postgres

Commit Graph

Author	SHA1	Message	Date
Noah Misch	334e508e17	Doc: stop implying recommendation of insecure search_path value. SQL "SET search_path = 'pg_catalog, pg_temp'" is silently equivalent to "SET search_path = pg_temp, pg_catalog, "pg_catalog, pg_temp"" instead of the intended "SET search_path = pg_catalog, pg_temp". (The intent was a two-element search path. With the single quotes, it instead specifies one element with a comma and a space in the middle of the element.) In addition to the SET statement, this affects SET clauses of CREATE FUNCTION, ALTER ROLE, and ALTER DATABASE. It does not affect the set_config() SQL function. Though the documentation did not show an insecure command, remove single quotes that could entice a reader to write an insecure command. Back-patch to v13 (all supported versions). Reported-by: Sven Klemm <sven@timescale.com> Author: Sven Klemm <sven@timescale.com> Backpatch-through: 13	4 months ago
Dean Rasheed	e14df1015e	doc: Warn that ts_headline() output is not HTML-safe. Add a documentation warning to ts_headline() pointing out that, when working with untrusted input documents, the output is not guaranteed to be safe for direct inclusion in web pages. This is because, while it does remove some XML tags from the input, it doesn't remove all HTML markup, and so the result may be unsafe (e.g., it might permit XSS attacks). To guard against that, all HTML markup should be removed from the input, making it plain text, or the output should be passed through an HTML sanitizer. In addition, document precisely what the default text search parser recognises as valid XML tags, since that's what determines which XML tags ts_headline() will remove. Reported-by: Richard Neill <richard.neill@telos.digital> Author: Dean Rasheed <dean.a.rasheed@gmail.com> Reviewed-by: Noah Misch <noah@leadboat.com> Backpatch-through: 13	4 months ago
Tom Lane	e076120d99	Update time zone data files to tzdata release 2025b. DST law changes in Chile: there is a new time zone America/Coyhaique for Chile's Aysén Region, to account for it changing to UTC-03 year-round and thus diverging from America/Santiago. Historical corrections for Iran. Backpatch-through: 13	4 months ago
Amit Kapila	21a7caeeb9	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	5 months ago
Amit Kapila	9987c94662	Fix typo in test file name added in commit `4909b38af0`. Author: Shlok Kyal <shlok.kyal.oss@gmail.com> Backpatch-through: 13 Discussion: https://postgr.es/m/CANhcyEXsObdjkjxEnq10aJumDpa5J6aiPzgTh_w4KCWRYHLw6Q@mail.gmail.com	5 months ago
Tom Lane	f45bdb1339	Avoid possibly-theoretical OOM crash hazard in hash_create(). One place in hash_create() used DynaHashAlloc() as a convenient shorthand for MemoryContextAlloc(). That was fine when it was written, but it stopped being fine when `9c911ec06` changed DynaHashAlloc() to use MCXT_ALLOC_NO_OOM (mea culpa). Change the code to call plain MemoryContextAlloc() as intended. I think that this bug may be unreachable in practice, since we now always create AllocSets with some space already allocated, so that an OOM failure here for a non-shared hash table should be impossible (with a hash table name of reasonable length anyway). And there aren't enough shared hash tables to make a crash for one of those probable. Nonetheless it's clearly not operating as designed, so back-patch to v16 where `9c911ec06` came in. Reported-by: Maksim Korotkov <m.korotkov@postgrespro.ru> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/219bdccd460510efaccf90b57e5e5ef2@postgrespro.ru Backpatch-through: 16	5 months ago
Amit Kapila	0de091a4b5	Fix an oversight in `3f28b2fcac`. Commit `3f28b2fcac` tried to ensure that the replication origin shouldn't be advanced in case of an ERROR in the apply worker, so that it can request the same data again after restart. However, it is possible that an ERROR was caught and handled by a (say PL/pgSQL) function, and the apply worker continues to apply further changes, in which case, we shouldn't reset the replication origin. Ensure to reset the origin only when the apply worker exits after an ERROR. Commit `3f28b2fcac` added new function geterrlevel, which we removed in HEAD as part of this commit, but kept it in backbranches to avoid breaking any applications. A separate case can be made to have such a function even for HEAD. Reported-by: Shawn McCoy <shawn.the.mccoy@gmail.com> Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: vignesh C <vignesh21@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 16, where it was introduced Discussion: https://postgr.es/m/CALsgZNCGARa2mcYNVTSj9uoPcJo-tPuWUGECReKpNgTpo31_Pw@mail.gmail.com	5 months ago
Michael Paquier	e9ab8677bf	Remove assertion based on pending_since in pgstat_report_stat() This assertion, based on pending_since (timestamp used to prevent stats reports to be too frequent or should a partial flush happen), is reached when it is found that no data can be flushed but a previous call of pgstat_report_stat() determined that some stats data has been found as in need of a flush. So pending_since is set when some stats data is pending (in non-force mode) or if report attempts are too frequent, and reset to 0 once all stats have been flushed. Since `5cbbe70a9c`, WAL senders have begun to report their stats on a periodic basis for IO stats in v16~ and backend stats on HEAD, creating some friction with the concurrent pgstat_report_stat() calls that can happen in the context of a WAL sender (shutdown callback doing a final report or backend-related code paths). This problem is the cause of spurious failures in the TAP tests. In theory, this assertion can be also reached in v15, even if that's very unlikely. For example, a process, say a background worker, could do periodic and direct stats flushes with concurrent calls of pgstat_report_stat() that could cause conflicting values of pending_since. This can be done with WAL or SLRU stats flushes using pgstat_flush_wal() or pgstat_slru_flush(). HEAD makes this situation easier to happen with custom cumulative stats. This commit removes the assertion altogether, per discussion, as it is more useful to keep the state of things as they are for the WAL sender. The assertion could use a special state based on for example am_walsender, but I doubt that this would be meaningful in the long run based on the other arguments raised while discussing this issue. Reported-by: Tom Lane <tgl@sss.pgh.pa.us> Reported-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/1489124.1744685908@sss.pgh.pa.us Discussion: https://postgr.es/m/dwrkeszz6czvtkxzr5mqlciy652zau5qqnm3cp5f3p2po74ppk@omg4g3cc6dgq Backpatch-through: 15	5 months ago
