedf4d9a] Integrate recovery.conf into postgresql.conf
--->
-
-     <para>
-      Move <filename>recovery.conf</filename> settings into <link
-      linkend="runtime-config-wal-archive-recovery"><filename>postgresql.conf</filename></link>
-      (Fujii Masao, Simon Riggs, Abhijit Menon-Sen, Sergei Kornilov)
-     </para>
-
-     <para>
-      <filename>recovery.conf</filename> is no longer used,
-      and the server will not start if the file exists.  <link
-      linkend="runtime-config-wal-archive-recovery">recovery.signal</link>
-      and standby.signal are now used to switch into non-primary
-      mode.  <varname>trigger_file</varname> has been renamed
-      to <xref linkend="guc-promote-trigger-file"/>.  The
-      <varname>standby_mode</varname> setting has been removed.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-28 [f2cbffc7a] Only allow one recovery target setting
--->
-
-     <para>
-      Do not allow multiple conflicting <link
-      linkend="runtime-config-wal-recovery-target"><varname>recovery_target</varname>*</link>
-      specifications (Peter Eisentraut)
-     </para>
-
-     <para>
-      Specifically, only allow one of <xref
-      linkend="guc-recovery-target"/>, <xref
-      linkend="guc-recovery-target-lsn"/>,
-      <xref linkend="guc-recovery-target-name"/>,
-      <xref linkend="guc-recovery-target-time"/>, <xref
-      linkend="guc-recovery-target-xid"/>.  Previously, multiple different
-      instances of the variables above could be specified, and the last one
-      was honored.  Now, only one can be specified, though the same one can
-      be specified multiple times and the last specification is honored.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-01-13 [0acb3bc33] Change default of recovery_target_timeline to <literal>latest</literal>
--->
-
-     <para>
-      Cause recovery to advance to the latest timeline by default
-      (Peter Eisentraut)
-     </para>
-
-     <para>
-      Specifically, <xref linkend="guc-recovery-target-timeline"/> now
-      defaults to <literal>latest</literal>.  Previously, it defaulted
-      to <literal>current</literal>.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2018-07-29 [a7dc63d90] Refactor geometric functions and operators
--->
-
-     <para>
-      Refactor <link linkend="functions-geometry">geometric
-      functions</link> and operators (Emre Hasegeli)
-     </para>
-
-     <para>
-      This could lead to more accurate, but slightly different, results
-      from previous releases.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2018-08-16 [c4c340088] Use the built-in float datatypes to implement geometric 
--->
-
-     <para>
-      Restructure <link linkend="datatype-geometric">geometric
-      types</link> to handle NaN, underflow, overflow and division by
-      zero more consistently (Emre Hasegeli)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2018-09-26 [2e2a392de] Fix problems in handling the line data type
--->
-
-     <para>
-      Improve behavior and error reporting for the <link
-      linkend="datatype-geometric">line data type</link> (Emre Hasegeli)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Andrew Gierth <rhodiumtoad@postgresql.org>
-2019-02-13 [02ddd4993] Change floating-point output format for improved perform
--->
-
-     <para>
-      Improve performance by changing the default number of trailing digits
-      output for <link linkend="datatype-float"><type>REAL</type></link>
-      and <type>DOUBLE PRECISION</type> values (Andrew Gierth)
-     </para>
-
-     <para>
-      Previously, float values were output rounded to 6 or 15 decimals
-      by default.  Now, only the number of digits required to preserve
-      the exact binary value is output.  The previous  behavior can be
-      restored by setting <xref linkend="guc-extra-float-digits"/> to zero.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-04-23 [c06e3550d] Don't request pretty-printed output from xmlNodeDump().
--->
-
-     <para>
-      Change <link linkend="functions-xml"><acronym>XML</acronym></link>
-      functions like <function>xpath()</function> to never pretty-print
-      their output (Tom Lane)
-     </para>
-
-     <para>
-      Previously, this happened in some rare cases.  ACCURATE?  HOW TO
-      GET PRETTY PRINT OUTPUT?
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-03-13 [6dd263cfa] Rename pg_verify_checksums to pg_checksums
--->
-
-     <para>
-      Rename command-line tool
-      <application>pg_verify_checksums</application> to <xref
-      linkend="app-pgchecksums"/> (Michaël Paquier)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-04 [413ccaa74] pg_restore: Require -f - to mean stdout
--->
-
-     <para>
-      Require specification of <xref linkend="app-pgrestore"/>
-      <literal>-f -</literal> to send the dump contents to stdout
-      (Euler Taveira)
-     </para>
-
-     <para>
-      The previous behavior was considered confusing.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-14 [eaf746a5b] Make psql's "\pset format" command reject non-unique abb
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-26 [a7eece4fc] Fix breakage of "\pset format latex".
--->
-
-     <para>
-      Disallow <application>psql</application>'s <command>\pset
-      format</command> command from using non-unique abbreviations
-      (Daniel Vérité)
-     </para>
-
-     <para>
-      Previously, <command>\pset format a</command> chose
-      <literal>aligned</literal>;  it will now error.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-This is caused by adding the tid to the btree entry, as listed later.
--->
-
-     <para>
-      The maximum btree index length is now reduced by eight bytes;
-      a <xref linkend="sql-reindex"/> operation could potentially fail.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-19 [586b98fdf] Make type "name" collation-aware.
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-04-05 [478cacb50] Ensure consistent name matching behavior in processSQLNa
--->
-
-     <para>
-      Allow data type <link
-      linkend="datatype-character-special-table">name</link> to use
-      non-C collations (Tom Lane, Daniel Vérité)
-     </para>
-
-     <para>
-      It still uses the "C" collation by default, rather than defaulting
-      to the database collation.  Regular expression operations on
-      data type name columns will now use the "C" collation;  you will
-      need to override the collation if you want to use locale-specific
-      regular expression patterns, e.g., <command>\w</command>.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-21 [bfb456c1b] Improve error reporting for DROP FUNCTION/PROCEDURE/AGGR
--->
-
-     <para>
-      Cause <link linkend="sql-dropfunction"><command>DROP IF EXISTS
-      FUNCTION</command></link>/<literal>PROCEDURE</literal>/<literal>AGGREGATE</literal>/<literal>ROUTINE</literal>
-      to generate an error if no arguments are supplied and there are
-      multiple matching objects (David Rowley)
-     </para>
-
-     <para>
-      Also improve the error message in such cases.
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-01 [96b00c433] Remove obsolete <structname>pg_constraint</structname>.consrc column
--->
-
-     <para>
-      Remove obsolete <link
-      linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>consrc</structfield>
-      column (Peter Eisentraut)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-01 [fe5038236] Remove obsolete pg_attrdef.adsrc column
--->
-
-     <para>
-      Remove obsolete <link
-      linkend="catalog-pg-attrdef"><structname>pg_attrdef</structname></link>.<structfield>adsrc</structfield>
-      column (Peter Eisentraut)
-     </para>
-    </listitem>
-
-    <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-07-10 [bcbd94080] Remove dynamic_shared_memory_type=none
--->
-
-     <para>
-      Remove the ability to disable dynamic shared memory (Kyotaro
-      Horiguchi)
-     </para>
-
-     <para>
-      Specifically, <xref linkend="guc-dynamic-shared-memory-type"/>
-      can no longer be set to <literal>none</literal>.
-     </para>
-    </listitem>
-
-   </itemizedlist>
-
-  </sect2>
-
-  <sect2>
-   <title>Changes</title>
-
-    <para>
-     Below you will find a detailed account of the changes between
-     <productname>PostgreSQL</productname> 12 and the previous
-     major release.
-    </para>
-
-   <sect3>
-    <title>Server</title>
-
-    <sect4>
-     <title><link linkend="ddl-partitioning">Partitioning</link></title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-07 [c6e4133fa] Postpone calculating total_table_pages until after pruni
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-15 [34c9e455d] Improve performance of partition pruning remapping a lit
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2018-11-16 [3f2393ede] Redesign initialization of partition routing structures
-Author: Robert Haas <rhaas@postgresql.org>
-2019-02-21 [9eefba181] Delay lock acquisition for partitions until we route a t
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-30 [428b260f8] Speed up planning when partitions can be pruned at plan 
--->
-
-       <para>
-        Improve performance of many operations on partitioned tables
-        (Amit Langote, David Rowley, Tom Lane, Álvaro Herrera)
-       </para>
-
-       <para>
-        Allow tables with thousands of child partitions to be processed
-        efficiently by operations that only affect a small number of
-        partitions.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-03 [f56f8f8da] Support foreign keys that reference partitioned tables
--->
-
-       <para>
-        Allow <link linkend="ddl-constraints-fk">foreign keys</link>
-        to reference partitioned tables (Álvaro Herrera)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-08-01 [0d5f05cde] Allow multi-inserts during COPY into a partitioned table
--->
-
-       <para>
-        Improve speed of <command>COPY</command> into partitioned tables
-        (David Rowley)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-01-25 [7c079d741] Allow generalized expression syntax for partition bounds
--->
-
-       <para>
-        Allow partitions bounds to be any expression (Kyotaro Horiguchi,
-        Tom Lane, Amit Langote)
-       </para>
-
-       <para>
-        Expressions are evaluated at partitioned table creation time.
