path: root/doc/src/sgml/release-17.sgml

<!-- doc/src/sgml/release-16.sgml -->
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 <sect1 id="release-17">
  <title>Release 17</title>

  <formalpara>
   <title>Release date:</title>
   <para>2024-??-??, AS OF 2024-06-17</para>
  </formalpara>

  <sect2 id="release-17-highlights">
   <title>Overview</title>

   <para>
    <productname>PostgreSQL</productname> 17 contains many new features
    and enhancements, including:
   </para>

   <itemizedlist>
    <listitem><para>TO BE COMPLETED LATER</para></listitem>
   </itemizedlist>

   <para>
    The above items and other new features of
    <productname>PostgreSQL</productname> 17 are explained in more detail
    in the sections below.
   </para>

  </sect2>

  <sect2  id="release-17-migration">

   <title>Migration to Version 17</title>

   <para>
    A dump/restore using <xref linkend="app-pg-dumpall"/> or use of
    <xref linkend="pgupgrade"/> or logical replication is required for
    those wishing to migrate data from any previous release.  See <xref
    linkend="upgrading"/> for general information on migrating to new
    major releases.
   </para>

   <para>
    Version 17 contains a number of changes that may affect compatibility
    with previous releases.  Observe the following incompatibilities:
   </para>

   <itemizedlist>

<!--
Author: Jeff Davis <jdavis@postgresql.org>
2024-03-04 [2af07e2f7] Fix search_path to a safe value during maintenance opera
-->

    <listitem>
     <para>
     Change functions to use a safe <xref linkend="guc-search-path"/>
     during maintenance operations (Jeff Davis)
     </para>

     <para>
     This prevents maintenance operations (<command>ANALYZE</command>,
     <command>CLUSTER</command>, <command>REFRESH
     MATERIALIZED VIEW</command>, <command>REINDEX</command>,
     or <command>VACUUM</command>) from performing unsafe access.
     Functions used by expression indexes and materialized views that
     need to reference non-default schemas must specify a search path
     during function creation.
     </para>
    </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-08-28 [165d581f1] Tighten handling of "ago" in interval values
Author: Michael Paquier <michael@paquier.xyz>
2023-08-28 [617f9b7d4] Tighten unit parsing in internal values
-->

    <listitem>
     <para>
     Restrict <literal>ago</literal> to only appear at the end in
     <type>interval</type> values (Joseph Koshakow)
     </para>

     <para>
     Also, prevent empty interval units from appearing multiple times.
     </para>
    </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2023-09-05 [f691f5b80] Remove the "snapshot too old" feature.
-->

    <listitem>
     <para>
     Remove server variable old_snapshot_threshold (Thomas Munro)
     </para>

     <para>
     This variable allowed vacuum to remove rows that potentially could
     be still visible to running transactions, causing "snapshot too
     old" errors later if accessed.  This feature might be re-added
     to <application>PostgreSQL</application> later if an improved
     implementation is found.
     </para>
    </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-07-13 [a0363ab7a] Fix privilege check for SET SESSION AUTHORIZATION.
-->

    <listitem>
     <para>
     Change <link linkend="sql-set-session-authorization"><command>SET
     SESSION AUTHORIZATION</command></link> handling of the initial
     session user's superuser status (Joseph Koshakow)
     </para>

     <para>
     The new behavior is based on the session user's superuser status at
     the time the <command>SET SESSION AUTHORIZATION</command> command
     is issued, rather than their superuser status at connection time.
     </para>
    </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-07-17 [884eee5bf] Remove db_user_namespace.
-->

    <listitem>
     <para>
     Remove feature which simulated per-database users (Nathan Bossart)
     </para>

     <para>
     The feature, <literal>db_user_namespace</literal>, was rarely used.
     </para>
    </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2023-07-14 [d0c28601e] Remove wal_sync_method=fsync_writethrough on Windows.
-->

    <listitem>
     <para>
     Remove <xref linkend="guc-wal-sync-method"/> value
     <literal>fsync_writethrough</literal> on <systemitem
     class="osname">Windows</systemitem> (Thomas Munro)
     </para>

     <para>
     This value was the same as <literal>fsync</literal> on <systemitem
     class="osname">Windows</systemitem>.
     </para>
    </listitem>

<!--
Author: Bruce Momjian <bruce@momjian.us>
2023-11-24 [344afc776] modify segno. for pg_walfile_name() and pg_walfile_name_
-->

    <listitem>
     <para>
     Change file boundary handling of two <acronym>WAL</acronym> file
     name functions (Kyotaro Horiguchi, Andres Freund, Bruce Momjian)
     </para>

     <para>
     The functions <link
     linkend="functions-admin-backup-table"><function>pg_walfile_name()</function></link>
     and <function>pg_walfile_name_offset()</function> used to report
     the previous <acronym>LSN</acronym> segment number when the
     <acronym>LSN</acronym> was on a file segment boundary;  it now
     returns the <acronym>LSN</acronym> segment.
     </para>
    </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-12-11 [c7a3e6b46] Remove trace_recovery_messages
-->

    <listitem>
     <para>
     Remove server variable <literal>trace_recovery_messages</literal>
     since it is no longer needed (Bharath Rupireddy)
     </para>
    </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2023-08-16 [78806a950] Remove incorrect field from information schema
-->

    <listitem>
     <para>
     Remove <link
     linkend="information-schema">information schema</link> column
     <structname>element_types</structname>.<structfield>domain_default</structfield>
     (Peter Eisentraut)
     </para>
    </listitem>

<!--
Author: Bruce Momjian <bruce@momjian.us>
2023-09-26 [15d5d7405] pgrowlocks: change lock mode output labels for consiste
-->

    <listitem>
     <para>
     Change <application><xref linkend="pgrowlocks"/></application>
     lock mode output labels (Bruce Momjian)
     </para>
    </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-27 [74604a37f] Remove buffers_backend and buffers_backend_fsync from pg
-->

    <listitem>
     <para>
     Remove <structfield>buffers_backend</structfield> and
     <structfield>buffers_backend_fsync</structfield> from <link
     linkend="monitoring-pg-stat-bgwriter-view"><structname>pg_stat_bgwriter</structname></link>
     (Bharath Rupireddy)
     </para>

     <para>
     These fields are considered redundant to similar columns in <link
     linkend="monitoring-pg-stat-io-view"><structname>pg_stat_io</structname></link>.
     </para>
    </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-19 [13d00729d] Rename I/O timing statistics columns to shared_blk_{read
-->

    <listitem>
     <para>
     Rename I/O block read/write timing statistics columns of
     <application><xref linkend="pgstatstatements"/></application>
     (Nazir Bilal Yavuz)
     </para>

     <para>
     This renames <structfield>blk_read_time</structfield>
     to <structfield>shared_blk_read_time</structfield>,
     and <structfield>blk_write_time</structfield> to
     <structfield>shared_blk_write_time</structfield>.
     </para>
    </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-01-13 [4f622503d] Make attstattarget nullable
Author: Peter Eisentraut <peter@eisentraut.org>
2024-03-17 [012460ee9] Make stxstattarget nullable
-->

    <listitem>
     <para>
     Change <link
     linkend="catalog-pg-attribute"><structname>pg_attribute</structname>.<structfield>attstattarget</structfield></link>
     and
     <structname>pg_attribute</structname>.<structfield>stxstattarget</structfield>
     to represent the default statistics target as <literal>NULL</literal>
     (Peter Eisentraut)
     </para>
    </listitem>

<!--
Author: Masahiko Sawada <msawada@postgresql.org>
2024-04-02 [667e65aac] Use TidStore for dead tuple TIDs storage during lazy vac
Author: Masahiko Sawada <msawada@postgresql.org>
2024-06-14 [f1affb670] Reintroduce dead tuple counter in pg_stat_progress_vacuu
-->

    <listitem>
     <para>
     Change <link
     linkend="vacuum-progress-reporting"><structname>pg_stat_progress_vacuum</structname></link>
     columns <structfield>max_dead_tuples</structfield>
     to <structfield>max_dead_tuple_bytes</structfield>,
     rename <structfield>num_dead_tuples</structfield> to
     <structfield>num_dead_item_ids</structfield>, and add
     <structfield>dead_tuple_bytes</structfield> (Masahiko Sawada)
     </para>
    </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2024-02-28 [bcdfa5f2e] Rename SLRU elements in view pg_stat_slru
-->

    <listitem>
     <para>
     Rename <acronym>SLRU</acronym> columns in system view <link
     linkend="monitoring-pg-stat-slru-view"><structname>pg_stat_slru</structname></link>
     (Alvaro Herrera)
     </para>

     <para>
     The column names accepted by <link
     linkend="monitoring-stats-funcs-table"><function>pg_stat_reset_slru()</function></link>
     are also changed.
     </para>
    </listitem>

   </itemizedlist>

  </sect2>

  <sect2 id="release-17-changes">
   <title>Changes</title>

    <para>
     Below you will find a detailed account of the changes between
    <productname>PostgreSQL</productname> 17 and the previous major
    release.
    </para>

   <sect3 id="release-17-server">
    <title>Server</title>

    <sect4 id="release-17-optimizer">
     <title>Optimizer</title>

     <itemizedlist>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-11-17 [f7816aec2] Extract column statistics from CTE references, if possib
-->

      <listitem>
       <para>
       Allow the optimizer to improve <acronym>CTE</acronym> plans by
       considering the statistics of columns referenced in earlier row
       output clauses (Jian Guo, Tom Lane)
       </para>
      </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-03-26 [a65724dfa] Propagate pathkeys from CTEs up to the outer query.
-->

      <listitem>
       <para>
       Allow the optimizer to improve <acronym>CTE</acronym> plans by
       considering the sort order of columns referenced in earlier row
       output clauses (Richard Guo)
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2024-01-23 [b262ad440] Add better handling of redundant IS [NOT] NULL quals
Author: David Rowley <drowley@postgresql.org>
2024-04-12 [3af704098] Fix IS [NOT] NULL qual optimization for inheritance tabl
-->

      <listitem>
       <para>
       Improve optimization of <literal>IS NOT NULL</literal> and
       <literal>IS NULL</literal> query restrictions (David Rowley,
       Richard Guo, Andy Fan)
       </para>