David Rowley	d2b065084a	Doc: reword text explaining the --maintenance-db option The previous text was a little clumsy. Here we improve that. Author: David Rowley <dgrowleyml@gmail.com> Reported-by: Noboru Saito <noborusai@gmail.com> Reviewed-by: David G. Johnston <david.g.johnston@gmail.com> Discussion: https://postgr.es/m/CAAM3qnJtv5YbjpwDfVOYN2gZ9zGSLFM1UGJgptSXmwfifOZJFQ@mail.gmail.com Backpatch-through: 13	5 months ago
Noah Misch	4664de1826	Test restartpoints in archive recovery. v14 commit `1f95181b44` and its v13 equivalent caused timing-dependent failures in archive recovery, at restartpoints. The symptom was "invalid magic number 0000 in log segment X, offset 0", "unexpected pageaddr X in log segment Y, offset 0" [X < Y], or an assertion failure. Commit `3635a0a35a` and predecessors back-patched v15 changes to fix that. This test reproduces the problem probabilistically, typically in less than 1000 iterations of the test. Hence, buildfarm and CI runs would have surfaced enough failures to get attention within a day. Reported-by: Arun Thirupathi <arunth@google.com> Discussion: https://postgr.es/m/20250306193013.36.nmisch@google.com Backpatch-through: 13	5 months ago
Noah Misch	5905e99359	Avoid ERROR at ON COMMIT DELETE ROWS after relhassubclass=f. Commit `7102070329` fixed a similar bug, but it missed the case of database-wide ANALYZE ("use_own_xacts" mode). Commit `a07e03fd8f` changed consequences from silent discard of a pg_class stats (relpages et al.) update to ERROR "tuple to be updated was already modified". Losing a relpages update of an ON COMMIT DELETE ROWS table was negligible, but a COMMIT-time error isn't negligible. Back-patch to v13 (all supported versions). Reported-by: Richard Guo <guofenglinux@gmail.com Reported-by: Robins Tharakan <tharakan@gmail.com> Discussion: https://postgr.es/m/CAMbWs4-XwMKMKJ_GT=p3_-_=j9rQSEs1FbDFUnW9zHuKPsPNEQ@mail.gmail.com Backpatch-through: 13	5 months ago
David Rowley	887a232371	Fix issue with ORDER BY / DISTINCT aggregates and FILTER `1349d2790` added support so that aggregate functions with an ORDER BY or DISTINCT clause could make use of presorted inputs to avoid an implicit sort within nodeAgg.c. That commit failed to consider that a FILTER clause may exist that filters rows before the aggregate function arguments are evaluated. That can be problematic if an aggregate argument contains an expression which could error out during evaluation. It's perfectly valid to want to have a FILTER clause which eliminates such values, and with the pre-sorted path added in `1349d2790`, it was possible that the planner would produce a plan with a Sort node above the Aggregate to perform the sort on the aggregate's arguments long before the Aggregate node would filter out the non-matching values. Here we fix this by inspecting ORDER BY / DISTINCT aggregate functions which have a FILTER clause to see if the aggregate's arguments are anything more complex than a Var or a Const. Evaluating these isn't going to cause an error. If we find any non-Var, non-Const parameters then the planner will now opt to perform the sort in the Aggregate node for these aggregates, i.e. disable the presorted aggregate optimization. An alternative fix would have been to completely disallow the presorted optimization for Aggrefs with any FILTER clause, but that wasn't done as that could cause large performance regressions for queries that see significant gains from `1349d2790` due to presorted results coming in from an Index Scan. Backpatch to 16, where `1349d2790` was introduced Author: David Rowley <dgrowleyml@gmail.com> Reported-by: Kaimeh <kkaimeh@gmail.com> Diagnosed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAK-%2BJz9J%3DQ06-M7cDJoPNeYbz5EZDqkjQbJnmRyQyzkbRGsYkA%40mail.gmail.com Backpatch-through: 16	5 months ago
Tom Lane	2d33cf7b8b	Be more wary of corrupt data in pageinspect's heap_page_items(). The original intent in heap_page_items() was to return nulls, not throw an error or crash, if an item was sufficiently corrupt that we couldn't safely extract data from it. However, commit `d6061f83a` utterly missed that memo, and not only put in an un-length-checked copy of the tuple's data section, but also managed to break the check on sane nulls-bitmap length. Either mistake could possibly lead to a SIGSEGV crash if the tuple is corrupt. Bug: #18896 Reported-by: Dmitry Kovalenko <d.kovalenko@postgrespro.ru> Author: Dmitry Kovalenko <d.kovalenko@postgrespro.ru> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18896-add267b8e06663e3@postgresql.org Backpatch-through: 13	5 months ago
Tom Lane	a25f21d99a	Fix pg_dump --clean with partitioned indexes. We'd try to drop the partitions of a partitioned index separately, which is disallowed by the backend, leading to an error during restore. While the error is harmless, it causes problems if you try to use --single-transaction mode. Fortunately, there seems no need to do a DROP at all, since the partition will go away silently when we drop either the parent index or the partition's table. So just make the DROP conditional on not being a partition. Reported-by: jian he <jian.universality@gmail.com> Author: jian he <jian.universality@gmail.com> Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CACJufxF0QSdkjFKF4di-JGWN6CSdQYEAhGPmQJJCdkSZtd=oLg@mail.gmail.com Backpatch-through: 13	5 months ago