-        Previously, only constants were allowed as partitions bounds.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2018-12-17 [ca4103025] Fix tablespace handling for partitioned tables
--->
-
-       <para>
-        Allow <command>CREATE TABLE</command>'s tablespace specification
-        for a partitioned table to affect the tablespace of its children
-        (David Rowley, Álvaro Herrera)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-04-05 [959d00e9d] Use Append rather than MergeAppend for scanning ordered 
--->
-
-       <para>
-        Avoid sorting when partitions are already being scanned in the
-        necessary order (David Rowley)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Robert Haas <rhaas@postgresql.org>
-2019-03-07 [898e5e329] Allow ATTACH PARTITION with only ShareUpdateExclusiveLoc
--->
-
-       <para>
-        <link linkend="sql-altertable"><command>ATTACH
-        PARTITION</command></link> is now performed with reduced locking
-        requirements (Robert Haas)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-02-08 [3677a0b26] Add pg_partition_root to display top-most parent of a pa
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-03-04 [b96f6b194] pg_partition_ancestors
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-30 [d5eec4eef] Add pg_partition_tree to display information about parti
--->
-
-       <para>
-        Add partition introspection functions (Michaël Paquier, Álvaro
-        Herrera, Amit Langote)
-       </para>
-
-       <para>
-        New function <link
-        linkend="functions-info-partition"><function>pg_partition_root()</function></link>
-        returns the top-most parent of a partition tree, <link
-        linkend="functions-info-partition"><function>pg_partition_ancestors()</function></link>
-        reports all ancestors of a partition, and <link
-        linkend="functions-info-partition"><function>pg_partition_tree()</function></link>
-        displays information about partitions.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-12-18 [f94cec644] Include partitioned indexes to system view pg_indexes
--->
-
-       <para>
-        Include partitioned indexes in the system view <link
-        linkend="view-pg-indexes"><structname>pg_indexes</structname></link>
-        (Suraj Kharage)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-07 [1c5d9270e] psql \dP: list partitioned tables and indexes
--->
-
-       <para>
-        Add <application>psql</application> command <command>\dP</command>
-        to list partitioned tables and indexes (Pavel Stěhule)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2018-11-19 [d56e0fde8] psql: Describe partitioned tables/indexes as such
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-03-26 [1af25ca0c] Improve psql's \d display of foreign key constraints
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-17 [b036982db] psql: display tablespace for partitioned indexes
--->
-
-       <para>
-        Improve <application>psql</application> <command>\d</command>
-        and <command>\z</command> display of partitioned tables (Pavel
-        Stěhule, Michaël Paquier, Álvaro Herrera)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-02-11 [1d92a0c9f] Redesign the partition dependency mechanism.
--->
-
-       <para>
-        Fix bugs that could cause <command>ALTER TABLE DETACH
-        PARTITION</command> to not drop objects that should be dropped,
-        such as automatically-created child indexes (Tom Lane)
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-    <sect4>
-     <title>Indexes</title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Peter Geoghegan <pg@bowt.ie>
-2019-03-20 [dd299df81] Make heap TID a tiebreaker nbtree index column.
-Author: Peter Geoghegan <pg@bowt.ie>
-2019-03-20 [fab250243] Consider secondary factors during nbtree splits.
-Author: Peter Geoghegan <pg@bowt.ie>
-2019-03-25 [f21668f32] Add "split after new tuple" nbtree optimization.
--->
-
-       <para>
-        Improve performance and space utilization of btree indexes with
-        many duplicates (Peter Geoghegan, Heikki Linnakangas)
-       </para>
-
-       <para>
-        Previously, duplicate index entries were stored unordered within
-        their duplicate groups.  This caused overhead during index
-        inserts, wasted space due to excessive page splits, and reduced
-        <command>VACUUM</command>'s ability to recycle entire pages.
-        Duplicate index entries are now sorted in heap-storage order.
-       </para>
-
-       <para>
-        Indexes <application>pg_upgraded</application> from previous
-        releases will not have these benefits.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-see commits above
--->
-
-       <para>
-        Allow multi-column btree indexes to be smaller (Peter Geoghegan,
-        Heikki Linnakangas)
-       </para>
-
-       <para>
-        Internal pages and min/max leaf page indicators now only store
-        index keys until the change key, rather than all indexed keys.
-        This also improves the locality of index access.
-       </para>
-
-       <para>
-        Indexes <application>pg_upgraded</application> from previous
-        releases will not have these benefits.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2018-07-28 [d2086b08b] Reduce path length for locking leaf B-tree pages during 
--->
-
-       <para>
-        Improve speed of btree index insertions by reducing locking
-        overhead (Alexander Korotkov)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2019-03-10 [f2e403803] Support for INCLUDE attributes in GiST indexes
--->
-
-       <para>
-        Support <link
-        linkend="sql-createindex"><literal>INCLUDE</literal></link> columns
-        in <link linkend="gist">GiST</link> indexes (Andrey Borodin)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2018-09-19 [2a6368343] Add support for nearest-neighbor (KNN) searches to SP-Gi
--->
-
-       <para>
-        Add support for nearest-neighbor (<acronym>KNN</acronym>) searches
-        of <link linkend="spgist">SP-GiST</link> indexes (Nikita Glukhov,
-        Alexander Korotkov, Vlad Sterzhanov)
-       </para>
-
-      </listitem>
-
-      <listitem>
-<!--
-Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
-2019-04-03 [9155580fd] Generate less WAL during GiST, GIN and SP-GiST index bui
--->
-
-       <para>
-        Reduce the <acronym>WAL</acronym> write overhead
-        of <acronym>GiST</acronym>, <acronym>GIN</acronym> and
-        <acronym>SP-GiST</acronym> index creation (Anastasia Lubennikova,
-        Andrey V. Lepikhov)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-03 [80b9e9c46] Improve performance of index-only scans with many index 
--->
-
-       <para>
-        Allow index-only scans to be more efficient on indexes with many
-        columns (Konstantin Knizhnik)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
-2019-03-05 [fe280694d] Scan GiST indexes in physical order during VACUUM.
--->
-
-       <para>
-        Improve the performance of vacuum scans of GiST indexes (Andrey
-        Borodin, Konstantin Kuznetsov, Heikki Linnakangas)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
-2019-03-22 [7df159a62] Delete empty pages during GiST VACUUM.
--->
-
-       <para>
-        Delete empty leaf pages during <acronym>GiST</acronym>
-        <command>VACUUM</command> (Andrey Borodin)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-14 [1b5d797cd] Lower lock level for renaming indexes
--->
-
-       <para>
-        Reduce locking requirements for index renaming (Peter Eisentraut)
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-    <sect4>
-     <title>Optimizer</title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2019-03-27 [7300a6995] Add support for multivariate MCV lists
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2019-03-27 [a63b29a1d] Minor improvements for the multivariate MCV lists
--->
-
-       <para>
-        Allow <xref linkend="sql-createstatistics"/> to create
-        most-common-value statistics for multiple columns (Tomas Vondra)
-       </para>
-
-       <para>
-        This improves optimization for columns with non-uniform
-        distributions that often appear in <literal>WHERE</literal>
-        clauses.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-02-16 [608b167f9] Allow user control of CTE materialization, and change th
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-04-09 [947613127] Prevent inlining of multiply-referenced CTEs with outer 
--->
-
-       <para>
-        Allow <link linkend="queries-with">common table expressions</link>
-        (<acronym>CTE</acronym>) to be inlined in later parts of the query
-        (Andreas Karlsson, Andrew Gierth, David Fetter, Tom Lane)
-       </para>
-
-       <para>
-        Specifically, <acronym>CTE</acronym>s are inlined
-        if they are not recursive and are referenced only
-        once later in the query.  Inlining can be prevented by
-        specifying <literal>MATERIALIZED</literal>, and forced by
-        specifying <literal>NOT MATERIALIZED</literal>.  Previously,
-        <acronym>CTE</acronym>s were never inlined and were always
-        evaluated before the rest of the query.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-07-16 [f7cb2842b] Add plan_cache_mode setting
--->
-
-       <para>
-        Allow control over when generic plans are used for prepared
-        statements (Pavel Stěhule)
-       </para>
-
-       <para>
-        This is controlled by the <xref linkend="guc-plan-cache_mode"/>
-        server variable.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-30 [b5415e3c2] Support parameterized TidPaths.
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-30 [0a6ea4001] Add a hash opclass for type "tid".