       <para>
       Remove <literal>IS NOT NULL</literal> query restrictions on
       <literal>NOT NULL</literal> columns and eliminate scans on
       <literal>NOT NULL</literal> columns if <literal>IS NULL</literal>
       is specified.
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2024-03-04 [07c36c133] Support partition pruning on boolcol IS [NOT] UNKNOWN
-->

      <listitem>
       <para>
       Allow partition pruning on boolean columns on <literal>IS [NOT]
       UNKNOWN</literal> conditionals (David Rowley)
       </para>
      </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-01-20 [075df6b20] Add planner support functions for range operators &lt;@ and
-->

      <listitem>
       <para>
       Improve optimization of range values when using containment
       operators &lt;@ and @&gt; (Kim Johan Andersson, Jian He)
       </para>
      </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-02-15 [9f1337639] Pull up ANY-SUBLINK with the necessary lateral support.
-->

      <listitem>
       <para>
       Allow correlated <literal>IN</literal> subqueries to be transformed
       into joins (Andy Fan, Tom Lane)
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2023-10-05 [a8a968a82] Consider cheap startup paths in add_paths_to_append_rel
-->

      <listitem>
       <para>
       Improve optimization of the <literal>LIMIT</literal> clause
       on partitioned tables, inheritance parents, and <literal>UNION
       ALL</literal> queries (Andy Fan, David Rowley)
       </para>
      </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-07-14 [e08d74ca1] Allow plan nodes with initPlans to be considered paralle
-->

      <listitem>
       <para>
       Allow query nodes to be run in parallel in more cases (Tom Lane)
       </para>
      </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-01-21 [0452b461b] Explore alternative orderings of group-by pathkeys durin
-->

      <listitem>
       <para>
       Allow <literal>GROUP BY</literal> columns to be internally
       ordered to match <literal>ORDER BY</literal> (Andrei Lepikhov,
       Teodor Sigaev)
       </para>

       <para>
       This can be disabled using server variable
       enable_group_by_reordering.  MISSING DOCS
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2024-03-25 [66c0185a3] Allow planner to use Merge Append to efficiently impleme
-->

      <listitem>
       <para>
       Allow <literal>UNION</literal> (without <literal>ALL</literal>)
       to use MergeAppend (David Rowley)
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2024-02-01 [9d1a5354f] Fix costing bug in MergeAppend
-->

      <listitem>
       <para>
       Fix MergeAppend plans to more accurately compute the number of
       rows that need to be sorted (Alexander Kuzmenkov)
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2023-07-04 [625d5b3ca] Allow Incremental Sorts on GiST and SP-GiST indexes
-->

      <listitem>
       <para>
       Allow  <link linkend="gist">GiST</link> and <link
       linkend="spgist">SP-GiST</link> indexes to be part of incremental
       sorts (Miroslav Bendik)
       </para>

       <para>
       This is particularly useful for <literal>ORDER BY</literal>
       clauses where the first column has a GiST and SP-GiST index,
       and other columns do not.
       </para>
      </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-11-27 [bc3c8db8a] Display length and bounds histograms in pg_stats
-->

      <listitem>
       <para>
       Add columns to <link
       linkend="view-pg-stats"><structname>pg_stats</structname></link>
       to report range-type histogram information (Egor Rogov, Soumyadeep
       Chakraborty)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-indexes">
     <title>Indexes</title>

     <itemizedlist>
<!--
Author: Peter Geoghegan <pg@bowt.ie>
2024-04-06 [5bf748b86] Enhance nbtree ScalarArrayOp execution.
-->

      <listitem>
       <para>
       Allow <link linkend="btree">btree</link> indexes to more
       efficiently find a set of values, such as those supplied by
       <literal>IN</literal> clauses using constants (Peter Geoghegan,
       Matthias van de Meent)
       </para>
      </listitem>

<!--
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2023-12-08 [b43757171] Allow parallel CREATE INDEX for BRIN indexes
-->

      <listitem>
       <para>
       Allow <link linkend="brin"><acronym>BRIN</acronym></link> indexes
       to be created using parallel workers (Tomas Vondra, Matthias van
       de Meent)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-performance">
     <title>General Performance</title>

     <itemizedlist>

<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-03 [6dbb49026] Combine freezing and pruning steps in VACUUM
-->

      <listitem>
       <para>
       Allow vacuum to more efficiently remove and freeze tuples (Melanie
       Plageman, Heikki Linnakangas)
       </para>

       <para>
       <acronym>WAL</acronym> traffic caused by vacuum is also more
       compact.
       </para>
      </listitem>

<!--
Author: John Naylor <john.naylor@postgresql.org>
2024-03-07 [ee1b30f12] Add template for adaptive radix tree
Author: Masahiko Sawada <msawada@postgresql.org>
2024-03-21 [30e144287] Add TIDStore, to store sets of TIDs (ItemPointerData) ef
Author: Masahiko Sawada <msawada@postgresql.org>
2024-04-02 [667e65aac] Use TidStore for dead tuple TIDs storage during lazy vac
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-03 [6dbb49026] Combine freezing and pruning steps in VACUUM
-->

      <listitem>
       <para>
       Allow vacuum to more efficiently store tuple references (Masahiko
       Sawada, John Naylor)
       </para>

       <para>
       Additionally, vacuum is no longer silently limited to one gigabyte
       of memory when <xref linkend="guc-maintenance-work-mem"/> or <xref
       linkend="guc-autovacuum-work-mem"/> are higher.
       </para>
      </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2024-01-18 [c120550ed] Optimize vacuuming of relations with no indexes.
-->

      <listitem>
       <para>
       Optimize vacuuming of relations with no indexes (Melanie Plageman)
       </para>
      </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2024-04-06 [98f320eb2] Increase default vacuum_buffer_usage_limit to 2MB.
-->

      <listitem>
       <para>
       Increase default <xref linkend="guc-vacuum-buffer-usage-limit"/>
       to 2MB (Thomas Munro)
       </para>
      </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-26 [d365ae705] Optimize roles_is_member_of() with a Bloom filter.
-->

      <listitem>
       <para>
       Improve performance when checking roles with many memberships
       (Nathan Bossart)
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-25 [71e4cc6b8] Optimize WAL insertion lock acquisition and release with
-->

      <listitem>
       <para>
       Improve performance of heavily-contended <acronym>WAL</acronym>
       writes (Bharath Rupireddy)
       </para>
      </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2024-04-07 [c4ab7da60] Avoid needless large memcpys in libpq socket writing
-->

      <listitem>
       <para>
       Improve performance when transferring large blocks of data to a
       client (Melih Mutlu)
       </para>
      </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2024-04-03 [210622c60] Provide vectored variant of ReadBuffer().
Author: Thomas Munro <tmunro@postgresql.org>
2024-04-08 [b7b0f3f27] Use streaming I/O in sequential scans.
Author: Thomas Munro <tmunro@postgresql.org>
2024-04-08 [041b96802] Use streaming I/O in ANALYZE.
-->

      <listitem>
       <para>
       Allow the grouping of file system reads with the new system variable
       <xref linkend="guc-io-combine-limit"/> (Thomas Munro, Andres Freund,
       Melanie Plageman, Nazir Bilal Yavuz)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-monitoring">
     <title>Monitoring</title>

     <itemizedlist>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-30 [96f052613] Introduce pg_stat_checkpointer
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-12-25 [12915a58e] Enhance checkpointer restartpoint statistics
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-03-14 [e820db5b5] Improve documentation for pg_stat_checkpointer fields
-->

      <listitem>
       <para>
       Create system view <link
       linkend="monitoring-pg-stat-checkpointer-view"><structname>pg_stat_checkpointer</structname></link>
       (Bharath Rupireddy, Anton A. Melnikov, Alexander Korotkov)
       </para>

       <para>
       Relevant columns have been removed from <link
       linkend="pg-stat-bgwriter-view"><structname>pg_stat_bgwriter</structname></link>
       and added to this new system view.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-11-12 [23c8c0c8f] Add ability to reset all shared stats types in pg_stat_r
Author: Michael Paquier <michael@paquier.xyz>
2023-11-16 [2e8a0edc2] Add target "slru" to pg_stat_reset_shared()
Author: Michael Paquier <michael@paquier.xyz>
2023-11-14 [e5cca6288] Add support for pg_stat_reset_slru without argument
-->

      <listitem>
       <para>
       Improve control over resetting statistics (Atsushi Torikoshi,
       Bharath Rupireddy)
       </para>

       <para>
       Allow <link
       linkend="monitoring-stats-funcs-table"><function>pg_stat_reset_shared()</function></link>
       (with no arguments) and
       pg_stat_reset_shared(<literal>NULL</literal>) to reset all
       shared statistics.  Allow pg_stat_reset_shared('slru') and <link
       linkend="monitoring-stats-funcs-table"><function>pg_stat_reset_slru()</function></link>
       (with no arguments) to reset <acronym>SLRU</acronym> statistics,
       which was already possible with pg_stat_reset_slru(NULL).
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2024-01-25 [1d35f705e] Add more LOG messages when starting and ending recovery
-->

      <listitem>
       <para>
       Add log messages related to <acronym>WAL</acronym> recovery from
       backup (Andres Freund)
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-08-26 [e48b19c5d] Generate new LOG for "trust" connections under log_conne
-->

      <listitem>
       <para>
       Add <xref linkend="guc-log-connections"/> log line for
       <literal>trust</literal> connections (Jacob Champion)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2023-11-21 [7c3fb505b] Log messages for replication slot acquisition and releas
-->

      <listitem>
       <para>
       Add log message to report walsender acquisition and release of
       replication slots (Bharath Rupireddy)
       </para>

       <para>
       This is enabled by the server variable <xref
       linkend="guc-log-replication-commands"/>.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-08-20 [1e68e43d3] Add system view pg_wait_events
-->

      <listitem>
       <para>
       Add system view <link
       linkend="view-pg-wait-events"><structname>pg_wait_events</structname></link>
       that reports wait event types (Bertrand Drouvot)
       </para>

       <para>
       This is useful for adding descriptions
       to wait events reported in <link
       linkend="monitoring-pg-stat-activity-view"><structname>pg_stat_activity</structname></link>.
       </para>
      </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2023-10-13 [0013ba290] Add wait events for checkpoint delay mechanism.
-->

