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docs: initial draft of PG 11 release notes

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<!ENTITY sourcerepo SYSTEM "sourcerepo.sgml">
<!ENTITY release SYSTEM "release.sgml">
<!ENTITY release-11 SYSTEM "release-11.sgml">
<!ENTITY release-10 SYSTEM "release-10.sgml">
<!ENTITY release-9.6 SYSTEM "release-9.6.sgml">
<!ENTITY release-9.5 SYSTEM "release-9.5.sgml">
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doc/src/sgml/release-11.sgml 0 → 100644
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<!-- doc/src/sgml/release-11.sgml -->
<!-- See header comment in release.sgml about typical markup -->
<sect1 id="release-11">
<title>Release 11</title>
<formalpara>
<title>Release date:</title>
<para>2018-??-?? (CURRENT AS OF 2018-05-01)</para>
</formalpara>
<sect2>
<title>Overview</title>
<para>
Major enhancements in <productname>PostgreSQL</productname> 11 include:
</para>
<!-- Items in this list summarize one or more items below -->
<itemizedlist>
<listitem><para>XXX</para></listitem>
</itemizedlist>
<para>
The above items are explained in more detail in the sections below.
</para>
</sect2>
<sect2>
<title>Migration to Version 11</title>
<para>
A dump/restore using <xref linkend="app-pg-dumpall"/>, or use of <xref
linkend="pgupgrade"/>, is required for those wishing to migrate data
from any previous release.
</para>
<para>
Version 11 contains a number of changes that may affect compatibility
with previous releases. Observe the following incompatibilities:
</para>
<itemizedlist>
<listitem>
<!--
2018-01-22 [b3f840120] Move handling of database properties from pg_dumpall int
2018-01-23 [160a4f62e] In pg_dump, force reconnection after issuing ALTER DATAB
2018-01-25 [0d4e6ed30] Clean up some aspects of pg_dump/pg_restore item-selecti
-->
<para>
Have pg_dump dump all aspects of a database (Haribabu Kommi)
</para>
<para>
Previously database attributes like GRANT/REVOKE permissions and ALTER
DATABASE SET and ALTER ROLE IN DATABASE SET variable settings were only
dumped by pg_dumpall. Now pg_dump --create and pg_restore --create
will restore all database aspects. pg_dumpall -g will now only output
role and tablespace-related attributes. pg_dumpall's output (without
-g) is unchanged.
</para>
<para>
pg_dump and pg_restore, without --clean, no longer dump/restore database
comments and security labels.
</para>
<para>
pg_dumpall --clean now restores the "postgres" and "template1" databases
with the original locale and encoding settings.
</para>
<para>
A restore of pg_dumpall will now create databases with their original
locale and encoding, and will fail if the creation fails. Previously
CREATE DATABASE would be dumped without such specifications if the
database locale and encoding matched the old cluster's defaults.
</para>
<para>
DID I GET EVERYTHING?
</para>
</listitem>
<listitem>
<!--
2017-08-16 [9b5140fb5] Correct representation of foreign tables in information
-->
<para>
Correct information schema column tables.table_type to return 'FOREIGN'
instead of 'FOREIGN TABLE' (Peter Eisentraut)
</para>
<para>
This new output matches the SQL standard.
</para>
</listitem>
<listitem>
<!--
2017-09-20 [be87b70b6] Sync process names between ps and pg_stat_activity
-->
<para>
Change the ps process display labels to match the
pg_stat_activity.backend_type labels (Peter Eisentraut)
</para>
</listitem>
<listitem>
<!--
2017-11-17 [e87d4965b] Prevent to_number() from losing data when template doesn
-->
<para>
Prevent to_number() from consuming characters when the template
separator does not match (Oliver Ford)
</para>
<para>
Specifically, SELECT to_number('1234', '9,999') used to return '134'. It
will now return '1234'. "L" and "TH" now only consume characters that
are not digits, positive/negative signs, decimal points, and commas.
</para>
</listitem>
<listitem>
<!--
2017-11-18 [976a1a48f] Improve to_date/to_number/to_timestamp behavior with mul
-->
<para>
Fix to_date(), to_number(), and to_timestamp() to skip a character for
each template character (Tom Lane)
</para>
<para>
Previously _bytes_ were skipped.
</para>
</listitem>
<listitem>
<!--
2017-11-18 [63ca86318] Fix quoted-substring handling in format parsing for to_c
-->
<para>
Adjust the handling of backslashes inside double-quotes in template
strings for to_char(), to_number(), and to_timestamp().
</para>
<para>
Such a backslash now escapes the character after it, particularly
a double-quote or another backslash.
</para>
</listitem>
<listitem>
<!--
2018-03-27 [1944cdc98] libpq: PQhost to return active connected host or hostadd
-->
<para>
Have libpq's PQhost() always return the actual connected host (Hari
Babu)
</para>
<para>
Previously PQhost() often returned the supplied host parameters, which
could contain several hosts. The same is true of PQport(), which now
returns the actual port number, not the multiple supplied port numbers.
ACCURATE?
</para>
</listitem>
<listitem>
<!--
2018-03-14 [f66e8bf87] Remove pg_class.relhaspkey
-->
<para>
Remove relhaspkey column from system table pg_class (Peter Eisentraut)
</para>
<para>
Applications needing to check for a primary key should consult pg_index.
</para>
</listitem>
<listitem>
<!--
2018-03-02 [fd1a421fe] Add prokind column, replacing proisagg and proiswindow
-->
<para>
Replace system table pg_proc's proisagg and proiswindow with prokind
(Peter Eisentraut)
</para>
<para>
This new column more clearly identifies functions, procedures,
aggregates, and window functions.
</para>
</listitem>
<listitem>
<!--
2017-11-09 [ae20b23a9] Refactor permissions checks for large objects.
2017-11-14 [6d776522d] Document changes in large-object privilege checking.
-->
<para>
Cause large object permission checks to happen on large object open,
lo_open(), not read/write (Tom Lane)
</para>
</listitem>
<listitem>
<!--
2018-04-06 [11523e860] Support new default roles with adminpack
-->
<para>
Remove deprecated contrib/adminpack functions pg_file_read(),
pg_file_length(), and pg_logfile_rotate() (Stephen Frost)
</para>
<para>
These function are now present by default. Old adminpack installs will
continue to have access to these functions until they are updated via
ALTER EXTENSION ... UPDATE.
</para>
</listitem>
<listitem>
<!--
2018-01-26 [fb8697b31] Avoid unnecessary use of pg_strcasecmp for already-downc
-->
<para>
Honor the capitalization of double-quoted command options (Daniel
Gustafsson)
</para>
<para>
Previously index options names like ("FillFactor" = 50) were
automatically lower-cased. This quoted capitalization will now generate
an error.
</para>
</listitem>
<listitem>
<!--
2018-01-26 [4971d2a32] Remove the obsolete WITH clause of CREATE FUNCTION.
-->
<para>
Remove WITH clause in CREATE FUNCTION (Michael Paquier)
</para>
<para>
Postgres has long supported a more standard-compliant syntax for this
capability.
</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Changes</title>
<para>
Below you will find a detailed account of the changes between
<productname>PostgreSQL</productname> 10 and the previous major
release.
