E.12. Release 13
Release date: 2020-09-24
E.12.1. Overview
PostgreSQL 13 contains many new features and enhancements, including:
-
Space savings and performance gains from de-duplication of B-tree index entries
-
Improved performance for queries that use aggregates or partitioned tables
-
Better query planning when using extended statistics
-
Parallelized vacuuming of indexes
-
Incremental sorting
The above items and other new features of PostgreSQL 13 are explained in more detail in the sections below.
E.12.2. Migration to Version 13
A dump/restore using pg_dumpall or use of pg_upgrade or logical replication is required for those wishing to migrate data from any previous release. See Section 18.6 for general information on migrating to new major releases.
Version 13 contains a number of changes that may affect compatibility with previous releases. Observe the following incompatibilities:
-
Change
SIMILAR TO ... ESCAPE NULL
to returnNULL
(Tom Lane)This new behavior matches the SQL specification. Previously a null
ESCAPE
value was taken to mean using the default escape string (a backslash character). This also applies tosubstring(
. The previous behavior has been retained in old views by keeping the original function unchanged.text
FROMpattern
ESCAPEtext
) -
Make
json[b]_to_tsvector()
fully check the spelling of itsstring
option (Dominik Czarnota) -
Change the way non-default effective_io_concurrency values affect concurrency (Thomas Munro)
Previously, this value was adjusted before setting the number of concurrent requests. The value is now used directly. Conversion of old values to new ones can be done using:
SELECT round(sum(
OLDVALUE
/ n::float)) AS newvalue FROM generate_series(1,OLDVALUE
) s(n); -
Prevent display of auxiliary processes in pg_stat_ssl and pg_stat_gssapi system views (Euler Taveira)
Queries that join these views to pg_stat_activity and wish to see auxiliary processes will need to use left joins.
-
Rename various wait events to improve consistency (Fujii Masao, Tom Lane)
-
Fix
ALTER FOREIGN TABLE ... RENAME COLUMN
to return a more appropriate command tag (Fujii Masao)Previously it returned
ALTER TABLE
; now it returnsALTER FOREIGN TABLE
. -
Fix
ALTER MATERIALIZED VIEW ... RENAME COLUMN
to return a more appropriate command tag (Fujii Masao)Previously it returned
ALTER TABLE
; now it returnsALTER MATERIALIZED VIEW
. -
Rename configuration parameter
wal_keep_segments
to wal_keep_size (Fujii Masao)This determines how much WAL to retain for standby servers. It is specified in megabytes, rather than number of files as with the old parameter. If you previously used
wal_keep_segments
, the following formula will give you an approximately equivalent setting:wal_keep_size = wal_keep_segments * wal_segment_size (typically 16MB)
-
Remove support for defining operator classes using pre- PostgreSQL 8.0 syntax (Daniel Gustafsson)
-
Remove support for defining foreign key constraints using pre- PostgreSQL 7.3 syntax (Daniel Gustafsson)
-
Remove support for "opaque" pseudo-types used by pre- PostgreSQL 7.3 servers (Daniel Gustafsson)
-
Remove support for upgrading unpackaged (pre-9.1) extensions (Tom Lane)
The
FROM
option ofCREATE EXTENSION
is no longer supported. Any installations still using unpackaged extensions should upgrade them to a packaged version before updating to PostgreSQL 13. -
Remove support for
posixrules
files in the timezone database (Tom Lane)IANA's timezone group has deprecated this feature, meaning that it will gradually disappear from systems' timezone databases over the next few years. Rather than have a behavioral change appear unexpectedly with a timezone data update, we have removed PostgreSQL 's support for this feature as of version 13. This affects only the behavior of POSIX-style time zone specifications that lack an explicit daylight savings transition rule; formerly the transition rule could be determined by installing a custom
posixrules
file, but now it is hard-wired. The recommended fix for any affected installations is to start using a geographical time zone name. -
In ltree , when an
lquery
pattern contains adjacent asterisks with braces, e.g.,*{2}.*{3}
, properly interpret that as*{5}
(Nikita Glukhov) -
Fix pageinspect 's
bt_metap()
to return more appropriate data types that are less likely to overflow (Peter Geoghegan)
E.12.3. Changes
Below you will find a detailed account of the changes between PostgreSQL 13 and the previous major release.
E.12.3.1. Server
E.12.3.1.1. Partitioning
-
Allow pruning of partitions to happen in more cases (Yuzuko Hosoya, Amit Langote, Álvaro Herrera)
-
Allow partitionwise joins to happen in more cases (Ashutosh Bapat, Etsuro Fujita, Amit Langote, Tom Lane)
For example, partitionwise joins can now happen between partitioned tables even when their partition bounds do not match exactly.
-
Support row-level
BEFORE
triggers on partitioned tables (Álvaro Herrera)However, such a trigger is not allowed to change which partition is the destination.