      <listitem>
       <para>
       Add <link linkend="view-pg-wait-events">wait events</link> for
       checkpoint delays (Thomas Munro)
       </para>
      </listitem>

<!--
Author: Masahiko Sawada <msawada@postgresql.org>
2023-07-11 [46ebdfe16] Report index vacuum progress.
-->

      <listitem>
       <para>
       Allow vacuum to report the progress of index processing (Sami
       Imseih)
       </para>

       <para>
       This appears in system view <link
       linkend="pg-stat-progress-vacuum-view"><structname>pg_stat_progress_vacuum</structname></link>
       columns <structfield>indexes_total</structfield> and
       <structfield>indexes_processed</structfield>.
       </para>
      </listitem>

<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-08 [705843d29] Enhance libpq encryption negotiation tests with new GUC
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-08 [3dbd2ff78] Adjust wording of trace_connection_negotiation GUC's des
-->

      <listitem>
       <para>
       Add undocumented server variable
       <literal>trace_connection_negotiation</literal> to allow debugging
       of connection encryption (Heikki Linnakangas, Kyotaro Horiguchi)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-privileges">
     <title>Privileges</title>

     <itemizedlist>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-13 [ecb0fd337] Reintroduce MAINTAIN privilege and pg_maintain predefine
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-13 [ecb0fd337] Reintroduce MAINTAIN privilege and pg_maintain predefine
-->

      <listitem>
       <para>
       Allow granting the right to perform maintenance operations
       (Nathan Bossart)
       </para>

       <para>
       The permission can be granted on a per-table basis using the <link
       linkend="ddl-priv-maintain"><literal>MAINTAIN</literal></link>
       privilege and on a per-role basis via the <link
       linkend="predefined-roles"><literal>pg_maintain</literal></link>
       predefined role.  Permitted operations are
       <command>VACUUM</command>, <command>ANALYZE</command>,
       <command>REINDEX</command>, <command>REFRESH MATERIALIZED
       VIEW</command>, <command>CLUSTER</command>, and <command>LOCK
       TABLE</command>.
       </para>
      </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-02-14 [8d8afd48d] Allow pg_monitor to execute pg_current_logfile().
-->

      <listitem>
       <para>
       Allow roles with <link
       linkend="predefined-roles"><literal>pg_monitor</literal></link>
       membership to execute <link
       linkend="functions-info-session-table"><function>pg_current_logfile()</function></link>
       (Pavlo Golub, Nathan Bossart)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-server-config">
     <title>Server Configuration</title>

     <itemizedlist>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2024-03-29 [d3ae2a24f] Add allow_alter_system GUC.
-->

      <listitem>
       <para>
       Add system variable <xref linkend="guc-allow-alter-system"/>
       to disallow <link linkend="sql-altersystem"><command>ALTER
       SYSTEM</command></link> (Jelte Fennema-Nio, Gabriele Bartolini)
       </para>
      </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-10-21 [2d870b4ae] Allow ALTER SYSTEM to set unrecognized custom GUCs.
-->

      <listitem>
       <para>
       Allow <link linkend="sql-altersystem"><command>ALTER
       SYSTEM</command></link> to set unrecognized custom server variables
       (Tom Lane)
       </para>

       <para>
       This is also possible with <link linkend="sql-grant"><literal>GRANT
       ON PARAMETER</literal></link>.
       </para>
      </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-02-15 [51efe38cb] Introduce transaction_timeout
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-02-16 [bf82f4379] Followup fixes for transaction_timeout
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-02-25 [28e858c0f] Improve documentation and GUC description for transactio
-->

      <listitem>
       <para>
       Add server variable <xref linkend="guc-transaction-timeout"/> to
       restrict the duration of transactions (Andrey Borodin, Japin Li,
       Junwang Zhao, Alexander Korotkov)
       </para>
      </listitem>

<!--
Author: Jeff Davis <jdavis@postgresql.org>
2024-03-13 [2d819a08a] Introduce "builtin" collation provider.
Author: Jeff Davis <jdavis@postgresql.org>
2024-03-18 [846311051] Address more review comments on commit 2d819a08a1.
Author: Jeff Davis <jdavis@postgresql.org>
2024-03-19 [f69319f2f] Support C.UTF-8 locale in the new builtin collation prov
Author: Jeff Davis <jdavis@postgresql.org>
2024-03-20 [9acae56ce] Inline basic UTF-8 functions.
-->

      <listitem>
       <para>
       Add a builtin platform-independent collation provider (Jeff Davis)
       </para>

       <para>
       This supports <literal>C</literal> and <literal>C.UTF-8</literal>
       collations.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-06 [a14354cac] Add GUC parameter "huge_pages_status"
-->

      <listitem>
       <para>
       Add server variable <xref linkend="guc-huge-page-size"/> to report
       the use of huge pages by Postgres (Justin Pryzby)
       </para>

       <para>
       This is useful when <xref linkend="guc-huge-pages"/> is set to
       <literal>try</literal>.
       </para>
      </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-09-25 [7750fefdb] Add GUC for temporarily disabling event triggers
-->

      <listitem>
       <para>
       Add server variable to disable event triggers (Daniel Gustafsson)
       </para>

       <para>
       The setting, <xref linkend="guc-event-triggers"/>, allows for the
       temporary disabling of event triggers for debugging.
       </para>
      </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2024-02-28 [53c2a97a9] Improve performance of subsystems on top of SLRU
-->

      <listitem>
       <para>
       Allow the <link
       linkend="monitoring-pg-stat-slru-view"><acronym>SLRU</acronym></link>
       cache sizes to be configured (Andrey Borodin, Dilip Kumar,
       Alvaro Herrera)
       </para>

       <para>
       The new server variables are <xref
       linkend="guc-commit-timestamp-buffers"/>,
       <xref linkend="guc-multixact-member-buffers"/>,
       <xref linkend="guc-multixact-offset-buffers"/>,
       <xref linkend="guc-notify-buffers"/>, <xref
       linkend="guc-serializable-buffers"/>, <xref
       linkend="guc-subtransaction-buffers"/>, and <xref
       linkend="guc-transaction-buffers"/>. commit_timestamp_buffers,
       transaction_buffers and subtransaction_buffers scale up
       automatically with <xref linkend="guc-shared-buffers"/>.
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-replication">
     <title>Streaming Replication and Recovery</title>

     <itemizedlist>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2023-12-20 [dc2123400] Add support for incremental backup.
Author: Tomas Vondra <tomas.vondra@postgresql.org>
2024-04-05 [f8ce4ed78] Allow copying files using clone/copy_file_range
-->

      <listitem>
       <para>
       Add support for incremental file system backup (Robert Haas,
       Jakub Wartak, Tomas Vondra)
       </para>

       <para>
       Incremental backups can be created using <link
       linkend="app-pgbasebackup"><application>pg_basebackup</application></link>'s
       new <option>--incremental</option>
       option.  The new application <link
       linkend="app-pgcombinebackup"><application>pg_combinebackup</application></link>
       allows manipulation of base and incremental file system backups.
       </para>
      </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2023-12-20 [174c48050] Add a new WAL summarizer process.
Author: Nathan Bossart <nathan@postgresql.org>
2024-01-09 [d97ef756a] Fix documentation for wal_summary_keep_time.
Author: Robert Haas <rhaas@postgresql.org>
2024-01-09 [f896057e4] Document WAL summarization information functions.
Author: Robert Haas <rhaas@postgresql.org>
2024-01-11 [d9ef650fc] Add new function pg_get_wal_summarizer_state().
-->

      <listitem>
       <para>
       Allow the creation of <acronym>WAL</acronym> summarization files
       (Robert Haas, Nathan Bossart, Hubert Depesz Lubaczewski)
       </para>

       <para>
       These files record the block numbers that have changed within an
       <link linkend="datatype-pg-lsn"><acronym>LSN</acronym></link>
       range and are useful for incremental file
       system backups.  This is controlled by the server
       variables <xref linkend="guc-summarize-wal"/> and <xref
       linkend="guc-wal-summary-keep-time"/>, and introspected with <link
       linkend="functions-wal-summary"><function>pg_available_wal_summaries()</function></link>,
       <function>pg_wal_summary_contents()</function>, and
       <function>pg_get_wal_summarizer_state()</function>.
       </para>
      </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2024-03-13 [2041bc427] Add the system identifier to backup manifests.
-->

      <listitem>
       <para>
       Add the system identifier to file system <link
       linkend="backup-manifest-format">backup manifest</link> files
       (Amul Sul)
       </para>

       <para>
       This helps detect invalid <acronym>WAL</acronym> usage.
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-03-21 [a145f424d] Allow dbname to be written as part of connstring via pg_
-->

      <listitem>
       <para>
       Allow connection string value
       <literal>dbname</literal> to be written when <link
       linkend="app-pgbasebackup"><application>pg_basebackup</application></link>
       writes connection information to
       <filename>postgresql.auto.conf</filename> (Vignesh C, Hayato Kuroda)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-01-04 [007693f2a] Track conflict_reason in pg_replication_slots.
Author: Amit Kapila <akapila@postgresql.org>
2024-03-22 [6ae701b43] Track invalidation_reason in pg_replication_slots.
-->

      <listitem>
       <para>
       Add column <link
       linkend="view-pg-replication-slots"><structname>pg_replication_slots</structname>.<structfield>invalidation_reason</structfield></link>
       to report the reason for invalid slots (Shveta Malik, Bharath
       Rupireddy)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-03-25 [a11f330b5] Track last_inactive_time in pg_replication_slots.
Author: Amit Kapila <akapila@postgresql.org>
2024-03-27 [6d49c8d4b] Change last_inactive_time to inactive_since in pg_replic
Author: Amit Kapila <akapila@postgresql.org>
2024-04-05 [6f132ed69] Allow synced slots to have their inactive_since.
-->

      <listitem>
       <para>
       Add column <link
       linkend="view-pg-replication-slots"><structname>pg_replication_slots</structname>.<structfield>inactive_since</structfield></link>
       to report slot inactivity duration (Bharath Rupireddy)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-02-14 [ddd5f4f54] Add a slot synchronization function.
Author: Amit Kapila <akapila@postgresql.org>
2024-02-16 [7a424ece4] Add more LOG and DEBUG messages for slot synchronization
-->