</para>
<sect3>
<title>Server</title>
<sect4>
<title>Partitioning</title>
<itemizedlist>
<listitem>
<!--
2018-02-02 [9aef17316] Refactor code for partition bound searching
2018-02-23 [f724022d0] Revise API for partition bound search functions.
2018-04-06 [9fdb675fc] Faster partition pruning
2018-04-23 [055fb8d33] Add GUC enable_partition_pruning
-->
<para>
Allow faster partition elimination during query processing (Amit Langote,
David Rowley, Dilip Kumar)
</para>
<para>
This speeds access to partitioned tables with many partitions.
</para>
</listitem>
<listitem>
<!--
2018-04-07 [499be013d] Support partition pruning at execution time
-->
<para>
Allow partition elimination during query execution (David Rowley, Beena
Emerson)
</para>
<para>
Previously partition elimination could only happen at planning time,
meaning many joins and prepared queries could not use partition
elimination.
</para>
</listitem>
<listitem>
<!--
2017-11-09 [1aba8e651] Add hash partitioning.
-->
<para>
Allow the creation of partitions based on hashing a key (Amul Sul)
</para>
</listitem>
<listitem>
<!--
2018-01-19 [2f1784410] Allow UPDATE to move rows between partitions.
-->
<para>
Allow updated rows to automatically move to new partitions based on the
new row contents (Amit Khandekar)
</para>
</listitem>
<listitem>
<!--
2017-09-08 [6f6b99d13] Allow a partitioned table to have a default partition.
2018-04-11 [72cf7f310] Fix ALTER TABLE .. ATTACH PARTITION ... DEFAULT
-->
<para>
Allow partitioned tables to have a default partition (Jeevan Ladhe,
Beena Emerson, Ashutosh Bapat, Rahila Syed, Robert Haas)
</para>
<para>
The default partition can store rows that don't match any of the other
defined partitions, and is searched accordingly.
</para>
</listitem>
<listitem>
<!--
2018-02-19 [eb7ed3f30] Allow UNIQUE indexes on partitioned tables
2018-03-26 [555ee77a9] Handle INSERT .. ON CONFLICT with partitioned tables
-->
<para>
Allow UNIQUE indexes on partitioned tables if the partition key
guarantees uniqueness (&Aacute;lvaro Herrera, Amit Langote)
</para>
</listitem>
<listitem>
<!--
2018-01-19 [8b08f7d48] Local partitioned indexes
-->
<para>
Allow indexes on a partitioned table to be automatically created in any
child partitions (&Aacute;lvaro Herrera)
</para>
<para>
The new command ALTER INDEX ATTACH PARTITION allows indexes to be attached
to partitions. This does not behave as a global index since the
contents are private to each index. WARN WHEN USING AN EXISTING INDEX?
</para>
</listitem>
<listitem>
<!--
2018-04-04 [3de241dba] Foreign keys on partitioned tables
-->
<para>
Allow foreign keys on partitioned tables (&Aacute;lvaro Herrera)
</para>
</listitem>
<listitem>
<!--
2018-04-06 [3d956d956] Allow insert and update tuple routing and COPY for forei
-->
<para>
Allow INSERTs, UPDATEs, and COPY on partitioned tables to properly route
rows to foreign partitions (Etsuro Fujita, Amit Langote)
</para>
<para>
This is supported by postgres_fdw foreign tables.
</para>
</listitem>
<listitem>
<!--
2018-03-23 [86f575948] Allow FOR EACH ROW triggers on partitioned tables
-->
<para>
Allow FOR EACH ROW triggers on partitioned tables (&Aacute;lvaro Herrera)
</para>
<para>
Creation of a trigger on partitioned tables automatically creates
triggers on all partition tables, and on newly-created ones. This also
allows deferred unique constraints on partitioned tables.
</para>
</listitem>
<listitem>
<!--
2017-08-15 [e139f1953] Assorted preparatory refactoring for partition-wise join
2017-10-06 [f49842d1e] Basic partition-wise join functionality.
2018-02-16 [2fb1abaeb] Rename enable_partition_wise_join to enable_partitionwis
-->
<para>
Allow equality joins between partitioned tables with identically
partitioned child tables to join the child tables directly (Ashutosh
Bapat)
</para>
<para>
This features is disabled by default but can be enabled by changing
enable_partitionwise_join.
</para>
</listitem>
<listitem>
<!--
2018-01-26 [9fd8b7d63] Factor some code out of create_grouping_paths.
2018-03-22 [e2f1eb0ee] Implement partition-wise grouping/aggregation.
-->
<para>
Perform aggregation on each partition, and then merge the results
(Jeevan Chalke, Ashutosh Bapat, Robert Haas)
</para>
<para>
This features is disabled by default but can be enabled by changing
enable_partitionwise_aggregate.
</para>
</listitem>
<listitem>
<!--
2018-04-02 [7e0d64c7a] postgres_fdw: Push down partition-wise aggregation.
-->
<para>
Allow postgres_fdw to push down aggregates to foreign tables that are
partitions (Jeevan Chalke)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Parallel Queries</title>
<itemizedlist>
<listitem>
<!--
2018-02-02 [9da0cc352] Support parallel btree index builds.
-->
<para>
Allow indexes to be built in parallel (Peter
Geoghegan, Rushabh Lathia, Heikki Linnakangas)
</para>
</listitem>
<listitem>
<!--
2017-12-21 [180428404] Add parallel-aware hash joins.
-->
<para>
Allow hash joins to be performed in parallel using a shared hash table
(Thomas Munro)
</para>
</listitem>
<listitem>
<!--
2017-12-05 [ab7271677] Support Parallel Append plan nodes.
2018-03-22 [88ba0ae2a] Consider Parallel Append of partial paths for UNION [ALL
-->
<para>
Allow UNION to run each SELECT in parallel if the individual SELECTs cannot be
parallelized (Amit Khandekar, Robert Haas, Amul Sul)
</para>
</listitem>
<listitem>
<!--
same commits as above
2017-12-05 [ab7271677] Support Parallel Append plan nodes.
2018-03-22 [88ba0ae2a] Consider Parallel Append of partial paths for UNION [ALL
-->
<para>
Allow partition scans to more efficiently use parallel workers (Amit Khandekar, Robert
Haas, Amul Sul)
</para>
</listitem>
<listitem>
<!--
2017-08-29 [3452dc524] Push tuple limits through Gather and Gather Merge.
-->
<para>
Allow LIMIT to be passed to parallel workers (Robert Haas, Tom Lane)
</para>
<para>
This allows workers to reduce returned results and use targeted index
scans.
</para>
</listitem>
<listitem>
<!--
2017-11-15 [e5253fdc4] Add parallel_leader_participation GUC.
-->
<para>
Add server option parallel_leader_participation to control if the leader
executes subplans (Thomas Munro)
</para>
<para>
The default is enabled, meaning the leader will execute subplans.
