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diff --git a/doc/src/sgml/html/release-16.html b/doc/src/sgml/html/release-16.html new file mode 100644 index 0000000..9fe90bc --- /dev/null +++ b/doc/src/sgml/html/release-16.html @@ -0,0 +1,1155 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>E.3. Release 16</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="release-16-1.html" title="E.2. Release 16.1" /><link rel="next" href="release-prior.html" title="E.4. Prior Releases" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">E.3. Release 16</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-16-1.html" title="E.2. Release 16.1">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><th width="60%" align="center">Appendix E. Release Notes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="release-prior.html" title="E.4. Prior Releases">Next</a></td></tr></table><hr /></div><div class="sect1" id="RELEASE-16"><div class="titlepage"><div><div><h2 class="title" style="clear: both">E.3. Release 16 <a href="#RELEASE-16" class="id_link">#</a></h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="release-16.html#RELEASE-16-HIGHLIGHTS">E.3.1. Overview</a></span></dt><dt><span class="sect2"><a href="release-16.html#RELEASE-16-MIGRATION">E.3.2. Migration to Version 16</a></span></dt><dt><span class="sect2"><a href="release-16.html#RELEASE-16-CHANGES">E.3.3. Changes</a></span></dt><dt><span class="sect2"><a href="release-16.html#RELEASE-16-ACKNOWLEDGEMENTS">E.3.4. Acknowledgments</a></span></dt></dl></div><p><strong>Release date: </strong>2023-09-14</p><div class="sect2" id="RELEASE-16-HIGHLIGHTS"><div class="titlepage"><div><div><h3 class="title">E.3.1. Overview <a href="#RELEASE-16-HIGHLIGHTS" class="id_link">#</a></h3></div></div></div><p> + <span class="productname">PostgreSQL</span> 16 contains many new features + and enhancements, including: + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow parallelization of <code class="literal">FULL</code> and internal right <code class="literal">OUTER</code> hash joins + </p></li><li class="listitem"><p> + Allow logical replication from standby servers + </p></li><li class="listitem"><p> + Allow logical replication subscribers to apply large transactions in parallel + </p></li><li class="listitem"><p> + Allow monitoring of <acronym class="acronym">I/O</acronym> statistics using the new <code class="structname">pg_stat_io</code> view + </p></li><li class="listitem"><p> + Add <acronym class="acronym">SQL/JSON</acronym> constructors and identity functions + </p></li><li class="listitem"><p> + Improve performance of vacuum freezing + </p></li><li class="listitem"><p> + Add support for regular expression matching of user and database names in <code class="filename">pg_hba.conf</code>, and user names in <code class="filename">pg_ident.conf</code> + </p></li></ul></div><p> + The above items and other new features of + <span class="productname">PostgreSQL</span> 16 are explained in more detail + in the sections below. + </p></div><div class="sect2" id="RELEASE-16-MIGRATION"><div class="titlepage"><div><div><h3 class="title">E.3.2. Migration to Version 16 <a href="#RELEASE-16-MIGRATION" class="id_link">#</a></h3></div></div></div><p> + A dump/restore using <a class="xref" href="app-pg-dumpall.html" title="pg_dumpall"><span class="refentrytitle"><span class="application">pg_dumpall</span></span></a> or use of + <a class="xref" href="pgupgrade.html" title="pg_upgrade"><span class="refentrytitle"><span class="application">pg_upgrade</span></span></a> or logical replication is required for + those wishing to migrate data from any previous release. See <a class="xref" href="upgrading.html" title="19.6. Upgrading a PostgreSQL Cluster">Section 19.6</a> for general information on migrating to new + major releases. + </p><p> + Version 16 contains a number of changes that may affect compatibility + with previous releases. Observe the following incompatibilities: + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Change assignment rules for <a class="link" href="plpgsql-cursors.html#PLPGSQL-OPEN-BOUND-CURSOR" title="43.7.2.3. Opening a Bound Cursor"><span class="application">PL/pgSQL</span></a> + bound cursor variables (Tom Lane) + </p><p> + Previously, the string value of such variables + was set to match the variable name during cursor + assignment; now it will be assigned during <a class="link" href="plpgsql-cursors.html#PLPGSQL-CURSOR-OPENING" title="43.7.2. Opening Cursors"><code class="command">OPEN</code></a>, + and will not match the variable name. To restore the previous + behavior, assign the desired portal name to the cursor variable + before <code class="command">OPEN</code>. + </p></li><li class="listitem"><p> + Disallow <a class="link" href="sql-createindex.html" title="CREATE INDEX"><code class="literal">NULLS NOT + DISTINCT</code></a> indexes for primary keys (Daniel + Gustafsson) + </p></li><li class="listitem"><p> + Change <a class="link" href="sql-reindex.html" title="REINDEX"><code class="command">REINDEX + DATABASE</code></a> and <a class="link" href="app-reindexdb.html" title="reindexdb"><span class="application">reindexdb</span></a> + to not process indexes on system catalogs (Simon Riggs) + </p><p> + Processing such indexes is still possible using <code class="command">REINDEX + SYSTEM</code> and <a class="link" href="app-reindexdb.html" title="reindexdb"><code class="command">reindexdb + --system</code></a>. + </p></li><li class="listitem"><p> + Tighten <a class="link" href="ddl-generated-columns.html" title="5.3. Generated Columns"><code class="literal">GENERATED</code></a> + expression restrictions on inherited and partitioned tables (Amit + Langote, Tom Lane) + </p><p> + Columns of parent/partitioned and child/partition tables must all + have the same generation status, though now the actual generation + expressions can be different. + </p></li><li class="listitem"><p> + Remove <a class="link" href="pgwalinspect.html" title="F.37. pg_walinspect — low-level WAL inspection"><span class="application">pg_walinspect</span></a> + functions + <code class="function">pg_get_wal_records_info_till_end_of_wal()</code> + and <code class="function">pg_get_wal_stats_till_end_of_wal()</code> + (Bharath Rupireddy) + </p></li><li class="listitem"><p> + Rename server variable + <code class="varname">force_parallel_mode</code> to <a class="link" href="runtime-config-developer.html#GUC-DEBUG-PARALLEL-QUERY"><code class="varname">debug_parallel_query</code></a> + (David Rowley) + </p></li><li class="listitem"><p> + Remove the ability to <a class="link" href="sql-createview.html" title="CREATE VIEW">create + views</a> manually with <code class="literal">ON SELECT</code> rules + (Tom Lane) + </p></li><li class="listitem"><p> + Remove the server variable + <code class="varname">vacuum_defer_cleanup_age</code> (Andres Freund) + </p><p> + This has been unnecessary since <a class="link" href="runtime-config-replication.html#GUC-HOT-STANDBY-FEEDBACK"><code class="varname">hot_standby_feedback</code></a> + and <a class="link" href="warm-standby.html#STREAMING-REPLICATION-SLOTS" title="27.2.6. Replication Slots">replication + slots</a> were added. + </p></li><li class="listitem"><p> + Remove server variable <code class="varname">promote_trigger_file</code> + (Simon Riggs) + </p><p> + This was used to promote a standby to primary, but is now more easily + accomplished with <a class="link" href="app-pg-ctl.html" title="pg_ctl"><code class="literal">pg_ctl + promote</code></a> or <a class="link" href="functions-admin.html#FUNCTIONS-RECOVERY-CONTROL-TABLE" title="Table 9.93. Recovery Control Functions"><code class="function">pg_promote()</code></a>. + </p></li><li class="listitem"><p> + Remove read-only server variables <code class="varname">lc_collate</code> + and <code class="varname">lc_ctype</code> (Peter Eisentraut) + </p><p> + Collations and locales can vary between databases so having them + as read-only server variables was unhelpful. + </p></li><li class="listitem"><p> + Role inheritance now controls the default + inheritance status of member roles added during <a class="link" href="sql-grant.html" title="GRANT"><code class="command">GRANT</code></a> (Robert Haas) + </p><p> + The role's default inheritance behavior can be overridden with the + new <code class="command">GRANT ... WITH INHERIT</code> clause. This allows + inheritance of some roles and not others because the members' + inheritance status is set at <code class="command">GRANT</code> time. + Previously the inheritance status of member roles was controlled + only by the role's inheritance status, and changes to a role's + inheritance status affected all previous and future member roles. + </p></li><li class="listitem"><p> + Restrict the privileges of <a class="link" href="sql-createrole.html" title="CREATE ROLE"><code class="literal">CREATEROLE</code></a> + and its ability to modify other roles (Robert Haas) + </p><p> + Previously roles with <code class="literal">CREATEROLE</code> privileges could + change many aspects of any non-superuser role. Such changes, + including adding members, now require the role requesting + the change to have <code class="literal">ADMIN OPTION</code> permission. + For example, they can now change the <code class="literal">CREATEDB</code>, + <code class="literal">REPLICATION</code>, and <code class="literal">BYPASSRLS</code> + properties only if they also have those permissions. + </p></li><li class="listitem"><p> + Remove symbolic links for the <span class="application">postmaster</span> + binary (Peter Eisentraut) + </p></li></ul></div></div><div class="sect2" id="RELEASE-16-CHANGES"><div class="titlepage"><div><div><h3 class="title">E.3.3. Changes <a href="#RELEASE-16-CHANGES" class="id_link">#</a></h3></div></div></div><p> + Below you will find a detailed account of the changes between + <span class="productname">PostgreSQL</span> 16 and the previous major + release. + </p><div class="sect3" id="RELEASE-16-SERVER"><div class="titlepage"><div><div><h4 class="title">E.3.3.1. Server <a href="#RELEASE-16-SERVER" class="id_link">#</a></h4></div></div></div><div class="sect4" id="RELEASE-16-OPTIMIZER"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.1. Optimizer <a href="#RELEASE-16-OPTIMIZER" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow incremental sorts in more cases, including + <code class="literal">DISTINCT</code> (David Rowley) + </p></li><li class="listitem"><p> + Add the ability for aggregates having <code class="literal">ORDER BY</code> + or <code class="literal">DISTINCT</code> to use pre-sorted data (David + Rowley) + </p><p> + The new server variable <a class="link" href="runtime-config-query.html#GUC-ENABLE-PRESORTED-AGGREGATE"><code class="varname">enable_presorted_aggregate</code></a> + can be used to disable this. + </p></li><li class="listitem"><p> + Allow memoize atop a <code class="literal">UNION ALL</code> (Richard Guo) + </p></li><li class="listitem"><p> + Allow anti-joins to be performed with the non-nullable input as + the inner relation (Richard Guo) + </p></li><li class="listitem"><p> + Allow