      <listitem>
       <para>
       Add function <link
       linkend="functions-replication-table"><function>pg_sync_replication_slots()</function></link>
       to synchronize logical replication slots (Hou Zhijie, Shveta Malik,
       Ajin Cherian, Peter Eisentraut)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-01-29 [732924043] Allow setting failover property in the replication comma
-->

      <listitem>
       <para>
       Add the <literal>failover</literal> property to the <link
       linkend="protocol-replication">replication protocol</link> (Hou
       Zhijie, Shveta Malik)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

    <sect4 id="release-17-logical">
     <title><link linkend="logical-replication">Logical Replication</link></title>

     <itemizedlist>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-03-25 [d44032d01] pg_createsubscriber: creates a new logical replica from
-->

      <listitem>
       <para>
       Add application <link
       linkend="app-pgcreatesubscriber"><application>pg_createsubscriber</application></link>
       to create a logical replica from a physical standby server
       (Euler Taveira)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2023-10-26 [29d0a77fa] Migrate logical slots to the new node during an upgrade.
Author: Amit Kapila <akapila@postgresql.org>
2024-01-02 [9a17be1e2] Allow upgrades to preserve the full subscription's state
-->

      <listitem>
       <para>
       Have <link
       linkend="pgupgrade"><application>pg_upgrade</application></link>
       migrate valid logical slots and subscriptions (Hayato Kuroda,
       Hou Zhijie, Vignesh C, Julien Rouhaud, Shlok Kyal)
       </para>

       <para>
       This allows logical replication to continue quickly
       after the upgrade.  This only works for old clusters of
       <productname>PostgreSQL</productname> version 17 or later.
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-01-25 [c393308b6] Allow to enable failover property for replication slots
-->

      <listitem>
       <para>
       Enable the failover of <link
       linkend="logical-replication-subscription-slot">logical slots</link>
       (Hou Zhijie, Shveta Malik, Ajin Cherian)
       </para>

       <para>
       This is controlled by an optional fifth argument to <link
       linkend="functions-replication-table"><function>pg_create_logical_replication_slot()</function></link>.
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-02-22 [93db6cbda] Add a new slot sync worker to synchronize logical slots
Author: Amit Kapila <akapila@postgresql.org>
2024-03-06 [60c07820d] Doc: Improve replication slot synchronization section.
-->

      <listitem>
       <para>
       Add server variable <xref linkend="guc-sync-replication-slots"/>
       to enable failover logical slot synchronization (Shveta Malik,
       Hou Zhijie, Peter Smith)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-01-30 [776621a5e] Add a failover option to subscriptions.
Author: Amit Kapila <akapila@postgresql.org>
2024-02-07 [22f7e61a6] Clean-ups for 776621a5e4 and 7329240437.
-->

      <listitem>
       <para>
       Add logical replication failover control to <link
       linkend="sql-createsubscription"><literal>CREATE/ALTER
       SUBSCRIPTION</literal></link> (Shveta Malik, Hou Zhijie, Ajin
       Cherian)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2023-07-14 [edca34243] Allow the use of a hash index on the subscriber during r
-->

      <listitem>
       <para>
       Allow the application of logical replication changes to use
       <link linkend="hash-index">hash</link> indexes on the subscriber
       (Hayato Kuroda)
       </para>

       <para>
       Previously only <link linkend="btree">btree</link> indexes could
       be used for this purpose.
       </para>
      </listitem>

<!--
Author: Masahiko Sawada <msawada@postgresql.org>
2024-04-03 [5bec1d6bc] Improve eviction algorithm in ReorderBuffer using max-he
-->

      <listitem>
       <para>
       Improve <link linkend="logicaldecoding">logical decoding</link>
       performance in cases where there are many subtransactions
       (Masahiko Sawada)
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2023-10-17 [79243de13] Restart the apply worker if the privileges have been rev
-->

      <listitem>
       <para>
       Restart apply workers if subscription owner's superuser privileges
       are revoked (Vignesh C)
       </para>

       <para>
       This forces reauthentication.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-18 [173b56f1e] Add flush option to pg_logical_emit_message()
-->

      <listitem>
       <para>
       Add <literal>flush</literal> option to <link
       linkend="functions-replication-table"><function>pg_logical_emit_message()</function></link>
       (Michael Paquier)
       </para>

       <para>
       This makes the message durable.
       </para>
      </listitem>

<!--
Author: Amit Kapila <akapila@postgresql.org>
2024-03-08 [bf279ddd1] Introduce a new GUC 'standby_slot_names'.
-->

      <listitem>
       <para>
       Allow specification of physical standbys that must be synchronized
       before they are visible to subscribers (Hou Zhijie, Shveta Malik)
       </para>

       <para>
       The server variable is <xref linkend="guc-standby-slot-names"/>.
       </para>
      </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-09-25 [13aeaf079] Add worker type to pg_stat_subscription.
-->

      <listitem>
       <para>
       Add worker type column to <link
       linkend="monitoring-pg-stat-subscription"><structname>pg_stat_subscription</structname></link>
       (Peter Smith)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

   <sect3 id="release-17-utility">
    <title>Utility Commands</title>

    <itemizedlist>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-01-16 [9e2d87011] Add new COPY option SAVE_ERROR_TO
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-01-19 [b725b7eec] Rename COPY option from SAVE_ERROR_TO to ON_ERROR
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-02-03 [40bbc8cf0] Improve documentation for COPY ... ON_ERROR ...
Author: Masahiko Sawada <msawada@postgresql.org>
2024-04-17 [a6d0fa5ef] Disallow specifying ON_ERROR option without value.
-->

     <listitem>
      <para>
      Add new <link linkend="sql-copy"><command>COPY</command></link>
      option <literal>ON_ERROR ignore</literal> to discard error rows
      (Damir Belyalov, Atsushi Torikoshi, Alex Shulgin, Jian He, Yugo
      Nagata)
      </para>

      <para>
      The default behavior is <literal>ON_ERROR stop</literal>.
      </para>
     </listitem>

<!--
Author: Masahiko Sawada <msawada@postgresql.org>
2024-04-01 [f5a227895] Add new COPY option LOG_VERBOSITY.
-->

     <listitem>
      <para>
      Add new <command>COPY</command> option
      <literal>LOG_VERBOSITY</literal> which reports <literal>COPY
      FROM</literal> ignored error rows (Bharath Rupireddy)
      </para>
     </listitem>

<!--
Author: Masahiko Sawada <msawada@postgresql.org>
2024-01-25 [729439607] Add progress reporting of skipped tuples during COPY FRO
-->

     <listitem>
      <para>
      Allow <literal>COPY FROM</literal> to report the number of skipped
      rows during processing (Atsushi Torikoshi)
      </para>

      <para>
      This appears in system view column <link
      linkend="copy-progress-reporting"><structname>pg_stat_progress_copy</structname>.<structfield>tuples_skipped</structfield></link>.
      </para>
     </listitem>

<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2023-09-30 [f6d4c9cf1] Provide FORCE_NULL * and FORCE_NOT_NULL * options for CO
-->

     <listitem>
      <para>
      In <literal>COPY FROM</literal>, allow easy specification that all
      columns should be forced null or not null (Zhang Mingli)
      </para>
     </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2024-01-29 [5de890e36] Add EXPLAIN (MEMORY) to report planner memory consumptio
-->

     <listitem>
      <para>
      Allow <link linkend="sql-explain"><command>EXPLAIN</command></link>
      to report optimizer memory usage (Ashutosh Bapat)
      </para>

      <para>
      The option is called <literal>MEMORY</literal>.
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-04-03 [06286709e] Invent SERIALIZE option for EXPLAIN.
-->

     <listitem>
      <para>
      Add <command>EXPLAIN</command> option <literal>SERIALIZE</literal>
      to report the cost of converting data for network transmission
      (Stepan Rutz, Matthias van de Meent)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-19 [295c36c0c] Add local_blk_{read|write}_time I/O timing statistics fo
-->

     <listitem>
      <para>
      Add local I/O block read/write timing statistics to
      <command>EXPLAIN</command> (Nazir Bilal Yavuz)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-03-19 [fd0398fcb] Improve EXPLAIN's display of SubPlan nodes and output pa
-->

     <listitem>
      <para>
      Improve <command>EXPLAIN</command>'s display of SubPlan nodes and
      output parameters (Tom Lane, Dean Rasheed)
      </para>
     </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-09-08 [5a3423ad8] Add JIT deform_counter
-->

     <listitem>
      <para>
      Add <acronym>JIT</acronym> <literal>deform_counter</literal>
      details to <command>EXPLAIN</command> (Dmitry Dolgov)
      </para>
     </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-04-07 [1adf16b8f] Implement ALTER TABLE ... MERGE PARTITIONS ... command
-->

     <listitem>
      <para>
      Allow partitions to be merged using <link
      linkend="sql-altertable"><literal>ALTER TABLE ... MERGE
      PARTITIONS</literal></link> (Dmitry Koval)
      </para>
     </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-04-07 [87c21bb94] Implement ALTER TABLE ... SPLIT PARTITION ... command
-->

     <listitem>
      <para>
      Allow partitions to be split using <literal>ALTER TABLE ... SPLIT
      PARTITION</literal> (Dmitry Koval)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-01-16 [699586315] Support identity columns in partitioned tables
-->

     <listitem>
      <para>
      Allow partitioned tables to have identity columns (Ashutosh Bapat)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2023-07-12 [8c852ba9a] Allow some exclusion constraints on partitions
-->

     <listitem>
      <para>
      Allow <link linkend="ddl-constraints-exclusion">exclusion
      constraints</link> on partitioned tables (Paul A. Jungwirth)
      </para>

      <para>
      As long as exclusion constraints compare partition key columns
      for equality, other columns can use exclusion constraint-specific
      comparisons.
      </para>
     </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2024-03-25 [374c7a229] Allow specifying an access method for partitioned tables
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2024-03-28 [e2395cdbe] ALTER TABLE: rework determination of access method ID
-->

     <listitem>
      <para>
      Allow specification of partitioned <link linkend="tableam">table
      access methods</link> (Justin Pryzby, Soumyadeep Chakraborty,
      Michael Paquier)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-01-13 [4f622503d] Make attstattarget nullable
-->