Tom Lane	f04e0faa37	Fix failure for generated column with a not-null domain constraint. If a GENERATED column is declared to have a domain data type where the domain's constraints disallow null values, INSERT commands failed because we built a targetlist that included coercing a null constant to the domain's type. The failure occurred even when the generated value would have been perfectly OK. This is adjacent to the issues fixed in `0da39aa76`, but we didn't notice for lack of testing a domain with such a constraint. We aren't going to use the result of the targetlist entry for the generated column --- ExecComputeStoredGenerated will overwrite it. So it's not really necessary that it have the exact datatype of the generated column. This patch fixes the problem by changing the targetlist entry to be a null Const of the domain's base type, which should be sufficiently legal. (We do have to tweak ExecCheckPlanOutput to accept the situation, though.) This has been broken since we implemented generated columns. However, this patch only applies easily as far back as v14, partly because I (tgl) only carried `0da39aa76` back that far, but mostly because v14 significantly refactored the handling of INSERT/UPDATE targetlists. Given the lack of field complaints and the short remaining support lifetime of v13, I judge the cost-benefit ratio not good for devising a version that would work in v13. Reported-by: jian he <jian.universality@gmail.com> Author: jian he <jian.universality@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CACJufxG59tip2+9h=rEv-ykOFjt0cbsPVchhi0RTij8bABBA0Q@mail.gmail.com Backpatch-through: 14	5 months ago
Tom Lane	4b65b085af	Fix GIN's shimTriConsistentFn to not corrupt its input. Commit `0f21db36d` made an assumption that GIN triConsistentFns would not modify their input entryRes[] arrays. But in fact, the "shim" triConsistentFn that we use for opclasses that don't supply their own did exactly that, potentially leading to wrong answers from a GIN index search. Through bad luck, none of the test cases that we have for such opclasses exposed the bug. One response to this could be that the assumption of consistency check functions not modifying entryRes[] arrays is a bad one, but it still seems reasonable to me. Notably, shimTriConsistentFn is itself assuming that with respect to the underlying boolean consistentFn, so it's sure being self-centered in supposing that it gets to do so. Fortunately, it's quite simple to fix shimTriConsistentFn to restore the entry-time state of entryRes[], so let's do that instead. This issue doesn't affect any core GIN opclasses, since they all supply their own triConsistentFns. It does affect contrib modules btree_gin, hstore, and intarray. Along the way, I (tgl) noticed that shimTriConsistentFn failed to pick up on a "recheck" flag returned by its first call to the boolean consistentFn. This may be only a latent problem, since it would be unlikely for a consistentFn to set recheck for the all-false case and not any other cases. (Indeed, none of our contrib modules do that.) Nonetheless, it's formally wrong. Reported-by: Vinod Sridharan <vsridh90@gmail.com> Author: Vinod Sridharan <vsridh90@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAFMdLD7XzsXfi1+DpTqTgrD8XU0i2C99KuF=5VHLWjx4C1pkcg@mail.gmail.com Backpatch-through: 13	5 months ago
Michael Paquier	c922ae2c42	Fix race with synchronous_standby_names at startup synchronous_standby_names cannot be reloaded safely by backends, and the checkpointer is in charge of updating a state in shared memory if the GUC is enabled in WalSndCtl, to let the backends know if they should wait or not for a given LSN. This provides a strict control on the timing of the waiting queues if the GUC is enabled or disabled, then reloaded. The checkpointer is also in charge of waking up the backends that could be waiting for a LSN when the GUC is disabled. This logic had a race condition at startup, where it would be possible for backends to not wait for a LSN even if synchronous_standby_names is enabled. This would cause visibility issues with transactions that we should be waiting for but they were not. The problem lasts until the checkpointer does its initial update of the shared memory state when it loads synchronous_standby_names. In order to take care of this problem, the shared memory state in WalSndCtl is extended to detect if it has been initialized by the checkpointer, and not only check if synchronous_standby_names is defined. In WalSndCtlData, sync_standbys_defined is renamed to sync_standbys_status, a bits8 able to know about two states: - If the shared memory state has been initialized. This flag is set by the checkpointer at startup once, and never removed. - If synchronous_standby_names is known as defined in the shared memory state. This is the same as the previous sync_standbys_defined in WalSndCtl. This method gives a way for backends to decide what they should do until the shared memory area is initialized, and they now ultimately fall back to a check on the GUC value in this case, which is the best thing that can be done. Fortunately, SyncRepUpdateSyncStandbysDefined() is called immediately by the checkpointer when this process starts, so the window is very narrow. It is possible to enlarge the problematic window by making the checkpointer wait at the beginning of SyncRepUpdateSyncStandbysDefined() with a hardcoded sleep for example, and doing so has showed that a 2PC visibility test is indeed failing. On machines slow enough, this bug would cause spurious failures. In 17~, we have looked at the possibility of adding an injection point to have a reproducible test, but as the problematic window happens at early startup, we would need to invent a way to make an injection point optionally persistent across restarts when attached, something that would be fine for this case as it would involve the checkpointer. This issue is quite old, and can be reproduced on all the stable branches. Author: Melnikov Maksim <m.melnikov@postgrespro.ru> Co-authored-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/163fcbec-900b-4b07-beaa-d2ead8634bec@postgrespro.ru Backpatch-through: 13	5 months ago