parallelization of <a class="link" href="queries-table-expressions.html#QUERIES-JOIN" title="7.2.1.1. Joined Tables"><code class="literal">FULL</code></a> and internal + right <code class="literal">OUTER</code> hash joins (Melanie Plageman, + Thomas Munro) + </p></li><li class="listitem"><p> + Improve the accuracy of <a class="link" href="gin.html" title="Chapter 70. GIN Indexes"><code class="literal">GIN</code></a> index access optimizer + costs (Ronan Dunklau) + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-PERFORMANCE"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.2. General Performance <a href="#RELEASE-16-PERFORMANCE" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow more efficient addition of heap and index pages (Andres + Freund) + </p></li><li class="listitem"><p> + During non-freeze operations, perform page <a class="link" href="routine-vacuuming.html#VACUUM-FOR-WRAPAROUND" title="25.1.5. Preventing Transaction ID Wraparound Failures">freezing</a> where appropriate + (Peter Geoghegan) + </p><p> + This makes full-table freeze vacuums less necessary. + </p></li><li class="listitem"><p> + Allow window functions to use the faster <a class="link" href="sql-expressions.html#SYNTAX-WINDOW-FUNCTIONS" title="4.2.8. Window Function Calls"><code class="literal">ROWS</code></a> + mode internally when <code class="literal">RANGE</code> mode is active but + unnecessary (David Rowley) + </p></li><li class="listitem"><p> + Allow optimization of always-increasing window functions <a class="link" href="functions-window.html#FUNCTIONS-WINDOW-TABLE" title="Table 9.64. General-Purpose Window Functions"><code class="function">ntile()</code></a>, + <code class="function">cume_dist()</code> and + <code class="function">percent_rank()</code> (David Rowley) + </p></li><li class="listitem"><p> + Allow aggregate functions <a class="link" href="functions-aggregate.html#FUNCTIONS-AGGREGATE-TABLE" title="Table 9.59. General-Purpose Aggregate Functions"><code class="function">string_agg()</code></a> + and <code class="function">array_agg()</code> to be parallelized (David + Rowley) + </p></li><li class="listitem"><p> + Improve performance by caching <a class="link" href="ddl-partitioning.html#DDL-PARTITIONING-OVERVIEW" title="5.11.1. Overview"><code class="literal">RANGE</code></a> + and <code class="literal">LIST</code> partition lookups (Amit Langote, + Hou Zhijie, David Rowley) + </p></li><li class="listitem"><p> + Allow control of the shared buffer usage by vacuum and analyze + (Melanie Plageman) + </p><p> + The <a class="link" href="sql-vacuum.html" title="VACUUM"><code class="command">VACUUM</code></a>/<a class="link" href="sql-analyze.html" title="ANALYZE"><code class="command">ANALYZE</code></a> + option is <code class="literal">BUFFER_USAGE_LIMIT</code>, and the <a class="link" href="app-vacuumdb.html" title="vacuumdb"><span class="application">vacuumdb</span></a> + option is <code class="option">--buffer-usage-limit</code>. + The default value is set by server variable <a class="link" href="runtime-config-resource.html#GUC-VACUUM-BUFFER-USAGE-LIMIT"><code class="varname">vacuum_buffer_usage_limit</code></a>, + which also controls autovacuum. + </p></li><li class="listitem"><p> + Support <a class="link" href="runtime-config-wal.html#GUC-WAL-SYNC-METHOD"><code class="literal">wal_sync_method=fdatasync</code></a> + on <span class="systemitem">Windows</span> (Thomas Munro) + </p></li><li class="listitem"><p> + Allow <a class="link" href="storage-hot.html" title="73.7. Heap-Only Tuples (HOT)"><acronym class="acronym">HOT</acronym></a> + updates if only <code class="literal">BRIN</code>-indexed columns are updated + (Matthias van de Meent, Josef Simanek, Tomas Vondra) + </p></li><li class="listitem"><p> + Improve the speed of updating the <a class="link" href="runtime-config-logging.html#GUC-UPDATE-PROCESS-TITLE">process title</a> (David + Rowley) + </p></li><li class="listitem"><p> + Allow <code class="type">xid</code>/<code class="type">subxid</code> searches and + <acronym class="acronym">ASCII</acronym> string detection to use vector operations + (Nathan Bossart, John Naylor) + </p><p> + <acronym class="acronym">ASCII</acronym> detection is particularly useful for + <a class="link" href="sql-copy.html" title="COPY"><code class="command">COPY FROM</code></a>. + Vector operations are also used for some C array searches. + </p></li><li class="listitem"><p> + Reduce overhead of memory allocations (Andres Freund, David Rowley) + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-MONITORING"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.3. Monitoring <a href="#RELEASE-16-MONITORING" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add system view <a class="link" href="monitoring-stats.html#MONITORING-PG-STAT-IO-VIEW" title="28.2.13. pg_stat_io"><code class="structname">pg_stat_io</code></a> + view to track <acronym class="acronym">I/O</acronym> statistics (Melanie Plageman) + </p></li><li class="listitem"><p> + Record statistics on the last sequential and index scans on tables + (Dave Page) + </p><p> + This information appears in <a class="link" href="monitoring-stats.html#PG-STAT-ALL-TABLES-VIEW" title="Table 28.28. pg_stat_all_tables View"><code class="structname">pg_stat_*_tables</code></a> + and <a class="link" href="monitoring-stats.html#MONITORING-PG-STAT-ALL-INDEXES-VIEW" title="28.2.19. pg_stat_all_indexes"><code class="structname">pg_stat_*_indexes</code></a>. + </p></li><li class="listitem"><p> + Record statistics on the occurrence of updated rows moving to + new pages (Corey Huinker) + </p><p> + The <code class="literal">pg_stat_*_tables</code> column is <a class="link" href="monitoring-stats.html#MONITORING-PG-STAT-ALL-TABLES-VIEW" title="28.2.18. pg_stat_all_tables"><code class="structfield">n_tup_newpage_upd</code></a>. + </p></li><li class="listitem"><p> + Add speculative lock information to the <a class="link" href="view-pg-locks.html" title="54.12. pg_locks"><code class="structname">pg_locks</code></a> + system view (Masahiko Sawada, Noriyoshi Shinoda) + </p><p> + The transaction id is displayed in the + <code class="structfield">transactionid</code> column and + the speculative insertion token is displayed in the + <code class="structfield">objid</code> column. + </p></li><li class="listitem"><p> + Add the display of prepared statement result types to the <a class="link" href="view-pg-prepared-statements.html" title="54.15. pg_prepared_statements"><code class="structname">pg_prepared_statements</code></a> + view (Dagfinn Ilmari Mannsåker) + </p></li><li class="listitem"><p> + Create subscription statistics + entries at subscription creation time so <a class="link" href="monitoring-stats.html#PG-STAT-DATABASE-VIEW" title="Table 28.26. pg_stat_database View"><code class="structfield">stats_reset</code></a> + is accurate (Andres Freund) + </p><p> + Previously entries were created only when the first statistics + were reported. + </p></li><li class="listitem"><p> + Correct the <acronym class="acronym">I/O</acronym> + accounting for temp relation writes shown in <a class="link" href="monitoring-stats.html#PG-STAT-DATABASE-VIEW" title="Table 28.26. pg_stat_database View"><code class="structname">pg_stat_database</code></a> + (Melanie Plageman) + </p></li><li class="listitem"><p> + Add function <a class="link" href="monitoring-stats.html#MONITORING-STATS-BACKEND-FUNCS-TABLE" title="Table 28.36. Per-Backend Statistics Functions"><code class="function">pg_stat_get_backend_subxact()</code></a> + to report on a session's subtransaction cache (Dilip Kumar) + </p></li><li class="listitem"><p> + Have <a class="link" href="monitoring-stats.html#MONITORING-STATS-BACKEND-FUNCS-TABLE" title="Table 28.36. Per-Backend Statistics Functions"><code class="function">pg_stat_get_backend_idset()</code></a>, + <code class="function">pg_stat_get_backend_activity()</code>, and related + functions use the unchanging backend id (Nathan Bossart) + </p><p> + Previously the index values might change during the lifetime of + the session. + </p></li><li class="listitem"><p> + Report stand-alone backends with a special backend type (Melanie + Plageman) + </p></li><li class="listitem"><p> + Add wait event <a class="link" href="monitoring-stats.html#WAIT-EVENT-TIMEOUT-TABLE" title="Table 28.13. Wait Events of Type Timeout"><code class="literal">SpinDelay</code></a> + to report spinlock sleep delays (Andres Freund) + </p></li><li class="listitem"><p> + Create new wait event <a class="link" href="monitoring-stats.html#WAIT-EVENT-IO-TABLE" title="Table 28.9. Wait Events of Type IO"><code class="literal">DSMAllocate</code></a> + to indicate waiting for dynamic shared memory allocation (Thomas + Munro) + </p><p> + Previously this type of wait was reported as + <code class="literal">DSMFillZeroWrite</code>, which was also used by + <code class="function">mmap()</code> allocations. + </p></li><li class="listitem"><p> + Add the database name to the <a class="link" href="runtime-config-logging.html#GUC-UPDATE-PROCESS-TITLE">process title</a> of logical + <acronym class="acronym">WAL</acronym> senders (Tatsuhiro Nakamori) + </p><p> + Physical <acronym class="acronym">WAL</acronym> senders do not display a database + name. + </p></li><li class="listitem"><p> + Add checkpoint and <code class="literal">REDO LSN</code> information to <a class="link" href="runtime-config-logging.html#GUC-LOG-CHECKPOINTS"><code class="varname">log_checkpoints</code></a> + messages (Bharath Rupireddy, Kyotaro Horiguchi) + </p></li><li class="listitem"><p> + Provide additional details during client certificate failures + (Jacob Champion) + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-PRIVILEGES"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.4. Privileges <a href="#RELEASE-16-PRIVILEGES" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add predefined role <a class="link" href="predefined-roles.html" title="22.5. Predefined Roles"><code class="literal">pg_create_subscription</code></a> + with permission to create subscriptions (Robert Haas) + </p></li><li class="listitem"><p> + Allow subscriptions to not require passwords (Robert Haas) + </p><p> + This is accomplished with the option <a class="link" href="sql-createsubscription.html" title="CREATE SUBSCRIPTION"><code class="literal">password_required=false</code></a>. + </p></li><li class="listitem"><p> + Simplify permissions for <a class="link" href="sql-lock.html" title="LOCK"><code class="command">LOCK + TABLE</code></a> (Jeff Davis) + </p><p> + Previously a user's ability to perform <code class="command">LOCK + TABLE</code> at various lock levels was limited to the + lock levels required by the commands they had permission + to execute on the table. For example, someone with <a class="link" href="sql-update.html" title="UPDATE"><code class="command">UPDATE</code></a> + permission could perform all lock levels except <code class="literal">ACCESS + SHARE</code>, even though it was a lesser lock level. Now users + can issue lesser lock levels if they already have permission for + greater lock levels. + </p></li><li class="listitem"><p> + Allow <a