-
Allow partitioned tables to be logically replicated via publications (Amit Langote)
Previously, partitions had to be replicated individually. Now a partitioned table can be published explicitly, causing all its partitions to be published automatically. Addition/removal of a partition causes it to be likewise added to or removed from the publication. The
CREATE PUBLICATION
optionpublish_via_partition_root
controls whether changes to partitions are published as their own changes or their parent's. -
Allow logical replication into partitioned tables on subscribers (Amit Langote)
Previously, subscribers could only receive rows into non-partitioned tables.
-
Allow whole-row variables (that is,
table
.*
) to be used in partitioning expressions (Amit Langote)
E.12.3.1.2. Indexes
-
More efficiently store duplicates in B-tree indexes (Anastasia Lubennikova, Peter Geoghegan)
This allows efficient B-tree indexing of low-cardinality columns by storing duplicate keys only once. Users upgrading with pg_upgrade will need to use
REINDEX
to make an existing index use this feature. -
Allow GiST and SP-GiST indexes on
box
columns to supportORDER BY
queries (Nikita Glukhov)box
<->point
-
Allow GIN indexes to more efficiently handle
!
(NOT) clauses intsquery
searches (Nikita Glukhov, Alexander Korotkov, Tom Lane, Julien Rouhaud) -
Allow index operator classes to take parameters (Nikita Glukhov)
-
Allow
CREATE INDEX
to specify the GiST signature length and maximum number of integer ranges (Nikita Glukhov)Indexes created on four and eight-byte integer array , tsvector , pg_trgm , ltree , and hstore columns can now control these GiST index parameters, rather than using the defaults.
-
Prevent indexes that use non-default collations from being added as a table's unique or primary key constraint (Tom Lane)
The index's collation must match that of the underlying column, but
ALTER TABLE
previously failed to check this.
E.12.3.1.3. Optimizer
-
Improve the optimizer's selectivity estimation for containment/match operators (Tom Lane)
-
Allow setting the statistics target for extended statistics (Tomas Vondra)
This is controlled with the new command option
ALTER STATISTICS ... SET STATISTICS
. Previously this was computed based on more general statistics target settings. -
Allow use of multiple extended statistics objects in a single query (Tomas Vondra)
-
Allow use of extended statistics objects for OR clauses and IN /
ANY
constant lists (Pierre Ducroquet, Tomas Vondra) -
Allow functions in
FROM
clauses to be pulled up (inlined) if they evaluate to constants (Alexander Kuzmenkov, Aleksandr Parfenov)
E.12.3.1.4. General Performance
-
Implement incremental sorting (James Coleman, Alexander Korotkov, Tomas Vondra)
If an intermediate query result is known to be sorted by one or more leading keys of a required sort ordering, the additional sorting can be done considering only the remaining keys, if the rows are sorted in batches that have equal leading keys.
If necessary, this can be controlled using enable_incremental_sort .
-
Improve the performance of sorting inet values (Brandur Leach)
-
Allow hash aggregation to use disk storage for large aggregation result sets (Jeff Davis)
Previously, hash aggregation was avoided if it was expected to use more than work_mem memory. Now, a hash aggregation plan can be chosen despite that. The hash table will be spilled to disk if it exceeds
work_mem
times hash_mem_multiplier .This behavior is normally preferable to the old behavior, in which once hash aggregation had been chosen, the hash table would be kept in memory no matter how large it got - which could be very large if the planner had misestimated. If necessary, behavior similar to that can be obtained by increasing
hash_mem_multiplier
. -
Allow inserts, not only updates and deletes, to trigger vacuuming activity in autovacuum (Laurenz Albe, Darafei Praliaskouski)
Previously, insert-only activity would trigger auto-analyze but not auto-vacuum, on the grounds that there could not be any dead tuples to remove. However, a vacuum scan has other useful side-effects such as setting page-all-visible bits, which improves the efficiency of index-only scans. Also, allowing an insert-only table to receive periodic vacuuming helps to spread out the work of " freezing " old tuples, so that there is not suddenly a large amount of freezing work to do when the entire table reaches the anti-wraparound threshold all at once.
If necessary, this behavior can be adjusted with the new parameters autovacuum_vacuum_insert_threshold and autovacuum_vacuum_insert_scale_factor , or the equivalent table storage options.
-
Add maintenance_io_concurrency parameter to control I/O concurrency for maintenance operations (Thomas Munro)
-
Allow WAL writes to be skipped during a transaction that creates or rewrites a relation, if wal_level is
minimal
(Kyotaro Horiguchi)Relations larger than wal_skip_threshold will have their files fsync'ed rather than generating WAL . Previously this was done only for
COPY
operations, but the implementation had a bug that could cause data loss during crash recovery. -
Improve performance when replaying
DROP DATABASE
commands when many tablespaces are in use (Fujii Masao) -
Improve performance for truncation of very large relations (Kirk Jamison)
-
Improve retrieval of the leading bytes of TOAST 'ed values (Binguo Bao, Andrey Borodin)
Previously, compressed out-of-line TOAST values were fully fetched even when it's known that only some leading bytes are needed. Now, only enough data to produce the result is fetched.
