postgresql/contrib
Amit Kapila d65485b02b Fix xmin advancement during fast_forward decoding.
During logical decoding, we advance catalog_xmin of logical too early in
fast_forward mode, resulting in required catalog data being removed by
vacuum. This mode is normally used to advance the slot without processing
the changes, but we still can't let the slot's xmin to advance to an
incorrect value.

Commit f49a80c481 fixed a similar issue where the logical slot's
catalog_xmin was getting advanced prematurely during non-fast-forward
mode. During xl_running_xacts processing, instead of directly advancing
the slot's xmin to the oldest running xid in the record, it allowed the
xmin to be held back for snapshots that can be used for
not-yet-replayed transactions, as those might consider older txns as
running too. However, it missed the fact that the same problem can happen
during fast_forward mode decoding, as we won't build a base snapshot in
that mode, and the future call to get_changes from the same slot can miss
seeing the required catalog changes leading to incorrect reslts.

This commit allows building the base snapshot even in fast_forward mode to
prevent the early advancement of xmin.

Reported-by: Amit Kapila <amit.kapila16@gmail.com>
Author: Zhijie Hou <houzj.fnst@fujitsu.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: shveta malik <shveta.malik@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Backpatch-through: 13
Discussion: https://postgr.es/m/CAA4eK1LqWncUOqKijiafe+Ypt1gQAQRjctKLMY953J79xDBgAg@mail.gmail.com
Discussion: https://postgr.es/m/OS0PR01MB57163087F86621D44D9A72BF94BB2@OS0PR01MB5716.jpnprd01.prod.outlook.com
2025-04-28 11:55:00 +05:30
..
adminpack Read until EOF vice stat-reported size in read_binary_file 2020-07-04 06:28:21 -04:00
amcheck Backport BackgroundPsql perl test module 2024-06-27 19:01:23 +03:00
auth_delay Update copyrights for 2020 2020-01-01 12:21:45 -05:00
auto_explain Fix ancient memory leak in contrib/auto_explain. 2021-02-02 13:49:08 -05:00
bloom Count contrib/bloom index scans in pgstat view. 2024-11-12 20:57:35 -05:00
bool_plperl Fix broken ruleutils support for function TRANSFORM clauses. 2021-01-25 13:03:11 -05:00
btree_gin btree_gin: Fix calculation of leftmost interval value. 2023-10-29 11:14:34 +00:00
btree_gist Fix results of index-only scans on btree_gist char(N) indexes. 2022-01-08 14:54:39 -05:00
citext CREATE INDEX: use the original userid for more ACL checks. 2022-06-25 09:07:45 -07:00
cube Make contrib modules' installation scripts more secure. 2020-08-10 10:44:42 -04:00
dblink Make dblink interruptible, via new libpqsrv APIs. 2025-04-03 09:34:02 -07:00
dict_int Preserve integer and float values accurately in (de)serialize_deflist. 2020-03-10 12:30:02 -04:00
dict_xsyn Remove support for upgrading extensions from "unpackaged" state. 2020-02-19 16:59:14 -05:00
earthdistance Make contrib modules' installation scripts more secure. 2020-08-10 10:44:42 -04:00
file_fdw Remove leftover comments, left behind by removal of WITH OIDS. 2020-11-30 10:29:18 +02:00
fuzzystrmatch Ensure Soundex difference() function handles empty input sanely. 2023-05-16 10:53:42 -04:00
hstore hstore: Tighten key/value parsing check for whitespaces 2023-06-12 09:14:17 +09:00
hstore_plperl Make contrib modules' installation scripts more secure. 2020-08-10 10:44:42 -04:00
hstore_plpython In hstore_plpython, avoid crashing when return value isn't a mapping. 2023-04-27 11:55:06 -04:00
intagg Make contrib modules' installation scripts more secure. 2020-08-10 10:44:42 -04:00
intarray Fix GIN's shimTriConsistentFn to not corrupt its input. 2025-04-12 12:27:46 -04:00
isn Remove support for upgrading extensions from "unpackaged" state. 2020-02-19 16:59:14 -05:00
jsonb_plperl Mark some contrib modules as "trusted". 2020-02-13 15:02:35 -05:00
jsonb_plpython In jsonb_plpython.c, suppress warning message from gcc 10. 2020-01-30 18:26:12 -05:00