Tom Lane	047495f1a8	Doc: remove long-obsolete advice about generated constraint names. It's been twenty years since we generated constraint names that look like "$N". So this advice about double-quoting such names is well past its sell-by date, and now it merely seems confusing. Reported-by: Yaroslav Saburov <y.saburov@gmail.com> Author: "David G. Johnston" <david.g.johnston@gmail.com> Discussion: https://postgr.es/m/174393459040.678.17810152410419444783@wrigleys.postgresql.org Backpatch-through: 13	5 months ago
Amit Kapila	9a2f8b4f01	Fix data loss in logical replication. Data loss can happen when the DDLs like ALTER PUBLICATION ... ADD TABLE ... or ALTER TYPE ... that don't take a strong lock on table happens concurrently to DMLs on the tables involved in the DDL. This happens because logical decoding doesn't distribute invalidations to concurrent transactions and those transactions use stale cache data to decode the changes. The problem becomes bigger because we keep using the stale cache even after those in-progress transactions are finished and skip the changes required to be sent to the client. This commit fixes the issue by distributing invalidation messages from catalog-modifying transactions to all concurrent in-progress transactions. This allows the necessary rebuild of the catalog cache when decoding new changes after concurrent DDL. We observed performance regression primarily during frequent execution of publication DDL statements that modify the published tables. The regression is minor or nearly nonexistent for DDLs that do not affect the published tables or occur infrequently, making this a worthwhile cost to resolve a longstanding data loss issue. An alternative approach considered was to take a strong lock on each affected table during publication modification. However, this would only address issues related to publication DDLs (but not the ALTER TYPE ...) and require locking every relation in the database for publications created as FOR ALL TABLES, which is impractical. The bug exists in all supported branches, but we are backpatching till 14. The fix for 13 requires somewhat bigger changes than this fix, so the fix for that branch is still under discussion. Reported-by: hubert depesz lubaczewski <depesz@depesz.com> Reported-by: Tomas Vondra <tomas.vondra@enterprisedb.com> Author: Shlok Kyal <shlok.kyal.oss@gmail.com> Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Zhijie Hou <houzj.fnst@fujitsu.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Tested-by: Benoit Lobréau <benoit.lobreau@dalibo.com> Backpatch-through: 14 Discussion: https://postgr.es/m/de52b282-1166-1180-45a2-8d8917ca74c6@enterprisedb.com Discussion: https://postgr.es/m/CAD21AoAenVqiMjpN-PvGHL1N9DWnHSq673bfgr6phmBUzx=kLQ@mail.gmail.com	5 months ago
Amit Kapila	86392e8827	Stabilize 035_standby_logical_decoding.pl. Some tests try to invalidate logical slots on the standby server by running VACUUM on the primary. The problem is that xl_running_xacts was getting generated and replayed before the VACUUM command, leading to the advancement of the active slot's catalog_xmin. Due to this, active slots were not getting invalidated, leading to test failures. We fix it by skipping the generation of xl_running_xacts for the required tests with the help of injection points. As the required interface for injection points was not present in back branches, we fixed the failing tests in them by disallowing the slot to become active for the required cases (where rows_removed conflict could be generated). Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 16, where it was introduced Discussion: https://postgr.es/m/Z6oQXc8LmiTLfwLA@ip-10-97-1-34.eu-west-3.compute.internal	5 months ago
Michael Paquier	e2a82cd23a	Flush the IO statistics of active WAL senders more frequently WAL senders do not flush their statistics until they exit, limiting the monitoring possible for live processes. This is penalizing when WAL senders are running for a long time, like in streaming or logical replication setups, because it is not possible to know the amount of IO they generate while running. This commit makes WAL senders more aggressive with their statistics flush, using an internal of 1 second, with the flush timing calculated based on the existing GetCurrentTimestamp() done before the sleeps done to wait for some activity. Note that the sleep done for logical and physical WAL senders happens in two different code paths, so the stats flushes need to happen in these two places. One test is added for the physical WAL sender case, and one for the logical WAL sender case. This can be done in a stable fashion by relying on the WAL generated by the TAP tests in combination with a stats reset while a server is running, but only on HEAD as WAL data has been added to pg_stat_io in `a051e71e28`. This issue exists since `a9c70b46db` and the introduction of pg_stat_io, so backpatch down to v16. Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com> Reviewed-by: vignesh C <vignesh21@gmail.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Discussion: https://postgr.es/m/Z73IsKBceoVd4t55@ip-10-97-1-34.eu-west-3.compute.internal Backpatch-through: 16	5 months ago