-
Improve performance of
LISTEN
/NOTIFY
(Martijn van Oosterhout, Tom Lane) -
Speed up conversions of integers to text (David Fetter)
-
Reduce memory usage for query strings and extension scripts that contain many SQL statements (Amit Langote)
E.12.3.1.5. Monitoring
-
Allow
EXPLAIN
, auto_explain , autovacuum , and pg_stat_statements to track WAL usage statistics (Kirill Bychik, Julien Rouhaud) -
Allow a sample of SQL statements, rather than all statements, to be logged (Adrien Nayrat)
A log_statement_sample_rate fraction of those statements taking more than log_min_duration_sample duration will be logged.
-
Add the backend type to csvlog and optionally log_line_prefix log output (Peter Eisentraut)
-
Improve control of prepared statement parameter logging (Alexey Bashtanov, Álvaro Herrera)
The GUC setting log_parameter_max_length controls the maximum length of parameter values output during logging of non-error statements, while log_parameter_max_length_on_error does the same for logging of statements with errors. Previously, prepared statement parameters were never logged during errors.
-
Allow function call backtraces to be logged after errors (Peter Eisentraut, Álvaro Herrera)
The new parameter backtrace_functions specifies which C functions should generate backtraces on error.
-
Make vacuum buffer counters 64-bits wide to avoid overflow (Álvaro Herrera)
E.12.3.1.6. System Views
-
Add
leader_pid
to pg_stat_activity to report a parallel worker's leader process (Julien Rouhaud) -
Add system view
pg_stat_progress_basebackup
to report the progress of streaming base backups (Fujii Masao) -
Add system view
pg_stat_progress_analyze
to report ANALYZE progress (Álvaro Herrera, Tatsuro Yamada, Vinayak Pokale) -
Add system view
pg_shmem_allocations
to display shared memory usage (Andres Freund, Robert Haas) -
Add system view
pg_stat_slru
to monitor internal SLRU caches (Tomas Vondra) -
Allow track_activity_query_size to be set as high as 1MB (Vyacheslav Makarov)
The previous maximum was 100kB.
E.12.3.1.7. Wait Events
-
Report a wait event while creating a DSM segment with
posix_fallocate()
(Thomas Munro) -
Add wait event VacuumDelay to report on cost-based vacuum delay (Justin Pryzby)
-
Add wait events for WAL archive and recovery pause (Fujii Masao)
The new events are BackupWaitWalArchive and RecoveryPause.
-
Add wait events RecoveryConflictSnapshot and RecoveryConflictTablespace to monitor recovery conflicts (Masahiko Sawada)
-
Improve performance of wait events on BSD -based systems (Thomas Munro)
E.12.3.1.8. Authentication
-
Allow only superusers to view the ssl_passphrase_command setting (Insung Moon)
This was changed as a security precaution.
-
Change the server's default minimum TLS version for encrypted connections from 1.0 to 1.2 (Peter Eisentraut)
This choice can be controlled by ssl_min_protocol_version .
E.12.3.1.9. Server Configuration
-
Tighten rules on which utility commands are allowed in read-only transaction mode (Robert Haas)
This change also increases the number of utility commands that can run in parallel queries.
-
Allow allow_system_table_mods to be changed after server start (Peter Eisentraut)
-
Disallow non-superusers from modifying system tables when allow_system_table_mods is set (Peter Eisentraut)
Previously, if allow_system_table_mods was set at server start, non-superusers could issue
INSERT
/UPDATE
/DELETE
commands on system tables. -
Enable support for Unix-domain sockets on Windows (Peter Eisentraut)
E.12.3.2. Streaming Replication and Recovery
-
Allow streaming replication configuration settings to be changed by reload (Sergei Kornilov)
Previously, a server restart was required to change primary_conninfo and primary_slot_name .
-
Allow WAL receivers to use a temporary replication slot when a permanent one is not specified (Peter Eisentraut, Sergei Kornilov)
This behavior can be enabled using wal_receiver_create_temp_slot .
-
Allow WAL storage for replication slots to be limited by max_slot_wal_keep_size (Kyotaro Horiguchi)
Replication slots that would require exceeding this value are marked invalid.
-
Allow standby promotion to cancel any requested pause (Fujii Masao)
Previously, promotion could not happen while the standby was in paused state.
-
Generate an error if recovery does not reach the specified recovery target (Leif Gunnar Erlandsen, Peter Eisentraut)
Previously, a standby would promote itself upon reaching the end of WAL , even if the target was not reached.
-
Allow control over how much memory is used by logical decoding before it is spilled to disk (Tomas Vondra, Dilip Kumar, Amit Kapila)
This is controlled by logical_decoding_work_mem .
-
Allow recovery to continue even if invalid pages are referenced by WAL (Fujii Masao)
This is enabled using ignore_invalid_pages .