</para>
</listitem>
<listitem>
<!--
2017-10-05 [e9baa5e9f] Allow DML commands that create tables to use parallel qu
-->
<para>
Allow parallelization of commands CREATE TABLE .. AS, SELECT INTO, and CREATE
MATERIALIZED VIEW (Haribabu Kommi)
</para>
</listitem>
<listitem>
<!--
2017-08-29 [bf11e7ee2] Propagate sort instrumentation from workers back to lead
-->
<para>
Add reporting of parallel worker sort activity to EXPLAIN (Robert Haas, Tom Lane)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Indexes</title>
<itemizedlist>
<listitem>
<!--
2018-04-07 [8224de4f4] Indexes with INCLUDE columns and their support in B-tree
-->
<para>
Allow indexes to INCLUDE columns that are not part of the unique
constraint but are available for index-only scans (Anastasia
Lubennikova, Alexander Korotkov, Teodor Sigaev)
</para>
<para>
This is also useful for including columns that don't have btree support.
</para>
</listitem>
<listitem>
<!--
2018-03-26 [2b2727343] Optimize btree insertions for common case of increasing
2018-04-10 [074251db6] Adjustments to the btree fastpath optimization.
-->
<para>
Remember the highest btree index page to optimize future monotonically
increasing index additions (Pavan Deolasee, Peter Geoghegan)
</para>
</listitem>
<listitem>
<!--
2017-09-22 [7c75ef571] hash: Implement page-at-a-time scan.
-->
<para>
Allow entire hash index pages to be scanned (Ashutosh Sharma)
</para>
<para>
Previously each hash index entry has to be locked and scanned
separately.
</para>
</listitem>
<listitem>
<!--
2018-03-27 [3ad55863e] Add predicate locking for GiST
2018-03-30 [43d1ed60f] Predicate locking in GIN index
2018-04-07 [b508a56f2] Predicate locking in hash indexes.
-->
<para>
Add predicate locking for Hash, GiST and GIN indexes (Shubham Barai)
</para>
<para>
This reduces the likelyhood of serialization conflicts. ACCURATE?
</para>
</listitem>
<listitem>
<!--
2018-03-27 [c203d6cf8] Allow HOT updates for some expression indexes
-->
<para>
Allow heap-only-tuple (HOT) updates for expression indexes when the
values of the expressions are unchanged (Konstantin Knizhnik)
</para>
</listitem>
</itemizedlist>
<sect5>
<title>SP-Gist</title>
<itemizedlist>
<listitem>
<!--
2018-04-03 [710d90da1] Add prefix operator for TEXT type.
-->
<para>
Add TEXT prefix operator ^@ which is supported by SP-GiST (Ildus
Kurbangaliev)
</para>
<para>
This is similar to using LIKE 'word%' with btree indexes, but is more efficient.
</para>
</listitem>
<listitem>
<!--
2017-12-25 [ff963b393] Add polygon opclass for SP-GiST
-->
<para>
Allow polygons to be indexed with SP-GiST (Nikita Glukhov, Alexander
Korotkov)
</para>
</listitem>
<listitem>
<!--
2017-12-22 [854823fa3] Add optional compression method to SP-GiST
-->
<para>
Allow SP-GiST indexes to optionally use compression (Teodor Sigaev,
Heikki Linnakangas, Alexander Korotkov, Nikita Glukhov)
</para>
</listitem>
</itemizedlist>
</sect5>
</sect4>
<sect4>
<title>Optimizer</title>
<itemizedlist>
<listitem>
<!--
2018-03-22 [b5db1d93d] Improve ANALYZE's strategy for finding MCVs.
-->
<para>
Improve the selection of the optimizer statistics' most-common-values
(Jeff Janes, Dean Rasheed)
</para>
<para>
Previously most-common-values (MCV) were chosen based on their
significance compared to all column values. Now, MCV are chosen based
on their significance compared to the non-MCV values. This improves the
statistics for uniform (fewer) and non-uniform (more) distributions.
</para>
</listitem>
<listitem>
<!--
2017-09-13 [7d08ce286] Distinguish selectivity of &lt; from &lt;= and &gt; from &gt;=.
-->
<para>
Improve selectivity estimates for &gt;= and &lt;= when the constants are not
common values (Tom Lane)
</para>
<para>
Previously such cases used the same selectivity as &gt; and &lt;,
respectively. This change is particularly useful for BETWEEN with
small ranges.
</para>
</listitem>
<listitem>
<!--
2017-10-08 [8ec5429e2] Reduce "X = X" to "X IS NOT NULL", if it's easy to do so
-->
<para>
Optimize var = var to var IS NOT NULL where equivalent (Tom Lane)
</para>
<para>
This leads to better selectivity estimates.
</para>
</listitem>
<listitem>
<!--
2017-11-29 [7ca25b7de] Fix neqjoinsel's behavior for semi/anti join cases.
-->
<para>
Improve row count optimizer estimates for EXISTS and NOT EXISTS queries (Tom
Lane)
</para>
</listitem>
<listitem>
<!--
2017-11-02 [7b6c07547] Teach planner to account for HAVING quals in aggregation
-->
<para>
Add optimizer selectivity costs for HAVING clauses (Tom Lane)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>General Performance</title>
<itemizedlist>
<listitem>
<!--
2018-03-21 [432bb9e04] Basic JIT provider and error handling infrastructure.
2018-03-22 [b96d550eb] Support for optimizing and emitting code in LLVM JIT pro
2018-03-22 [cc415a56d] Basic planner and executor integration for JIT.
2018-03-26 [32af96b2b] JIT tuple deforming in LLVM JIT provider.
2018-03-27 [f4f5845b3] Quick adaption of JIT tuple deforming to the fast defaul
2018-03-28 [9370462e9] Add inlining support to LLVM JIT provider.
-->
<para>
Add Just-In-time (JIT) compilation of plans run the by the executor
(Andres Freund)
</para>
</listitem>
<listitem>
<!--
2017-11-01 [7c70996eb] Allow bitmap scans to operate as index-only scans when p
-->
<para>
Allow bitmap scans to perform index-only scans when possible (Alexander
Kuzmenkov)
</para>
</listitem>
<listitem>
<!--
2018-03-29 [851a26e26] While vacuuming a large table, update upper-level FSM da
2018-03-30 [c79f6df75] Do index FSM vacuuming sooner.
-->
<para>
Update the free space map during vacuum (Claudio Freire)
</para>
<para>
This allows free space to be reused more quickly.
</para>
</listitem>
<listitem>
<!--
2017-09-01 [baaf272ac] Use group updates when setting transaction status in clo
-->
<para>
Improve performance of committing multiple concurrent transactions (Amit Kapila)
</para>
</listitem>
<listitem>
<!--
2017-10-08 [84ad4b036] Reduce memory usage of targetlist SRFs.
-->
<para>
Reduce memory usage for queries using set-returning functions in their
target lists (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2018-02-07 [1bc0100d2] postgres_fdw: Push down UPDATE/DELETE joins to remote se
-->
<para>
Allow postgres_fdw to push UPDATEs and DELETEs using joins to foreign
servers (Etsuro Fujita)
</para>
<para>
Previously only non-join UPDATEs and DELETEs were pushed.
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Monitoring</title>
<itemizedlist>
<listitem>
<!--
2017-09-01 [c039ba071] Add memory info to getrusage output
-->
<para>
Show memory usage in log_statement_stats, log_parser_stats,
log_planner_stats, log_executor_stats (Justin Pryzby, Peter Eisentraut)
</para>
</listitem>
<listitem>
<!--
2017-09-29 [5373bc2a0] Add background worker type
-->
<para>
Add pg_stat_activity.backend_type now shows the type of background worker
(Peter Eisentraut)
</para>
<para>
Add bgw_type to the background worker C structure (Peter Eisentraut)
</para>
<para>
This is displayed to the user in pg_stat_activity.backend_type and ps
output.