--->
-
-       <para>
-        Improve optimization of self-joins involving columns of type tid (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-25 [8edd0e794] Suppress Append and MergeAppend plan nodes that have a s
--->
-
-       <para>
-        Improve optimization of partition and <literal>UNION ALL</literal>
-        queries that have only a single child (David Rowley)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-13 [04fe805a1] Drop no-op CoerceToDomain nodes from expressions at plan
--->
-
-       <para>
-        Improve optimizations for <link
-        linkend="sql-createdomain">domains</link> that have no check
-        constraints (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-30 [6f19a8c41] Teach eval_const_expressions to constant-fold LEAST/GREA
--->
-
-       <para>
-        Inline calls to <link
-        linkend="functions-greatest-least"><literal>LEAST</literal></link>
-        and <literal>GREATEST</literal> to improve optimization (Vik
-        Fearing)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-02-20 [e04a3905e] Improve planner's understanding of strictness of type co
--->
-
-       <para>
-        Allow <literal>IS NOT NULL</literal> with mis-matching types to
-        use partial indexes more frequently (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-01 [65ce07e02] Teach optimizer's predtest.c more things about ScalarArr
--->
-
-       <para>
-        Allow IN comparisons with arrays to use <literal>IS NOT
-        NULL</literal> partial indexes more frequently (James Coleman)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-14 [5e0928005] Make pg_statistic and related code account more honestly
--->
-
-       <para>
-        Store statistics using the collation defined for each column
-        (Tom Lane)
-       </para>
-
-       <para>
-        Previously, the default collation was used for all statistics
-        storage.  This potentially gives better optimizer behavior for
-        columns with non-default collations.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-25 [f7111f72d] Improve planner's selectivity estimates for inequalities
--->
-
-       <para>
-        Improve optimizer estimates for <link
-        linkend="datatype-oid"><type>tid</type></link> inequality
-        comparisons (Edmund Horner)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-07-11 [39a96512b] Mark built-in btree comparison functions as leakproof wh
--->
-
-       <para>
-        Fix the btree leakproof designation of some functions (Tom Lane)
-       </para>
-
-       <para>
-        This allows for more complex optimizations.
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-    <sect4>
-     <title>General Performance</title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Bruce Momjian <bruce@momjian.us>
-2018-09-21 [1f7fc7670] doc:  JIT is enabled by default in PG 12
--->
-
-       <para>
-        Enable <link linkend="jit">Just-in-Time</link>
-        (<acronym>JIT</acronym>) compilation by default (Andres Freund)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2019-01-29 [36a1281f8] Separate per-batch and per-tuple memory contexts in COPY
-Author: Andres Freund <andres@anarazel.de>
-2019-01-26 [a9c35cf85] Change function call information to be variable length.
--->
-
-       <para>
-        Greatly reduce memory consumption of <xref linkend="sql-copy"/>
-        and function calls (Andres Freund, Tomas Vondra, Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-01-06 [afb0d0712] Replace the data structure used for keyword lookup.
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-01-09 [c64d0cd5c] Use perfect hashing, instead of binary search, for keywo
--->
-
-       <para>
-        Speed up keyword lookup (John Naylor, Joerg Sonnenberger, Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
-2019-01-25 [9556aa01c] Use single-byte Boyer-Moore-Horspool search even with mu
--->
-
-       <para>
-        Improve search performance for multi-byte characters (Heikki
-        Linnakangas)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Stephen Frost <sfrost@snowman.net>
-2019-04-02 [4d0e994ee] Add support for partial TOAST decompression
--->
-
-       <para>
-        Allow <link linkend="storage-toast"><literal>TOAST</literal></link>
-        values to be minimally decompressed (Paul Ramsey)
-       </para>
-
-       <para>
-        This is useful for routines that only look at values at the start
-        of the <literal>TOAST</literal> field.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Robert Haas <rhaas@postgresql.org>
-2019-03-13 [bbb96c370] Allow ALTER TABLE .. SET NOT NULL to skip provably unnec
--->
-
-       <para>
-        Allow <link linkend="sql-altertable"><command>ALTER TABLE .. SET
-        NOT NULL</command></link> to avoid unnecessary checking (Sergei
-        Kornilov)
-       </para>
-
-       <para>
-        This can happen if column constraints already prevent nulls.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Noah Misch <noah@leadboat.com>
-2019-03-08 [3c5926301] Avoid some table rewrites for ALTER TABLE .. SET DATA TY
--->
-
-       <para>
-        Allow <command>ALTER TABLE .. SET DATA TYPE</command>
-        <type>timestamp/timestamptz</type> to avoid a table rewrite when
-        the session time zone is <acronym>UTC</acronym> (Noah Misch)
-       </para>
-
-       <para>
-        In the <acronym>UTC</acronym> time zone, the data types are
-        binary compatible.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-07-22 [86eaf208e] Hand code string to integer conversion for performance.
--->
-
-       <para>
-        Improve speed in converting strings to
-        <type>int2</type>/<type>int4</type> integers (Andres Freund)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2019-03-15 [bb16aba50] Enable parallel query with SERIALIZABLE isolation.
--->
-
-       <para>
-        Allow parallelized queries when in <link
-        linkend="sql-set-transaction"><literal>SERIALIZABLE</literal></link>
-        isolation mode (Thomas Munro)
-       </para>
-
-       <para>
-        Previously, parallelism was disabled when in this mode.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2018-11-07 [3fd2a7932] Provide pg_pread() and pg_pwrite() for random I/O.
-Author: Thomas Munro <tmunro@postgresql.org>
-2018-11-07 [c24dcd0cf] Use pg_pread() and pg_pwrite() for data files and WAL.
--->
-
-       <para>
-        Use <function>pread()</function> and <function>pwrite()</function>
-        for random I/O (Oskari Saarenmaa, Thomas Munro)
-       </para>
-
-       <para>
-        This reduces the number of system calls required.
-
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2018-07-24 [1bc180cd2] Use setproctitle_fast() to update the ps status, if avai
--->
-
-       <para>
-        Improve the speed of setting the <link
-        linkend="guc-update-process-title">process title</link> on
-        <systemitem class="osname">FreeBSD</systemitem> (Thomas Munro)
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-    <sect4>
-     <title>Monitoring</title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2018-11-29 [88bdbd3f7] Add log_statement_sample_rate parameter
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-03 [799e22034] Log all statements from a sample of transactions
--->
-
-       <para>
-        Allow logging of only a percentage of statements and transactions
-        meeting <xref linkend="guc-log-min-duration-statement"/> criteria
-        (Adrien Nayrat)
-       </para>
-
-       <para>
-        The parameters <xref linkend="guc-log-statement-sample-rate"/>
-        and <xref linkend="guc-log-transaction-sample-rate"/> control this.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-02 [ab0dfc961] Report progress of CREATE INDEX operations
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-04-07 [03f9e5cba] Report progress of REINDEX operations
--->
-
-       <para>
-        Report progress of <command>CREATE INDEX</command> and
-        <command>REINDEX</command> operations (Álvaro Herrera, Peter
-        Eisentraut)
-       </para>
-
-       <para>
-        Progress is reported in the <link
-        linkend="progress-reporting"><structname>pg_stat_progress_create_index</structname></link>
-        system view
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Robert Haas <rhaas@postgresql.org>
-2019-03-25 [6f97457e0] Add progress reporting for CLUSTER and VACUUM FULL.