E.12.3.3. Utility Commands
-
Allow
VACUUM
to process a table's indexes in parallel (Masahiko Sawada, Amit Kapila)The new
PARALLEL
option controls this. -
Allow
FETCH FIRST
to useWITH TIES
to return any additional rows that match the last result row (Surafel Temesgen) -
Report planning-time buffer usage in
EXPLAIN
'sBUFFER
output (Julien Rouhaud) -
Make
CREATE TABLE LIKE
propagate aCHECK
constraint'sNO INHERIT
property to the created table (Ildar Musin, Chris Travers) -
When using
LOCK TABLE
on a partitioned table, do not check permissions on the child tables (Amit Langote) -
Allow
OVERRIDING USER VALUE
on inserts into identity columns (Dean Rasheed) -
Add
ALTER TABLE ... DROP EXPRESSION
to allow removing theGENERATED
property from a column (Peter Eisentraut) -
Fix bugs in multi-step
ALTER TABLE
commands (Tom Lane)IF NOT EXISTS
clauses now work as expected, in that derived actions (such as index creation) do not execute if the column already exists. Also, certain cases of combining related actions into oneALTER TABLE
now work when they did not before. -
Add
ALTER VIEW
syntax to rename view columns (Fujii Masao)Renaming view columns was already possible, but one had to write
ALTER TABLE RENAME COLUMN
, which is confusing. -
Add
ALTER TYPE
options to modify a base type's TOAST properties and support functions (Tomas Vondra, Tom Lane) -
Add
CREATE DATABASE
LOCALE
option (Peter Eisentraut)This combines the existing options
LC_COLLATE
andLC_CTYPE
into a single option. -
Allow
DROP DATABASE
to disconnect sessions using the target database, allowing the drop to succeed (Pavel Stehule, Amit Kapila)This is enabled by the
FORCE
option. -
Add structure member
tg_updatedcols
to allow C-language update triggers to know which column(s) were updated (Peter Eisentraut)
E.12.3.4. Data Types
-
Add polymorphic data types for use by functions requiring compatible arguments (Pavel Stehule)
The new data types are
anycompatible
,anycompatiblearray
,anycompatiblenonarray
, andanycompatiblerange
. -
Add SQL data type
xid8
to expose FullTransactionId (Thomas Munro)The existing
xid
data type is only four bytes so it does not provide the transaction epoch. -
Add data type
regcollation
and associated functions, to represent OIDs of collation objects (Julien Rouhaud) -
Use the glibc version in some cases as a collation version identifier (Thomas Munro)
If the glibc version changes, a warning will be issued about possible corruption of collation-dependent indexes.
-
Add support for collation versions on Windows (Thomas Munro)
-
Allow
ROW
expressions to have their members extracted with suffix notation (Tom Lane)For example,
(ROW(4, 5.0)).f1
now returns 4.
E.12.3.5. Functions
-
Add alternate version of
jsonb_set()
with improvedNULL
handling (Andrew Dunstan)The new function,
jsonb_set_lax()
, handles aNULL
new value by either setting the specified key to a JSON null, deleting the key, raising an exception, or returning thejsonb
value unmodified, as requested. -
Add jsonpath .
datetime()
method (Nikita Glukhov, Teodor Sigaev, Oleg Bartunov, Alexander Korotkov)This function allows JSON values to be converted to timestamps, which can then be processed in
jsonpath
expressions. This change also addsjsonpath
functions that support time-zone-aware output. -
Add SQL functions
NORMALIZE
() to normalize Unicode strings, andIS NORMALIZED
to check for normalization (Peter Eisentraut) -
Add
min()
andmax()
aggregates forpg_lsn
(Fabrízio de Royes Mello)These are particularly useful in monitoring queries.
-
Allow Unicode escapes , e.g.,
E'\u
ornnnn
'U&'\
, to specify any character available in the database encoding, even when the database encoding is not UTF -8 (Tom Lane)nnnn
' -
Allow
to_date()
andto_timestamp()
to recognize non-English month/day names (Juan José Santamaría Flecha, Tom Lane)The names recognized are the same as those output by
to_char()
with the same format patterns. -
Add datetime format patterns
FF1
–FF6
to specify input or output of 1 to 6 fractional-second digits (Alexander Korotkov, Nikita Glukhov, Teodor Sigaev, Oleg Bartunov)These patterns can be used by
to_char()
,to_timestamp()
, and jsonpath's .datetime()
. -
Add
SSSSS
datetime format pattern as an SQL -standard alias forSSSS
(Nikita Glukhov, Alexander Korotkov) -
Add function
gen_random_uuid()
to generate version-4 UUIDs (Peter Eisentraut)Previously UUID generation functions were only available in the external modules uuid-ossp and pgcrypto .