Daniel Gustafsson	00f0bb4eab	doc: Clarify project naming Clarify the project naming in the history section of the docs to match the recent license preamble changes. Backpatch to all supported versions. Author: Dave Page <dpage@pgadmin.org> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/CA+OCxozLzK2+Jc14XZyWXSp6L9Ot+3efwXUE35FJG=fsbib2EA@mail.gmail.com Backpatch-through: 13	5 months ago
Jeff Davis	57467ec7b3	Fix unintentional 'NULL' string literal in pg_upgrade. Introduced in `2a083ab807`. Note: backport of commit `945126234b`, which was missed at the time. Discussion: https://postgr.es/m/e852442da35b4f31acc600ed98bbee0f12e65e0c.camel@j-davis.com Reviewed-by: Michael Paquier <michael@paquier.xyz> Backpatch-through: 16	5 months ago
Tom Lane	1980ec2bc9	Fix parse_cte.c's failure to examine sub-WITHs in DML statements. makeDependencyGraphWalker thought that only SelectStmt nodes could contain a WithClause. Which was true in our original implementation of WITH, but astonishingly we missed updating this code when we added the ability to attach WITH to INSERT/UPDATE/DELETE (and later MERGE). Moreover, since it was coded to deliberately block recursion to a WithClause, even updating raw_expression_tree_walker didn't save it. The upshot of this was that we didn't see references to outer CTE names appearing within an inner WITH, and would neither complain about disallowed recursion nor account for such references when sorting CTEs into a usable order. The lack of complaints about this is perhaps not so surprising, because typical usage of WITH wouldn't hit either case. Still, it's pretty broken; failing to detect recursion here leads to assert failures or worse later on. Fix by factoring out the processing of sub-WITHs into a new function WalkInnerWith, and invoking that for all the statement types that can have WITH. Bug: #18878 Reported-by: Yu Liang <luy70@psu.edu> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18878-a26fa5ab6be2f2cf@postgresql.org Backpatch-through: 13	5 months ago
Tom Lane	ca54f9b706	Avoid double transformation of json_array()'s subquery. transformJsonArrayQueryConstructor() applied transformStmt() to the same subquery tree twice. While this causes no issue in many cases, there are some where it causes a coredump, thanks to the parser's habit of scribbling on its input. Fix by making a copy before the first transformation (compare `0f43083d1`). This is quite brute-force, but then so is the whole business of transforming the input twice. Per discussion in the bug thread, this implementation of json_array() parsing should be replaced completely. But that will take some work and will surely not be back-patchable, so for the moment let's take the easy way out. Oversight in `7081ac46a`. Back-patch to v16 where that came in. Bug: #18877 Reported-by: Yu Liang <luy70@psu.edu> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18877-c3c3ad75845833bb@postgresql.org Backpatch-through: 16	5 months ago
Tom Lane	fb3a77fd9d	Repair misbehavior with duplicate entries in FK SET column lists. Since v15 we've had an option to apply a foreign key constraint's ON DELETE SET DEFAULT or SET NULL action to just some of the referencing columns. There was not a check for duplicate entries in the list of columns-to-set, though. That caused a potential memory stomp in CreateConstraintEntry(), which incautiously assumed that the list of columns-to-set couldn't be longer than the number of key columns. Even after fixing that, the case doesn't work because you get an error like "multiple assignments to same column" from the SQL command that is generated to do the update. We could either raise an error for duplicate columns or silently suppress the dups, and after a bit of thought I chose to do the latter. This is motivated by the fact that duplicates in the FK column list are legal, so it's not real clear why duplicates in the columns-to-set list shouldn't be. Of course there's no need to actually set the column more than once. I left in the fix in CreateConstraintEntry() too, just because it didn't seem like such low-level code ought to be making assumptions about what it's handed. Bug: #18879 Reported-by: Yu Liang <luy70@psu.edu> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18879-259fc59d072bd4d7@postgresql.org Backpatch-through: 15	5 months ago
Heikki Linnakangas	4193213988	Relax assertion in finding correct GiST parent Commit `28d3c2ddcf` introduced an assertion that if the memorized downlink location in the insertion stack isn't valid, the parent's LSN should've changed too. Turns out that was too strict. In gistFindCorrectParent(), if we walk right, we update the parent's block number and clear its memorized 'downlinkoffnum'. That triggered the assertion on next call to gistFindCorrectParent(), if the parent needed to be split too. Relax the assertion, so that it's OK if downlinkOffnum is InvalidOffsetNumber. Backpatch to v13-, all supported versions. The assertion was added in commit `28d3c2ddcf` in v12. Reported-by: Alexander Lakhin <exclusion@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://www.postgresql.org/message-id/18396-03cac9beb2f7aac3@postgresql.org	5 months ago
Daniel Gustafsson	dda1b06035	doc: Clarify the system value for sslrootcert The documentation for the special value "system" for sslrootcert could be misinterpreted to mean the default operating system CA store, which it may be, but it's defined to be the default CA store of the SSL lib used. Backpatch down to v16 where support for the system value was added. Author: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: George MacKerron <george@mackerron.co.uk> Discussion: https://postgr.es/m/B3CBBAA3-6EA3-4AB7-8619-4BBFAB93DDB4@yesql.se Backpatch-through: 16	5 months ago