</para>
</listitem>
<listitem>
<!--
2017-12-04 [ab6eaee88] When VACUUM or ANALYZE skips a concurrently dropped tabl
-->
<para>
Have log_autovacuum_min_duration log skipped tables that are
concurrently being dropped (Nathan Bossart)
</para>
</listitem>
</itemizedlist>
<sect5>
<title>Information Schema</title>
<itemizedlist>
<listitem>
<!--
2018-02-07 [32ff26911] Add more information_schema columns
-->
<para>
Add information_schema columns related to table constraints and triggers
(Michael Paquier)
</para>
<para>
Specifically, table_constraints.enforced, triggers.action_order,
triggers.action_reference_old_table, and
triggers.action_reference_new_table.
</para>
</listitem>
</itemizedlist>
</sect5>
</sect4>
<sect4>
<title><acronym>Authentication</acronym></title>
<itemizedlist>
<listitem>
<!--
2017-11-18 [9288d62bb] Support channel binding 'tls-unique' in SCRAM
2017-12-19 [4bbf110d2] Add libpq connection parameter "scram_channel_binding"
2018-01-04 [d3fb72ea6] Implement channel binding tls-server-end-point for SCRAM
-->
<para>
Add libpq option to support channel binding when using SCRAM
authentication (Michael Paquier)
</para>
<para>
Channel binding requires the server end of the TLS connection to prove
that it knows the password. The options are
'scram_channel_binding=tls-unique' and
'scram_channel_binding=tls-server-end-point'.
</para>
<para>
WHAT DOES THIS DOC TEXT MEAN? "An empty value specifies that the client will not
use channel binding. The default value is tls-unique."
</para>
</listitem>
<listitem>
<!--
2017-09-12 [83aaac41c] Allow custom search filters to be configured for LDAP au
-->
<para>
Allow the server to specify more complex LDAP specifications in
search+bind mode (Thomas Munro)
</para>
<para>
Specifically, "ldapsearchfilter" allows pattern matching using
combinations of LDAP attributes.
</para>
</listitem>
<listitem>
<!--
2018-01-03 [35c0754fa] Allow ldaps when using ldap authentication
2018-01-04 [3ad2afc2e] Define LDAPS_PORT if it's missing and disable implicit L
-->
<para>
Allow LDAP authentication to use ldaps (Thomas Munro)
</para>
<para>
We already supported LDAP over TLS by using ldaptls=1. This new TLS
LDAP method of encrypted LDAP is enabled with ldapscheme=ldaps or
ldapurl=ldaps://.
</para>
</listitem>
<listitem>
<!--
2017-10-12 [cf1238cd9] Log diagnostic messages if errors occur during LDAP auth
-->
<para>
Improve LDAP logging of errors (Thomas Munro)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Permissions</title>
<itemizedlist>
<listitem>
<!--
2018-04-06 [0fdc8495b] Add default roles for file/program access
2018-04-07 [da9b580d8] Refactor dir/file permissions
-->
<para>
Add default roles which controls file system access (Stephen Frost)
</para>
<para>
Specifically, the new roles are: pg_read_server_files,
pg_write_server_files, pg_execute_server_program. These roles now also
control who can use COPY and extension file_fdw. Previously only
super-users could use these functions, and that is still the default
behavior.
</para>
</listitem>
<listitem>
<!--
2018-04-06 [e79350fef] Remove explicit superuser checks in favor of ACLs
-->
<para>
Allow access to file system functions to be controlled by GRANT/REVOKE
permissions, rather than super-user checks (Michael Paquier)
</para>
<para>
Specifically, these functions were modified: pg_ls_dir(), pg_read_file(),
pg_read_binary_file(), pg_stat_file().
</para>
</listitem>
<listitem>
<!--
2017-11-09 [5ecc0d738] Restrict lo_import()/lo_export() via SQL permissions not
2017-11-14 [6d776522d] Document changes in large-object privilege checking.
-->
<para>
Use GRANT/REVOKE to control access to lo_import() and lo_export()
(Michael Paquier)
</para>
<para>
Previously super users were exclusively granted to access these
functions.
</para>
<para>
Compile-time option ALLOW_DANGEROUS_LO_FUNCTIONS has been removed.
</para>
</listitem>
<listitem>
<!--
2017-12-05 [ab3f008a2] postgres_fdw: Judge password use by run-as user, not ses
-->
<para>
Use view owner not session owner when preventing non-password access to
postgres_fdw tables (Robert Haas)
</para>
<para>
Postgres only allows super-users to access postgres_fdw tables without
passwords, e.g. via peer. Previously the session owner had to be a
super-user to allow such access; now the view owner is checked instead.
</para>
</listitem>
<listitem>
<!--
2018-04-14 [50c6bb022] Fix enforcement of SELECT FOR UPDATE permissions with ne
-->
<para>
Fix invalid locking permission check in SELECT FOR UPDATE on views (Tom
Lane)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Server Configuration</title>
<itemizedlist>
<listitem>
<!--
2018-03-17 [8a3d94252] Add ssl_passphrase_command setting
-->
<para>
Add server setting ssl_passphrase_command to allow supplying of the the
passphrase for SSL key files (Peter Eisentraut)
</para>
<para>
Also add ssl_passphrase_command_supports_reload to specify whether the
the SSL configuration should be reloaded and ssl_passphrase_command
called during a server configuration reload.
</para>
</listitem>
<listitem>
<!--
2017-11-20 [c2513365a] Parameter toast_tuple_target controls TOAST for new rows
-->
<para>
Add server variable toast_tuple_target to control the minimum length
before TOAST storage will be considered for new rows (Simon Riggs)
</para>
<para>
The default TOAST threshold has not been changed.
</para>
</listitem>
<listitem>
<!--
2017-09-12 [6e7baa322] Introduce BYTES unit for GUCs.
-->
<para>
Allow bytes to be specified for server variable sizes (Beena Emerson)
</para>
<para>
The specification is "B".
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><link linkend="wal">Write-Ahead Log</link> (<acronym>WAL</acronym>)</title>
<itemizedlist>
<listitem>
<!--
2017-09-19 [fc49e24fa] Make WAL segment size configurable at initdb time.
-->
<para>
Allow the WAL file size to be set via initdb (Beena Emerson)
</para>
<para>
Previously the 16MB default could only be changed at compile time.
</para>
</listitem>
<listitem>
<!--
2017-11-07 [4b0d28de0] Remove secondary checkpoint
-->
<para>
No longer retain WAL that spans two checkpoints (Simon Riggs)
</para>
<para>
The retention of WAL records for only one checkpoint is required.