--->
-
-       <para>
-        Add progress reporting to <command>CLUSTER</command> and
-        <command>VACUUM FULL</command> (Tatsuro Yamada)
-       </para>
-
-       <para>
-        Progress is reported in the <link
-        linkend="vacuum-progress-reporting"><structname>pg_stat_progress_cluster</structname></link>
-        system view.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-04-02 [280e5f140] Add progress reporting to pg_checksums
--->
-
-       <para>
-        Add progress reporting to <xref linkend="app-pgchecksums"/>
-        (Michael Banck, Bernd Helmle)
-       </para>
-
-       <para>
-        This is enabled with the option <option>--progress</option>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Magnus Hagander <magnus@hagander.net>
-2019-03-09 [6b9e875f7] Track block level checksum failures in pg_stat_database
--->
-
-       <para>
-        Add counter of checksum failures to
-        <structname>pg_stat_database</structname> (Magnus Hagander)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Magnus Hagander <magnus@hagander.net>
-2019-04-12 [77bd49adb] Show shared object statistics in pg_stat_database
--->
-
-       <para>
-        Add tracking of global objects in system view
-        <structname>pg_stat_database</structname> (Julien Rouhaud)
-       </para>
-
-       <para>
-        Global objects have a <link
-        linkend="pg-stat-database-view"><structname>pg_stat_database</structname></link>.<structfield>datoid</structfield>
-        value of zero.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-09 [c48101620] Add pg_ls_archive_statusdir function
--->
-
-       <para>
-        Add the ability to list the contents of the archive directory
-        (Christoph Moench-Tegeder)
-       </para>
-
-       <para>
-        The function is <link
-        linkend="functions-admin-genfile-table"><function>pg_ls_archive_statusdir()</function></link>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-05 [9cd92d1a3] Add pg_ls_tmpdir function
--->
-
-       <para>
-        Add the ability to list the contents of temporary directories
-        (Nathan Bossart)
-       </para>
-
-       <para>
-        The function, <link
-        linkend="functions-admin-genfile-table"><function>pg_ls_tmpdir()</function></link>,
-        optionally allows specification of a tablespace.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-02-01 [f60a0e967] Add more columns to pg_stat_ssl
--->
-
-       <para>
-        Add information about the client certificate to the system view
-        <structname>pg_stat_ssl</structname> (Peter Eisentraut)
-       </para>
-
-       <para>
-        The new columns are <structfield>client_serial</structfield>
-        and <structfield>issuer_dn</structfield>.  Column
-        <structfield>clientdn</structfield> has been renamed to
-        <structfield>client_dn</structfield>, for clarity.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-02-21 [f9692a769] Hide other user's pg_stat_ssl rows
--->
-
-       <para>
-        Restrict visibility of rows in <link
-        linkend="pg-stat-ssl-view"><structname>pg_stat_ssl</structname></link>
-        by unprivileged users (Peter Eisentraut)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-01-30 [689d15e95] Log PostgreSQL version number on startup
--->
-
-       <para>
-        Add the version number to the server startup log message
-        (Christoph Berg)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Andrew Dunstan <andrew@dunslane.net>
-2019-03-06 [342cb650e] Don't log incomplete startup packet if it's empty
--->
-
-       <para>
-        Prevent logging of empty "incomplete" startup packets (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Stephen Frost <sfrost@snowman.net>
-2018-09-28 [8bddc8640] Add application_name to connection authorized msg
--->
-
-       <para>
-        Unconditionally include <xref linkend="guc-application-name"/>
-        in server log authentication messages (Don Seiler)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-02-27 [6ae578a91] Set fallback_application_name for a walreceiver to clust
--->
-
-       <para>
-        Have the walreceiver set its application name to the cluster name,
-        if set (Peter Eisentraut)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-12-09 [7fee252f6] Add timestamp of last received message from standby to p
--->
-
-       <para>
-        Add the timestamp of the last received standby message to <link
-        linkend="pg-stat-replication-view"><structname>pg_stat_replication</structname></link>
-        (Lim MyungKyu)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-07-02 [c55de5e51] Add wait event for fsync of WAL segments
--->
-
-       <para>
-        Add <link linkend="wait-event-table">wait event</link> for fsync
-        of <acronym>WAL</acronym> segments (Konstantin Knizhnik)
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-     <sect5>
-      <title><link linkend="infoschema-tables">Information Schema</link></title>
-
-      <itemizedlist>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-20 [7c15cef86] Base information_schema.sql_identifier domain on name, n
--->
-
-       <para>
-        Allow more use of indexes for text comparisons with
-        <structname>information_schema</structname> columns (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-18 [6b0faf723] Make collation-aware system catalog columns use "C" coll
--->
-
-       <para>
-        Use "C" collation for <structname>information_schema</structname>
-        and the system tables (Tom Lane)
-       </para>
-
-       <para>
-        This will produce more consistent behavior in databases with
-        different collations, but will also cause these tables to produce
-        results in "C" collation ordering, rather than the default
-        collation for the database.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-20 [5bbee34d9] Avoid producing over-length specific_name outputs in inf
--->
-
-       <para>
-        Force <structname>information_schema</structname> outputs to honor
-        the system-defined maximum 63-byte identifier length (Tom Lane)
-       </para>
-      </listitem>
-
-      </itemizedlist>
-
-     </sect5>
-    </sect4>
-
-    <sect4>
-     <title><acronym>Authentication</acronym></title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Stephen Frost <sfrost@snowman.net>
-2019-04-03 [b0b39f72b] GSSAPI encryption support
--->
-
-       <para>
-        Add <link linkend="gssapi-auth"><acronym>GSSAPI</acronym></link>
-        client and server-side encryption support (Robbie Harwood,
-        Stephen Frost)
-       </para>
-
-       <para>
-        Add <link
-        linkend="auth-pg-hba-conf"><filename>pg_hba.conf</filename></link>
-        <link
-        linkend="auth-pg-hba-conf"><literal>hostgssenc</literal></link>
-        and <literal>hostnogssenc</literal> record types.  This would
-        typically use the <literal>gss</literal> authentication method.
-        This also adds a libpq <xref linkend="libpq-connect-gssencmode"/>
-        option, and a <xref linkend="pg-stat-gssapi-view"/> system view.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Magnus Hagander <magnus@hagander.net>
-2019-03-09 [0516c61b7] Add new clientcert hba option verify-full
--->
-
-       <para>
-        Allow the <link
-        linkend="auth-cert"><literal>clientcert</literal></link>
-        <filename>pg_hba.conf</filename> option to check that the database
-        user name matches the certificate common name (Julian Markwort,
-        Marius Timmer)
-       </para>
-
-       <para>
-        The new check is enabled with
-        <literal>clientcert=verify-full</literal>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2019-03-21 [0f086f84a] Add DNS SRV support for LDAP server discovery.
--->
-
-       <para>
-        Allow discovery of the <link
-        linkend="auth-ldap"><acronym>LDAP</acronym></link> server using
-        <acronym>DNS SRV</acronym> records (Thomas Munro)
-       </para>
-
-       <para>
-        This avoids the requirement of specifying
-        <literal>ldapserver</literal>, and is only supported if
-        <productname>PostgreSQL</productname> is compiled with
-        <productname>OpenLDAP</productname>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-08-10 [f841ceb26] Improve TRUNCATE by avoiding early lock queue
--->
-
-       <para>
-        Prevent <xref linkend="sql-truncate"/> from requesting a lock on
-        tables for which the user lacks permission (Michaël Paquier)
-       </para>
-
-       <para>
-        This prevents unauthorized locking, which could interfere with
-        user queries.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-08-27 [a556549d7] Improve VACUUM and ANALYZE by avoiding early lock queue
--->
-
-       <para>
-        Prevent <command>VACUUM</command> and <command>ANALYZE</command>
-        from requesting a lock on tables for which it lacks permission
-        (Michaël Paquier)
-       </para>
-
-       <para>
-        This prevents unauthorized locking, which could interfere with
-        user queries.
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-    <sect4>
-     <title>Server Configuration</title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-03-23 [ed308d783] Add options to enable and disable checksums in pg_checks
--->
-
-       <para>
-        Add ability to enable/disable cluster checksums using <xref
-        linkend="app-pgchecksums"/> (Michael Banck, Michaël Paquier)
-       </para>
-
-       <para>
-        The cluster must be offline for these operations.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-10 [cbccac371] Reduce the default value of autovacuum_vacuum_cost_delay
--->
-
-       <para>
-        Reduce the default value of <xref
-        linkend="guc-autovacuum-vacuum-cost-delay"/> to 2ms (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-10 [caf626b2c] Convert [autovacuum_]vacuum_cost_delay into floating-poi
--->
-
-       <para>
-        Allow <xref linkend="guc-vacuum-cost-delay"/> to specify
-        sub-millisecond delays (Tom Lane)
-       </para>
-
-       <para>
-        Floating-point values can also now be specified.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-10 [caf626b2c] Convert [autovacuum_]vacuum_cost_delay into floating-poi
--->
-
-       <para>
-        Allow time-based server variables to use <link
-        linkend="config-setting">micro-seconds</link> (us) (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-11 [1a83a80a2] Allow fractional input values for integer GUCs, and impr
--->
-
-       <para>
-        Allow fractional input for integer server variables (Tom Lane)
-       </para>
-
-       <para>
-        For example, <command>SET work_mem = '30.1GB'</command>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-10 [caf626b2c] Convert [autovacuum_]vacuum_cost_delay into floating-poi
--->
-
-       <para>
-        Allow units to be specified for floating-point server variables
-        (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2019-04-02 [475861b26] Add wal_recycle and wal_init_zero GUCs.
--->
-
-       <para>
-        Add <xref linkend="guc-wal-recycle"/> and <xref
-        linkend="guc-wal-init-zero"/> server variables to avoid
-        <acronym>WAL</acronym> file recycling (Jerry Jelinek)
-       </para>
-
-       <para>
-        This can be beneficial on copy-on-write file systems like
-        <productname>ZFS</productname>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-04-06 [249d64999] Add support TCP user timeout in libpq and the backend se
--->
-
-       <para>
-        Add parameter to control the server <acronym>TCP</acronym> timeout
-        (Ryohei Nagaura)
-       </para>
-
-       <para>
-        The parameter is <xref linkend="guc-tcp-user-timeout"/>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-20 [e73e67c71] Add settings to control SSL/TLS protocol version
--->
-
-       <para>
-        Allow control of the minimum and maximum <acronym>SSL</acronym>>
-        protocol versions (Peter Eisentraut)
-       </para>
-
-       <para>
-        The server settings are <xref
-        linkend="guc-ssl-min-protocol-version"/> and <xref
-        linkend="guc-ssl-max-protocol-version"/>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-07-30 [98efa76fe] Add ssl_library preset parameter
--->
-
-       <para>
-        Add server variable <xref linkend="guc-ssl-library"/> to report
-        the <acronym>SSL</acronym> library version used by the server
-        (Peter Eisentraut)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2019-02-03 [f1bebef60] Add shared_memory_type GUC.
--->
-
-       <para>
-        Add server variable to control the type of shared memory to use
-        (Andres Freund)
-       </para>
-
-       <para>
-        The variable is <xref linkend="guc-shared-memory-type"/>.
-        Its purpose is to allow selection of <productname>System
-        V</productname> shared memory, if desired.