Fujii Masao	65e9418abe	Fix logical decoding test to correctly check slot removal on standby. The regression test for logical decoding verifies whether a logical slot is correctly dropped on a standby when its associated database is dropped. However, the test mistakenly retrieved slot information from the primary instead of the standby, causing incorrect behavior. This commit fixes the issue by ensuring the test correctly checks the slot on the standby. Back-patch to all supported versions. Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/1fdfd020-a509-403c-bd8f-a04664aba148@oss.nttdata.com Backpatch-through: 13	5 months ago
Fujii Masao	bc485fce52	Fix logical decoding regression tests to correctly check slot existence. The regression tests for logical decoding verify whether a logical slot exists or has been dropped. Previously, these tests attempted to retrieve "slot_name" from the result of slot(), but since "slot_name" was not included in the result, slot()->{'slot_name'} always returned undef, leading to incorrect behavior. This commit fixes the issue by checking the "plugin" field in the result of slot() instead, ensuring the tests properly verify slot existence. Back-patch to all supported versions. Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/OSCPR01MB149667EC4E738769CA80B7EA5F5AE2@OSCPR01MB14966.jpnprd01.prod.outlook.com Backpatch-through: 13	5 months ago
Masahiko Sawada	87e8599e04	Restrict copying of invalidated replication slots. Previously, invalidated logical and physical replication slots could be copied using the pg_copy_logical_replication_slot and pg_copy_physical_replication_slot functions. Replication slots that were invalidated for reasons other than WAL removal retained their restart_lsn. This meant that a new slot copied from an invalidated slot could have a restart_lsn pointing to a WAL segment that might have already been removed. This commit restricts the copying of invalidated replication slots. Backpatch to v16, where slots could retain their restart_lsn when invalidated for reasons other than WAL removal. For v15 and earlier, this check is not required since slots can only be invalidated due to WAL removal, and existing checks already handle this issue. Author: Shlok Kyal <shlok.kyal.oss@gmail.com> Reviewed-by: vignesh C <vignesh21@gmail.com> Reviewed-by: Zhijie Hou <houzj.fnst@fujitsu.com> Reviewed-by: Peter Smith <smithpb2250@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Discussion: https://postgr.es/m/CANhcyEU65aH0VYnLiu%3DOhNNxhnhNhwcXBeT-jvRe1OiJTo_Ayg%40mail.gmail.com Backpatch-through: 16	5 months ago
Noah Misch	82a8f0f465	Make dblink interruptible, via new libpqsrv APIs. This replaces dblink's blocking libpq calls, allowing cancellation and allowing DROP DATABASE (of a database not involved in the query). Apart from explicit dblink_cancel_query() calls, dblink still doesn't cancel the remote side. The replacement for the blocking calls consists of new, general-purpose query execution wrappers in the libpqsrv facility. Out-of-tree extensions should adopt these. The original commit `d3c5f37dd5` did not back-patch. Back-patch now to v16-v13, bringing coverage to all supported versions. This back-patch omits the orignal's refactoring in postgres_fdw. Discussion: https://postgr.es/m/20231122012945.74@rfd.leadboat.com	5 months ago
Tom Lane	5fb9f967c3	Remove unnecessary type violation in tsvectorrecv(). compareentry() is declared to work on WordEntryIN structs, but tsvectorrecv() is using it in two places to work on WordEntry structs. This is almost okay, since WordEntry is the first field of WordEntryIN. But on machines with 8-byte pointers, WordEntryIN will have a larger alignment spec than WordEntry, and it's at least theoretically possible that the compiler could generate code that depends on the larger alignment. Given the lack of field reports, this may be just a hypothetical bug that upsets nothing except sanitizer tools. Or it may be real on certain hardware but nobody's tried to use tsvectorrecv() on such hardware. In any case we should fix it, and the fix is trivial: just change compareentry() so that it works on WordEntry without any mention of WordEntryIN. We can also get rid of the quite-useless intermediate function WordEntryCMP. Bug: #18875 Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18875-07a29c49c825a608@postgresql.org Backpatch-through: 13	5 months ago
Andres Freund	980727b841	Remove HeapBitmapScan's skip_fetch optimization The optimization does not take the removal of TIDs by a concurrent vacuum into account. The concurrent vacuum can remove dead TIDs and make pages ALL_VISIBLE while those dead TIDs are referenced in the bitmap. This can lead to a skip_fetch scan returning too many tuples. It likely would be possible to implement this optimization safely, but we don't have the necessary infrastructure in place. Nor is it clear that it's worth building that infrastructure, given how limited the skip_fetch optimization is. In the backbranches we just disable the optimization by always passing need_tuples=true to table_beginscan_bm(). We can't perform API/ABI changes in the backbranches and we want to make the change as minimal as possible. Author: Matthias van de Meent <boekewurm+postgres@gmail.com> Reported-By: Konstantin Knizhnik <knizhnik@garret.ru> Discussion: https://postgr.es/m/CAEze2Wg3gXXZTr6_rwC+s4-o2ZVFB5F985uUSgJTsECx6AmGcQ@mail.gmail.com Backpatch-through: 13	5 months ago
Tom Lane	053222a97b	Need to do CommandCounterIncrement after StoreAttrMissingVal. Without this, an additional change to the same pg_attribute row within the same command will fail. This is possible at least with ALTER TABLE ADD COLUMN on a multiple-inheritance-pathway structure. (Another potential hazard is that immediately-following operations might not see the missingval.) Introduced by `95f650674`, which split the former coding that used a single pg_attribute update to change both atthasdef and atthasmissing/attmissingval into two updates, but missed that this should entail two CommandCounterIncrements as well. Like that fix, back-patch through v13. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/025a3ffa-5eff-4a88-97fb-8f583b015965@gmail.com Backpatch-through: 13	5 months ago