-
Add greatest-common-denominator (
gcd
) and least-common-multiple (lcm
) functions (Vik Fearing) -
Improve the performance and accuracy of the
numeric
type's square root (sqrt
) and natural log (ln
) functions (Dean Rasheed) -
Add function
min_scale()
that returns the number of digits to the right of the decimal point that are required to represent anumeric
value with full accuracy (Pavel Stehule) -
Add function
trim_scale()
to reduce the scale of anumeric
value by removing trailing zeros (Pavel Stehule) -
Add commutators of distance operators (Nikita Glukhov)
For example, previously only
point
<->
line
was supported, nowline
<->
point
works too. -
Create
xid8
versions of all transaction ID functions (Thomas Munro)The old
xid
-based functions still exist, for backward compatibility. -
Allow
get_bit()
andset_bit()
to set bits beyond the first 256MB of abytea
value (Movead Li) -
Allow advisory-lock functions to be used in some parallel operations (Tom Lane)
-
Add the ability to remove an object's dependency on an extension (Álvaro Herrera)
The object can be a function, materialized view, index, or trigger. The syntax is
ALTER .. NO DEPENDS ON
.
E.12.3.6. PL/pgSQL
-
Improve performance of simple PL/pgSQL expressions (Tom Lane, Amit Langote)
-
Improve performance of PL/pgSQL functions that use immutable expressions (Konstantin Knizhnik)
E.12.3.7. Client Interfaces
-
Allow libpq clients to require channel binding for encrypted connections (Jeff Davis)
Using the libpq connection parameter
channel_binding
forces the other end of the TLS connection to prove it knows the user's password. This prevents man-in-the-middle attacks. -
Add libpq connection parameters to control the minimum and maximum TLS version allowed for an encrypted connection (Daniel Gustafsson)
The settings are ssl_min_protocol_version and ssl_max_protocol_version . By default, the minimum TLS version is 1.2 (this represents a behavioral change from previous releases).
-
Allow use of passwords to unlock client certificates (Craig Ringer, Andrew Dunstan)
This is enabled by libpq's sslpassword connection parameter.
-
Allow libpq to use DER -encoded client certificates (Craig Ringer, Andrew Dunstan)
-
Fix ecpg 's
EXEC SQL elif
directive to work correctly (Tom Lane)Previously it behaved the same as
endif
followed byifdef
, so that a successful previous branch of the sameif
construct did not prevent expansion of theelif
branch or following branches.
E.12.3.8. Client Applications
E.12.3.8.1. psql
-
Add transaction status (
%x
) to psql 's default prompts (Vik Fearing) -
Allow the secondary psql prompt to be blank but the same width as the primary prompt (Thomas Munro)
This is accomplished by setting
PROMPT2
to%w
. -
Allow psql 's
\g
and\gx
commands to change \pset output options for the duration of that single command (Tom Lane)This feature allows syntax like
\g (expand=on)
, which is equivalent to\gx
. -
Add psql commands to display operator classes and operator families (Sergey Cherkashin, Nikita Glukhov, Alexander Korotkov)
The new commands are
\dAc
,\dAf
,\dAo
, and\dAp
. -
Show table persistence in psql 's
\dt+
and related commands (David Fetter)In verbose mode, the table/index/view shows if the object is permanent, temporary, or unlogged.
-
Improve output of psql 's
\d
for TOAST tables (Justin Pryzby) -
Fix redisplay after psql 's
\e
command (Tom Lane)When exiting the editor, if the query doesn't end with a semicolon or
\g
, the query buffer contents will now be displayed. -
Add
\warn
command to psql (David Fetter)This is like
\echo
except that the text is sent to stderr instead of stdout. -
Add the PostgreSQL home page to command-line
--help
output (Peter Eisentraut)
E.12.3.8.2. pgbench
-
Allow pgbench to partition its " accounts " table (Fabien Coelho)
This allows performance testing of partitioning.
-
Add pgbench command
\aset
, which behaves like\gset
, but for multiple queries (Fabien Coelho) -
Allow pgbench to generate its initial data server-side, rather than client-side (Fabien Coelho)
-
Allow pgbench to show script contents using option
--show-script
(Fabien Coelho)
E.12.3.9. Server Applications
-
Generate backup manifests for base backups, and verify them (Robert Haas)
A new tool pg_verifybackup can verify backups.