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-   </sect3>
-
-   <sect3>
-    <title>Streaming Replication and Recovery</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-02-07 [13b89f96d] Allow some recovery parameters to be changed with reload
--->
-
-      <para>
-       Allow some recovery parameters to be changed with reload (Peter
-       Eisentraut)
-      </para>
-
-      <para>
-       These parameters are <xref linkend="guc-archive-cleanup-command"/>,
-       <xref linkend="guc-promote-trigger-file"/>, <xref
-       linkend="guc-recovery-end-command"/>, and <xref
-       linkend="guc-recovery-min-apply-delay"/>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-09-22 [db361db2f] Make GUC wal_sender_timeout user-settable
--->
-
-      <para>
-       Allow the streaming replication timeout (<xref
-       linkend="guc-wal-sender-timeout"/>) to be set per connection
-       (Tsunakawa Takayuki)
-      </para>
-
-      <para>
-       Previously, this could only be set cluster-wide.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-25 [10074651e] Add pg_promote function
-Author: Michael Paquier <michael@paquier.xyz>
-2018-11-06 [8f045e242] Switch pg_promote to be parallel-safe
--->
-
-      <para>
-       Add function <link
-       linkend="functions-recovery-control"><function>pg_promote()</function></link>
-       to promote standbys to primaries (Laurenz Albe, Michaël Paquier)
-      </para>
-
-      <para>
-       Previously, this operation was only possible by using <xref
-       linkend="app-pg-ctl"/> or creating a trigger file.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-04-05 [9f06d79ef] Add facility to copy replication slots
--->
-
-      <para>
-       Allow replication slots to be copied (Masahiko Sawada)
-      </para>
-
-      <para>
-       The functions are <link
-       linkend="functions-replication-table"><function>pg_copy_physical_replication_slot()</function></link>
-       and <function>pg_copy_logical_replication_slot()</function>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-02-12 [ea92368cd] Move max_wal_senders out of max_connections for connecti
--->
-
-      <para>
-       Have <xref linkend="guc-max-wal-senders"/> not count as part of
-       <xref linkend="guc-max-connections"/> (Alexander Kukushkin)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-01-11 [ff8530605] Add value 'current' for recovery_target_timeline
--->
-
-      <para>
-       Add an explicit value of <literal>current</literal> for <xref
-       linkend="guc-recovery-target-timeline"/> (Peter Eisentraut)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-09-07 [8582b4d04] Improve handling of corrupted two-phase state files at r
--->
-
-      <para>
-       Have recovery fail if a <link
-       linkend="sql-prepare-transaction">two-phase transaction</link>
-       status file is corrupt (Michaël Paquier)
-      </para>
-
-      <para>
-       Previously, only a warning was issued in the logs and recovery
-       continued.
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Utility Commands</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-29 [5dc92b844] REINDEX CONCURRENTLY
--->
-
-      <para>
-       Add <xref linkend="sql-reindex"/> <literal>CONCURRENTLY</literal>
-       to allow reindexing concurrently (Michaël Paquier, Andreas
-       Karlsson, Peter Eisentraut)
-      </para>
-
-      <para>
-       This is also controlled by the <xref linkend="app-reindexdb"/>
-       <option>--concurrently</option> option.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-30 [fc22b6623] Generated columns
--->
-
-      <para>
-       Add support for <link linkend="sql-createtable">generated
-       columns</link> (Peter Eisentraut)
-      </para>
-
-      <para>
-       The content of generated columns are computed from expressions
-       (including references to other columns in the same table)
-       rather than being specified by <command>INSERT</command> or
-       <command>UPDATE</command> commands.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2019-01-20 [31f381740] Allow COPY FROM to filter data using WHERE conditions
--->
-
-      <para>
-       Add a <literal>WHERE</literal> clause to <command>COPY
-       FROM</command> which controls which rows are output (Surafel
-       Temesgen)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2018-10-09 [212fab992] Relax transactional restrictions on ALTER TYPE ... ADD V
--->
-
-      <para>
-       Allow enumerated values to be added in more transaction types
-       (Andrew Dunstan, Tom Lane, Thomas Munro)
-      </para>
-
-      <para>
-       Previously, <link linkend="sql-altertype"><command>ALTER
-       TYPE ... ADD VALUE</command></link> could only be called in
-       a transaction that created the enumerated type.  Now, the only
-       restriction is that the new enumerated value cannot be referenced
-       until the transaction commits.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-24 [280a408b4] Transaction chaining
--->
-
-      <para>
-       Add command to end a transaction and start a new one (Peter
-       Eisentraut)
-      </para>
-
-      <para>
-       The commands are <link linkend="sql-commit"><command>COMMIT AND
-       CHAIN</command></link> and <command>ROLLBACK AND CHAIN</command>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-22 [5e1963fb7] Collations with nondeterministic comparison
--->
-
-      <para>
-       Allow the creation of <link
-       linkend="sql-createcollation">collations</link> that report
-       string equality for strings that are not byte-wise equal (Peter
-       Eisentraut)
-      </para>
-
-      <para>
-       This allows case and accent-agnostic equality comparisons using
-       "nondeterministic" collations.  This is only supported for
-       <acronym>ICU</acronym> collations.  MENTION ITS AFFECT ON ORDERING?
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Fujii Masao <fujii@postgresql.org>
-2019-04-08 [119dcfad9] Add vacuum_truncate reloption.
-Author: Fujii Masao <fujii@postgresql.org>
-2019-05-08 [b84dbc8eb] Add TRUNCATE parameter to VACUUM.
--->
-
-      <para>
-       Add <xref linkend="sql-vacuum"/> and <command>CREATE
-       TABLE</command> options to prevent <command>VACUUM</command>
-       from truncating trailing empty pages (Tsunakawa Takayuki)
-      </para>
-
-      <para>
-       The options are <varname>vacuum_truncate</varname> and
-       <varname>toast.vacuum_truncate</varname>.  This reduces vacuum
-       locking requirements.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Robert Haas <rhaas@postgresql.org>
-2019-04-04 [a96c41fee] Allow VACUUM to be run with index cleanup disabled.
--->
-
-      <para>
-       Allow vacuum to avoid index cleanup with the
-       <literal>INDEX_CLEANUP</literal> option (Masahiko Sawada)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-04 [803b1301e] Add option SKIP_LOCKED to VACUUM and ANALYZE
--->
-
-      <para>
-       Add the ability to skip <command>VACUUM</command> and
-       <command>ANALYZE</command> operations on tables that cannot be
-       immediately locked (Nathan Bossart)
-      </para>
-
-      <para>
-       This option is called <literal>SKIP_LOCKED</literal>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Robert Haas <rhaas@postgresql.org>
-2019-03-29 [41b54ba78] Allow existing VACUUM options to take a Boolean argument
--->
-
-      <para>
-       Allow <command>VACUUM</command> and <command>ANALYZE</command>
-       to take optional boolean argument specifications (Masahiko Sawada)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2019-04-04 [ea569d64a] Add SETTINGS option to EXPLAIN, to print modified settin
--->
-
-      <para>
-       Add <xref linkend="sql-explain"/> option
-       <literal>SETTINGS</literal> to output non-default optimizer
-       settings (Tomas Vondra)
-      </para>
-
-      <para>
-       This can also be output in auto-explain via <xref
-       linkend="auto-explain"/>.<literal>log_settings</literal>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Andrew Gierth <rhodiumtoad@postgresql.org>
-2019-03-19 [01bde4fa4] Implement OR REPLACE option for CREATE AGGREGATE.
--->
-
-      <para>
-       Allow aggregates to be replaced (Andrew Gierth)
-      </para>
-
-      <para>
-       The command is <link linkend="sql-createaggregate"><command>CREATE
-       OR REPLACE AGGREGATE</command></link>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-19 [590a87025] Ignore attempts to add TOAST table to shared or catalog 
--->
-
-      <para>
-       Allow modifications of system table options using <xref
-       linkend="sql-altertable"/> (Peter Eisentraut)
-      </para>
-
-      <para>
-       This allows modifications of <literal>reloptions</literal> and
-       autovacuum settings.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-01-30 [5f5c01459] Allow RECORD and RECORD[] to be specified in function co
--->
-
-      <para>
-       Allow <type>RECORD</type> and <type>RECORD[]</type> to be used
-       as column types in a query's column definition list for a <link
-       linkend="sql-createfunction">table function</link> that is declared
-       to return <type>RECORD</type> (Elvis Pranskevichus)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-13 [f177660ab] Include all columns in default names for foreign key con
--->
-
-      <para>
-       Use all column names when creating default foreign key constraint
-       names (Peter Eisentraut)
-      </para>
-
-      <para>
-       Previously, only the first column name was used.
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Data Types</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-24 [fd582317e] Sync our Snowball stemmer dictionaries with current upst
--->
-
-      <para>
-       Update Snowball stemmer dictionaries with support for new languages
-       (Arthur Zakirov)
-      </para>
-
-      <para>
-       This adds stemming for Arabic, Indonesian, Irish, Lithuanian, Nepali,
-       and Tami to <link linkend="textsearch">full text search</link>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-17 [b8f9a2a69] Add support for collation attributes on older ICU versio
--->
-
-      <para>
-       Add support for <acronym>ICU</acronym> collation customization
-       attributes (Peter Eisentraut)
-      </para>
-
-      <para>
-       This allow modification of the collation rules.  DETAILS?