Peter Eisentraut	548184dd16	Fix code comment The changes made in commit `d2b4b4c225` contained incorrect comments: They said that certain forward declarations were necessary to "avoid including pathnodes.h here", but the file is itself pathnodes.h! So change the comment to just say it's a forward declaration in one case, and in the other case we don't need the declaration at all because it already appeared earlier in the file.	5 months ago
David Rowley	9b34f10ee0	Doc: add information about partition locking The documentation around locking of partitions for the executor startup phase of run-time partition pruning wasn't clear about which partitions were being locked. Fix that. Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/CAApHDvp738G75HfkKcfXaf3a8s%3D6mmtOLh46tMD0D2hAo1UCzA%40mail.gmail.com Backpatch-through: 13	5 months ago
David Rowley	5a0840b767	Fix planner's failure to identify multiple hashable ScalarArrayOpExprs `50e17ad28` (v14) and `29f45e299` (v15) made it so the planner could identify IN and NOT IN clauses which have Const lists as right-hand arguments and when an appropriate hash function is available for the data types, mark the ScalarArrayOpExpr as hashable so the executor could execute it more optimally by building and probing a hash table during expression evaluation. These commits both worked correctly when there was only a single ScalarArrayOpExpr in the given expression being processed by the planner, but when there were multiple, only the first was checked and any subsequent ones were not identified, which resulted in less optimal expression evaluation during query execution for all but the first found ScalarArrayOpExpr. Backpatch to 14, where `50e17ad28` was introduced. Author: David Geier <geidav.pg@gmail.com> Discussion: https://postgr.es/m/29a76f51-97b0-4c07-87b7-ec8e3b5345c9@gmail.com Backpatch-through: 14	5 months ago
Tom Lane	a39eb9c77f	Fix detection and handling of strchrnul() for macOS 15.4. As of 15.4, macOS has strchrnul(), but access to it is blocked behind a check for MACOSX_DEPLOYMENT_TARGET >= 15.4. But our does-it-link configure check finds it, so we try to use it, and fail with the present default deployment target (namely 15.0). This accounts for today's buildfarm failures on indri and sifaka. This is the identical problem that we faced some years ago when Apple introduced preadv and pwritev in the same way. We solved that in commit `f014b1b9b` by using AC_CHECK_DECLS instead of AC_CHECK_FUNCS to check the functions' availability. So do the same now for strchrnul(). Interestingly, we already had a workaround for "the link check doesn't agree with <string.h>" cases with glibc, which we no longer need since only the header declaration is being checked. Testing this revealed that the meson version of this check has never worked, because it failed to use "-Werror=unguarded-availability-new". (Apparently nobody's tried to build with meson on macOS versions that lack preadv/pwritev as standard.) Adjust that while at it. Also, we had never put support for "-Werror=unguarded-availability-new" into v13, but we need that now. Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us> Co-authored-by: Peter Eisentraut <peter@eisentraut.org> Discussion: https://postgr.es/m/385134.1743523038@sss.pgh.pa.us Backpatch-through: 13	5 months ago
Dean Rasheed	8d4cd3b4a8	Fix MERGE with DO NOTHING actions into a partitioned table. ExecInitPartitionInfo() duplicates much of the logic in ExecInitMerge(), except that it failed to handle DO NOTHING actions. This would cause an "unknown action in MERGE WHEN clause" error if a MERGE with any DO NOTHING actions attempted to insert into a partition not already initialised by ExecInitModifyTable(). Bug: #18871 Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Gurjeet Singh <gurjeet@singh.im> Discussion: https://postgr.es/m/18871-b44e3c96de3bd2e8%40postgresql.org Backpatch-through: 15	6 months ago
Daniel Gustafsson	8d48e84c56	Fix guc_malloc calls for consistency and OOM checks check_createrole_self_grant and check_synchronized_standby_slots were allocating memory on a LOG elevel without checking if the allocation succeeded or not, which would have led to a segfault on allocation failure. On top of that, a number of callsites were using the ERROR level, relying on erroring out rather than returning false to allow the GUC machinery handle it gracefully. Other callsites used WARNING instead of LOG. While neither being not wrong, this changes all check_ functions do it consistently with LOG. init_custom_variable gets a promoted elevel to FATAL to keep the guc_malloc error handling in line with the rest of the error handling in that function which already call FATAL. If we encounter an OOM in this callsite there is no graceful handling to be had, better to error out hard. Backpatch the fix to check_createrole_self_grant down to v16 and the fix to check_synchronized_standby_slots down to v17 where they were introduced. Author: Daniel Gustafsson <daniel@yesql.se> Reported-by: Nikita <pm91.arapov@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Bug: #18845 Discussion: https://postgr.es/m/18845-582c6e10247377ec@postgresql.org Backpatch-through: 16	6 months ago
Tom Lane	41ed749e48	Prevent assertion failure in contrib/pg_freespacemap. Applying pg_freespacemap() to a relation lacking storage (such as a view) caused an assertion failure, although there was no ill effect in non-assert builds. Add an error check for that case. Bug: #18866 Reported-by: Robins Tharakan <tharakan@gmail.com> Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Euler Taveira <euler@eulerto.com> Discussion: https://postgr.es/m/18866-d68926d0f1c72d44@postgresql.org Backpatch-through: 13	6 months ago