class="link" href="sql-altergroup.html" title="ALTER GROUP"><code class="literal">ALTER GROUP group_name + ADD USER user_name</code></a> to be performed with <code class="literal">ADMIN + OPTION</code> (Robert Haas) + </p><p> + Previously <code class="literal">CREATEROLE</code> permission was required. + </p></li><li class="listitem"><p> + Allow <a class="link" href="sql-grant.html" title="GRANT"><code class="command">GRANT</code></a> + to use <code class="literal">WITH ADMIN TRUE</code>/<code class="literal">FALSE</code> + syntax (Robert Haas) + </p><p> + Previously only the <code class="literal">WITH ADMIN OPTION</code> syntax + was supported. + </p></li><li class="listitem"><p> + Allow roles that create other roles to automatically + inherit the new role's rights or the ability to <a class="link" href="sql-set-role.html" title="SET ROLE"><code class="command">SET ROLE</code></a> to the + new role (Robert Haas, Shi Yu) + </p><p> + This is controlled by server variable <a class="link" href="runtime-config-client.html#GUC-CREATEROLE-SELF-GRANT"><code class="varname">createrole_self_grant</code></a>. + </p></li><li class="listitem"><p> + Prevent users from changing the default privileges of non-inherited + roles (Robert Haas) + </p><p> + This is now only allowed for inherited roles. + </p></li><li class="listitem"><p> + When granting role membership, require the granted-by role to be + a role that has appropriate permissions (Robert Haas) + </p><p> + This is a requirement even when a non-bootstrap superuser is + granting role membership. + </p></li><li class="listitem"><p> + Allow non-superusers to grant permissions using a granted-by user + that is not the current user (Robert Haas) + </p><p> + The current user still must have sufficient permissions given by + the specified granted-by user. + </p></li><li class="listitem"><p> + Add <a class="link" href="sql-grant.html" title="GRANT"><code class="command">GRANT</code></a> to + control permission to use <a class="link" href="sql-set-role.html" title="SET ROLE"><code class="command">SET + ROLE</code></a> (Robert Haas) + </p><p> + This is controlled by a new <code class="literal">GRANT ... SET</code> + option. + </p></li><li class="listitem"><p> + Add dependency tracking to roles which have granted privileges + (Robert Haas) + </p><p> + For example, removing <code class="literal">ADMIN OPTION</code> will fail if + there are privileges using that option; <code class="literal">CASCADE</code> + must be used to revoke dependent permissions. + </p></li><li class="listitem"><p> + Add dependency tracking of grantors for <a class="link" href="sql-grant.html" title="GRANT"><code class="command">GRANT</code></a> records + (Robert Haas) + </p><p> + This guarantees that <a class="link" href="catalog-pg-auth-members.html" title="53.9. pg_auth_members"><code class="structname">pg_auth_members</code></a>.<code class="structfield">grantor</code> + values are always valid. + </p></li><li class="listitem"><p> + Allow multiple role membership records (Robert Haas) + </p><p> + Previously a new membership grant would remove a previous matching + membership grant, even if other aspects of the grant did not match. + </p></li><li class="listitem"><p> + Prevent removal of superuser privileges for the bootstrap user + (Robert Haas) + </p><p> + Restoring such users could lead to errors. + </p></li><li class="listitem"><p> + Allow <a class="link" href="functions-info.html#FUNCTIONS-ACLITEM-FN-TABLE" title="Table 9.70. aclitem Functions"><code class="function">makeaclitem()</code></a> + to accept multiple privilege names (Robins Tharakan) + </p><p> + Previously only a single privilege name, like <a class="link" href="sql-select.html" title="SELECT"><code class="command">SELECT</code></a>, was + accepted. + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-SERVER-CONFIG"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.5. Server Configuration <a href="#RELEASE-16-SERVER-CONFIG" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add support for <span class="productname">Kerberos</span> credential + delegation (Stephen Frost) + </p><p> + This is enabled with server variable <a class="link" href="runtime-config-connection.html#GUC-GSS-ACCEPT-DELEGATION"><code class="varname">gss_accept_delegation</code></a> + and <span class="application">libpq</span> connection parameter <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-GSSDELEGATION"><code class="literal">gssdelegation</code></a>. + </p></li><li class="listitem"><p> + Allow the <acronym class="acronym">SCRAM</acronym> iteration + count to be set with server variable <a class="link" href="runtime-config-connection.html#GUC-SCRAM-ITERATIONS"><code class="varname">scram_iterations</code></a> + (Daniel Gustafsson) + </p></li><li class="listitem"><p> + Improve performance of server variable management (Tom Lane) + </p></li><li class="listitem"><p> + Tighten restrictions on which server variables can be reset + (Masahiko Sawada) + </p><p> + Previously, while certain variables, like <a class="link" href="runtime-config-client.html#GUC-DEFAULT-TRANSACTION-ISOLATION"><code class="varname">transaction_isolation</code></a>, + were not affected by <a class="link" href="sql-reset.html" title="RESET"><code class="command">RESET + ALL</code></a>, they could be individually reset in + inappropriate situations. + </p></li><li class="listitem"><p> + Move various <a class="link" href="config-setting.html#CONFIG-SETTING-CONFIGURATION-FILE" title="20.1.2. Parameter Interaction via the Configuration File"><code class="filename">postgresql.conf</code></a> + items into new categories (Shinya Kato) + </p><p> + This also affects the categories displayed in the <a class="link" href="view-pg-settings.html" title="54.24. pg_settings"><code class="structname">pg_settings</code></a> + view. + </p></li><li class="listitem"><p> + Prevent configuration file recursion beyond 10 levels (Julien + Rouhaud) + </p></li><li class="listitem"><p> + Allow <a class="link" href="routine-vacuuming.html#AUTOVACUUM" title="25.1.6. The Autovacuum Daemon">autovacuum</a> to more + frequently honor changes to delay settings (Melanie Plageman) + </p><p> + Rather than honor changes only at the start of each relation, + honor them at the start of each block. + </p></li><li class="listitem"><p> + Remove restrictions that archive files be durably renamed + (Nathan Bossart) + </p><p> + The <a class="link" href="runtime-config-wal.html#GUC-ARCHIVE-COMMAND"><code class="varname">archive_command</code></a> + command is now more likely to be called with already-archived + files after a crash. + </p></li><li class="listitem"><p> + Prevent <a class="link" href="runtime-config-wal.html#GUC-ARCHIVE-LIBRARY"><code class="varname">archive_library</code></a> + and <a class="link" href="runtime-config-wal.html#GUC-ARCHIVE-COMMAND"><code class="varname">archive_command</code></a> + from being set at the same time (Nathan Bossart) + </p><p> + Previously <code class="varname">archive_library</code> would override + <code class="varname">archive_command</code>. + </p></li><li class="listitem"><p> + Allow the postmaster to terminate children with an abort signal + (Tom Lane) + </p><p> + This allows collection of a core dump for a + stuck child process. This is controlled by <a class="link" href="runtime-config-developer.html#GUC-SEND-ABORT-FOR-CRASH"><code class="varname">send_abort_for_crash</code></a> + and <a class="link" href="runtime-config-developer.html#GUC-SEND-ABORT-FOR-KILL"><code class="varname">send_abort_for_kill</code></a>. + The postmaster's <code class="option">-T</code> switch is now the same as + setting <code class="varname">send_abort_for_crash</code>. + </p></li><li class="listitem"><p> + Remove the non-functional postmaster <code class="option">-n</code> option + (Tom Lane) + </p></li><li class="listitem"><p> + Allow the server to reserve backend slots for roles with <a class="link" href="predefined-roles.html" title="22.5. Predefined Roles"><code class="literal">pg_use_reserved_connections</code></a> + membership (Nathan Bossart) + </p><p> + The number of reserved slots is set by server variable <a class="link" href="runtime-config-connection.html#GUC-RESERVED-CONNECTIONS"><code class="varname">reserved_connections</code></a>. + </p></li><li class="listitem"><p> + Allow <a class="link" href="runtime-config-resource.html#GUC-HUGE-PAGES">huge pages</a> to + work on newer versions of <span class="systemitem">Windows + 10</span> (Thomas Munro) + </p><p> + This adds the special handling required to enable huge pages + on newer versions of <span class="systemitem">Windows + 10</span>. + </p></li><li class="listitem"><p> + Add <a class="link" href="runtime-config-developer.html#GUC-DEBUG-IO-DIRECT"><code class="varname">debug_io_direct</code></a> + setting for developer usage (Thomas Munro, Andres Freund, + Bharath Rupireddy) + </p><p> + While primarily for developers, <a class="link" href="runtime-config-wal.html#GUC-WAL-SYNC-METHOD"><code class="literal">wal_sync_method=open_sync</code></a>/<code class="literal">open_datasync</code> + has been modified to not use direct <acronym class="acronym">I/O</acronym> with + <code class="literal">wal_level=minimal</code>; this is now enabled with + <code class="literal">debug_io_direct=wal</code>. + </p></li><li class="listitem"><p> + Add function <a class="link" href="functions-admin.html#FUNCTIONS-ADMIN-BACKUP-TABLE" title="Table 9.91. Backup Control Functions"><code class="function">pg_split_walfile_name()</code></a> + to report the segment and timeline values of <acronym class="acronym">WAL</acronym> + file names (Bharath Rupireddy) + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-PG-HBA"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.6. <a class="link" href="auth-pg-hba-conf.html" title="21.1. The pg_hba.conf File">pg_hba.conf</a> <a href="#RELEASE-16-PG-HBA" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add support for regular expression matching on database and role + entries in <code class="filename">pg_hba.conf</code> (Bertrand Drouvot) + </p><p> + Regular expression patterns are prefixed with a slash. Database + and role names that begin with slashes need to be double-quoted + if referenced in <code class="filename">pg_hba.conf</code>. + </p></li><li class="listitem"><p> + Improve user-column handling of <a class="link" href="runtime-config-file-locations.html" title="20.2. File Locations"><code class="filename">pg_ident.conf</code></a> + to match <code class="filename">pg_hba.conf</code> (Jelte Fennema) + </p><p> + Specifically, add support for <code class="literal">all</code>, role + membership with <code class="literal">+</code>, and regular expressions + with a leading slash. Any user name that matches these patterns + must be double-quoted. + </p></li><li class="listitem"><p> + Allow include files in <code class="filename">pg_hba.conf</code> and + <code class="filename">pg_ident.conf</code> (Julien Rouhaud) + </p><p> + These are controlled by <code class="literal">include</code>, + <code class="literal">include_if_exists</code>, and + <code class="literal">include_dir</code>. System