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-19 [2ece7c07d] Add text-vs-name cross-type operators, and unify name_op
--->
-
-      <para>
-       Allow data type <link linkend="datatype-oid">name</link> to more
-       seamlessly be compared to other text types (Tom Lane)
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Functions</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2019-03-16 [72b646033] Partial implementation of SQL/JSON path language
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2019-03-16 [16d489b0f] Numeric error suppression in jsonpath
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2019-04-01 [0a02e2ae0] GIN support for @@ and @? jsonpath operators
--->
-
-      <para>
-       Add support for the <acronym>SQL/JSON</acronym> <link
-       linkend="functions-json-processing-table">path</link> language
-       (Nikita Glukhov, Teodor Sigaev, Alexander Korotkov, Oleg Bartunov,
-       Liudmila Mantrova)
-      </para>
-
-      <para>
-       This allows execution of complex queries on <type>JSON</type>
-       values using an <acronym>SQL</acronym>-standard language.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-03-12 [f1d85aa98] Add support for hyperbolic functions, as well as log10()
--->
-
-      <para>
-       Add support for <link linkend="functions-math-hyp-table">hyperbolic
-       functions</link> (Lætitia Avrot)
-      </para>
-
-      <para>
-       Also add <function>log10()</function> as alias for
-       <function>log()</function>, for standards compliance.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Dean Rasheed <dean.a.rasheed@gmail.com>
-2018-10-06 [e954a727f] Improve the accuracy of floating point statistical aggre
--->
-      <para>
-       Improve the accuracy of statistical aggregates like <link
-       linkend="functions-aggregate-statistics-table"><function>variance()</function></link>
-       by using more precise algorithms (Dean Rasheed)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-14 [600b04d6b] Add a timezone-specific variant of date_trunc().
--->
-
-      <para>
-       Allow <link
-       linkend="functions-datetime-table"><function>date_trunc()</function></link>
-       to have an additional argument to control the time zone (Vik
-       Fearing, Tom Lane)
-      </para>
-
-      <para>
-       This is faster and simpler than using the <literal>AT TIME
-       ZONE</literal> clause.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2018-09-09 [cf9846724] Improve behavior of to_timestamp()/to_date() functions
--->
-
-      <para>
-       Adjust <link
-       linkend="functions-formatting-table"><function>to_timestamp()</function></link>/<function>to_date()</function>
-       functions to be more forgiving of template mismatches (Artur
-       Zakirov, Alexander Korotkov, Liudmila Mantrova)
-      </para>
-
-      <para>
-       This new behavior more closely matches the
-       <productname>Oracle</productname> functions of the same name.
-       DETAILS?
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-03-07 [251cf2e27] Fix minor deficiencies in XMLTABLE, xpath(), xmlexists()
--->
-
-      <para>
-       Improve node detection and escaping of <link
-       linkend="functions-xml"><acronym>XML</acronym> functions</link>
-       (Pavel Stěhule, Markus Winand, Chapman Flack)
-      </para>
-
-      <para>
-       Specifically, in <literal>XMLTABLE</literal>,
-       <function>xpath()</function>, and <function>xmlexists()</function>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-03-07 [eaaa5986a] Fix the BY {REF,VALUE} clause of XMLEXISTS/XMLTABLE
--->
-
-      <para>
-       Allow the <literal>XML BY VALUE</literal> clause (Chapman Flack)
-      </para>
-
-      <para>
-       The clause has no effect.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-03-27 [5bde1651b] Switch function current_schema[s]() to be parallel-unsaf
--->
-
-      <para>
-       Prevent <link
-       linkend="functions-info-session-table"><function>current_schema()</function></link>
-       and <function>current_schemas()</function> from being run by
-       parallel workers (Michaël Paquier)
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title><link linkend="plpgsql">PL/pgSQL</link></title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-01-04 [4879a5172] Support plpgsql variable names that conflict with unrese
--->
-
-      <para>
-       Allow commands and variables with the same name as commands to
-       be used in the same PL/pgSQL function (Tom Lane)
-      </para>
-
-      <para>
-       For example, allow a variable called comment to exist in the same
-       function that calls the comment <acronym>SQL</acronym> command.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tomas Vondra <tomas.vondra@postgresql.org>
-2018-07-25 [167075be3] Add strict_multi_assignment and too_many_rows plpgsql ch
--->
-
-      <para>
-       Add new optional warning and error checks to PL/pgSQL (Pavel
-       Stěhule)
-      </para>
-
-      <para>
-       The new checks allow for run-time validation of
-       <literal>INTO</literal> column counts and single-row results.
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Client Interfaces</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Michael Meskes <meskes@postgresql.org>
-2019-02-18 [050710b36] Add bytea datatype to ECPG.
--->
-
-      <para>
-       Allow <xref linkend="app-ecpg"/> to create variables of data type
-       bytea (Ryo Matsumura)
-      </para>
-
-      <para>
-       This allows to interaction with <type>bytea</type> data directly,
-       rather than using a binary encoding.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Meskes <meskes@postgresql.org>
-2019-02-16 [bd7c95f0c] Add DECLARE STATEMENT support to ECPG.
--->
-
-      <para>
-       Add <command>DECLARE STATEMENT</command> support to
-       <productname>ECPG</productname> (Takeshi Ideriha, Hayato Kuroda)
-      </para>
-
-      <para>
-       This allows statements to be associated with named connections,
-       so future operations like cursors don't need to re-reference the
-       connection name.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-04-06 [249d64999] Add support TCP user timeout in libpq and the backend se
--->
-
-      <para>
-       Add parameter to control libpq's <acronym>TCP</acronym> timeout
-       (Ryohei Nagaura)
-      </para>
-
-      <para>
-       The parameter is <xref linkend="libpq-tcp-user-timeout"/>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-04-04 [7bac3acab] Add a "SQLSTATE-only" error verbosity option to libpq an
--->
-
-      <para>
-       Allow libpq to report the <literal>SQLSTATE</literal> to output
-       only this value (Didier Gautheron)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-11 [2970afa6c] Add PQresultMemorySize function to report allocated size
--->
-
-      <para>
-       Add libpq function to report the memory size of the query result
-       (Lars Kanis, Tom Lane)
-      </para>
-
-      <para>
-       The function is <link
-       linkend="libpq-pqresultmemorysize"><function>PQresultMemorySize()</function></link>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-09-07 [1fea1e325] libpq: Change "options" dispchar to normal
--->
-
-      <para>
-       Remove the no-display/debug flag from the libpq
-       <literal>options</literal> parameter (Peter Eisentraut)
-      </para>
-
-      <para>
-       This allows the option to be used by
-       <application>postgres_fdw</application>.
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Client Applications</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-01-31 [00d1e88d3] Add - -min-xid-age and - -min-mxid-age options to vacuumdb
--->
-
-      <para>
-       Allow <xref linkend="app-vacuumdb"/> to select tables for vacuum
-       based on their wraparound horizon (Nathan Bossart)
-      </para>
-
-      <para>
-       The options are <option>--min-xid-age</option> and
-       <option>--min-mxid-age</option>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-04-01 [cc8d41511] Unified logging system for command-line programs
--->
-
-      <para>
-       Add colorization to the output of command-line utilities (Peter
-       Eisentraut)
-      </para>
-
-      <para>
-       This is enabled with by setting environment variable
-       <envar>PG_COLORS</envar>.  EXAMPLE?
-      </para>
-     </listitem>
-
-     </itemizedlist>
-
-    <sect4>
-     <title><xref linkend="app-psql"/></title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-26 [aa2ba50c2] Add CSV table output mode in psql.
--->
-
-       <para>
-        Add <acronym>CSV</acronym> table output mode in
-        <application>psql</application> (Daniel Vérité)
-       </para>
-
-       <para>
-        This is controlled by <command>\pset format csv</command> or the
-        command-line <option>--csv</option> option.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-11 [27f3dea64] psql: Add documentation URL to \help output
--->
-
-       <para>
-        Show the manual page <acronym>URL</acronym> in
-        <application>psql</application>'s <command>\help</command> output
-        (Peter Eisentraut)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2018-11-19 [6e5f8d489] psql: Show IP address in \conninfo
--->
-
-       <para>
-        Display the <acronym>IP</acronym> address in
-        <application>psql</application>'s <command>\conninfo</command>
-        (Fabien Coelho)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-12-23 [11a60d496] Add completion for storage parameters after CREATE TABLE
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-26 [5953c9969] Improve tab completion of CREATE EVENT TRIGGER in psql
-Author: Michael Paquier <michael@paquier.xyz>
-2018-10-26 [292ef6e27] Add tab completion of EXECUTE FUNCTION for CREATE TRIGGE
-Author: Michael Paquier <michael@paquier.xyz>
-2019-01-28 [23349b18d] Add tab completion for ALTER INDEX ALTER COLUMN in psql
-Author: Michael Paquier <michael@paquier.xyz>
-2018-12-20 [4cba9c2a3] Add more tab completion for CREATE TABLE in psql
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-20 [a7c4dad1a] Fix psql's tab completion for ALTER DATABASE ... SET TAB
-Author: Michael Paquier <michael@paquier.xyz>
-2018-12-25 [f89ae34ab] Improve tab completion of ALTER INDEX/TABLE with SET STA
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-20 [c9a8a401f] Fix psql's tab completion for TABLE.
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-21 [121213d9d] Improve tab completion for ANALYZE, EXPLAIN, and VACUUM.