</para>
</listitem>
<listitem>
<!--
2018-03-30 [4a33bb59d] Ensure that WAL pages skipped by a forced WAL switch are
-->
<para>
Fill the unused portion of force-switched WAL segment files with zeros
for improved compressibility (Chapman Flack)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Base Backup and Streaming Replication</title>
<itemizedlist>
<listitem>
<!--
2018-04-07 [5dfd1e5a6] Logical decoding of TRUNCATE
2018-04-07 [039eb6e92] Logical replication support for TRUNCATE
-->
<para>
Replicate TRUNCATE activity when using logical replication (Simon Riggs,
Marco Nenciarini, Peter Eisentraut)
</para>
</listitem>
<listitem>
<!--
2018-03-28 [1eb6d6527] Store 2PC GID in commit/abort WAL recs for logical decod
-->
<para>
Pass prepared transaction information to logical replication subscribers
(Nikhil Sontakke, Stas Kelvich)
</para>
</listitem>
<listitem>
<!--
2018-03-23 [8694cc96b] Exclude unlogged tables from base backups
2018-03-27 [920a5e500] Skip temp tables from basebackup.
-->
<para>
Exclude unlogged and temporary tables from streaming base backups (David
Steele)
</para>
<para>
There is no need to copy such files.
</para>
</listitem>
<listitem>
<!--
2018-04-03 [4eb77d50c] Validate page level checksums in base backups
-->
<para>
Allow heap pages checksums to be checked during streaming base backup
(Michael Banck)
</para>
</listitem>
<listitem>
<!--
2018-01-17 [9c7d06d60] Ability to advance replication slots
-->
<para>
Allow replication slots to be advanced programatically, rather than be
consumed by subscribers (Petr Jelinek)
</para>
<para>
This allows efficient advancement replication slots when the contents do
not need to be consumed. This is performed by pg_replication_slot_advance().
</para>
</listitem>
<listitem>
<!--
2018-01-06 [6271fceb8] Add TIMELINE to backup_label file
-->
<para>
Add timeline information to the backup_label file (Simon Riggs)
</para>
<para>
Also add a check that the WAL timeline matches the backup_label file's
timeline.
</para>
</listitem>
<listitem>
<!--
2018-03-31 [9a895462d] Enhance pg_stat_wal_receiver view to display host and po
-->
<para>
Add host and port connection information to the pg_stat_wal_receiver
system view (Haribabu Kommi)
</para>
</listitem>
<listitem>
<!--
2017-11-07 [98267ee83] Exclude pg_internal.init from BASE_BACKUP
-->
<para>
Document that pg_internal.init files do not need to be included in the
base backup (David Steele)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Window Functions</title>
<itemizedlist>
<listitem>
<!--
2018-02-07 [0a459cec9] Support all SQL:2011 options for window frame clauses.
2018-02-24 [8b29e88cd] Add window RANGE support for float4, float8, numeric.
-->
<para>
Add window function features to complete SQL:2011 compliance (Oliver
Ford, Tom Lane)
</para>
<para>
Specifically, allow RANGE mode to use PRECEDING and FOLLOWING to specify
peer groups with values plus or minus the specified offset. Add
GROUPS mode to include plus or minus the number of peer groups. Frame
exclusion syntax was also added.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Utility Commands</title>
<itemizedlist>
<listitem>
<!--
2018-03-28 [16828d5c0] Fast ALTER TABLE ADD COLUMN with a non-NULL default
-->
<para>
Allow NOT NULL to be added to columns without requiring a table rewrite
(Andrew Dunstan, Serge Rielau)
</para>
</listitem>
<listitem>
<!--
2018-03-30 [34c20de4d] Allow to lock views.
2018-03-31 [1b26bd408] Fix bug with view locking code.
-->
<para>
Allow views to be locked by locking the underlying tables (Yugo Nagata)
</para>
</listitem>
<listitem>
<!--
2017-09-06 [5b6d13eec] Allow SET STATISTICS on expression indexes
-->
<para>
Allow ALTER INDEX to set statistics-gathering targets for expression
indexes (Alexander Korotkov, Adrien nayrat)
</para>
<para>
In psql, \d+ now shows the statistics target for indexes.
</para>
</listitem>
<listitem>
<!--
2017-10-03 [11d8d72c2] Allow multiple tables to be specified in one VACUUM or A
-->
<para>
Allow multiple tables to be specified in one VACUUM or ANALYZE command
(Nathan Bossart)
</para>
<para>
Also, if any table mentioned in VACUUM uses a column list, then ANALYZE
keyword must be supplied; previously ANALYZE was implied in such cases.
</para>
</listitem>
<listitem>
<!--
2018-03-05 [854dd8cff] Add parenthesized options syntax for ANALYZE.
-->
<para>
Add parenthesized options syntax to ANALYZE (Nathan Bossart)
</para>
<para>
This is similar to the syntax supported by VACUUM.
</para>
</listitem>
<listitem>
<!--
2017-10-14 [4de2d4fba] Explicitly track whether aggregate final functions modif
2017-10-16 [be0ebb65f] Allow the built-in ordered-set aggregates to share trans
-->
<para>
Add CREATE AGGREGATE option to specify the behavior of the aggregate
finalization function (Tom Lane)
</para>
<para>
This is useful for allowing aggregate functions be optimized and to work
as window functions.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Data Types</title>
<itemizedlist>
<listitem>
<!--
2017-09-30 [c12d570fa] Support arrays over domains.
-->
<para>
Allow the creation of arrays of domains (Tom Lane)
</para>
<para>
This also allows array_agg() to be used on domains.
</para>
</listitem>
<listitem>
<!--
2017-10-26 [37a795a60] Support domains over composite types.
2017-10-26 [820c0305f] Support domains over composite types in PL/Tcl.
2017-10-28 [60651e4cd] Support domains over composite types in PL/Perl.
2017-11-16 [687f096ea] Make PL/Python handle domain-type conversions correctly.
-->
<para>
Support domains over composite types (Tom Lane)
</para>
<para>
Also allow PL/PL/Perl, PL/Python, and PL/Tcl to handle composite-domain
function arguments and results. Also improve PL/Python domain handling.
</para>
</listitem>
<listitem>
<!--
2018-03-29 [c0cbe00fe] Add casts from jsonb
-->
<para>
Add casts from jsonb scalars to numeric and boolean data types
(Anastasia Lubennikova)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Functions</title>
<itemizedlist>
<listitem>
<!--
2018-02-22 [10cfce34c] Add user-callable SHA-2 functions
-->
<para>
Add SHA-2 family of hash functions (Peter Eisentraut)
</para>
<para>
Specifically, sha224(), sha256(), sha384(), sha512() were added.
</para>
</listitem>
<listitem>
<!--
2017-08-31 [81c5e46c4] Introduce 64-bit hash functions with a 64-bit seed.
-->
<para>
Add support for 64-bit non-cryptographic hash functions (Robert Haas, Amul Sul)
</para>
</listitem>
<listitem>
<!--
2018-01-09 [11b623dd0] Implement TZH and TZM timestamp format patterns
-->
<para>
Allow to_char() and to_timestamp() to specify the time zone's hours and
minutes from UTC (Nikita Glukhov, Andrew Dunstan)
</para>
<para>
This is done with format specifications TZH and TZM.