-
Have pg_basebackup estimate the total backup size by default (Fujii Masao)
This computation allows
pg_stat_progress_basebackup
to show progress. If that is not needed, it can be disabled by using the--no-estimate-size
option. Previously, this computation happened only if the--progress
option was used. -
Add an option to pg_rewind to configure standbys (Paul Guo, Jimmy Yih, Ashwin Agrawal)
This matches pg_basebackup 's
--write-recovery-conf
option. -
Allow pg_rewind to use the target cluster's restore_command to retrieve needed WAL (Alexey Kondratov)
This is enabled using the
-c
/--restore-target-wal
option. -
Have pg_rewind automatically run crash recovery before rewinding (Paul Guo, Jimmy Yih, Ashwin Agrawal)
This can be disabled by using
--no-ensure-shutdown
. -
Increase the
PREPARE TRANSACTION
-related information reported by pg_waldump (Fujii Masao) -
Add pg_waldump option
--quiet
to suppress non-error output (Andres Freund, Robert Haas) -
Add pg_dump option
--include-foreign-data
to dump data from foreign servers (Luis Carril) -
Allow vacuum commands run by vacuumdb to operate in parallel mode (Masahiko Sawada)
This is enabled with the new
--parallel
option. -
Allow reindexdb to operate in parallel (Julien Rouhaud)
Parallel mode is enabled with the new
--jobs
option. -
Allow dropdb to disconnect sessions using the target database, allowing the drop to succeed (Pavel Stehule)
This is enabled with the
-f
option. -
Remove
--adduser
and--no-adduser
from createuser (Alexander Lakhin)The long-supported preferred options for this are called
--superuser
and--no-superuser
. -
Use the directory of the pg_upgrade program as the default
--new-bindir
setting when running pg_upgrade (Daniel Gustafsson)
E.12.3.10. Documentation
-
Add a glossary to the documentation (Corey Huinker, Jürgen Purtz, Roger Harkavy, Álvaro Herrera)
-
Reformat tables containing function and operator information for better clarity (Tom Lane)
-
Upgrade to use DocBook 4.5 (Peter Eisentraut)
E.12.3.11. Source Code
-
Add support for building on Visual Studio 2019 (Haribabu Kommi)
-
Add build support for MSYS2 (Peter Eisentraut)
-
Add compare_exchange and fetch_add assembly language code for Power PC compilers (Noah Misch)
-
Update Snowball stemmer dictionaries used by full text search (Panagiotis Mavrogiorgos)
This adds Greek stemming and improves Danish and French stemming.
-
Remove support for Windows 2000 (Michael Paquier)
-
Remove support for non- ELF BSD systems (Peter Eisentraut)
-
Remove support for Python versions 2.5.X and earlier (Peter Eisentraut)
-
Remove support for OpenSSL 0.9.8 and 1.0.0 (Michael Paquier)
-
Remove configure options
--disable-float8-byval
and--disable-float4-byval
(Peter Eisentraut)These were needed for compatibility with some version-zero C functions, but those are no longer supported.
-
Pass the query string to planner hook functions (Pascal Legrand, Julien Rouhaud)
-
Add
TRUNCATE
command hook (Yuli Khodorkovskiy) -
Add TLS init hook (Andrew Dunstan)
-
Allow building with no predefined Unix-domain socket directory (Peter Eisentraut)
-
Reduce the probability of SysV resource key collision on Unix platforms (Tom Lane)
-
Use operating system functions to reliably erase memory that contains sensitive information (Peter Eisentraut)
For example, this is used for clearing passwords stored in memory.
-
Add
headerscheck
script to test C header-file compatibility (Tom Lane) -
Implement internal lists as arrays, rather than a chain of cells (Tom Lane)
This improves performance for queries that access many objects.
-
Change the API for
TS_execute()
(Tom Lane, Pavel Borisov)TS_execute
callbacks must now provide ternary (yes/no/maybe) logic. Calculating NOT queries accurately is now the default.
E.12.3.12. Additional Modules
-
Allow extensions to be specified as trusted (Tom Lane)
Such extensions can be installed in a database by users with database-level
CREATE
privileges, even if they are not superusers. This change also removes thepg_pltemplate
system catalog. -
Allow non-superusers to connect to postgres_fdw foreign servers without using a password (Craig Ringer)
Specifically, allow a superuser to set
password_required
to false for a user mapping . Care must still be taken to prevent non-superusers from using superuser credentials to connect to the foreign server. -
Allow postgres_fdw to use certificate authentication (Craig Ringer)
Different users can use different certificates.
-
Allow sepgsql to control access to the
TRUNCATE
command (Yuli Khodorkovskiy) -
Add extension bool_plperl which transforms SQL booleans to/from PL/Perl booleans (Ivan Panchenko)
-
Have pg_stat_statements treat
SELECT ... FOR UPDATE
commands as distinct from those withoutFOR UPDATE
(Andrew Gierth, Vik Fearing) -
Allow pg_stat_statements to optionally track the planning time of statements (Julien Rouhaud, Pascal Legrand, Thomas Munro, Fujii Masao)
Previously only execution time was tracked.
-
Overhaul ltree 's lquery syntax to treat
NOT
(!) more logically (Filip Rembialkowski, Tom Lane, Nikita Glukhov)Also allow non-* queries to use a numeric range ({}) of matches.
-
Add support for binary I/O of ltree , lquery, and ltxtquery types (Nino Floris)
-
Add an option to dict_int to ignore the sign of integers (Jeff Janes)
-
Add adminpack function
pg_file_sync()
to allow fsync'ing a file (Fujii Masao) -
Add pageinspect functions to output
t_infomask
/t_infomask2
values in human-readable format (Craig Ringer, Sawada Masahiko, Michael Paquier) -
Add B-tree index de-duplication processing columns to pageinspect output (Peter Geoghegan)
E.12.4. Acknowledgments
The following individuals (in alphabetical order) have contributed to this release as patch authors, committers, reviewers, testers, or reporters of issues.