--->
-
-       <para>
-        Improve tab completion of <command>CREATE TABLE, CREATE TRIGGER,
-        CREATE EVENT TRIGGER, ANALYZE, EXPLAIN, VACUUM, ALTER TABLE,
-        ALTER INDEX, ALTER DATABASE, ALTER INDEX ALTER COLUMN</command>
-        (Dagfinn Ilmari Mannsåker, Tatsuro Yamada, Michaël Paquier,
-        Tom Lane, Justin Pryzby)
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-    <sect4>
-     <title><link linkend="pgbench"><application>pgbench</application></link></title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-01-10 [6260cc550] pgbench: add \cset and \gset commands
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-03-25 [25ee70511] pgbench: Remove \cset
--->
-
-       <para>
-        Allow values produced by queries to be assigned to pgbench
-        variables (Fabien Coelho, Álvaro Herrera)
-       </para>
-
-       <para>
-        The commands is <command>\gset</command>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-25 [5b7e03670] Avoid unnecessary precision loss for pgbench's - -rate ta
--->
-
-       <para>
-        Improve precision of pgbench's <option>--rate</option>
-        option (Tom Lane)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-10-15 [5b75a4f82] pgbench: Report errors during run better
--->
-       <para>
-        Improve pgbench error reporting with clearer messages and return
-        codes (Peter Eisentraut)
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-   </sect3>
-
-   <sect3>
-    <title>Server Applications</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-01-08 [354e95d1f] Add - -disable-page-skipping and - -skip-locked to vacuumd
--->
-
-      <para>
-       Allow vacuumdb to disable waiting for locks or skipping all-visible
-       pages (Nathan Bossart)
-      </para>
-
-      <para>
-       The options are <option>--skip-locked</option> and
-       <option>--disable-page-skipping</option>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Alexander Korotkov <akorotkov@postgresql.org>
-2018-09-01 [ec7436993] Implement "pg_ctl logrotate" command
--->
-
-      <para>
-       Allow control of log file rotation via <xref linkend="app-pg-ctl"/>
-       (Kyotaro Horiguchi, Alexander Kuzmenkov, Alexander Korotkov)
-      </para>
-
-      <para>
-       Previously, this was only possible via an <acronym>SQL</acronym>
-       function or a process signal.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
-2019-01-14 [bb24439ce] Detach postmaster process from pg_ctl's session at serve
--->
-
-      <para>
-       Properly detach the server on <application>pg_ctl</application>
-       start (Paul Guo)
-      </para>
-
-      <para>
-       This prevents later shell activity from interfering with the
-       postmaster.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter_e@gmx.net>
-2018-11-07 [3a769d823] pg_upgrade: Allow use of file cloning
--->
-
-      <para>
-       Allow <xref linkend="pgupgrade"/> to use the file system cloning
-       feature (Peter Eisentraut)
-      </para>
-
-      <para>
-       The <option>--clone</option> option has the advantages of
-       <option>--link</option>, while preventing the old cluster from
-       being changed after the new cluster has started.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-12-01 [2d34ad843] Add a - -socketdir option to pg_upgrade.
--->
-
-      <para>
-       Allow specification of the <application>pg_upgrade</application>
-       socket directory (Daniel Gustafsson)
-      </para>
-
-      <para>
-       This is controlled by <option>--socketdir</option>;  the default
-       is the current directory.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-03-23 [e0090c869] Add option -N/- -no-sync to pg_checksums
--->
-
-      <para>
-       Allow <xref linkend="app-pgchecksums"/> to disable fsync operations
-       (Michaël Paquier)
-      </para>
-
-      <para>
-       This is controlled by the <option>--no-sync</option> option.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-07-10 [8a00b96aa] Add pg_rewind - -no-sync
--->
-
-      <para>
-       Allow <xref linkend="app-pgrewind"/> to disable fsync operations
-       (Michaël Paquier)
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-    <sect4>
-     <title><link linkend="app-pgdump"><application>pg_dump</application></link>,
-     <link linkend="app-pg-dumpall"><application>pg_dumpall</application></link>,
-     <link linkend="app-pgrestore"><application>pg_restore</application></link></title>
-
-     <itemizedlist>
-
-      <listitem>
-<!--
-Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
-2019-03-07 [7e413a0f8] pg_dump: allow multiple rows per insert
--->
-
-       <para>
-        Allow control over the number of rows each
-        <application>pg_dump</application> <command>INSERT</command>
-        statement uses (Surafel Temesgen, David Rowley)
-       </para>
-
-       <para>
-        The option is <option>--rows-per-insert</option>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Andrew Dunstan <andrew@dunslane.net>
-2019-03-01 [f092de050] Add - -exclude-database option to pg_dumpall
--->
-
-       <para>
-        Add <option>--exclude-database</option> option to
-        <application>pg_dumpall</application> (Andrew Dunstan)
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2018-07-13 [387a5cfb9] Add pg_dump - -on-conflict-do-nothing option.
--->
-
-       <para>
-        Allow pg_dump to emit <command>INSERT ... ON CONFLICT DO
-        NOTHING</command> (Surafel Temesgen)
-       </para>
-
-       <para>
-        This avoids conflict failures during restore.
-        The <application>pg_dump</application> option is
-        <option>--on-conflict-do-nothing</option>.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-14 [548e50976] Improve parallel scheduling logic in pg_dump/pg_restore.
--->
-
-       <para>
-        Decouple the order of parallel <application>pg_dump</application>
-        from the order used by <application>pg_restore</application>
-        (Tom Lane)
-       </para>
-
-       <para>
-        This allows <application>pg_restore</application> to perform more
-        efficient parallel restores.
-       </para>
-      </listitem>
-
-      <listitem>
-<!--
-Author: Andrew Dunstan <andrew@dunslane.net>
-2019-02-18 [af25bc03e] Provide an extra-float-digits setting for pg_dump / pg_d
--->
-
-       <para>
-        Allow the number of float digits to be specified
-        for <application>pg_dump</application> and
-        <application>pg_dumpall</application> (Andrew Dunstan)
-       </para>
-
-       <para>
-        This allows the float digit output to match previous dumps.
-       </para>
-      </listitem>
-
-     </itemizedlist>
-
-    </sect4>
-
-   </sect3>
-
-   <sect3>
-    <title>Source Code</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-11-16 [4da597edf] Make TupleTableSlots extensible, finish split of
-Author: Andres Freund <andres@anarazel.de>
-2019-03-06 [8586bf7ed] tableam: introduce table AM infrastructure.
-Author: Andres Freund <andres@anarazel.de>
-2019-03-06 [3b925e905] tableam: Add pg_dump support.
-Author: Andres Freund <andres@anarazel.de>
-2019-03-11 [c2fe139c2] tableam: Add and use scan APIs.
-Author: Andres Freund <andres@anarazel.de>
-2019-03-23 [5db6df0c0] tableam: Add tuple_{insert, delete, update, lock} and us
-Author: Andres Freund <andres@anarazel.de>
-2019-03-28 [d25f51910] tableam: relation creation, VACUUM FULL/CLUSTER, SET TAB
-Author: Andres Freund <andres@anarazel.de>
-2019-03-29 [d3a5fc17e] Show table access methods as such in psql's \dA.
-Author: Andres Freund <andres@anarazel.de>
-2019-03-31 [73c954d24] tableam: sample scan.
-Author: Andres Freund <andres@anarazel.de>
-2019-03-31 [bfbcad478] tableam: bitmap table scan.
-existin
--->
-
-      <para>
-       Add <xref linkend="sql-create-access-method"/> command to create
-       new table types (Andres Freund, Haribabu Kommi, Álvaro Herrera,
-       Alexander Korotkov, Dmitry Dolgov)
-      </para>
-
-      <para>
-       This enables the development of new <link linkend="tableam">table
-       access methods</link>, which can optimize storage for different
-       use-cases.  The existing <literal>heap</literal> access method
-       remains the default.
-      </para>
-     </listitem>
-
-      <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
--->
-
-       <para>
-        Add support function capability to improve optimizer estimates,
-        inlining, and indexing for functions (Tom Lane)
-       </para>
-
-       <para>
-        This allows extensions to create planner support functions that
-        can provide function-specific selectivity, cost, and row-count
-        estimates that can depend on the function's arguments.  Support
-        functions can also supply simplified representations and index
-        conditions, greatly expanding optimization possibilities.
-       </para>
-      </listitem>
-
-     <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-12-13 [09568ec3d] Create a separate oid range for oids assigned by genbki.
--->
-
-      <para>
-       Reserve a range of oids (9000-9999) to be used for external
-       extensions (Andres Freund)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Andrew Dunstan <andrew@dunslane.net>
-2018-10-02 [a33245a85] Don't build static libraries on Cygwin
--->
-
-      <para>
-       Build <productname>Cygwin</productname> binaries using dynamic
-       instead of static libraries (Marco Atzeri)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-01-01 [1707a0d2a] Remove configure switch - -disable-strong-random
--->
-
-      <para>
-       Remove <application>configure</application> switch
-       <option>--disable-strong-random</option> (Michaël Paquier)
-      </para>
-
-      <para>
-       A strong random source is now required.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-09-26 [26e9d4d4e] Convert elog.c's useful_strerror() into a globally-used 
--->
-
-      <para>
-       Properly report Winsock errors on
-       <productname>Windows</productname> (Tom Lane)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Andres Freund <andres@anarazel.de>
-2018-08-23 [d9dd406fe] Require C99 (and thus MSCV 2013 upwards).