<!--
2018-01-09 [69c3936a1] Expression evaluation based aggregate transition invocat
-->
</para>
<para>
Improve the speed of aggregate computations (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2018-04-05 [1664ae197] Add websearch_to_tsquery
-->
<para>
Add text search function websearch_to_tsquery() that supports a queries
syntax similar to that used by web search engines (Victor Drobny, Dmitry
Ivanov)
</para>
</listitem>
<listitem>
<!--
2018-04-07 [1c1791e00] Add json(b)_to_tsvector function
-->
<para>
Add functionjson(b)_to_tsvector to create usable text search queries
matching JSON/JSONB values (Dmitry Dolgov)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Server-Side Languages</title>
<itemizedlist>
<listitem>
<!--
2017-11-30 [e4128ee76] SQL procedures
2018-02-22 [76b6aa41f] Support parameters in CALL
2018-03-14 [33803f67f] Support INOUT arguments in procedures
2018-04-14 [a8677e3ff] Support named and default arguments in CALL
-->
<para>
Add SQL procedures, which can start and commit their own transactions
(Peter Eisentraut)
</para>
<para>
They are created with the new CREATE PROCEDURE command and invoked via
CALL. The new ALTER/DROP ROUTINE commands allows altering/dropping of
procedures, functions, and aggregates.
</para>
</listitem>
<listitem>
<!--
2018-01-22 [8561e4840] Transaction control in PL procedures
2018-03-28 [d92bc83c4] PL/pgSQL: Nested CALL with transactions
2018-03-28 [056a5a3f6] Allow committing inside cursor loop
2018-04-05 [b981275b6] PL/pgSQL: Add support for SET TRANSACTION
-->
<para>
Add transaction control to PL/pgSQL, PL/Perl, PL/Python, PL/Tcl, and SPI
server-side languages (Peter Eisentraut)
</para>
<para>
Transaction control is only available to top-transaction-level CALLs or
in nested PL/pgSQL DO and CALL blocks that only contain other PL/pgSQL
DO and CALL blocks. ACCURATE?
</para>
</listitem>
<listitem>
<!--
2018-02-13 [f9263006d] Support CONSTANT/NOT NULL/initial value for plpgsql comp
-->
<para>
Add the ability to define PL/pgSQL record types as not null, constant, or
with initial values (Tom Lane)
</para>
</listitem>
<listitem>
<!--
2018-03-28 [3f44e3db7] Transforms for jsonb to PL/Python
-->
<para>
Add extension jsonb_plpython to transform JSONB to/from PL/Python
types (Anthony Bykov)
</para>
</listitem>
<listitem>
<!--
2018-04-03 [341e16618] Transforms for jsonb to PL/Perl
-->
<para>
Add extension jsonb_plpython to transform JSONB to/from PL/Perl types
(Anthony Bykov)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Client Interfaces</title>
<itemizedlist>
<listitem>
<!--
2018-03-06 [0c2c81b40] doc: Add replication parameter to libpq documentation
-->
<para>
Add libpq parameter to allow physical and logical replication
connections (Michael Paquier)
</para>
<para>
The libpq connection parameter is called replication.
</para>
</listitem>
<listitem>
<!--
2018-03-17 [e3bdb2d92] Set libpq sslcompression to off by default
-->
<para>
Change libpq to disable compression by default (Peter Eisentraut)
</para>
<para>
Compression is already disabled in modern OpenSSL versions and the libpq
setting had no effect in that case.
</para>
</listitem>
<listitem>
<!--
2017-08-25 [d22e9d530] Implement DO CONTINUE action for ECPG WHENEVER statement
-->
<para>
Add DO CONTINUE action to the ECPG WHENEVER statement (Vinayak Pokale)
</para>
<para>
This generates a C 'continue' statement, causing a return to the top of
the contained loop when the specified condition occurs.
</para>
</listitem>
<listitem>
<!--
2018-03-14 [3b7ab4380] Add Oracle like handling of char arrays.
-->
<para>
Add ecpg mode to enable Oracle Pro*C handling of char arrays.
</para>
<para>
This mode is enabled with -C.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Client Applications</title>
<sect4>
<title><xref linkend="app-psql"/></title>
<itemizedlist>
<listitem>
<!--
2017-09-05 [49ca462eb] Add \gdesc psql command.
-->
<para>
Add psql command \gdesc to display the column names and types of the
query output (Pavel Stehule)
</para>
</listitem>
<listitem>
<!--
2017-09-12 [69835bc89] Add psql variables to track success/failure of SQL queri
-->
<para>
Add psql variables to report query activity and errors (Fabien Coelho)
</para>
<para>
Specifically, the new variables are ERROR, SQLSTATE, ROW_COUNT,
LAST_ERROR_MESSAGE, and LAST_ERROR_SQLSTATE.
</para>
</listitem>
<listitem>
<!--
2017-09-21 [d57c7a7c5] Provide a test for variable existence in psql
-->
<para>
Allow psql to test for the existence of a variable (Fabien Coelho)
</para>
<para>
Specifically , the syntax :{?variable_name} allows a variable's
existence to be tested in an \if statement.
</para>
</listitem>
<listitem>
<!--
2017-09-05 [5e8304fdc] In psql, use PSQL_PAGER in preference to PAGER, if it's
-->
<para>
Add PSQL_PAGER to control psql's pager (Pavel Stehule)
</para>
<para>
This allows psql's default pager to be specified as a separate environment
variable from the pager for other applications. PAGER is still honored
if PSQL_PAGER is not set.
</para>
</listitem>
<listitem>
<!--
2017-11-23 [05b6ec39d] Show partition info from psql \d+
-->
<para>
Have psql \d+ show a partition count of zero (Amit Langote)
</para>
<para>
Previously no partition information would be displayed for such tables.
Also indicate which partitions are themselves partitioned.
ACCURATE?
</para>
</listitem>
<listitem>
<!--
2018-01-29 [15be27460] Avoid misleading psql password prompt when username is m
-->
<para>
Have psql report the proper user name before the password prompt (Tom
Lane)
</para>
<para>
Previously, combinations of -U and a user name embedded in a URI caused
incorrect reporting. Also suppress the user name before the password
prompt when --password is specified.
</para>
</listitem>
<listitem>
<!--
2018-02-01 [df9f599bc] psql: Add quit/help behavior/hint, for other tool porta
-->
<para>
Allow 'quit' and 'exit' to exit psql when used in an empty buffer (Bruce
Momjian)
</para>
<para>
Also add hints of how to exit when 'quit' and 'exit' are used alone on a
line in a non-empty buffer. Add a similar hint for 'help'.
</para>
</listitem>
<listitem>
<!--
2018-02-12 [91389228a] psql: give ^D hint for \q in place where \q is ignored
-->
<para>
Have psql hint at using control-D when \q is entered alone on a line but
ignored (Bruce Momjian)
</para>
<para>
For example, \q does not exit when supplied in character strings.
</para>
</listitem>
<listitem>
<!--
2018-03-03 [2b8c94e1b] Improve tab-completion for ALTER INDEX RESET/SET.
-->
<para>
Improve tab-completion for ALTER INDEX RESET/SET (Masahiko Sawada)
</para>
</listitem>
<listitem>
<!--
2018-03-05 [722408bcd] Add infrastructure to support server-version-dependent t
-->
<para>
Add infrastructure to allow psql to customize tab completion queries
based on the server version (Tom Lane)
</para>
<para>
Previously tab completion queries could fail.