     <listitem>
      <para>
      Add clearer <link linkend="sql-altertable"><command>ALTER
      TABLE</command></link> method to set a column to the default
      statistics target (Peter Eisentraut)
      </para>

      <para>
      The new syntax is <literal>ALTER TABLE ... SET STATISTICS
      DEFAULT</literal>; using <literal>SET STATISTICS -1</literal>
      is still supported.
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-01-04 [5d06e99a3] ALTER TABLE command to change generation expression
-->

     <listitem>
      <para>
      Allow <literal>ALTER TABLE</literal> to change a column's generation
      expression (Amul Sul)
      </para>

      <para>
      The syntax is <literal>ALTER TABLE ... ALTER COLUMN ... SET
      EXPRESSION</literal>.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2024-03-08 [d61a6cad6] Add support for DEFAULT in ALTER TABLE .. SET ACCESS MET
-->

     <listitem>
      <para>
      Add <literal>DEFAULT</literal> setting for <literal>ALTER TABLE
      .. SET ACCESS METHOD</literal> (Michael Paquier)
      </para>
     </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-10-16 [e83d1b0c4] Add support event triggers on authenticated login
-->

     <listitem>
      <para>
      Add support for <link linkend="sql-createeventtrigger">event
      triggers</link> that fire at connection time (Konstantin Knizhnik,
      Mikhail Gribkov)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-12-04 [f21848de2] Add support for REINDEX in event triggers
-->

     <listitem>
      <para>
      Add event trigger support for <link
      linkend="sql-reindex"><command>REINDEX</command></link> (Garrett
      Thornburg, Jian He)
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-07-19 [cdaedfc96] Support parenthesized syntax for CLUSTER without a table
-->

     <listitem>
      <para>
      Allow parenthesized syntax for <link
      linkend="sql-cluster"><command>CLUSTER</command></link> options if
      a table name is not specified (Nathan Bossart)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-datatypes">
    <title>Data Types</title>

    <itemizedlist>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2023-11-14 [519fc1bd9] Support +/- infinity in the interval data type.
-->

     <listitem>
      <para>
      Allow the <type>interval</type> data type to support
      <literal>+/-infinity</literal> values (Joseph Koshakow, Jian He,
      Ashutosh Bapat)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-03-24 [af1d39584] Allow more cases to pass the unsafe-use-of-new-enum-valu
-->

     <listitem>
      <para>
      Allow the use of an <link
      linkend="datatype-enum"><type>ENUM</type></link> added via <link
      linkend="sql-altertype"><command>ALTER TYPE</command></link> if
      the type was created in the same transaction (Tom Lane)
      </para>

      <para>
      This was previously disallowed.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-merge">
    <title><link linkend="sql-merge">MERGE</link></title>


    <itemizedlist>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2024-02-29 [5f2e179bd] Support MERGE into updatable views.
-->

     <listitem>
      <para>
      Allow <command>MERGE</command> to modify updatable views (Dean
      Rasheed)
      </para>
     </listitem>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2024-03-30 [0294df2f1] Add support for MERGE ... WHEN NOT MATCHED BY SOURCE.
-->

     <listitem>
      <para>
      Add <literal>WHEN NOT MATCHED BY SOURCE</literal> to
      <command>MERGE</command> (Dean Rasheed)
      </para>

      <para>
      <literal>WHEN NOT MATCHED</literal> on target rows was already
      supported.
      </para>
     </listitem>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2024-03-17 [c649fa24a] Add RETURNING support to MERGE.
-->

     <listitem>
      <para>
      Allow <command>MERGE</command> to use the
      <literal>RETURNING</literal> clause (Dean Rasheed)
      </para>

      <para>
      The new <literal>RETURNING</literal> function
      <function>merge_action()</function> reports on the
      <acronym>DML</acronym> that generated the row.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-functions">
    <title>Functions</title>

    <itemizedlist>

<!--
Author: Amit Langote <amitlan@postgresql.org>
2024-04-04 [de3600452] Add basic JSON_TABLE() functionality
Author: Amit Langote <amitlan@postgresql.org>
2024-04-08 [bb766cde6] JSON_TABLE: Add support for NESTED paths and columns
-->

     <listitem>
      <para>
      Add function <link
      linkend="functions-sqljson-table"><function>JSON_TABLE()</function></link>
      to convert <type>JSON</type> data to a table representation (Nikita
      Glukhov, Teodor Sigaev, Oleg Bartunov, Alexander Korotkov, Andrew
      Dunstan, Amit Langote, Jian He)
      </para>

      <para>
      This function can be used in the <literal>FROM</literal> clause of
      <command>SELECT</command> queries as a tuple source.
      </para>
     </listitem>

<!--
Author: Amit Langote <amitlan@postgresql.org>
2023-07-26 [03734a7fe] Add more SQL/JSON constructor functions
-->

     <listitem>
      <para>
      Add <acronym>SQL/JSON</acronym> constructor functions <link
      linkend="functions-json-creation-table"><function>JSON()</function></link>,
      <function>JSON_SCALAR()</function>, and
      <function>JSON_SERIALIZE()</function> (Nikita Glukhov, Teodor Sigaev,
      Oleg Bartunov, Alexander Korotkov, Andrew Dunstan, Amit Langote)
      </para>
     </listitem>

<!--
Author: Amit Langote <amitlan@postgresql.org>
2024-01-24 [aaaf9449e] Add soft error handling to some expression nodes
Author: Amit Langote <amitlan@postgresql.org>
2024-01-24 [1edb3b491] Adjust populate_record_field() to handle errors softly
Author: Amit Langote <amitlan@postgresql.org>
2024-03-21 [6185c9737] Add SQL/JSON query functions
Author: Amit Langote <amitlan@postgresql.org>
2024-04-18 [c0fc07518] SQL/JSON: Fix issues with DEFAULT .. ON ERROR / EMPTY
Author: Amit Langote <amitlan@postgresql.org>
2024-04-18 [ef744ebb7] SQL/JSON: Miscellaneous fixes and improvements
-->

     <listitem>
      <para>
      Add <acronym>SQL/JSON</acronym> query functions <link
      linkend="functions-sqljson-querying"><function>JSON_EXISTS()</function></link>,
      <function>JSON_QUERY()</function>, and
      <function>JSON_VALUE()</function> (Nikita Glukhov, Teodor Sigaev,
      Oleg Bartunov, Alexander Korotkov, Andrew Dunstan, Amit Langote,
      Peter Eisentraut, Jian He)
      </para>
     </listitem>

<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2024-01-25 [66ea94e8e] Implement various jsonpath methods
-->

     <listitem>
      <para>
      Add <link linkend="functions-sqljson-path-operators">jsonpath</link>
      methods to convert <type>JSON</type> values to other
      <type>JSON</type> data types (Jeevan Chalke)
      </para>

      <para>
      The jsonpath methods are <function>.bigint()</function>,
      <function>.boolean()</function>, <function>.date()</function>,
      <function>.decimal([precision [, scale]])</function>,
      <function>.integer()</function>, <function>.number()</function>,
      <function>.string()</function>, <function>.time()</function>,
      <function>.time_tz()</function>, <function>.timestamp()</function>,
      and <function>.timestamp_tz()</function>.
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-01-25 [8ba6fdf90] Support TZ and OF format codes in <function>to_timestamp()</function>.
-->

     <listitem>
      <para>
      Add <link
      linkend="functions-formatting-table"><function>to_timestamp()</function></link>
      time zone format specifiers (Tom Lane)
      </para>

      <para>
      <literal>TZ</literal> accepts time zone abbreviations or numeric
      offsets, while <literal>OF</literal> accepts only numeric offsets.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-13 [97957fdba] Add support for AT LOCAL
-->

     <listitem>
      <para>
      Allow the session <link linkend="guc-timezone">time zone</link>
      to be specified by <literal>AS LOCAL</literal> (Vik Fearing)
      </para>

      <para>
      This is useful when converting adding and removing time zones from
      time stamps values, rather than specifying the literal session
      time zone.
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-03-19 [794f10f6b] Add some UUID support functions
-->

     <listitem>
      <para>
      Add functions <link
      linkend="functions-uuid"><function>uuid_extract_timestamp()</function></link>
      and <function>uuid_extract_version()</function> to return
      <acronym>UUID</acronym> information (Andrey Borodin)
      </para>
     </listitem>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2024-03-27 [e6341323a] Add functions to generate random numbers in a specified
-->

     <listitem>
      <para>
      Add functions to generate random numbers in a specified range
      (Dean Rasheed)
      </para>

      <para>
      The functions are <link
      linkend="functions-math-random-table"><function>random(min,
      max)</function></link> and they take values of type
      <type>integer</type>, <type>bigint</type>, and <type>numeric</type>.
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-08-23 [260a1f18d] Add to_bin() and to_oct().
-->

     <listitem>
      <para>
      Add functions to convert integers to binary and octal strings
      (Eric Radman, Nathan Bossart)
      </para>

      <para>
      The functions are <link
      linkend="functions-string-other"><function>to_bin()</function></link>
      and <function>to_oct()</function>.
      </para>
     </listitem>

<!--
Author: Jeff Davis <jdavis@postgresql.org>
2023-11-01 [a02b37fc0] Additional unicode primitive functions.
-->

     <listitem>
      <para>
      Add Unicode informational functions (Jeff Davis)
      </para>

      <para>
      Function <link
      linkend="functions-info-version"><function>unicode_version()</function></link>
      returns the Unicode version,
      <function>icu_unicode_version()</function>
      returns the <acronym>ICU</acronym> version, and
      <function>unicode_assigned()</function> returns if the characters
      are assigned Unicode codepoints.
      </para>
     </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-11-06 [526fe0d79] Add XMLText function (SQL/XML X038)
-->

     <listitem>
      <para>
      Add function <link
      linkend="functions-producing-xml-xmltext"><function>xmltext()</function></link>
      to convert text to a single <type>XML</type> text node (Jim Jones)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-03-20 [1218ca995] Add to_regtypemod function to extract typemod from a str
-->

     <listitem>
      <para>
      Add function <link
      linkend="functions-info-catalog-table"><function>to_regtypemod()</function></link>
      to return the type modifier of a type specification (David Wheeler,
      Erik Wienhold)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-03-30 [b154d8a6d] Add pg_basetype() function to extract a domain's base ty
-->