views <a class="link" href="view-pg-hba-file-rules.html" title="54.9. pg_hba_file_rules"><code class="structname">pg_hba_file_rules</code></a> + and <a class="link" href="view-pg-ident-file-mappings.html" title="54.10. pg_ident_file_mappings"><code class="structname">pg_ident_file_mappings</code></a> + now display the file name. + </p></li><li class="listitem"><p> + Allow <code class="filename">pg_hba.conf</code> tokens to be of unlimited + length (Tom Lane) + </p></li><li class="listitem"><p> + Add rule and map numbers to the system view <a class="link" href="view-pg-hba-file-rules.html" title="54.9. pg_hba_file_rules"><code class="structname">pg_hba_file_rules</code></a> + (Julien Rouhaud) + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-LOCALIZATION"><div class="titlepage"><div><div><h5 class="title">E.3.3.1.7. <a class="link" href="charset.html" title="Chapter 24. Localization">Localization</a> <a href="#RELEASE-16-LOCALIZATION" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Determine the default encoding from the locale when using + <acronym class="acronym">ICU</acronym> (Jeff Davis) + </p><p> + Previously the default was always <code class="literal">UTF-8</code>. + </p></li><li class="listitem"><p> + Have <a class="link" href="sql-createdatabase.html" title="CREATE DATABASE"><code class="command">CREATE + DATABASE</code></a> and <a class="link" href="sql-createcollation.html" title="CREATE COLLATION"><code class="command">CREATE + COLLATION</code></a>'s <code class="literal">LOCALE</code> options, and + <a class="link" href="app-initdb.html" title="initdb"><span class="application">initdb</span></a> + and <a class="link" href="app-createdb.html" title="createdb"><span class="application">createdb</span></a> + <code class="option">--locale</code> options, control + non-<span class="application">libc</span> collation providers (Jeff + Davis) + </p><p> + Previously they only controlled <span class="application">libc</span> + providers. + </p></li><li class="listitem"><p> + Add predefined collations <code class="literal">unicode</code> and + <code class="literal">ucs_basic</code> (Peter Eisentraut) + </p><p> + This only works if <acronym class="acronym">ICU</acronym> support is enabled. + </p></li><li class="listitem"><p> + Allow custom <acronym class="acronym">ICU</acronym> collation rules to be created + (Peter Eisentraut) + </p><p> + This is done using <a class="link" href="sql-createcollation.html" title="CREATE COLLATION"><code class="command">CREATE + COLLATION</code></a>'s new <code class="literal">RULES</code> + clause, as well as new options for <a class="link" href="sql-createdatabase.html" title="CREATE DATABASE"><code class="command">CREATE + DATABASE</code></a>, <a class="link" href="app-createdb.html" title="createdb"><span class="application">createdb</span></a>, + and <a class="link" href="app-initdb.html" title="initdb"><span class="application">initdb</span></a>. + </p></li><li class="listitem"><p> + Allow <span class="systemitem">Windows</span> to import + system locales automatically (Juan José Santamaría Flecha) + </p><p> + Previously, only <acronym class="acronym">ICU</acronym> locales could be imported + on <span class="systemitem">Windows</span>. + </p></li></ul></div></div></div><div class="sect3" id="RELEASE-16-LOGICAL"><div class="titlepage"><div><div><h4 class="title">E.3.3.2. <a class="link" href="logical-replication.html" title="Chapter 31. Logical Replication">Logical Replication</a> <a href="#RELEASE-16-LOGICAL" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow <a class="link" href="logicaldecoding.html" title="Chapter 49. Logical Decoding">logical decoding</a> + on standbys (Bertrand Drouvot, Andres Freund, Amit Khandekar) + </p><p> + Snapshot <acronym class="acronym">WAL</acronym> records are + required for logical slot creation but cannot be + created on standbys. To avoid delays, the new function <a class="link" href="functions-admin.html#FUNCTIONS-SNAPSHOT-SYNCHRONIZATION-TABLE" title="Table 9.94. Snapshot Synchronization Functions"><code class="function">pg_log_standby_snapshot()</code></a> + allows creation of such records. + </p></li><li class="listitem"><p> + Add server variable to control how logical decoding publishers + transfer changes and how subscribers apply them (Shi Yu) + </p><p> + The variable is <a class="link" href="runtime-config-developer.html#GUC-DEBUG-LOGICAL-REPLICATION-STREAMING"><code class="varname">debug_logical_replication_streaming</code></a>. + </p></li><li class="listitem"><p> + Allow logical replication initial table synchronization to copy + rows in binary format (Melih Mutlu) + </p><p> + This is only possible for subscriptions marked as binary. + </p></li><li class="listitem"><p> + Allow parallel application of logical replication (Hou Zhijie, + Wang Wei, Amit Kapila) + </p><p> + The <a class="link" href="sql-createsubscription.html" title="CREATE SUBSCRIPTION"><code class="command">CREATE + SUBSCRIPTION</code></a> <code class="option">STREAMING</code> + option now supports <code class="literal">parallel</code> to enable + application of large transactions by parallel workers. The number + of parallel workers is controlled by the new server variable <a class="link" href="runtime-config-replication.html#GUC-MAX-PARALLEL-APPLY-WORKERS-PER-SUBSCRIPTION"><code class="varname">max_parallel_apply_workers_per_subscription</code></a>. + Wait events <a class="link" href="monitoring-stats.html#WAIT-EVENT-ACTIVITY-TABLE" title="Table 28.5. Wait Events of Type Activity"><code class="literal">LogicalParallelApplyMain</code></a>, + <code class="literal">LogicalParallelApplyStateChange</code>, and + <code class="literal">LogicalApplySendData</code> were also added. Column + <code class="structfield">leader_pid</code> was added to system view <a class="link" href="monitoring-stats.html#MONITORING-PG-STAT-SUBSCRIPTION" title="28.2.8. pg_stat_subscription"><code class="structname">pg_stat_subscription</code></a> + to track parallel activity. + </p></li><li class="listitem"><p> + Improve performance for <a class="link" href="logical-replication-architecture.html" title="31.7. Architecture">logical replication + apply</a> without a primary key (Onder Kalaci, Amit Kapila) + </p><p> + Specifically, <code class="literal">REPLICA IDENTITY FULL</code> can now + use btree indexes rather than sequentially scanning the table to + find matches. + </p></li><li class="listitem"><p> + Allow logical replication subscribers to process only changes that + have no origin (Vignesh C, Amit Kapila) + </p><p> + This can be used to avoid replication loops. This is controlled + by the new <code class="literal">CREATE SUBSCRIPTION ... ORIGIN</code> option. + </p></li><li class="listitem"><p> + Perform logical replication <a class="link" href="sql-select.html" title="SELECT"><code class="command">SELECT</code></a> and + <acronym class="acronym">DML</acronym> actions as the table owner (Robert Haas) + </p><p> + This improves security and now requires subscription + owners to be either superusers or to have <a class="link" href="sql-set-role.html" title="SET ROLE"><code class="command">SET ROLE</code></a> + permission on all roles owning tables in the replication set. + The previous behavior of performing all operations as the + subscription owner can be enabled with the subscription <a class="link" href="sql-createsubscription.html" title="CREATE SUBSCRIPTION"><code class="option">run_as_owner</code></a> + option. + </p></li><li class="listitem"><p> + Have <a class="link" href="runtime-config-replication.html#GUC-WAL-RETRIEVE-RETRY-INTERVAL"><code class="varname">wal_retrieve_retry_interval</code></a> + operate on a per-subscription basis (Nathan Bossart) + </p><p> + Previously the retry time was applied + globally. This also adds wait events <a class="link" href="monitoring-stats.html#WAIT-EVENT-LWLOCK-TABLE" title="Table 28.12. Wait Events of Type LWLock">><code class="literal">LogicalRepLauncherDSA</code></a> + and <code class="literal">LogicalRepLauncherHash</code>. + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-UTILITY"><div class="titlepage"><div><div><h4 class="title">E.3.3.3. Utility Commands <a href="#RELEASE-16-UTILITY" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add <a class="link" href="sql-explain.html" title="EXPLAIN"><code class="command">EXPLAIN</code></a> + option <code class="literal">GENERIC_PLAN</code> to display the generic plan + for a parameterized query (Laurenz Albe) + </p></li><li class="listitem"><p> + Allow a <a class="link" href="sql-copy.html" title="COPY"><code class="command">COPY FROM</code></a> + value to map to a column's <code class="literal">DEFAULT</code> (Israel + Barth Rubio) + </p></li><li class="listitem"><p> + Allow <a class="link" href="sql-copy.html" title="COPY"><code class="command">COPY</code></a> + into foreign tables to add rows in batches (Andrey Lepikhov, + Etsuro Fujita) + </p><p> + This is controlled by the <a class="link" href="postgres-fdw.html" title="F.38. postgres_fdw — access data stored in external PostgreSQL servers"><span class="application">postgres_fdw</span></a> + option <a class="link" href="postgres-fdw.html#POSTGRES-FDW-OPTIONS-COST-ESTIMATION" title="F.38.1.3. Cost Estimation Options"><code class="option">batch_size</code></a>. + </p></li><li class="listitem"><p> + Allow the <code class="literal">STORAGE</code> type to be specified by <a class="link" href="sql-createtable.html" title="CREATE TABLE"><code class="command">CREATE TABLE</code></a> + (Teodor Sigaev, Aleksander Alekseev) + </p><p> + Previously only <a class="link" href="sql-altertable.html" title="ALTER TABLE"><code class="command">ALTER + TABLE</code></a> could control this. + </p></li><li class="listitem"><p> + Allow <a class="link" href="sql-createtrigger.html" title="CREATE TRIGGER">truncate triggers</a> + on foreign tables (Yugo Nagata) + </p></li><li class="listitem"><p> + Allow <a class="link" href="sql-vacuum.html" title="VACUUM"><code class="command">VACUUM</code></a> and <a class="link" href="app-vacuumdb.html" title="vacuumdb"><span class="application">vacuumdb</span></a> + to only process <a class="link" href="storage-toast.html" title="73.2. TOAST"><code class="literal">TOAST</code></a> tables + (Nathan Bossart) + </p><p> + This is accomplished by having <a class="link" href="sql-vacuum.html" title="VACUUM"><code class="command">VACUUM</code></a> + turn off <code class="literal">PROCESS_MAIN</code> or by <a class="link" href="app-vacuumdb.html" title="vacuumdb"><span class="application">vacuumdb</span></a> + using the <code class="option">--no-process-main</code> option. + </p></li><li class="listitem"><p> + Add <a class="link" href="sql-vacuum.html" title="VACUUM"><code class="command">VACUUM</code></a> + options to skip or update all <a class="link" href="routine-vacuuming.html#VACUUM-FOR-WRAPAROUND" title="25.1.5. Preventing Transaction ID Wraparound Failures">frozen</a> statistics (Tom Lane, + Nathan Bossart) + </p><p> + The options are <code class="literal">SKIP_DATABASE_STATS</code> and + <code class="literal">ONLY_DATABASE_STATS</code>. + </p></li><li