Abhijit Menon-Sen |
Adam Lee |
Adam Scott |
Adé Heyward |
Adrien Nayrat |
Ahsan Hadi |
Alastair McKinley |
Aleksandr Parfenov |
Alex Aktsipetrov |
Alex Macy |
Alex Shulgin |
Alexander Korotkov |
Alexander Kukushkin |
Alexander Kuzmenkov |
Alexander Lakhin |
Alexey Bashtanov |
Alexey Kondratov |
Álvaro Herrera |
Amit Kapila |
Amit Khandekar |
Amit Langote |
Amul Sul |
Anastasia Lubennikova |
Andreas Joseph Krogh |
Andreas Karlsson |
Andreas Kunert |
Andreas Seltenreich |
Andrei Zubkov |
Andres Freund |
Andrew Bille |
Andrew Dunstan |
Andrew Gierth |
Andrey Borodin |
Andrey Klychkov |
Andrey Lepikhov |
Anna Akenteva |
Anna Endo |
Anthony Nowocien |
Anton Vlasov |
Antonin Houska |
Ants Aasma |
Arne Roland |
Arnold Müller |
Arseny Sher |
Arthur Nascimento |
Arthur Zakirov |
Ashutosh Bapat |
Ashutosh Sharma |
Ashwin Agrawal |
Asif Rehman |
Asim Praveen |
Atsushi Torikoshi |
Augustinas Jokubauskas |
Austin Drenski |
Basil Bourque |
Beena Emerson |
Ben Cornett |
Benjie Gillam |
Benoît Lobréau |
Bernd Helmle |
Bharath Rupireddy |
Bhargav Kamineni |
Binguo Bao |
Brad DeJong |
Brandur Leach |
Brent Bates |
Brian Williams |
Bruce Momjian |
Cameron Ezell |
Cary Huang |
Chapman Flack |
Charles Offenbacher |
Chen Huajun |
Chenyang Lu |
Chris Bandy |
Chris Travers |
Christoph Berg |
Christophe Courtois |
Corey Huinker |
Craig Ringer |
Cuiping Lin |
Dagfinn Ilmari Mannsåker |
Daniel Fiori |
Daniel Gustafsson |
Daniel Vérité |
Daniel Westermann |
Darafei Praliaskouski |
Daryl Waycott |
Dave Cramer |
David Christensen |
David Fetter |
David G. Johnston |
David Gilman |
David Harper |
David Rowley |
David Steele |
David Zhang |
Davinder Singh |
Dean Rasheed |
Denis Stuchalin |
Dent John |
Didier Gautheron |
Dilip Kumar |
Dmitry Belyavsky |
Dmitry Dolgov |
Dmitry Ivanov |
Dmitry Telpt |
Dmitry Uspenskiy |
Dominik Czarnota |
Dongming Liu |
Ed Morley |
Edmund Horner |
Emre Hasegeli |
Eric Gillum |
Erik Rijkers |
Erwin Brandstetter |
Ethan Waldo |
Etsuro Fujita |
Eugen Konkov |
Euler Taveira |
Fabien Coelho |
Fabrízio de Royes Mello |
Felix Lechner |
Filip Janus |
Filip Rembialkowski |
Frank Gagnepain |
Georgios Kokolatos |
Gilles Darold |
Greg Nancarrow |
Grigory Smolkin |
Guancheng Luo |
Guillaume Lelarge |
Hadi Moshayedi |
Haiying Tang |
Hamid Akhtar |
Hans Buschmann |
Hao Wu |
Haribabu Kommi |
Haruka Takatsuka |
Heath Lord |
Heikki Linnakangas |
Himanshu Upadhyaya |
Hironobu Suzuki |
Hugh McMaster |
Hugh Ranalli |
Hugh Wang |
Ian Barwick |
Ibrar Ahmed |
Ildar Musin |
Insung Moon |
Ireneusz Pluta |
Isaac Morland |
Ivan Kartyshov |
Ivan Panchenko |
Ivan Sergio Borgonovo |
Jaime Casanova |
James Coleman |
James Gray |
James Hunter |
James Inform |
James Lucas |
Jan Mussler |
Jaroslav Sivy |
Jeevan Chalke |
Jeevan Ladhe |
Jeff Davis |
Jeff Janes |
Jehan-Guillaume de Rorthais |
Jeremy Evans |
Jeremy Schneider |
Jeremy Smith |
Jerry Sievers |
Jesper Pedersen |
Jesse Kinkead |
Jesse Zhang |
Jian Zhang |
Jie Zhang |
Jim Nasby |
Jimmy Yih |
Jobin Augustine |
Joe Conway |
John Hsu |
John Naylor |
Jon Jensen |
Jonathan Katz |
Jorge Gustavo Rocha |
Josef Šimánek |
Joseph Nahmias |
Juan José Santamaría Flecha |
Julian Backes |