     <listitem>
      <para>
      Add <link
      linkend="functions-info-catalog-table"><function>pg_basetype()</function></link>
      function to return a domain's base type (Steve Chavez)
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-14 [d1162cfda] Add pg_column_toast_chunk_id().
-->

     <listitem>
      <para>
      Add function <link
      linkend="functions-admin-dbsize"><function>pg_column_toast_chunk_id()</function></link>
      to return a value's <link
      linkend="storage-toast"><acronym>TOAST</acronym></link> identifier
      (Yugo Nagata)
      </para>

      <para>
      This returns <literal>NULL</literal> if the value is not stored
      in <acronym>TOAST</acronym>.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-plpgsql">
    <title><link linkend="plpgsql">PL/pgSQL</link></title>

    <itemizedlist>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-01-04 [5e8674dc8] In plpgsql, allow %TYPE and %ROWTYPE to be followed by a
-->

     <listitem>
      <para>
      Allow plpgsql <link
      linkend="plpgsql-declaration-type"><literal>%TYPE</literal></link>
      and <literal>%ROWTYPE</literal> specifications to represent arrays
      of non-array types (Quan Zongliang, Pavel Stehule)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-01-05 [43b46aae1] Clean up some edge cases in plpgsql's %TYPE parsing.
-->

     <listitem>
      <para>
      Allow plpgsql <literal>%TYPE</literal> specification to reference
      composite column (Tom Lane)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-libpq">
    <title><link linkend="libpq">libpq</link></title>

    <itemizedlist>

<!--
Author: Joe Conway <mail@joeconway.com>
2024-01-09 [a7be2a6c2] Add new function, PQchangePassword(), to libpq
-->

     <listitem>
      <para>
      Add libpq function to change role passwords (Joe Conway)
      </para>

      <para>
      The new function, <link
      linkend="libpq-PQchangePassword"><function>PQchangePassword()</function></link>,
      hashes the new password before sending it to the server.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-04 [28b572656] libpq: Add support for Close on portals and statements
-->

     <listitem>
      <para>
      Add libpq functions to close portals and prepared statements
      (Jelte Fennema-Nio)
      </para>

      <para>
      The functions are <link
      linkend="libpq-PQclosePrepared"><function>PQclosePrepared()</function></link>,
      <link
      linkend="libpq-PQclosePortal"><function>PQclosePortal()</function></link>,
      <link
      linkend="libpq-PQsendClosePrepared"><function>PQsendClosePrepared()</function></link>,
      and <link
      linkend="libpq-PQsendClosePortal"><function>PQsendClosePortal()</function></link>.
      </para>
     </listitem>

<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
2024-03-12 [61461a300] libpq: Add encrypted and non-blocking query cancellation
-->

     <listitem>
      <para>
      Add libpq <acronym>API</acronym> which allows for blocking and
      non-blocking <link linkend="libpq-cancel">cancel requests</link>,
      with encryption if already in use (Jelte Fennema-Nio)
      </para>

      <para>
      Previously only blocking, unencrypted cancel requests were supported.
      </para>
     </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2024-04-02 [f5e4dedfa] Expose PQsocketPoll via libpq
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-06-13 [105024a47] Improve the granularity of PQsocketPoll's timeout parame
-->

     <listitem>
      <para>
      Add libpq function <link
      linkend="libpq-PQsocketPoll"><function>PQsocketPoll</function></link>
      to allow polling of network sockets (Tristan Partin, Tom Lane)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2024-01-16 [4794c2d31] libpq: Add PQsendPipelineSync()
-->

     <listitem>
      <para>
      Add libpq function <link
      linkend="libpq-PQsendPipelineSync"><function>PQsendPipelineSync()</function></link>
      to send a pipeline synchronization point (Anton Kirilov)
      </para>

      <para>
      This is similar to <link
      linkend="libpq-PQpipelineSync"><function>PQpipelineSync()</function></link>
      but it does not flush to the server unless the size threshold of
      the output buffer is reached.
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-04-06 [4643a2b26] Support retrieval of results in chunks with libpq.
-->

     <listitem>
      <para>
      Add libpq function <link
      linkend="libpq-PQsetChunkedRowsMode"><function>PQsetChunkedRowsMode()</function></link>
      to allow retrieval of results in chunks (Daniel V&eacute;rit&eacute;)
      </para>
     </listitem>

<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-08 [d39a49c1e] Support TLS handshake directly without SSLRequest negoti
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-08 [91044ae4b] Send ALPN in TLS handshake, require it in direct SSL con
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2024-04-24 [44e27f0a6] Support disallowing SSL renegotiation when using LibreSS
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2024-04-24 [d80f2ce29] Support SSL_R_VERSION_TOO_LOW when using LibreSSL
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-29 [03a0e0d4b] libpq: Enforce ALPN in direct SSL connections
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-04-29 [17a834a04] Reject SSL connection if ALPN is used but there's no com
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-05-11 [407e0b023] Change ALPN protocol ID to IANA-approved "postgresql"
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-05-16 [fb5718f35] Remove option to fall back from direct to postgres SSL n
-->

     <listitem>
      <para>
      Allow <acronym>TLS</acronym> connections without requiring a
      network round-trip negotiation (Greg Stark, Heikki Linnakangas,
      Peter Eisentraut, Michael Paquier, Daniel Gustafsson)
      </para>

      <para>
      This is enabled with the client-side option <link
      linkend="libpq-connect-sslnegotiation"><literal>sslnegotiation=direct</literal></link>,
      requires <acronym>ALPN</acronym>, and only works on
      <productname>PostgreSQL</productname> 17 and later servers.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-psql">
     <title><xref linkend="app-psql"/></title>

     <itemizedlist>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-11-13 [d1379ebf4] Improve default and empty privilege outputs in psql.
-->

     <listitem>
      <para>
      Improve <application>psql</application> display of default and
      empty privileges (Erik Wienhold, Laurenz Albe)
      </para>

      <para>
      Command <literal>\dp</literal> now displays <literal>(none)</literal>
      for empty privileges;  default still display as empty.
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-11-13 [d1379ebf4] Improve default and empty privilege outputs in psql.
-->

     <listitem>
      <para>
      Have backslash commands honor <literal>\pset null</literal> (Erik
      Wienhold, Laurenz Albe)
      </para>

      <para>
      Previously <literal>\pset null</literal> was ignored.
      </para>
     </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-08-29 [f347ec76e] Allow \watch queries to stop on minimum rows returned
-->

     <listitem>
      <para>
      Allow <application>psql</application>'s <literal>\watch</literal>
      to stop after a minimum number of rows returned (Greg Sabino Mullane)
      </para>

      <para>
      The parameter is <literal>min_rows</literal>.
      </para>
     </listitem>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2024-04-02 [cafe10565] Allow SIGINT to cancel psql database reconnections.
-->

     <listitem>
      <para>
      Allow <application>psql</application> connections to be canceled
      with control-C (Tristan Partin)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-04-06 [90f517821] Re-implement psql's FETCH_COUNT feature atop libpq's chu
-->

     <listitem>
      <para>
      Allow <application>psql</application> to honor
      <literal>FETCH_COUNT</literal> for non-<command>SELECT</command>
      queries (Daniel V&eacute;rit&eacute;)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-06-30 [c951e9042] Add tab completion for CREATE SCHEMA in psql
Author: Michael Paquier <michael@paquier.xyz>
2023-10-13 [d16eb83ab] psql: Add completion support for AT [ LOCAL | TIME ZONE
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2023-11-28 [cd3424748] psql: Add tab completion for view options.
Author: Michael Paquier <michael@paquier.xyz>
2023-11-16 [816f10564] psql: Add some completion support for CREATE TABLE .. AS
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-03-16 [927332b95] psql: fix variable existence tab completion
Author: Masahiko Sawada <msawada@postgresql.org>
2024-03-28 [f1bb9284f] Improve tab completion for ALTER TABLE ALTER COLUMN SET
Author: Masahiko Sawada <msawada@postgresql.org>
2024-04-08 [304b6b1a6] Add more tab completion support for ALTER DEFAULT PRIVIL
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-04-30 [60ae37a8b] Add tab completion for partition MERGE/SPLIT operations
Author: Michael Paquier <michael@paquier.xyz>
2024-05-01 [2800fbb2b] Add tab completion for EXPLAIN (MEMORY|SERIALIZE)
-->

     <listitem>
      <para>
      Improve <application>psql</application> tab completion (Dagfinn
      Ilmari Manns&aring;ker, Gilles Darold, Christoph Heiss, Steve Chavez,
      Vignesh C, Pavel Borisov, Jian He)
      </para>
     </listitem>

      </itemizedlist>

    </sect3>

    <sect3 id="release-17-server-apps">
     <title>Server Applications</title>

     <itemizedlist>

<!--
Author: Robert Haas <rhaas@postgresql.org>
2024-01-11 [ee1bfd168] Add new pg_walsummary tool.
-->

     <listitem>
      <para>
      Add application <link
      linkend="app-pgwalsummary"><application>pg_walsummary</application></link>
      to dump <acronym>WAL</acronym> summary files (Robert Haas)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-04-01 [a45c78e32] Rearrange pg_dump's handling of large objects for better
-->

     <listitem>
      <para>
      Allow <link
      linkend="app-pgdump"><application>pg_dump</application></link>'s
      large objects to be restorable in batches (Tom Lane)
      </para>

      <para>
      This allows the restoration of many large objects to avoid
      transaction limits and to be restored in parallel.
      </para>
     </listitem>

<!--
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
2024-03-20 [522ed12f7] Add "- -exclude-extension" to pg_dump's options.
-->

     <listitem>
      <para>
      Add <application>pg_dump</application> option
      <option>--exclude-extension</option> (Ayush Vatsa)
      </para>
     </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-11-29 [a5cf808be] Read include/exclude commands for dump/restore from file
-->

     <listitem>
      <para>
      Allow <application>pg_dump</application>, <link
      linkend="app-pg-dumpall"><application>pg_dumpall</application></link>,
      and <link
      linkend="app-pgrestore"><application>pg_restore</application></link>
      to specify include/exclude objects in a file (Pavel Stehule,
      Daniel Gustafsson)
      </para>