class="listitem"><p> + Change <a class="link" href="sql-reindex.html" title="REINDEX"><code class="command">REINDEX + DATABASE</code></a> and <a class="link" href="sql-reindex.html" title="REINDEX"><code class="command">REINDEX SYSTEM</code></a> + to no longer require an argument (Simon Riggs) + </p><p> + Previously the database name had to be specified. + </p></li><li class="listitem"><p> + Allow <a class="link" href="sql-createstatistics.html" title="CREATE STATISTICS"><code class="command">CREATE + STATISTICS</code></a> to generate a statistics name if none + is specified (Simon Riggs) + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-DATATYPES"><div class="titlepage"><div><div><h4 class="title">E.3.3.4. Data Types <a href="#RELEASE-16-DATATYPES" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow non-decimal <a class="link" href="sql-syntax-lexical.html#SQL-SYNTAX-BIT-STRINGS" title="4.1.2.5. Bit-String Constants">integer + literals</a> (Peter Eisentraut) + </p><p> + For example, <code class="literal">0x42F</code>, <code class="literal">0o273</code>, + and <code class="literal">0b100101</code>. + </p></li><li class="listitem"><p> + Allow <a class="link" href="datatype-numeric.html" title="8.1. Numeric Types"><code class="type">NUMERIC</code></a> + to process hexadecimal, octal, and binary integers of any size + (Dean Rasheed) + </p><p> + Previously only unquoted eight-byte integers were supported with + these non-decimal bases. + </p></li><li class="listitem"><p> + Allow underscores in integer and numeric <a class="link" href="sql-syntax-lexical.html#SQL-SYNTAX-BIT-STRINGS" title="4.1.2.5. Bit-String Constants">constants</a> (Peter Eisentraut, + Dean Rasheed) + </p><p> + This can improve readability for long strings of digits. + </p></li><li class="listitem"><p> + Accept the spelling <code class="literal">+infinity</code> in datetime input + (Vik Fearing) + </p></li><li class="listitem"><p> + Prevent the specification of <code class="literal">epoch</code> and + <code class="literal">infinity</code> together with other fields in datetime + strings (Joseph Koshakow) + </p></li><li class="listitem"><p> + Remove undocumented support for date input in the form + <code class="literal">Y<em class="replaceable"><code>year</code></em>M<em class="replaceable"><code>month</code></em>D<em class="replaceable"><code>day</code></em></code> + (Joseph Koshakow) + </p></li><li class="listitem"><p> + Add functions <a class="link" href="functions-info.html#FUNCTIONS-INFO-VALIDITY-TABLE" title="Table 9.79. Data Validity Checking Functions"><code class="function">pg_input_is_valid()</code></a> + and <code class="function">pg_input_error_info()</code> to check for type + conversion errors (Tom Lane) + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-GENERAL"><div class="titlepage"><div><div><h4 class="title">E.3.3.5. General Queries <a href="#RELEASE-16-GENERAL" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow subqueries in the <code class="literal">FROM</code> clause to omit + aliases (Dean Rasheed) + </p></li><li class="listitem"><p> + Add support for enhanced numeric literals in + <acronym class="acronym">SQL/JSON</acronym> paths (Peter Eisentraut) + </p><p> + For example, allow hexadecimal, octal, and binary integers and + underscores between digits. + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-FUNCTIONS"><div class="titlepage"><div><div><h4 class="title">E.3.3.6. Functions <a href="#RELEASE-16-FUNCTIONS" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add <acronym class="acronym">SQL/JSON</acronym> constructors (Nikita Glukhov, + Teodor Sigaev, Oleg Bartunov, Alexander Korotkov, Amit Langote) + </p><p> + The new functions <a class="link" href="functions-json.html#FUNCTIONS-JSON-CREATION-TABLE" title="Table 9.47. JSON Creation Functions"><code class="function">JSON_ARRAY()</code></a>, + <a class="link" href="functions-aggregate.html#FUNCTIONS-AGGREGATE-TABLE" title="Table 9.59. General-Purpose Aggregate Functions"><code class="function">JSON_ARRAYAGG()</code></a>, + <code class="function">JSON_OBJECT()</code>, and + <code class="function">JSON_OBJECTAGG()</code> are part of the + <acronym class="acronym">SQL</acronym> standard. + </p></li><li class="listitem"><p> + Add <acronym class="acronym">SQL/JSON</acronym> object checks (Nikita Glukhov, + Teodor Sigaev, Oleg Bartunov, Alexander Korotkov, Amit Langote, + Andrew Dunstan) + </p><p> + The <a class="link" href="functions-json.html#FUNCTIONS-SQLJSON-MISC" title="Table 9.48. SQL/JSON Testing Functions"><code class="literal">IS + JSON</code></a> checks include checks for values, arrays, + objects, scalars, and unique keys. + </p></li><li class="listitem"><p> + Allow <acronym class="acronym">JSON</acronym> string parsing to use vector + operations (John Naylor) + </p></li><li class="listitem"><p> + Improve the handling of full text highlighting function <a class="link" href="functions-textsearch.html#TEXTSEARCH-FUNCTIONS-TABLE" title="Table 9.43. Text Search Functions"><code class="function">ts_headline()</code></a> + for <code class="literal">OR</code> and <code class="literal">NOT</code> expressions + (Tom Lane) + </p></li><li class="listitem"><p> + Add functions to add, subtract, and generate + <code class="type">timestamptz</code> values in a specified time zone (Przemyslaw + Sztoch, Gurjeet Singh) + </p><p> + The functions are <a class="link" href="functions-datetime.html#FUNCTIONS-DATETIME-TABLE" title="Table 9.33. Date/Time Functions"><code class="function">date_add()</code></a>, + <code class="function">date_subtract()</code>, and <a class="link" href="functions-srf.html#FUNCTIONS-SRF-SERIES" title="Table 9.65. Series Generating Functions"><code class="function">generate_series()</code></a>. + </p></li><li class="listitem"><p> + Change <a class="link" href="functions-datetime.html#FUNCTIONS-DATETIME-TABLE" title="Table 9.33. Date/Time Functions"><code class="function">date_trunc(unit, + timestamptz, time_zone)</code></a> to be an immutable + function (Przemyslaw Sztoch) + </p><p> + This allows the creation of expression indexes using this function. + </p></li><li class="listitem"><p> + Add server variable <a class="link" href="functions-info.html#FUNCTIONS-INFO-SESSION-TABLE" title="Table 9.67. Session Information Functions"><code class="literal">SYSTEM_USER</code></a> + (Bertrand Drouvot) + </p><p> + This reports the authentication method and its authenticated user. + </p></li><li class="listitem"><p> + Add functions <a class="link" href="functions-array.html#ARRAY-FUNCTIONS-TABLE" title="Table 9.54. Array Functions"><code class="function">array_sample()</code></a> + and <code class="function">array_shuffle()</code> (Martin Kalcher) + </p></li><li class="listitem"><p> + Add aggregate function <a class="link" href="functions-aggregate.html#FUNCTIONS-AGGREGATE-TABLE" title="Table 9.59. General-Purpose Aggregate Functions"><code class="function">ANY_VALUE()</code></a> + which returns any value from a set (Vik Fearing) + </p></li><li class="listitem"><p> + Add function <a class="link" href="functions-math.html#FUNCTIONS-MATH-RANDOM-TABLE" title="Table 9.6. Random Functions"><code class="function">random_normal()</code></a> + to supply normally-distributed random numbers (Paul Ramsey) + </p></li><li class="listitem"><p> + Add error function <a class="link" href="functions-math.html#FUNCTIONS-MATH-FUNC-TABLE" title="Table 9.5. Mathematical Functions"><code class="function">erf()</code></a> + and its complement <code class="function">erfc()</code> (Dean Rasheed) + </p></li><li class="listitem"><p> + Improve the accuracy of numeric <a class="link" href="functions-math.html#FUNCTIONS-MATH-FUNC-TABLE" title="Table 9.5. Mathematical Functions"><code class="function">power()</code></a> + for integer exponents (Dean Rasheed) + </p></li><li class="listitem"><p> + Add <a class="link" href="datatype-xml.html#DATATYPE-XML-CREATING" title="8.13.1. Creating XML Values"><code class="function">XMLSERIALIZE()</code></a> + option <code class="literal">INDENT</code> to pretty-print its output + (Jim Jones) + </p></li><li class="listitem"><p> + Change <a class="link" href="functions-admin.html#FUNCTIONS-ADMIN-COLLATION" title="Table 9.98. Collation Management Functions"><code class="function">pg_collation_actual_version()</code></a> + to return a reasonable value for the default collation (Jeff Davis) + </p><p> + Previously it returned <code class="literal">NULL</code>. + </p></li><li class="listitem"><p> + Allow <a class="link" href="functions-admin.html#FUNCTIONS-ADMIN-GENFILE-TABLE" title="Table 9.101. Generic File Access Functions"><code class="function">pg_read_file()</code></a> + and <code class="function">pg_read_binary_file()</code> to ignore missing + files (Kyotaro Horiguchi) + </p></li><li class="listitem"><p> + Add byte specification (<code class="literal">B</code>) to <a class="link" href="functions-admin.html#FUNCTIONS-ADMIN-DBSIZE" title="Table 9.96. Database Object Size Functions"><code class="function">pg_size_bytes()</code></a> + (Peter Eisentraut) + </p></li><li class="listitem"><p> + Allow <a class="link" href="functions-info.html#FUNCTIONS-INFO-CATALOG-TABLE" title="Table 9.72. System Catalog Information Functions"><code class="function">to_reg</code></a>* + functions to accept numeric <acronym class="acronym">OID</acronym>s as input + (Tom Lane) + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-PLPGSQL"><div class="titlepage"><div><div><h4 class="title">E.3.3.7. <a class="link" href="plpgsql.html" title="Chapter 43. PL/pgSQL — SQL Procedural Language">PL/pgSQL</a> <a href="#RELEASE-16-PLPGSQL" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add the ability to get the current function's <acronym class="acronym">OID</acronym> + in <span class="application">PL/pgSQL</span> (Pavel Stehule) + </p><p> + This is accomplished with <a class="link" href="plpgsql-statements.html#PLPGSQL-STATEMENTS-DIAGNOSTICS" title="43.5.5. Obtaining the Result Status"><code class="command">GET DIAGNOSTICS + variable = PG_ROUTINE_OID</code></a>. + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-LIBPQ"><div class="titlepage"><div><div><h4 class="title">E.3.3.8. <a class="link" href="libpq.html" title="Chapter 34. libpq — C Library">libpq</a> <a href="#RELEASE-16-LIBPQ" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add <span class="application">libpq</span> connection option <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-REQUIRE-AUTH"><code class="option">require_auth</code></a> + to specify a list of acceptable authentication methods (Jacob + Champion) + </p><p> + This can also be used to disallow certain authentication methods. + </p></li><li class="listitem"><p> + Allow multiple <span class="application">libpq</span>-specified hosts + to be randomly selected (Jelte Fennema) + </p><p> + This is enabled with <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-LOAD-BALANCE-HOSTS"><code class="literal">load_balance_hosts=random</code></a> + and can be used for load balancing. + </p></li><li class="listitem"><p> + Add <span class="application">libpq</span> option <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-SSLCERTMODE"><code