Julien Rouhaud |
Jürgen Purtz |
Justin King |
Justin Pryzby |
Karl O. Pinc |
Keisuke Kuroda |
Keith Fiske |
Kelly Min |
Ken Tanzer |
Kirill Bychik |
Kirk Jamison |
Konstantin Knizhnik |
Kuntal Ghosh |
Kyle Kingsbury |
Kyotaro Horiguchi |
Lars Kanis |
Laurenz Albe |
Leif Gunnar Erlandsen |
Li Japin |
Liudmila Mantrova |
Lucas Viecelli |
Luis M. Carril |
Lukáš Sobotka |
Maciek Sakrejda |
Magnus Hagander |
Mahadevan Ramachandran |
Mahendra Singh Thalor |
Manuel Rigger |
Marc Munro |
Marcos David |
Marina Polyakova |
Mark Dilger |
Mark Wong |
Marko Tiikkaja |
Markus Winand |
Marti Raudsepp |
Martijn van Oosterhout |
Masahiko Sawada |
Masahiro Ikeda |
Masao Fujii |
Mateusz Guzik |
Matt Jibson |
Matteo Beccati |
Maxence Ahlouche |
Melanie Plageman |
Michael Banck |
Michael Luo |
Michael Meskes |
Michael Paquier |
Michail Nikolaev |
Mike Palmiotto |
Mithun Cy |
Movead Li |
Nathan Bossart |
Nazli Ugur Koyluoglu |
Neha Sharma |
Nicola Contu |
Nicolás Alvarez |
Nikhil Sontakke |
Nikita Glukhov |
Nikolay Shaplov |
Nino Floris |
Noah Misch |
Noriyoshi Shinoda |
Oleg Bartunov |
Oleg Samoilov |
Oleksii Kliukin |
Ondrej Jirman |
Panagiotis Mavrogiorgos |
Pascal Legrand |
Patrick McHardy |
Paul Guo |
Paul Jungwirth |
Paul Ramsey |
Paul Sivash |
Paul Spencer |
Pavan Deolasee |
Pavel Borisov |
Pavel Luzanov |
Pavel Stehule |
Pavel Suderevsky |
Peifeng Qiu |
Pengzhou Tang |
Peter Billen |
Peter Eisentraut |
Peter Geoghegan |
Peter Smith |
Petr Fedorov |
Petr Jelínek |
Phil Bayer |
Philip Semanchuk |
Philippe Beaudoin |
Pierre Ducroquet |
Pierre Giraud |
Piotr Gabriel Kosinski |
Piotr Wlodarczyk |
Prabhat Sahu |
Quan Zongliang |
Quentin Rameau |
Rafael Castro |
Rafia Sabih |
Raj Mohite |
Rajkumar Raghuwanshi |
Ramanarayana M |
Ranier Vilela |
Rares Salcudean |
Raúl Marín Rodríguez |
Raymond Martin |
Reijo Suhonen |
Richard Guo |
Robert Ford |
Robert Haas |
Robert Kahlert |
Robert Treat |
Robin Abbi |
Robins Tharakan |
Roger Harkavy |
Roman Peshkurov |
Rui DeSousa |
Rui Hai Jiang |
Rushabh Lathia |
Ryan Lambert |
Ryohei Takahashi |
Scott Ribe |
Sean Farrell |
Sehrope Sarkuni |
Sergei Agalakov |
Sergei Kornilov |
Sergey Cherkashin |
Shawn Debnath |
Shawn Wang |
Shay Rojansky |
Shenhao Wang |
Simon Riggs |
Slawomir Chodnicki |
Soumyadeep Chakraborty |
Stéphane Lorek |
Stephen Frost |
Steve Rogerson |
Steven Winfield |
Surafel Temesgen |
Suraj Kharage |
Takanori Asaba |
Takao Fujii |
Takayuki Tsunakawa |
Takuma Hoshiai |
Tatsuhito Kasahara |
Tatsuo Ishii |
Tatsuro Yamada |
Taylor Vesely |
Teodor Sigaev |
Tham Nguyen |
Thibaut Madelaine |
Thom Brown |
Thomas Kellerer |
Thomas Munro |
Tiago Anastacio |
Tim Clarke |
Tim Möhlmann |
Tom Ellis |
Tom Gottfried |
Tom Lane |
Tomas Vondra |
Tuomas Leikola |
Tushar Ahuja |
Victor Wagner |
Victor Yegorov |
Vignesh C |
Vik Fearing |
Vinay Banakar |
Vladimir Leskov |
Vladimir Sitnikov |
Vyacheslav Makarov |
Vyacheslav Shablistyy |
Will Leinweber |
William Crowell |
Wyatt Alt |
Yang Xiao |
Yaroslav Schekin |
Yi Huang |
Yigong Hu |
Yoann La Cancellera |
Yoshikazu Imai |
Yu Kimura |
Yugo Nagata |
Yuli Khodorkovskiy |
Yusuke Egashira |
Yuya Watari |
Yuzuko Hosoya |
ZhenHua Cai |