      <para>
      The option is called <option>--filter</option>.
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-09-06 [8c16ad3b4] Allow using syncfs() in frontend utilities.
-->

     <listitem>
      <para>
      Add the <option>--sync-method</option> parameter to several client
      applications (Justin Pryzby, Nathan Bossart)
      </para>

      <para>
      The applications are <link
      linkend="app-initdb"><application>initdb</application></link>, <link
      linkend="app-pgbasebackup"><application>pg_basebackup</application></link>,
      <link
      linkend="app-pgchecksums"><application>pg_checksums</application></link>,
      <application>pg_dump</application>, <link
      linkend="app-pgrewind"><application>pg_rewind</application></link>,
      and <link
      linkend="pgupgrade"><application>pg_upgrade</application></link>.
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-04-01 [959b38d77] Invent - -transaction-size option for pg_restore.
-->

     <listitem>
      <para>
      Add <link
      linkend="app-pgrestore"><application>pg_restore</application></link>
      option <option>--transaction-size</option> to allow object restore
      in transaction batches (Tom Lane)
      </para>

      <para>
      This allows the performance benefits of transaction batches without
      the problems of excessively large transaction blocks.
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-25 [3ff01b2b6] Adjust pgbench option for debug mode.
-->

     <listitem>
      <para>
      Change <link
      linkend="pgbench"><application>pgbench</application></link> debug
      mode option from <option>-d</option> to <option>--debug</option>
      (Greg Sabino Mullane)
      </para>

      <para>
      Option <option>-d</option> is now used for the database name,
      and the new <option>--dbname</option> option can be used as well.
      </para>
     </listitem>

<!--
Author: Tatsuo Ishii <ishii@postgresql.org>
2023-08-30 [3c662643c] Allow pgbench to exit immediately when any client is abo
-->

     <listitem>
      <para>
      Add pgbench option <option>--exit-on-abort</option> to exit after
      any client aborts (Yugo Nagata)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2024-01-24 [94edfe250] pgbench: Add \syncpipeline
-->

     <listitem>
      <para>
      Add pgbench command \syncpipeline to allow sending of sync messages
      (Anthonin Bonnefoy)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-19 [3f8c98d0b] pg_archivecleanup: Add - -clean-backup-history
-->

     <listitem>
      <para>
      Allow <link
      linkend="pgarchivecleanup"><application>pg_archivecleanup</application></link>
      to remove backup history files (Atsushi Torikoshi)
      </para>

      <para>
      The option is <option>--clean-backup-history</option>.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-06-30 [dd7c60f19] Introduce long options in pg_archivecleanup
-->

     <listitem>
      <para>
      Add some long options to <application>pg_archivecleanup</application>
      (Atsushi Torikoshi)
      </para>

      <para>
      The long options are <option>--debug</option>,
      <option>--dry-run</option>, and <option>--strip-extension</option>.
      </para>
     </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-09-21 [cca97ce6a] Allow dbname in pg_basebackup/pg_receivewal connstring
-->

     <listitem>
      <para>
      Allow <link
      linkend="app-pgbasebackup"><application>pg_basebackup</application></link>
      and <link
      linkend="app-pgreceivewal"><application>pg_receivewal</application></link>
      to use dbname in their connection specification (Jelte Fennema-Nio)
      </para>

      <para>
      This is useful for connection poolers that are sensitive to the
      database name.
      </para>
     </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2024-03-06 [d93627bcb] Add - -copy-file-range option to pg_upgrade.
-->

     <listitem>
      <para>
      Add <link
      linkend="pgupgrade"><application>pg_upgrade</application></link>
      option <option>--copy-file-range</option> (Thomas Munro)
      </para>

      <para>
      This is supported on <systemitem class="osname">Linux</systemitem>
      and <systemitem class="osname">FreeBSD</systemitem>.
      </para>
     </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2024-03-25 [47f99a407] reindexdb: Add the index-level REINDEX with multiple job
-->

     <listitem>
      <para>
      Allow <link
      linkend="app-reindexdb"><application>reindexdb</application></link>
      <option>--index</option> to process indexes from different tables
      in parallel (Maxim Orlov, Svetlana Derevyanko, Alexander Korotkov)
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-11 [24c928ad9] reindexdb: Allow specifying objects to process in all da
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-11 [648928c79] vacuumdb: Allow specifying objects to process in all dat
Author: Nathan Bossart <nathan@postgresql.org>
2024-03-11 [1b49d56d3] clusterdb: Allow specifying tables to process in all dat
-->

     <listitem>
      <para>
      Allow <link linkend="app-reindexdb">reindexdb</link>,
      <link linkend="app-vacuumdb">vacuumdb</link>, and <link
      linkend="app-clusterdb">clusterdb</link> to process objects in all
      databases matching a pattern (Nathan Bossart)
      </para>

      <para>
      The new option <option>--all</option> controls this behavior.
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-source-code">
    <title>Source Code</title>

    <itemizedlist>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-03 [8e278b657] Remove support for OpenSSL 1.0.1
-->

     <listitem>
      <para>
      Remove support for <productname>OpenSSL</productname> 1.0.1
      (Michael Paquier)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2023-11-17 [284cbaea7] Allow tests to pass in OpenSSL FIPS mode (TAP tests)
Author: Peter Eisentraut <peter@eisentraut.org>
2023-11-17 [3c44e7d8d] Allow tests to pass in OpenSSL FIPS mode (rest)
-->

     <listitem>
      <para>
      Allow tests to pass in <productname>OpenSSL</productname>
      <acronym>FIPS</acronym> mode (Peter Eisentraut)
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-04-06 [792752af4] Optimize pg_popcount() with AVX-512 instructions.
Author: Nathan Bossart <nathan@postgresql.org>
2024-04-06 [41c51f0c6] Optimize visibilitymap_count() with AVX-512 instructions
-->

     <listitem>
      <para>
      Use <acronym>CPU AVX</acronym>-512 instructions for bit counting
      (Paul Amonson, Nathan Bossart, Ants Aasma)
      </para>
     </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2024-01-25 [820b5af73] jit: Require at least LLVM 10.
-->

     <listitem>
      <para>
      Require <productname><acronym>LLVM</acronym></productname> version
      10 or later (Thomas Munro)
      </para>
     </listitem>

<!--
Author: John Naylor <john.naylor@postgresql.org>
2023-08-10 [4d14ccd6a] Use native CRC instructions on 64-bit LoongArch
-->

     <listitem>
      <para>
      Use native <acronym>CRC</acronym> instructions on 64-bit
      <productname>LoongArch</productname> CPUs (Xudong Yang)
      </para>
     </listitem>

<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-02-28 [0b16bb877] Remove AIX support
-->

     <listitem>
      <para>
      Remove <systemitem class="osname"><acronym>AIX</acronym></systemitem>
      support (Heikki Linnakangas)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-12-20 [1301c80b2] Remove MSVC scripts
-->

     <listitem>
      <para>
      Remove the <productname>Microsoft Visual
      Studio</productname>-specific <productname>PostgreSQL</productname>
      build option (Michael Paquier)
      </para>

      <para>
      <productname>Meson</productname> is now the only available method
      for <productname>Visual Studio</productname> builds.
      </para>
     </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2023-07-12 [68a4b58ec] Remove - -disable-thread-safety and related code.
Author: Thomas Munro <tmunro@postgresql.org>
2023-07-12 [ce0b0fa3e] Doc: Adjust libpq docs about thread safety.
-->

     <listitem>
      <para>
      Remove configure option <option>--disable-thread-safety</option>
      (Thomas Munro, Heikki Linnakangas)
      </para>

      <para>
      We now assume all supported platforms have sufficient thread support.
      </para>
     </listitem>

<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2024-02-28 [1c1eec0f2] Remove configure - -with-CC option
-->

     <listitem>
      <para>
      Remove <application>configure</application> option
      <option>--with-CC</option> (Heikki Linnakangas)
      </para>

      <para>
      Setting the <envar>CC</envar> environment variable is now the only
      supported method for specifying the compiler.
      </para>
     </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2023-10-26 [f0efa5aec] Introduce the concept of read-only StringInfos
-->

     <listitem>
      <para>
      User-defined data type receive functions will no longer receive
      their data null-terminated (David Rowley)
      </para>
     </listitem>

<!--
Author: Andrew Dunstan <andrew@dunslane.net>
2024-04-04 [3311ea86e] Introduce a non-recursive JSON parser
-->

     <listitem>
      <para>
      Add incremental <type>JSON</type> parser for use with huge
      <type>JSON</type> documents (Andrew Dunstan)
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2024-02-28 [363eb0599] Convert README to Markdown.
-->

     <listitem>
      <para>
      Convert top-level <filename>README</filename> file to
      <productname>Markdown</productname> (Nathan Bossart)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-12-22 [e2b73f4a4] Stop generating plain-text INSTALL instructions.
-->

     <listitem>
      <para>
      Remove no longer needed top-level <filename>INSTALL</filename> file
      (Tom Lane)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2023-11-06 [721856ff2] Remove distprep
-->

     <listitem>
      <para>
      Remove <application>make</application>'s <literal>distprep</literal>
      option (Peter Eisentraut)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2024-01-23 [79b03dbb3] Support shared libraries on Android (using make)
-->

     <listitem>
      <para>
      Add  <application>make</application> support for
      <productname>Android</productname> shared libraries (Peter
      Eisentraut)
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2024-01-22 [d86d20f0b] Add backend support for injection points
Author: Michael Paquier <michael@paquier.xyz>
2024-03-04 [37b369dc6] injection_points: Add wait and wakeup of processes
Author: Michael Paquier <michael@paquier.xyz>
2024-04-08 [f587338de] injection_points: Introduce runtime conditions
-->

     <listitem>
      <para>
      Add backend support for injection points (Michael Paquier)
      </para>

      <para>
      This is used for server debugging and they must be enabled at server
      compile time.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2024-04-04 [2a217c371] Coordinate emit_log_hook and all log destinations to sha
-->

     <listitem>
      <para>
      Fix <literal>emit_log_hook</literal> to use the same time value as
      other log records for the same query (Kambam Vinay, Michael Paquier)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-01-25 [7014c9a4b] Doc: improve documentation for jsonpath behavior.
-->

     <listitem>
      <para>
      Improve documentation for using <literal>jsonpath</literal> for
      predicate checks (David Wheeler)
      </para>
     </listitem>