class="option">sslcertmode</code></a> + to control transmission of the client certificate (Jacob Champion) + </p><p> + The option values are <code class="literal">disable</code>, + <code class="literal">allow</code>, and <code class="literal">require</code>. + </p></li><li class="listitem"><p> + Allow <span class="application">libpq</span> to use the system certificate + pool for certificate verification (Jacob Champion, Thomas Habets) + </p><p> + This is enabled with <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-SSLROOTCERT"><code class="literal">sslrootcert=system</code></a>, + which also enables <a class="link" href="libpq-connect.html#LIBPQ-CONNECT-SSLMODE"><code class="literal">sslmode=verify-full</code></a>. + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-CLIENT-APPS"><div class="titlepage"><div><div><h4 class="title">E.3.3.9. Client Applications <a href="#RELEASE-16-CLIENT-APPS" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow <a class="link" href="ecpg.html" title="Chapter 36. ECPG — Embedded SQL in C"><code class="command">ECPG</code></a> + variable declarations to use typedef names that match unreserved + <acronym class="acronym">SQL</acronym> keywords (Tom Lane) + </p><p> + This change does prevent keywords which match C typedef names from + being processed as keywords in later <code class="command">EXEC SQL</code> + blocks. + </p></li></ul></div><div class="sect4" id="RELEASE-16-PSQL"><div class="titlepage"><div><div><h5 class="title">E.3.3.9.1. <a class="xref" href="app-psql.html" title="psql"><span class="refentrytitle"><span class="application">psql</span></span></a> <a href="#RELEASE-16-PSQL" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow <span class="application">psql</span> to control the maximum + width of header lines in expanded format (Platon Pronko) + </p><p> + This is controlled by <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-PSET-XHEADER-WIDTH"><code class="option">xheader_width</code></a>. + </p></li><li class="listitem"><p> + Add <span class="application">psql</span> command <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-DRG"><code class="command">\drg</code></a> + to show role membership details (Pavel Luzanov) + </p><p> + The <code class="literal">Member of</code> output column has been removed + from <code class="command">\du</code> and <code class="command">\dg</code> because + this new command displays this information in more detail. + </p></li><li class="listitem"><p> + Allow <span class="application">psql</span>'s access privilege commands + to show system objects (Nathan Bossart) + </p><p> + The options are <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-DP-LC"><code class="command">\dpS</code></a> + and <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-Z"><code class="command">\zS</code></a>. + </p></li><li class="listitem"><p> + Add <code class="literal">FOREIGN</code> designation + to <span class="application">psql</span> <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-D"><code class="command">\d+</code></a> + for foreign table children and partitions (Ian Lawrence Barwick) + </p></li><li class="listitem"><p> + Prevent <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-DF-UC"><code class="command">\df+</code></a> + from showing function source code (Isaac Morland) + </p><p> + Function bodies are more easily viewed with <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-SF"><code class="command">\sf</code></a>. + </p></li><li class="listitem"><p> + Allow <span class="application">psql</span> to submit queries using + the extended query protocol (Peter Eisentraut) + </p><p> + Passing arguments to such queries is done + using the new <span class="application">psql</span> <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-BIND"><code class="command">\bind</code></a> + command. + </p></li><li class="listitem"><p> + Allow <span class="application">psql</span> <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-WATCH"><code class="command">\watch</code></a> + to limit the number of executions (Andrey Borodin) + </p><p> + The <code class="command">\watch</code> options can now be named when + specified. + </p></li><li class="listitem"><p> + Detect invalid values for <span class="application">psql</span> <a class="link" href="app-psql.html#APP-PSQL-META-COMMAND-WATCH"><code class="command">\watch</code></a>, + and allow zero to specify no delay (Andrey Borodin) + </p></li><li class="listitem"><p> + Allow <span class="application">psql</span> scripts to obtain the exit + status of shell commands and queries + (Corey Huinker, Tom Lane) + </p><p> + The new <span class="application">psql</span> control variables are <a class="link" href="app-psql.html#APP-PSQL-VARIABLES-SHELL-ERROR"><code class="literal">SHELL_ERROR</code></a> + and <a class="link" href="app-psql.html#APP-PSQL-VARIABLES-SHELL-EXIT-CODE"><code class="literal">SHELL_EXIT_CODE</code></a>. + </p></li><li class="listitem"><p> + Various <span class="application">psql</span> tab completion improvements + (Vignesh C, Aleksander Alekseev, Dagfinn Ilmari Mannsåker, + Shi Yu, Michael Paquier, Ken Kato, Peter Smith) + </p></li></ul></div></div><div class="sect4" id="RELEASE-16-PGDUMP"><div class="titlepage"><div><div><h5 class="title">E.3.3.9.2. <a class="link" href="app-pgdump.html" title="pg_dump"><span class="application">pg_dump</span></a> <a href="#RELEASE-16-PGDUMP" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add <span class="application">pg_dump</span> control of dumping child + tables and partitions (Gilles Darold) + </p><p> + The new options are <code class="option">--table-and-children</code>, + <code class="option">--exclude-table-and-children</code>, and + <code class="option">--exclude-table-data-and-children</code>. + </p></li><li class="listitem"><p> + Add <span class="application">LZ4</span> and + <span class="application">Zstandard</span> compression to + <span class="application">pg_dump</span> (Georgios Kokolatos, Justin + Pryzby) + </p></li><li class="listitem"><p> + Allow <span class="application">pg_dump</span> and <a class="link" href="app-pgbasebackup.html" title="pg_basebackup"><span class="application">pg_basebackup</span></a> + to use <code class="literal">long</code> mode for compression (Justin Pryzby) + </p></li><li class="listitem"><p> + Improve <span class="application">pg_dump</span> to accept a more + consistent compression syntax (Georgios Kokolatos) + </p><p> + Options like <code class="option">--compress=gzip:5</code>. + </p></li></ul></div></div></div><div class="sect3" id="RELEASE-16-SERVER-APPS"><div class="titlepage"><div><div><h4 class="title">E.3.3.10. Server Applications <a href="#RELEASE-16-SERVER-APPS" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Add <a class="link" href="app-initdb.html" title="initdb"><span class="application">initdb</span></a> + option to set server variables for the duration of + <span class="application">initdb</span> and all future server starts + (Tom Lane) + </p><p> + The option is <code class="option">-c name=value</code>. + </p></li><li class="listitem"><p> + Add options to <a class="link" href="app-createuser.html" title="createuser"><span class="application">createuser</span></a> + to control more user options (Shinya Kato) + </p><p> + Specifically, the new options control the valid-until date, + bypassing of row-level security, and role membership. + </p></li><li class="listitem"><p> + Deprecate <a class="link" href="app-createuser.html" title="createuser"><span class="application">createuser</span></a> + option <code class="option">--role</code> (Nathan Bossart) + </p><p> + This option could be easily confused with new + <span class="application">createuser</span> role membership options, + so option <code class="option">--member-of</code> has been added with the + same functionality. The <code class="option">--role</code> option can still + be used. + </p></li><li class="listitem"><p> + Allow control of <a class="link" href="app-vacuumdb.html" title="vacuumdb"><span class="application">vacuumdb</span></a> + schema processing (Gilles Darold) + </p><p> + These are controlled by options <code class="option">--schema</code> and + <code class="option">--exclude-schema</code>. + </p></li><li class="listitem"><p> + Use new <a class="link" href="sql-vacuum.html" title="VACUUM"><code class="command">VACUUM</code></a> + options to improve the performance of <a class="link" href="app-vacuumdb.html" title="vacuumdb"><span class="application">vacuumdb</span></a> + (Tom Lane, Nathan Bossart) + </p></li><li class="listitem"><p> + Have <a class="link" href="pgupgrade.html" title="pg_upgrade"><span class="application">pg_upgrade</span></a> + set the new cluster's locale and encoding (Jeff Davis) + </p><p> + This removes the requirement that the new cluster be created with + the same locale and encoding settings. + </p></li><li class="listitem"><p> + Add <a class="link" href="pgupgrade.html" title="pg_upgrade"><span class="application">pg_upgrade</span></a> + option to specify the default transfer mode (Peter Eisentraut) + </p><p> + The option is <code class="option">--copy</code>. + </p></li><li class="listitem"><p> + Improve <a class="link" href="app-pgbasebackup.html" title="pg_basebackup"><span class="application">pg_basebackup</span></a> + to accept numeric compression options (Georgios Kokolatos, + Michael Paquier) + </p><p> + Options like <code class="option">--compress=server-5</code> are now supported. + </p></li><li class="listitem"><p> + Fix <a class="link" href="app-pgbasebackup.html" title="pg_basebackup"><span class="application">pg_basebackup</span></a> + to handle tablespaces stored in the <code class="envar">PGDATA</code> directory + (Robert Haas) + </p></li><li class="listitem"><p> + Add <a class="link" href="pgwaldump.html" title="pg_waldump"><span class="application">pg_waldump</span></a> + option <code class="option">--save-fullpage</code> to dump full page images + (David Christensen) + </p></li><li class="listitem"><p> + Allow <a class="link" href="pgwaldump.html" title="pg_waldump"><span class="application">pg_waldump</span></a> + options <code class="option">-t</code>/<code class="option">--timeline</code> to accept + hexadecimal values (Peter Eisentraut) + </p></li><li class="listitem"><p> + Add support for progress reporting to <a class="link" href="app-pgverifybackup.html" title="pg_verifybackup"><span class="application">pg_verifybackup</span></a> + (Masahiko Sawada) + </p></li><li class="listitem"><p> + Allow <a class="link" href="app-pgrewind.html" title="pg_rewind"><span class="application">pg_rewind</span></a> + to properly track timeline changes (Heikki Linnakangas) + </p><p> + Previously if <span class="application">pg_rewind</span> was run after + a timeline switch but before a checkpoint was issued, it might + incorrectly determine that a rewind was unnecessary. + </p></li><li class="listitem"><p> + Have <a class="link" href="app-pgreceivewal.html" title="pg_receivewal"><span class="application">pg_receivewal</span></a> + and <a class="link" href="app-pgrecvlogical.html" title="pg_recvlogical"><span