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="pgbench"/></title>
<itemizedlist>
<listitem>
<!--
2018-01-09 [bc7fa0c15] Improve scripting language in pgbench
-->
<para>
Add major scripting features to pgbench (Fabien Coelho)
</para>
</listitem>
<listitem>
<!--
2018-03-22 [f67b113ac] Add \if support to pgbench
-->
<para>
Add \if macro support to pgbench (Fabien Coelho)
</para>
</listitem>
<listitem>
<!--
2017-09-04 [9d36a3866] Adjust pgbench to allow non-ASCII characters in variable
-->
<para>
Allow the use of non-ASCII characters in pgbench variable names (Fabien
Coelho)
</para>
</listitem>
<listitem>
<!--
2017-11-13 [591c504fa] Allow running just selected steps of pgbench's initializ
-->
<para>
Add pgbench option --init-steps to control the initialization steps
performed (Masahiko Sawada)
</para>
</listitem>
<listitem>
<!--
2017-12-14 [1fcd0adeb] Add approximated Zipfian-distributed random generator to
-->
<para>
Add approximated Zipfian-distributed random generator to pgbench (Alik
Khilazhev)
</para>
</listitem>
<listitem>
<!--
2018-03-26 [64f85894a] Set random seed for pgbench.
-->
<para>
Allow the random seed to be set in pgbench (Fabien Coelho)
</para>
</listitem>
<listitem>
<!--
2017-12-27 [7a727c180] Add pow(), aka power(), function to pgbench.
-->
<para>
Allow pgbench to do exponentiation with pow() and power() (Ra&uacute;l
Mar&iacute;n Rodr&iacute;guez)
</para>
</listitem>
<listitem>
<!--
2018-03-21 [e51a04840] Add general purpose hasing functions to pgbench.
-->
<para>
Add hashing functions to pgbench (Ildar Musin)
</para>
</listitem>
<listitem>
<!--
2017-09-04 [c23bb6bad] Fix some subtle problems in pgbench transaction stats co
2017-11-21 [16827d442] pgbench: fix stats reporting when some transactions are
-->
<para>
Make pgbench statistics more accurate when using --latency-limit and
--rate (Fabien Coelho)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Server Applications</title>
<itemizedlist>
<listitem>
<!--
2017-09-27 [3709ca1cf] pg_basebackup: Add option to create replication slot
-->
<para>
Add pg_basebackup option to create a named replication slot (Michael Banck)
</para>
<para>
The option --create-slot creates the named replication slot (--slot)
when the WAL streaming method (-wal-method=stream) is used.
</para>
<para>
IS IT CLEAR FROM THE DOCS THAT THE REPLICATION SLOT IS NOT TEMPORARY?
</para>
</listitem>
<listitem>
<!--
2018-04-07 [c37b3d08c] Allow group access on PGDATA
-->
<para>
Allow initdb to set group read access to the data directory (David
Steele)
</para>
<para>
This is accomplished with the initdb --allow-group-access flag.
Administrators can also set group permissions on the empty data
directory before running initdb. Server variable data_directory_mode
allows reading of data directory group permissions.
</para>
</listitem>
<listitem>
<!--
2018-04-05 [1fde38bea] Allow on-line enabling and disabling of data checksums
2018-04-09 [a228cc13a] Revert "Allow on-line enabling and disabling of data che
-->
<para>
Add pg_verify_checksums tool to verify database checksums while offline
(Magnus Hagander)
</para>
</listitem>
<listitem>
<!--
2018-03-25 [bf4a8676c] pg_resetwal: Allow users to change the WAL segment size
-->
<para>
Allow pg_resetwal to change the WAL segment size via --wal-segsize (Nathan
Bossart)
</para>
</listitem>
<listitem>
<!--
2018-03-24 [e22b27f0c] Add long options to pg_resetwal and pg_controldata
-->
<para>
Add long options to pg_resetwal and pg_controldata (Nathan Bossart,
Peter Eisentraut)
</para>
</listitem>
<listitem>
<!--
2017-10-29 [5f3971291] pg_receivewal: Add - -no-sync option.
-->
<para>
Add pg_receivewal option --no-sync to prevent synchronous WAL writes
(Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2017-09-11 [6d9fa5264] pg_receivewal: Add - -endpos option
-->
<para>
Add pg_receivewal option --endpos to specify when WAL receiving should
stop (Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2017-10-01 [2e83db3ad] Allow pg_ctl kill to send SIGKILL.
-->
<para>
Allow pg_ctl to send the SIGKILL signal to processes (Andres Freund)
</para>
<para>
This was originally unsupported due to concerns over its misuse.
</para>
</listitem>
<listitem>
<!--
2018-03-29 [266b6acb3] Make pg_rewind skip files and directories that are remov
-->
<para>
Reduce the number of files copied by pg_rewind (Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2018-04-09 [5d5aeddab] Make sure pg_rewind can't run as root
-->
<para>
Prevent pg_rewind from running as root (Magnus Hagander)
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="app-pgdump"><application>pg_dump</application></link>,
<link linkend="app-pg-dumpall"><application>pg_dumpall</application></link>,
<link linkend="app-pgrestore"><application>pg_restore</application></link></title>
<itemizedlist>
<listitem>
<!--
2017-09-01 [84be67181] pg_dumpall: Add a -E flag to set the encoding, like pg_d
-->
<para>
Add pg_dumpall option --encoding to control encoding (Michael Paquier)
</para>
<para>
pg_dump already had this option.
</para>
</listitem>
<listitem>
<!--
2017-08-14 [23d7680d0] pg_dump: Add a - -load-via-partition-root option.
-->
<para>
Add pg_dump option --load-via-partition-root to force loading of data
into the partition's root table, rather than the original partitions
(Rushabh Lathia)
</para>
<para>
This is useful if the system to be loaded has a different collation
definitions or endianness, requiring the rows to be stored in different partitions.
</para>
</listitem>
<listitem>
<!--
2018-01-25 [1368e92e1] Support - -no-comments in pg_dump, pg_dumpall, pg_restore
-->
<para>
Add ability to suppress dumping and restoring of comments (Robins Tharakan)
</para>
<para>
The new pg_dump, pg_dumpall, and pg_restore option is --no-comments.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Source Code</title>
<itemizedlist>
<listitem>
<!--
2018-01-21 [1cc4f536e] Support huge pages on Windows
-->
<para>
Add support for with huge(large) pages on Windows (Takayuki Tsunakawa,
Thomas Munro)
</para>
</listitem>
<listitem>
<!--
2018-04-04 [f044d71e3] Use ARMv8 CRC instructions where available.
-->
<para>
Add support for ARMv8 hardware CRC calculations (Yuqi Gu, Heikki Linnakangas)
</para>
</listitem>
<listitem>
<!--
2018-03-20 [5b2526c83] Add configure infrastructure (- -with-llvm) to enable LLV
-->
<para>
Add configure flag --with-llvm to test for LLVM support (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2018-03-20 [6869b4f25] Add C++ support to configure.
-->
<para>
Have configure check for the availability of a C++ compiler (Andres
Freund)
</para>
</listitem>
<listitem>
<!--
2017-09-06 [1c53f612b] Escape &lt; and &amp; in SGML
2017-10-17 [c29c57890] Don't use SGML empty tags
2017-10-20 [1ff01b390] Convert SGML IDs to lower case
2017-11-23 [3c49c6fac] Convert documentation to DocBook XML
-->
<para>
Convert documentation to DocBook XML (Peter Eisentraut, Alexander
Lakhin, J&uuml;rgen Purtz)
</para>
<para>
The file names still use an 'sgml' extension for compatibility with back
branches.