    </itemizedlist>

   </sect3>

   <sect3 id="release-17-modules">
    <title>Additional Modules</title>

    <itemizedlist>

<!--
Author: Etsuro Fujita <efujita@postgresql.org>
2023-08-15 [9e9931d2b] Re-allow FDWs and custom scan providers to replace joins
-->

     <listitem>
      <para>
      Allow joins with non-join qualifications to be pushed down to
      foreign servers and custom scans (Richard Guo, Etsuro Fujita)
      </para>

      <para>
      Foreign data wrappers and custom scans will need to be modified to
      handle these cases.
      </para>
     </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-12-05 [824dbea3e] Add support for deparsing semi-joins to contrib/postgres
-->

     <listitem>
      <para>
      Allow pushdown of <literal>EXISTS</literal> and <literal>IN</literal>
      subqueries to the <xref linkend="postgres-fdw"/> foreign server
      (Alexander Pyhalov)
      </para>
     </listitem>

<!--
Author: David Rowley <drowley@postgresql.org>
2023-11-02 [cac169d68] Increase DEFAULT_FDW_TUPLE_COST from 0.01 to 0.2
Author: John Naylor <john.naylor@postgresql.org>
2024-01-11 [f7f694b21] Update documentation of default fdw_tuple_cost
-->

     <listitem>
      <para>
      Increase the default foreign data wrapper tuple cost (David Rowley,
      Umair Shahid)
      </para>

      <para>
      This value is used by the optimizer.
      </para>
     </listitem>

<!--
Author: Noah Misch <noah@leadboat.com>
2024-01-08 [d3c5f37dd] Make dblink interruptible, via new libpqsrv APIs.
-->

     <listitem>
      <para>
      Allow <link linkend="dblink"><application>dblink</application></link>
      database operations to be interrupted (Noah Misch)
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2024-03-21 [485f0aa85] Add hash support functions and hash opclass for contrib/
-->

     <listitem>
      <para>
      Allow the creation of hash indexes on <application><xref
      linkend="ltree"/></application> columns (Tommy Pavlicek)
      </para>

      <para>
      This also enables hash join and hash aggregation on
      <application>ltree</application> columns.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-09-20 [59f47fb98] unaccent: Add support for quoted translated characters
-->

     <listitem>
      <para>
      Allow <application><xref linkend="unaccent"/></application> character
      translation rules to contain whitespace and quotes (Michael Paquier)
      </para>

      <para>
      The syntax for the <filename>unaccent.rules</filename> file has
      changed.
      </para>
     </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-10-28 [5ae208720] Teach contrib/amcheck to check the unique constraint vio
-->

     <listitem>
      <para>
      Allow <application><xref linkend="amcheck"/></application> to
      check for unique constraint violations (Anastasia Lubennikova,
      Pavel Borisov, Maxim Orlov)
      </para>

      <para>
      The <application>pg_amcheck</application> option
      <option>--checkunique</option> will check all unique indexes.
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2023-11-07 [3c551ebed] citext: Allow tests to pass in OpenSSL FIPS mode
-->

     <listitem>
      <para>
      Allow <application><xref linkend="citext"/></application> tests to
      pass in OpenSSL <acronym>FIPS</acronym> mode (Peter Eisentraut)
      </para>
     </listitem>

<!--
Author: Peter Eisentraut <peter@eisentraut.org>
2023-11-17 [795592865] pgcrypto: Allow tests to pass in OpenSSL FIPS mode
-->

     <listitem>
      <para>
      Allow <application><xref linkend="pgcrypto"/></application> tests
      to pass in OpenSSL <acronym>FIPS</acronym> mode (Peter Eisentraut)
      </para>
     </listitem>

<!--
Author: Nathan Bossart <nathan@postgresql.org>
2023-11-27 [75680c3d8] Retire a few backwards compatibility macros.
-->

     <listitem>
      <para>
      Remove some unused <link linkend="spi"><acronym>SPI</acronym></link>
      macros (Bharath Rupireddy)
      </para>
     </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2024-03-04 [cc09e6549] Remove the adminpack contrib extension
-->

     <listitem>
      <para>
      Remove <application>adminpack</application> contrib extension
      (Daniel Gustafsson)
      </para>

      <para>
      This was used by now end-of-life <productname>pgAdmin
      III</productname>.
      </para>
     </listitem>

<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2023-10-20 [2b5154bea] Extend ALTER OPERATOR to allow setting more optimization
-->

     <listitem>
      <para>
      Allow <link linkend="sql-alteroperator"><command>ALTER
      OPERATOR</command></link> to set more optimization attributes
      (Tommy Pavlicek)
      </para>

      <para>
      This is useful for extensions.
      </para>
     </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-31 [c9af05465] Support custom wait events for wait event type "Extensio
Author: Michael Paquier <michael@paquier.xyz>
2023-10-04 [c8e318b1b] worker_spi: Rename custom wait event to "WorkerSpiMain"
Author: Michael Paquier <michael@paquier.xyz>
2023-10-05 [d61f2538a] postgres_fdw: Replace WAIT_EVENT_EXTENSION with custom w
Author: Michael Paquier <michael@paquier.xyz>
2023-10-05 [c789f0f6c] dblink: Replace WAIT_EVENT_EXTENSION with custom wait ev
-->

     <listitem>
      <para>
      Allow extensions to define <link
      linkend="xfunc-addin-wait-events">custom wait events</link>
      (Masahiro Ikeda)
      </para>

      <para>
      Custom wait events have been added to <application><xref
      linkend="postgres-fdw"/></application> and <application><xref
      linkend="dblink"/></application>.
      </para>
     </listitem>

<!--
Author: Thomas Munro <tmunro@postgresql.org>
2024-04-08 [13453eedd] Add pg_buffercache_evict() function for testing.
-->

     <listitem>
      <para>
      Add <application><xref linkend="pgbuffercache"/></application>
      function <function>pg_buffercache_evict()</function> to allow shared
      buffer eviction (Palak Chaturvedi, Thomas Munro)
      </para>

      <para>
      This is useful for testing.
      </para>
     </listitem>

    </itemizedlist>

    <sect4 id="release-17-pgstatstatements">
     <title><link linkend="pgstatstatements"><application>pg_stat_statements</application></link></title>

     <itemizedlist>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-09-28 [11c34b342] Show parameters of CALL as constants in pg_stat_statemen
-->

      <listitem>
       <para>
       Replace <link linkend="sql-call"><command>CALL</command></link>
       parameters in <application>pg_stat_statements</application> with
       placeholders (Sami Imseih)
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-07-27 [31de7e60d] Show savepoint names as constants in pg_stat_statements
-->

      <listitem>
       <para>
       Replace savepoint names stored in
       <structname>pg_stat_statements</structname> with placeholders
       (Greg Sabino Mullane)
       </para>

       <para>
       This greatly reduces the number of entries needed to record <link
       linkend="sql-savepoint"><command>SAVEPOINT</command></link>,
       <link linkend="sql-release-savepoint"><command>RELEASE
       SAVEPOINT</command></link>, and <link
       linkend="sql-rollback-to"><command>ROLLBACK TO
       SAVEPOINT</command></link> commands.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-08-12 [638d42a3c] Show GIDs of two-phase commit commands as constants in p
-->

      <listitem>
       <para>
       Replace the two-phase commit <acronym>GID</acronym>s stored in
       <structname>pg_stat_statements</structname> with placeholders
       (Michael Paquier)
       </para>

       <para>
       This greatly reduces the number of entries needed to record
       <link linkend="sql-prepare-transaction"><command>PREPARE
       TRANSACTION</command></link>, <link
       linkend="sql-commit-prepared"><command>COMMIT
       PREPARED</command></link>, and <link
       linkend="sql-rollback-prepared"><command>ROLLBACK
       PREPARED</command></link>.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-08-27 [bb45156f3] Show names of DEALLOCATE as constants in pg_stat_stateme
-->

      <listitem>
       <para>
       Track <link
       linkend="sql-deallocate"><command>DEALLOCATE</command></link>
       in <structname>pg_stat_statements</structname> (Dagfinn Ilmari
       Manns&aring;ker, Michael Paquier)
       </para>

       <para>
       <command>DEALLOCATE</command> names are stored in
       <structname>pg_stat_statements</structname> as placeholders.
       </para>
      </listitem>

<!--
Author: Michael Paquier <michael@paquier.xyz>
2023-10-19 [295c36c0c] Add local_blk_{read|write}_time I/O timing statistics fo
Author: Michael Paquier <michael@paquier.xyz>
2023-10-19 [5147ab1dd] pg_stat_statements: Add local_blk_{read|write}_time
-->

      <listitem>
       <para>
       Add local I/O block read/write timing statistics columns of
       <structname>pg_stat_statements</structname> (Nazir Bilal Yavuz)
       </para>

       <para>
       The new columns are <structfield>local_blk_read_time</structfield>
       and <structfield>local_blk_write_time</structfield>.
       </para>
      </listitem>

<!--
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
2023-09-08 [5a3423ad8] Add JIT deform_counter
-->

      <listitem>
       <para>
       Add <acronym>JIT</acronym> deform_counter details to
       <structname>pg_stat_statements</structname> (Dmitry Dolgov)
       </para>
      </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-11-27 [dc9f8a798] Track statement entry timestamp in contrib/pg_stat_state
-->

      <listitem>
       <para>
       Add optional fourth argument (<literal>minmax_only</literal>)
       to <function>pg_stat_statements_reset()</function> to allow for
       the resetting of only min/max statistics (Andrei Zubkov)
       </para>

       <para>
       This argument defaults to <literal>false</literal>.
       </para>
      </listitem>

<!--
Author: Alexander Korotkov <akorotkov@postgresql.org>
2023-11-27 [dc9f8a798] Track statement entry timestamp in contrib/pg_stat_state
-->

      <listitem>
       <para>
       Add <structname>pg_stat_statements</structname>
       columns <structfield>stats_since</structfield> and
       <structfield>minmax_stats_since</structfield> to track entry
       creation time and last min/max reset time (Andrei Zubkov)
       </para>
      </listitem>

     </itemizedlist>

    </sect4>

   </sect3>

  </sect2>

  <sect2 id="release-17-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>