class="application">pg_recvlogical</span></a> + cleanly exit on <code class="literal">SIGTERM</code> (Christoph Berg) + </p><p> + This signal is often used by <span class="application">systemd</span>. + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-SOURCE-CODE"><div class="titlepage"><div><div><h4 class="title">E.3.3.11. Source Code <a href="#RELEASE-16-SOURCE-CODE" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Build <acronym class="acronym">ICU</acronym> support by default (Jeff Davis) + </p><p> + This removes <a class="link" href="installation.html" title="Chapter 17. Installation from Source Code">build + flag</a> <code class="option">--with-icu</code> and adds flag + <code class="option">--without-icu</code>. + </p></li><li class="listitem"><p> + Add support for SSE2 (Streaming <acronym class="acronym">SIMD</acronym> Extensions + 2) vector operations on x86-64 architectures (John Naylor) + </p></li><li class="listitem"><p> + Add support for Advanced <acronym class="acronym">SIMD</acronym> (Single + Instruction Multiple Data) (<acronym class="acronym">NEON</acronym>) instructions + on <acronym class="acronym">ARM</acronym> architectures (Nathan Bossart) + </p></li><li class="listitem"><p> + Have <span class="systemitem">Windows</span> + binaries built with <span class="productname">MSVC</span> use + <code class="literal">RandomizedBaseAddress</code> (<acronym class="acronym">ASLR</acronym>) + (Michael Paquier) + </p><p> + This was already enabled on <span class="productname">MinGW</span> builds. + </p></li><li class="listitem"><p> + Prevent extension libraries from exporting their symbols by default + (Andres Freund, Tom Lane) + </p><p> + Functions that need to be called from the core backend + or other extensions must now be explicitly marked + <code class="literal">PGDLLEXPORT</code>. + </p></li><li class="listitem"><p> + Require <span class="systemitem">Windows 10</span> or + newer versions (Michael Paquier, Juan José Santamaría Flecha) + </p><p> + Previously <span class="systemitem">Windows Vista</span> and + <span class="systemitem">Windows XP</span> were supported. + </p></li><li class="listitem"><p> + Require <span class="productname">Perl</span> version 5.14 or later + (John Naylor) + </p></li><li class="listitem"><p> + Require <span class="productname">Bison</span> version 2.3 or later + (John Naylor) + </p></li><li class="listitem"><p> + Require <span class="productname">Flex</span> version 2.5.35 or later + (John Naylor) + </p></li><li class="listitem"><p> + Require <acronym class="acronym">MIT</acronym> Kerberos for + <acronym class="acronym">GSSAPI</acronym> support (Stephen Frost) + </p></li><li class="listitem"><p> + Remove support for <span class="productname">Visual Studio 2013</span> + (Michael Paquier) + </p></li><li class="listitem"><p> + Remove support for <span class="systemitem">HP-UX</span> + (Thomas Munro) + </p></li><li class="listitem"><p> + Remove support for <span class="productname">HP/Intel Itanium</span> + (Thomas Munro) + </p></li><li class="listitem"><p> + Remove support for <span class="productname">M68K</span>, + <span class="productname">M88K</span>, <span class="productname">M32R</span>, + and <span class="productname">SuperH</span> <acronym class="acronym">CPU</acronym> + architectures (Thomas Munro) + </p></li><li class="listitem"><p> + Remove <a class="link" href="libpq.html" title="Chapter 34. libpq — C Library"><span class="application">libpq</span></a> + support for <acronym class="acronym">SCM</acronym> credential authentication + (Michael Paquier) + </p><p> + Backend support for this authentication method was removed in + <span class="productname">PostgresSQL</span> 9.1. + </p></li><li class="listitem"><p> + Add <a class="link" href="install-meson.html" title="17.4. Building and Installation with Meson"><span class="application">meson</span></a> + build system (Andres Freund, Nazir Bilal Yavuz, Peter Eisentraut) + </p><p> + This eventually will replace the <span class="productname">Autoconf</span> + and <span class="systemitem">Windows</span>-based + <span class="productname">MSVC</span> build systems. + </p></li><li class="listitem"><p> + Allow control of the location of the + <span class="application">openssl</span> binary used by the build system + (Peter Eisentraut) + </p><p> + Make finding <span class="application">openssl</span> + program a <span class="application">configure</span> or + <span class="application">meson</span> option + </p></li><li class="listitem"><p> + Add build option to allow testing of small table segment sizes + (Andres Freund) + </p><p> + The build options are <a class="link" href="install-make.html#CONFIGURE-OPTION-WITH-SEGSIZE"><code class="option">--with-segsize-blocks</code></a> + and <code class="option">-Dsegsize_blocks</code>. + </p></li><li class="listitem"><p> + Add <a class="link" href="source.html" title="Chapter 56. PostgreSQL Coding Conventions"><span class="application">pgindent</span></a> options + (Andrew Dunstan) + </p><p> + The new options are <code class="option">--show-diff</code>, + <code class="option">--silent-diff</code>, <code class="option">--commit</code>, + and <code class="option">--help</code>, and allow multiple + <code class="option">--exclude</code> options. Also require the typedef file + to be explicitly specified. Options <code class="option">--code-base</code> + and <code class="option">--build</code> were also removed. + </p></li><li class="listitem"><p> + Add <a class="link" href="source.html" title="Chapter 56. PostgreSQL Coding Conventions"><span class="application">pg_bsd_indent</span></a> + source code to the main tree (Tom Lane) + </p></li><li class="listitem"><p> + Improve <span class="application">make_ctags</span> and + <span class="application">make_etags</span> (Yugo Nagata) + </p></li><li class="listitem"><p> + Adjust <a class="link" href="catalog-pg-attribute.html" title="53.7. pg_attribute"><code class="structname">pg_attribute</code></a> + columns for efficiency (Peter Eisentraut) + </p></li></ul></div></div><div class="sect3" id="RELEASE-16-MODULES"><div class="titlepage"><div><div><h4 class="title">E.3.3.12. Additional Modules <a href="#RELEASE-16-MODULES" class="id_link">#</a></h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Improve use of extension-based indexes on boolean columns (Zongliang + Quan, Tom Lane) + </p></li><li class="listitem"><p> + Add support for Daitch-Mokotoff Soundex to <a class="link" href="fuzzystrmatch.html" title="F.17. fuzzystrmatch — determine string similarities and distance"><span class="application">fuzzystrmatch</span></a> + (Dag Lem) + </p></li><li class="listitem"><p> + Allow <a class="link" href="auto-explain.html" title="F.4. auto_explain — log execution plans of slow queries"><span class="application">auto_explain</span></a> + to log values passed to parameterized statements (Dagfinn Ilmari + Mannsåker) + </p><p> + This affects queries using server-side <a class="link" href="sql-prepare.html" title="PREPARE"><code class="command">PREPARE</code></a>/<a class="link" href="sql-execute.html" title="EXECUTE"><code class="command">EXECUTE</code></a> + and client-side parse/bind. Logging is controlled by <a class="link" href="auto-explain.html#AUTO-EXPLAIN-CONFIGURATION-PARAMETERS-LOG-PARAMETER-MAX-LENGTH"><code class="literal">auto_explain.log_parameter_max_length</code></a>; + by default query parameters will be logged with no length + restriction. + </p></li><li class="listitem"><p> + Have <a class="link" href="auto-explain.html" title="F.4. auto_explain — log execution plans of slow queries"><span class="application">auto_explain</span></a>'s + <code class="option">log_verbose</code> mode honor the value of <a class="link" href="runtime-config-statistics.html#GUC-COMPUTE-QUERY-ID"><code class="varname">compute_query_id</code></a> + (Atsushi Torikoshi) + </p><p> + Previously even if + <code class="varname">compute_query_id</code> was enabled, <a class="link" href="auto-explain.html#AUTO-EXPLAIN-CONFIGURATION-PARAMETERS-LOG-VERBOSE"><code class="option">log_verbose</code></a> + was not showing the query identifier. + </p></li><li class="listitem"><p> + Change the maximum length of <a class="link" href="ltree.html" title="F.23. ltree — hierarchical tree-like data type"><span class="application">ltree</span></a> labels + from 256 to 1000 and allow hyphens (Garen Torikian) + </p></li><li class="listitem"><p> + Have <a class="link" href="pgstatstatements.html" title="F.32. pg_stat_statements — track statistics of SQL planning and execution"><code class="structname">pg_stat_statements</code></a> + normalize constants used in utility commands (Michael Paquier) + </p><p> + Previously constants appeared instead of placeholders, e.g., + <code class="literal">$1</code>. + </p></li><li class="listitem"><p> + Add <a class="link" href="pgwalinspect.html" title="F.37. pg_walinspect — low-level WAL inspection"><span class="application">pg_walinspect</span></a> + function <a class="link" href="pgwalinspect.html#PGWALINSPECT-FUNCS-PG-GET-WAL-BLOCK-INFO"><code class="function">pg_get_wal_block_info()</code></a> + to report <acronym class="acronym">WAL</acronym> block information (Michael Paquier, + Melanie Plageman, Bharath Rupireddy) + </p></li><li class="listitem"><p> + Change how <a class="link" href="pgwalinspect.html" title="F.37. pg_walinspect — low-level WAL inspection"><span class="application">pg_walinspect</span></a> + functions <a class="link" href="pgwalinspect.html#PGWALINSPECT-FUNCS-PG-GET-WAL-RECORDS-INFO"><code class="function">pg_get_wal_records_info()</code></a> + and <a class="link" href="pgwalinspect.html#PGWALINSPECT-FUNCS-PG-GET-WAL-STATS"><code class="function">pg_get_wal_stats()</code></a> + interpret ending <acronym class="acronym">LSN</acronym>s (Bharath Rupireddy) + </p><p> + Previously ending <acronym class="acronym">LSN</acronym>s which represent + nonexistent <acronym class="acronym">WAL</acronym> locations would generate + an error, while they will now be interpreted as the end of the + <acronym class="acronym">WAL</acronym>. + </p></li><li class="listitem"><p> + Add detailed descriptions of <acronym class="acronym">WAL</acronym> records in <a class="link" href="pgwalinspect.html" title="F.37. pg_walinspect — low-level WAL inspection"><span class="application">pg_walinspect</span></a> + and <a class="link" href="pgwaldump.html" title="pg_waldump"><span class="application">pg_waldump</span></a> + (Melanie Plageman, Peter Geoghegan) + </p></li><li class="listitem"><p> + Add <a class="link" href="pageinspect.html" title="F.25. pageinspect — low-level inspection of database pages"><span class="application">pageinspect</span></a> + function <a class="link" href="pageinspect.html#PAGEINSPECT-B-TREE-FUNCS" title="F.25.3. B-Tree Functions"><code class="function">bt_multi_page_stats()</code></a> + to report statistics on multiple pages (Hamid Akhtar) + </p><p> + This is similar to <code class="function">bt_page_stats()</code> except it + can report on a range of pages. + </p></li><li class="listitem"><p> + Add empty range output column to <a