</para>
</listitem>
<listitem>
<!--
2018-03-03 [a351679c8] Trivial adjustments in preparation for bootstrap data co
2018-04-08 [372728b0d] Replace our traditional initial-catalog-data format with
2018-04-26 [a0854f107] Avoid parsing catalog data twice during BKI file constru
-->
<para>
Overhaul the way system tables are defined for bootstrap use (John
Naylor)
</para>
</listitem>
<listitem>
<!--
2018-04-05 [eed1ce72e] Allow background workers to bypass datallowconn
-->
<para>
Allow background workers to attach to databases that normally disallow
connections (Magnus Hagander)
</para>
</listitem>
<listitem>
<!--
2017-10-04 [212e6f34d] Replace binary search in fmgr_isbuiltin with a lookup ar
-->
<para>
Speed up lookups of builtin function names matching oids (Andres Freund)
</para>
<para>
The previous binary search now uses a lookup array.
</para>
</listitem>
<listitem>
<!--
2017-10-11 [1de09ad8e] Add more efficient functions to pqformat API.
-->
<para>
Speed up construction of query results (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2017-10-13 [141fd1b66] Improve sys/catcache performance.
-->
<para>
Improve access speed to system caches (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2017-11-23 [a4ccc1cef] Generational memory allocator
-->
<para>
Add a generational memory allocator which is optimized for serial
allocation/deallocation (Tomas Vondra)
</para>
<para>
This reduces memory usage for logical decoding.
</para>
</listitem>
<listitem>
<!--
2018-03-22 [7c91a0364] Sync up our various ways of estimating pg_class.reltuple
-->
<para>
Make the computation of system column pg_class.reltuples consistent
(Tomas Vondra)
</para>
</listitem>
<listitem>
<!--
2018-04-25 [46cda5bf7] Change pgindent/README to specify that we use perltidy v
-->
<para>
Update to use perltidy version 20170521 (Tom Lane)
</para>
</listitem>
<listitem>
<!--
2017-09-29 [8b304b8b7] Remove replacement selection sort.
-->
<para>
Remove the ability to perform replacement sorts (Peter Geoghegan)
</para>
<para>
Replacement sorts were determined to be no longer useful. Also remove
server variable replacement sorts.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Additional Modules</title>
<itemizedlist>
<listitem>
<!--
2017-08-21 [79ccd7cbd] pg_prewarm: Add automatic prewarm feature.
-->
<para>
Allow extension pg_prewarm to restore the previous shared buffer
contents on startup (Mithun Cy, Robert Haas)
</para>
<para>
This is accomplished by having pg_prewarm store the shared buffer
relation/offset values to disk occasionally during server operation and
shutdown.
</para>
</listitem>
<listitem>
<!--
2018-03-21 [be8a7a686] Add strict_word_similarity to pg_trgm module
-->
<para>
Add pgtrgm function strict_word_similarity() to compute the similarity
of whole words (Alexander Korotkov)
</para>
<para>
The function word_similarity() already existed for this purpose, but it
was designed to find similar parts of words, while
strict_word_similarity() computes the similarity to whole words.
</para>
</listitem>
<listitem>
<!--
2017-09-19 [f24649976] Add citext_pattern_ops for citext contrib module
-->
<para>
Allow creation of indexes on citext-extension columns that can be used
by LIKE comparisons (Alexey Chernyshov)
</para>
<para>
Specifically, indexes must be created using the citext_pattern_ops
operator class.
</para>
</listitem>
<listitem>
<!--
2018-04-05 [f4cd7102b] Add support of bool, bpchar, name and uuid to btree_gin
-->
<para>
Allow btree_gin to index bool, bpchar, name and uuid data types (Matheus
Oliveira)
</para>
</listitem>
<listitem>
<!--
2017-11-20 [de1d042f5] Support index-only scans in contrib/cube and contrib/seg
-->
<para>
Allow cube and seg extensions using GiST indexes to perform index-only
scans (Andrey Borodin)
</para>
</listitem>
<listitem>
<!--
2018-01-11 [f50c80dbb] llow negative coordinate for ~&gt; (cube, int) operator
-->
<para>
Allow retrieval of negative cube coordinates using the ~&gt; operator
(Alexander Korotkov)
</para>
<para>
This is useful for knn-gist searches. HOW?
</para>
</listitem>
<listitem>
<!--
2017-08-16 [ec0a69e49] Extend the default rules file for contrib/unaccent with
-->
<para>
Add Vietnamese letter detection to the unaccent extension (Dang Minh Huong, Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2018-03-31 [7f563c09f] Add amcheck verification of heap relations belonging to
-->
<para>
Enhance contrib/amcheck to check that each heap tuple has an index entry
(Peter Geoghegan)
</para>
</listitem>
<listitem>
<!--
2018-04-06 [11523e860] Support new default roles with adminpack
-->
<para>
Have contrib/adminpack use the new default file system access roles
(Stephen Frost)
</para>
<para>
Previously only super-users could call adminpack functions; now role
permissions are checked.
</para>
</listitem>
<listitem>
<!--
2017-10-11 [cff440d36] pg_stat_statements: Widen query IDs from 32 bits to 64 b
-->
<para>
Increase pg_stat_statement's query id to 64 bits (Robert Haas)
</para>
<para>
This greatly reduces the chance of query id hash collisions. The query
id can now potentially display as a negative value.
</para>
</listitem>
<listitem>
<!--
2018-04-05 [1fd869066] Install errcodes.txt for use by extensions.
-->
<para>
Install errcodes.txt to provide access to the error codes reported by
Postgres (Thomas Munro)
</para>
</listitem>
<listitem>
<!--
2018-03-21 [846b5a525] Prevent extensions from creating custom GUCs that are GU
-->
<para>
Prevent extensions from creating custom server variables that take a
quoted list of values (Tom Lane)
</para>
<para>
This was never intended to be supported.
</para>
</listitem>
<listitem>
<!--
2017-11-17 [527878635] Remove contrib/start-scripts/osx/.
-->
<para>
Remove contrib/start-scripts/osx since they are no longer recommended
(Tom Lane)
</para>
</listitem>
<listitem>
<!--
2017-09-22 [5d3cad564] Remove contrib/chkpass
-->
<para>
Remove extension chkpass (Peter Eisentraut)
</para>
<para>
This extension no longer served as a usable security tool or example of
how to write an extension.
</para>
</listitem>
</itemizedlist>
</sect3>
</sect2>
<sect2>
<title>Acknowledgments</title>
<para>
The following individuals (in alphabetical order) have contributed to this
release as patch authors, committers, reviewers, testers, or reporters of
issues.
</para>
<simplelist>
<member>XXX</member>
</simplelist>
</sect2>
</sect1>
doc/src/sgml/release.sgml
View file @ 5631c99d
......@@ -76,6 +76,7 @@ For new features, add links to the documentation sections.
The reason for splitting the release notes this way is so that appropriate
subsets can easily be copied into back branches.
-->
&release-11;
&release-10;
&release-9.6;
&release-9.5;
......
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