--->
-
-      <para>
-       Require a C99-supported compiler, and <acronym>MSVC</acronym>
-       2013 or later on <productname>Windows</productname> (Andres Freund)
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Documentation</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-03-27 [ea55aec0a] doc: Add some images
--->
-
-      <para>
-       Add images to the <productname>PostgreSQL</productname>
-       documentation (Jürgen Purtz)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Robert Haas <rhaas@postgresql.org>
-2019-03-29 [c900c1526] Warn more strongly about the dangers of exclusive backup
--->
-
-      <para>
-       More clearly document the problems of server failure during <link
-       linkend="backup-lowlevel-base-backup-exclusive">exclusive base
-       backups</link> (David Steele, Robert Haas)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Greg Stark <stark@mit.edu>
-2018-10-09 [36e9d413a] Add "B" suffix for bytes to docs
--->
-
-      <para>
-       Document that the <literal>B</literal>/bytes units can be specified
-       for <link linkend="config-setting">server variables</link>
-       (Greg Stark)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Joe Conway <mail@joeconway.com>
-2018-09-24 [c62dd80cd] Document aclitem functions and operators
--->
-
-      <para>
-       Add <link linkend="functions-aclitem-op-table">documentation</link>
-       for <type>aclitem</type> functions and operators (Fabien Coelho,
-       John Naylor)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Peter Eisentraut <peter@eisentraut.org>
-2019-04-26 [60bbf0753] doc: Update section on NFS
--->
-
-      <para>
-       Update documentation on the use of <link
-       linkend="creating-cluster-nfs"><acronym>NFS</acronym></link>
-       (Peter Eisentraut)
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-   <sect3>
-    <title>Additional Modules</title>
-
-    <itemizedlist>
-
-     <listitem>
-<!--
-Author: Etsuro Fujita <efujita@postgresql.org>
-2019-04-02 [ffab494a4] postgres_fdw: Perform the (ORDERED, NULL) upperrel opera
-Author: Etsuro Fujita <efujita@postgresql.org>
-2019-04-02 [d50d172e5] postgres_fdw: Perform the (FINAL, NULL) upperrel operati
--->
-
-      <para>
-       Allow more <literal>ORDER BY</literal> sorts and
-       <literal>LIMIT</literal> clauses to be pushed to
-       <application>postgres_fdw</application> foreign tables (Etsuro
-       Fujita)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Etsuro Fujita <efujita@postgresql.org>
-2018-12-04 [f8f6e4467] postgres_fdw: Improve cost and size estimation for aggre
-Author: Etsuro Fujita <efujita@postgresql.org>
-2019-01-24 [fd1afdbaf] postgres_fdw: Account for tlist eval costs in estimate_p
-Author: Etsuro Fujita <efujita@postgresql.org>
-2019-05-09 [edbcbe277] postgres_fdw: Fix cost estimation for aggregate pushdown
--->
-
-      <para>
-       Improve optimizer cost accounting for pushdown of aggregates to
-       <xref linkend="postgres-fdw"/> tables (Etsuro Fujita)
-      </para>
-
-      <para>
-       This release also improves costing of
-       <application>postgres_fdw</application> target list generation.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Jeff Davis <jdavis@postgresql.org>
-2018-07-08 [a45adc747] Fix WITH CHECK OPTION on views referencing postgres_fdw 
--->
-
-      <para>
-       Properly honor <literal>WITH CHECK OPTION</literal> on views
-       that reference <application>postgres_fdw</application> tables
-       (Etsuro Fujita)
-      </para>
-
-      <para>
-       While <literal>CHECK OPTION</literal>s on
-       <application>postgres_fdw</application> tables are ignored (because
-       the reference is foreign), views on such tables are considered
-       local, so this release enforces <literal>CHECK OPTION</literal>s
-       on them.  Previously, only <command>INSERT</command>s and
-       <command>UPDATE</command>s with <literal>RETURNING</literal>
-       clauses that returned <literal>CHECK OPTION</literal> values
-       were validated.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Amit Kapila <akapila@postgresql.org>
-2019-01-11 [43cbedab8] Extend pg_stat_statements_reset to reset statistics spec
--->
-
-      <para>
-       Allow <link
-       linkend="pgstatstatements"><function>pg_stat_statements_reset()</function></link>
-       to be more granular (Haribabu Kommi, Amit Kapila)
-      </para>
-
-      <para>
-       The function now allows reset of statistics for specific databases,
-       users, and queries.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Andrew Dunstan <andrew@dunslane.net>
-2018-07-31 [2d36a5e9d] Provide a log_level setting for auto_explain
--->
-
-      <para>
-       Allow control of the <xref linkend="auto-explain"/> log level
-       (Tom Dunstan, Andrew Dunstan)
-      </para>
-
-      <para>
-       The default is <literal>LOG</literal>.
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2019-01-10 [e1c1d5444] Update unaccent rules with release 34 of CLDR for Latin-
--->
-
-      <para>
-       Update <application>unaccent</application> rules with new
-       punctuation and symbols (Hugh Ranalli, Michaël Paquier)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2019-02-01 [456e3718e] Add combining characters to unaccent.rules.
--->
-
-      <para>
-       Allow <xref linkend="unaccent"/> to handle some accents encoded
-       as combining characters (Hugh Ranalli)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Thomas Munro <tmunro@postgresql.org>
-2018-09-02 [5e8d670c3] Add Greek characters to unaccent.rules.
--->
-
-      <para>
-       Allow <application>unaccent</application> to remove accents from
-       Greek characters (Tasos Maschalidis)
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-23 [48c41fa97] Add a 64-bit hash function for type <type>citext</type>.
--->
-
-      <para>
-       Add 64-bit hash function to <xref linkend="citext"/> (Amul Sul)
-      </para>
-
-      <para>
-       The function <function>citext_hash_extended()</function> also
-       requires a seed value.  NO DOCS?
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Tom Lane <tgl@sss.pgh.pa.us>
-2018-11-23 [eb6f29141] Add a 64-bit hash function for type <application>hstore</application>.
--->
-
-      <para>
-       Add 64-bit hash function to <xref linkend="hstore"/> (Amul Sul)
-      </para>
-
-      <para>
-       The function <function>hstore_hash_extended()</function> also
-       requires a seed value.  NO DOCS?
-      </para>
-     </listitem>
-
-     <listitem>
-<!--
-Author: Michael Paquier <michael@paquier.xyz>
-2018-08-28 [1aaf532de] Rework option set of oid2name
-Author: Michael Paquier <michael@paquier.xyz>
-2018-08-28 [bfea331a5] Rework option set of vacuumlo
--->
-
-      <para>
-       Improve <xref linkend="oid2name"/> and <xref linkend="vacuumlo"/>
-       option handling to match other commands (Tatsuro Yamada)
-      </para>
-     </listitem>
-
-    </itemizedlist>
-
-   </sect3>
-
-  </sect2>
-
-  <sect2 id="release-12-acknowledgements">
-   <title>Acknowledgments</title>
-
-   <para>
-    The following individuals (in alphabetical order) have contributed to this
-    release as patch authors, committers, reviewers, testers, or reporters of
-    issues.
-   </para>
-
-   <simplelist>
-    <member></member>
-   </simplelist>
-  </sect2>
-
- </sect1>
diff --git a/doc/src/sgml/release-13.sgml b/doc/src/sgml/release-13.sgml
new file mode 100644
index 00000000000..d5530f4130d
--- /dev/null
+++ b/doc/src/sgml/release-13.sgml
@@ -0,0 +1,16 @@
+<!-- doc/src/sgml/release-13.sgml -->
+<!-- See header comment in release.sgml about typical markup -->
+
+ <sect1 id="release-13">
+  <title>Release 13</title>
+
+  <formalpara>
+   <title>Release date:</title>
+   <para>2020-??-??</para>
+  </formalpara>
+
+  <para>
+   This is just a placeholder for now.
+  </para>
+
+ </sect1>
diff --git a/doc/src/sgml/release.sgml b/doc/src/sgml/release.sgml
index f2aadd48d43..706dbf4b12a 100644
--- a/doc/src/sgml/release.sgml
+++ b/doc/src/sgml/release.sgml
@@ -79,7 +79,7 @@ For new features, add links to the documentation sections.
   All the active branches have to be edited concurrently when doing that.
 -->
 
-&release-12;
+&release-13;
 
  <sect1 id="release-prior">
   <title>Prior Releases</title>
author	Tom Lane <tgl@sss.pgh.pa.us>	2019-07-01 12:50:55 -0400
committer	Tom Lane <tgl@sss.pgh.pa.us>	2019-07-01 12:50:55 -0400
commit	615cebc94b5ef8fbe353e3c8b838b1e97bcdfd49 (patch)
tree	d598ba14ee3bb6974dc4b6c445c8e85bdb6c242a /doc/src
parent	9e1c9f959422192bbe1b842a2a1ffaf76b080196 (diff)
download	postgresql-615cebc94b5ef8fbe353e3c8b838b1e97bcdfd49.tar.gz postgresql-615cebc94b5ef8fbe353e3c8b838b1e97bcdfd49.zip