class="link" href="pageinspect.html" title="F.25. pageinspect — low-level inspection of database pages"><span class="application">pageinspect</span></a> + function <a class="link" href="pageinspect.html#PAGEINSPECT-BRIN-FUNCS" title="F.25.4. BRIN Functions"><code class="function">brin_page_items()</code></a> + (Tomas Vondra) + </p></li><li class="listitem"><p> + Redesign archive modules to be more flexible (Nathan Bossart) + </p><p> + Initialization changes will require modules written for older + versions of Postgres to be updated. + </p></li><li class="listitem"><p> + Correct inaccurate <a class="link" href="pgstatstatements.html" title="F.32. pg_stat_statements — track statistics of SQL planning and execution"><span class="application">pg_stat_statements</span></a> + row tracking extended query protocol statements (Sami Imseih) + </p></li><li class="listitem"><p> + Add <a class="link" href="pgbuffercache.html" title="F.27. pg_buffercache — inspect PostgreSQL buffer cache state"><span class="application">pg_buffercache</span></a> + function <code class="function">pg_buffercache_usage_counts()</code> to + report usage totals (Nathan Bossart) + </p></li><li class="listitem"><p> + Add <a class="link" href="pgbuffercache.html" title="F.27. pg_buffercache — inspect PostgreSQL buffer cache state"><span class="application">pg_buffercache</span></a> + function <code class="function">pg_buffercache_summary()</code> to report + summarized buffer statistics (Melih Mutlu) + </p></li><li class="listitem"><p> + Allow the schemas of required extensions to be + referenced in extension scripts using the new syntax + <code class="literal">@extschema:referenced_extension_name@</code> + (Regina Obe) + </p></li><li class="listitem"><p> + Allow required extensions to + be marked as non-relocatable using <a class="link" href="extend-extensions.html#EXTEND-EXTENSIONS-FILES-NO-RELOCATE"><code class="literal">no_relocate</code></a> + (Regina Obe) + </p><p> + This allows <code class="literal">@extschema:referenced_extension_name@</code> + to be treated as a constant for the lifetime of the extension. + </p></li></ul></div><div class="sect4" id="RELEASE-16-PGFDW"><div class="titlepage"><div><div><h5 class="title">E.3.3.12.1. <a class="link" href="postgres-fdw.html" title="F.38. postgres_fdw — access data stored in external PostgreSQL servers"><span class="application">postgres_fdw</span></a> <a href="#RELEASE-16-PGFDW" class="id_link">#</a></h5></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + Allow <span class="application">postgres_fdw</span> to do aborts in + parallel (Etsuro Fujita) + </p><p> + This is enabled with + <span class="application">postgres_fdw</span> option <a class="link" href="postgres-fdw.html#POSTGRES-FDW-OPTIONS-TRANSACTION-MANAGEMENT" title="F.38.1.6. Transaction Management Options"><code class="option">parallel_abort</code></a>. + </p></li><li class="listitem"><p> + Make <a class="link" href="sql-analyze.html" title="ANALYZE"><code class="command">ANALYZE</code></a> + on foreign <span class="application">postgres_fdw</span> tables more + efficient (Tomas Vondra) + </p><p> + The <span class="application">postgres_fdw</span> option <a class="link" href="postgres-fdw.html#POSTGRES-FDW-OPTIONS-COST-ESTIMATION" title="F.38.1.3. Cost Estimation Options"><code class="option">analyze_sampling</code></a> + controls the sampling method. + </p></li><li class="listitem"><p> + Restrict shipment of <a class="link" href="datatype-oid.html" title="8.19. Object Identifier Types"><code class="type">reg</code></a>* type constants + in <span class="application">postgres_fdw</span> to those referencing + built-in objects or extensions marked as shippable (Tom Lane) + </p></li><li class="listitem"><p> + Have <span class="application">postgres_fdw</span> and <a class="link" href="dblink.html" title="F.12. dblink — connect to other PostgreSQL databases"><span class="application">dblink</span></a> handle + interrupts during connection establishment (Andres Freund) + </p></li></ul></div></div></div></div><div class="sect2" id="RELEASE-16-ACKNOWLEDGEMENTS"><div class="titlepage"><div><div><h3 class="title">E.3.4. Acknowledgments <a href="#RELEASE-16-ACKNOWLEDGEMENTS" class="id_link">#</a></h3></div></div></div><p> + The following individuals (in alphabetical order) have contributed + to this release as patch authors, committers, reviewers, testers, + or reporters of issues. + </p><table border="0" summary="Simple list" class="simplelist"><tr><td>Abhijit Menon-Sen</td></tr><tr><td>Adam Mackler</td></tr><tr><td>Adrian Klaver</td></tr><tr><td>Ahsan Hadi</td></tr><tr><td>Ajin Cherian</td></tr><tr><td>Ajit Awekar</td></tr><tr><td>Alan Hodgson</td></tr><tr><td>Aleksander Alekseev</td></tr><tr><td>Alex Denman</td></tr><tr><td>Alex Kozhemyakin</td></tr><tr><td>Alexander Korolev</td></tr><tr><td>Alexander Korotkov</td></tr><tr><td>Alexander Lakhin</td></tr><tr><td>Alexander Pyhalov</td></tr><tr><td>Alexey Borzov</td></tr><tr><td>Alexey Ermakov</td></tr><tr><td>Alexey Makhmutov</td></tr><tr><td>Álvaro Herrera</td></tr><tr><td>Amit Kapila</td></tr><tr><td>Amit Khandekar</td></tr><tr><td>Amit Langote</td></tr><tr><td>Amul Sul</td></tr><tr><td>Anastasia Lubennikova</td></tr><tr><td>Anban Company</td></tr><tr><td>Andreas Dijkman</td></tr><tr><td>Andreas Karlsson</td></tr><tr><td>Andreas Scherbaum</td></tr><tr><td>Andrei Zubkov</td></tr><tr><td>Andres Freund</td></tr><tr><td>Andrew Alsup</td></tr><tr><td>Andrew Bille</td></tr><tr><td>Andrew Dunstan</td></tr><tr><td>Andrew Gierth</td></tr><tr><td>Andrew Kesper</td></tr><tr><td>Andrey Borodin</td></tr><tr><td>Andrey Lepikhov</td></tr><tr><td>Andrey Sokolov</td></tr><tr><td>Ankit Kumar Pandey</td></tr><tr><td>Ante Kresic</td></tr><tr><td>Anton Melnikov</td></tr><tr><td>Anton Sidyakin</td></tr><tr><td>Anton Voloshin</td></tr><tr><td>Antonin Houska</td></tr><tr><td>Arne Roland</td></tr><tr><td>Artem Anisimov</td></tr><tr><td>Arthur Zakirov</td></tr><tr><td>Ashutosh Bapat</td></tr><tr><td>Ashutosh Sharma</td></tr><tr><td>Asim Praveen</td></tr><tr><td>Atsushi Torikoshi</td></tr><tr><td>Ayaki Tachikake</td></tr><tr><td>Balazs Szilfai</td></tr><tr><td>Benoit Lobréau</td></tr><tr><td>Bernd Helmle</td></tr><tr><td>Bertrand Drouvot</td></tr><tr><td>Bharath Rupireddy</td></tr><tr><td>Bilva Sanaba</td></tr><tr><td>Bob Krier</td></tr><tr><td>Boris Zentner</td></tr><tr><td>Brad Nicholson</td></tr><tr><td>Brar Piening</td></tr><tr><td>Bruce Momjian</td></tr><tr><td>Bruno da Silva</td></tr><tr><td>Carl Sopchak</td></tr><tr><td>Cary Huang</td></tr><tr><td>Changhong Fei</td></tr><tr><td>Chris Travers</td></tr><tr><td>Christoph Berg</td></tr><tr><td>Christophe Pettus</td></tr><tr><td>Corey Huinker</td></tr><tr><td>Craig Ringer</td></tr><tr><td>Curt Kolovson</td></tr><tr><td>Dag Lem</td></tr><tr><td>Dagfinn Ilmari Mannsåker</td></tr><tr><td>Daniel Gustafsson</td></tr><tr><td>Daniel Vérité</td></tr><tr><td>Daniel Watzinger</td></tr><tr><td>Daniel Westermann</td></tr><tr><td>Daniele Varrazzo</td></tr><tr><td>Daniil Anisimov</td></tr><tr><td>Danny Shemesh</td></tr><tr><td>Dave Page</td></tr><tr><td>David Christensen</td></tr><tr><td>David G. Johnston</td></tr><tr><td>David Geier</td></tr><tr><td>David Gilman</td></tr><tr><td>David Kimura</td></tr><tr><td>David Rowley</td></tr><tr><td>David Steele</td></tr><tr><td>David Turon</td></tr><tr><td>David Zhang</td></tr><tr><td>Davinder Singh</td></tr><tr><td>Dean Rasheed</td></tr><tr><td>Denis Laxalde</td></tr><tr><td>Dilip Kumar</td></tr><tr><td>Dimos Stamatakis</td></tr><tr><td>Dmitriy Kuzmin</td></tr><tr><td>Dmitry Astapov</td></tr><tr><td>Dmitry Dolgov</td></tr><tr><td>Dmitry Koval</td></tr><tr><td>Dong Wook Lee</td></tr><tr><td>Dongming Liu</td></tr><tr><td>Drew DeVault</td></tr><tr><td>Duncan Sands</td></tr><tr><td>Ed Maste</td></tr><tr><td>Egor Chindyaskin</td></tr><tr><td>Ekaterina Kiryanova</td></tr><tr><td>Elena Indrupskaya</td></tr><tr><td>Emmanuel Quincerot</td></tr><tr><td>Eric Mutta</td></tr><tr><td>Erik Rijkers</td></tr><tr><td>Erki Eessaar</td></tr><tr><td>Erwin Brandstetter</td></tr><tr><td>Etsuro Fujita</td></tr><tr><td>Eugeny Zhuzhnev</td></tr><tr><td>Euler Taveira</td></tr><tr><td>Evan Jones</td></tr><tr><td>Evgeny Morozov</td></tr><tr><td>Fabrízio de Royes Mello</td></tr><tr><td>Farias de Oliveira</td></tr><tr><td>Florin Irion</td></tr><tr><td>Franz-Josef Färber</td></tr><tr><td>Garen Torikian</td></tr><tr><td>Georgios Kokolatos</td></tr><tr><td>Gilles Darold</td></tr><tr><td>Greg Stark</td></tr><tr><td>Guillaume Lelarge</td></tr><tr><td>Gunnar Bluth</td></tr><tr><td>Gunnar Morling</td></tr><tr><td>Gurjeet Singh</td></tr><tr><td>Haiyang Wang</td></tr><tr><td>Haiying Tang</td></tr><tr><td>Hamid Akhtar</td></tr><tr><td>Hans Buschmann</td></tr><tr><td>Hao Wu</td></tr><tr><td>Hayato Kuroda</td></tr><tr><td>Heath Lord</td></tr><tr><td>Heikki Linnakangas</td></tr><tr><td>Himanshu Upadhyaya</td></tr><tr><td>Hisahiro Kauchi</td></tr><tr><td>Hongyu Song</td></tr><tr><td>Hubert Lubaczewski</td></tr><tr><td>Hung Nguyen</td></tr><tr><td>Ian Barwick</td></tr><tr><td>Ibrar Ahmed</td></tr><tr><td>Ilya Gladyshev</td></tr><tr><td>Ilya Nenashev</td></tr><tr><td>Isaac Morland</td></tr><tr><td>Israel Barth Rubio</td></tr><tr><td>Jacob Champion</td></tr><tr><td>Jacob Speidel</td></tr><tr><td>Jaime Casanova</td></tr><tr><td>Jakub Wartak</td></tr><tr><td>James Coleman</td></tr><tr><td>James Inform</td></tr><tr><td>James Vanns</td></tr><tr><td>Jan Wieck</td></tr><tr><td>Japin Li</td></tr><tr><td>Jeevan Ladhe</td></tr><tr><td>Jeff Davis</td></tr><tr><td>Jeff Janes</td></tr><tr><td>Jehan-Guillaume de Rorthais</td></tr><tr><td>Jelte Fennema</td></tr><tr><td>Jian He</td></tr><tr><td>Jim Jones</td></tr><tr><td>Jinbao Chen</td></tr><tr><td>Joe Conway</td></tr><tr><td>Joel Jacobson</td></tr><tr><td>John Naylor</td></tr><tr><td>Jonathan Katz</td></tr><tr><td>Josef Simanek</td></tr><tr><td>Joseph Koshakow</td></tr><tr><td>Juan José Santamaría Flecha</td></tr><tr><td>Julien Rouhaud</td></tr><tr><td>Julien Roze</td></tr><tr><td>Junwang Zhao</td></tr><tr><td>Justin Pryzby</td></tr><tr><td>Justin Zhang</td></tr><tr><td>Karina Litskevich</td></tr><tr><td>Karl O. Pinc</td></tr><tr><td>Keisuke Kuroda</td></tr><tr><td>Ken Kato</td></tr><tr><td>Kevin McKibbin</td></tr><tr><td>Kieran McCusker</td></tr><tr><td>Kirk Wolak</td></tr><tr><td>Konstantin Knizhnik</td></tr><tr><td>Koshi Shibagaki</td></tr><tr><td>Kotaro Kawamoto</td></tr><tr><td>Kui Liu</td></tr><tr><td>Kyotaro Horiguchi</td></tr><tr><td>Lakshmi Narayanan Sreethar</td></tr><tr><td>Laurence Parry</td></tr><tr><td>Laurenz Albe</td></tr><tr><td>Luca Ferrari</td></tr><tr><td>Lukas Fittl</td></tr><tr><td>Maciek Sakrejda</td></tr><tr><td>Magnus Hagander</td></tr><tr><td>Maja Zaloznik</td></tr><tr><td>Marcel Hofstetter</td></tr><tr><td>Marina Polyakova</td></tr><tr><td>Mark Dilger</td></tr><tr><td>Marko Tiikkaja</td></tr><tr><td>Markus Winand</td></tr><tr><td>Martijn van Oosterhout</td></tr><tr><td>Martin Jurca</td></tr><tr><td>Martin Kalcher</td></tr><tr><td>Mary Xu</td></tr><tr><td>Masahiko Sawada</td></tr><tr><td>Masahiro Ikeda</td></tr><tr><td>Masao Fujii</td></tr><tr><td>Mason 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