lo Repair incorrect handling of AfterTriggerSharedData.ats_modifiedcols. 2025-01-22 11:58:20 -05:00
ltree Validate ltree siglen GiST option to be int-aligned 2023-04-23 14:00:16 +03:00
ltree_plpython Improve error messages in ltree_in and lquery_in. 2020-03-31 11:14:42 -04:00
oid2name Report the true database name on connection errors 2021-01-26 16:42:13 -03:00
pageinspect Be more wary of corrupt data in pageinspect's heap_page_items(). 2025-04-19 16:37:43 -04:00
passwordcheck Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pg_buffercache Remove support for upgrading extensions from "unpackaged" state. 2020-02-19 16:59:14 -05:00
pg_freespacemap Prevent assertion failure in contrib/pg_freespacemap. 2025-03-27 13:20:23 -04:00
pg_prewarm Replace RelationOpenSmgr() with RelationGetSmgr(). 2022-11-17 16:54:30 -05:00
pg_standby pg_standby: Don't use HAVE_WORKING_LINK 2020-03-03 08:54:44 +01:00
pg_stat_statements pg_stat_statements: fetch stmt location/length before it disappears. 2022-11-01 12:48:01 -04:00
pg_trgm Fix arrays comparison in CompareOpclassOptions() 2024-11-12 01:54:38 +02:00
pg_visibility Restore smgrtruncate() prototype in back-branches. 2025-01-08 10:48:57 +13:00
pgcrypto pgcrypto: Fix check for buffer size 2024-01-30 11:15:46 +01:00
pgrowlocks Adjust the order of the prechecks in pgrowlocks() 2023-10-31 16:44:00 +13:00
pgstattuple Reintroduce support for sequences in pgstattuple and pageinspect. 2024-09-12 16:31:29 -05:00
postgres_fdw Restrict accesses to non-system views and foreign tables during pg_dump. 2024-08-05 06:05:20 -07:00
seg Replace last PushOverrideSearchPath() call with set_config_option(). 2023-05-08 06:14:12 -07:00
sepgsql Adjust sepgsql expected output for 681d9e462 et al. 2023-05-08 11:24:47 -04:00
spi Remove support for upgrading extensions from "unpackaged" state. 2020-02-19 16:59:14 -05:00
sslinfo Remove support for upgrading extensions from "unpackaged" state. 2020-02-19 16:59:14 -05:00
start-scripts Remove contrib/start-scripts/osx/. 2017-11-17 12:53:20 -05:00
tablefunc Remove support for upgrading extensions from "unpackaged" state. 2020-02-19 16:59:14 -05:00
tcn Mark some contrib modules as "trusted". 2020-02-13 15:02:35 -05:00
test_decoding Fix xmin advancement during fast_forward decoding. 2025-04-28 11:55:00 +05:30
tsm_system_rows Mark some contrib modules as "trusted". 2020-02-13 15:02:35 -05:00
tsm_system_time Mark some contrib modules as "trusted". 2020-02-13 15:02:35 -05:00
unaccent unaccent: Tweak value of PYTHON when building without Python support 2023-09-27 14:41:26 +09:00
uuid-ossp Reject bogus output from uuid_create(3). 2022-09-09 12:41:36 -04:00
vacuumlo Report the true database name on connection errors 2021-01-26 16:42:13 -03:00
xml2 Replace usages of xmlXPathCompile() with xmlXPathCtxtCompile(). 2024-09-15 13:33:09 -04:00
contrib-global.mk Respect TEMP_CONFIG when pg_regress_check and friends are called 2016-02-27 12:28:21 -05:00
Makefile Create contrib/bool_plperl to provide a bool transform for PL/Perl[U]. 2020-03-06 17:11:23 -05:00
README Rename 'gmake' to 'make' in docs and recommended commands 2014-02-12 17:29:19 -05:00

The PostgreSQL contrib tree
---------------------------

This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree.  This does not preclude their
usefulness.

User documentation for each module appears in the main SGML
documentation.

When building from the source distribution, these modules are not
built automatically, unless you build the "world" target.  You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.

Some directories supply new user-defined functions, operators, or
types.  To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command.  In a fresh database,
you can simply do

    CREATE EXTENSION module_name;

See the PostgreSQL documentation for more information about this
procedure.