Michael Paquier	4fd0156a6d	doc: Correct description of values used in FSM for indexes The implementation of FSM for indexes is simpler than heap, where 0 is used to track if a page is in-use and (BLCKSZ - 1) if a page is free. One comment in indexfsm.c and one description in the documentation of pg_freespacemap were incorrect about that. Author: Alex Friedman <alexf01@gmail.com> Discussion: https://postgr.es/m/71eef655-c192-453f-ac45-2772fec2cb04@gmail.com Backpatch-through: 13	6 months ago
Tomas Vondra	ebcc799a77	Keep the decompressed filter in brin_bloom_union The brin_bloom_union() function combines two BRIN summaries, by merging one filter into the other. With bloom, we have to decompress the filters first, but the function failed to update the summary to store the merged filter. As a consequence, the index may be missing some of the data, and return false negatives. This issue exists since BRIN bloom indexes were introduced in Postgres 14, but at that point the union function was called only when two sessions happened to summarize a range concurrently, which is rare. It got much easier to hit in 17, as parallel builds use the union function to merge summaries built by workers. Fixed by storing a pointer to the decompressed filter, and freeing the original one. Free the second filter too, if it was decompressed. The freeing is not strictly necessary, because the union is called in short-lived contexts, but it's tidy. Backpatch to 14, where BRIN bloom indexes were introduced. Reported by Arseniy Mukhin, investigation and fix by me. Reported-by: Arseniy Mukhin Discussion: https://postgr.es/m/18855-1cf1c8bcc22150e6%40postgresql.org Backpatch-through: 14	6 months ago
Richard Guo	de1484736d	Fix integer-overflow problem in scram_SaltedPassword() Setting the iteration count for SCRAM secret generation to INT_MAX will cause an infinite loop in scram_SaltedPassword() due to integer overflow, as the loop uses the "i <= iterations" comparison. To fix, use "i < iterations" instead. Back-patch to v16 where the user-settable GUC scram_iterations has been added. Author: Kevin K Biju <kevinkbiju@gmail.com> Reviewed-by: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/CAM45KeEMm8hnxdTOxA98qhfZ9CzGDdgy3mxgJmy0c+2WwjA6Zg@mail.gmail.com	6 months ago
Heikki Linnakangas	2f33de3cdb	Fix rare assertion failure in standby, if primary is restarted During hot standby, ExpireAllKnownAssignedTransactionIds() and ExpireOldKnownAssignedTransactionIds() functions mark old transactions as no-longer running, but they failed to update xactCompletionCount and latestCompletedXid. AFAICS it would not lead to incorrect query results, because those functions effectively turn in-progress transactions into aborted transactions and an MVCC snapshot considers both as "not visible". But it could surprise GetSnapshotDataReuse() and trigger the "TransactionIdPrecedesOrEquals(TransactionXmin, RecentXmin))" assertion in it, if the apparent xmin in a backend would move backwards. We saw this happen when GetCatalogSnapshot() would reuse an older catalog snapshot, when GetTransactionSnapshot() had already advanced TransactionXmin. The bug goes back all the way to commit `623a9ba79b` in v14 that introduced the snapshot reuse mechanism, but it started to happen more frequently with commit `952365cded` which removed a GetTransactionSnapshot() call from backend startup. That made it more likely for ExpireOldKnownAssignedTransactionIds() to be called between GetCatalogSnapshot() and the first GetTransactionSnapshot() in a backend. Andres Freund first spotted this assertion failure on buildfarm member 'skink'. Reproduction and analysis by Tomas Vondra. Backpatch-through: 14 Discussion: https://www.postgresql.org/message-id/oey246mcw43cy4qw2hqjmurbd62lfdpcuxyqiu7botx3typpax%40h7o7mfg5zmdj	6 months ago
Tom Lane	a28c1fb619	Fix plpgsql's handling of simple expressions in scrollable cursors. exec_save_simple_expr did not account for the possibility that standard_planner would stick a Materialize node atop the plan of even a simple Result, if CURSOR_OPT_SCROLL is set. This led to an "unexpected plan node type" error. This is a very old bug, but it'd only be reached by declaring a cursor for a "SELECT simple-expression" query and explicitly marking it scrollable, which is an odd thing to do. So the lack of prior reports isn't too surprising. Bug: #18859 Reported-by: Olleg Samoylov <splarv@ya.ru> Author: Andrei Lepikhov <lepihov@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18859-0d5f28ac99a37059@postgresql.org Backpatch-through: 13	6 months ago
Fujii Masao	9070e5840a	doc: Remove incorrect description about dropping replication slots. pg_drop_replication_slot() can drop replication slots created on a different database than the one where it is executed. This behavior has been in place since PostgreSQL 9.4, when pg_drop_replication_slot() was introduced. However, commit ff539d mistakenly added the following incorrect description in the documentation: For logical slots, this must be called when connected to the same database the slot was created on. This commit removes that incorrect statement. A similar mistake was also present in the documentation for the DROP_REPLICATION_SLOT command, which has now been corrected as well. Back-patch to all supported versions. Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/OSCPR01MB14966C6BE304B5BB2E58D4009F5DE2@OSCPR01MB14966.jpnprd01.prod.outlook.com Backpatch-through: 13	6 months ago
Andres Freund	d9bc607052	meson: Flush stdout in testwrap Otherwise the progress won't reliably be displayed during a test. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/kx6xu7suexal5vwsxpy7ybgkcznx6hgywbuhkr6qabcwxjqax2@i4pcpk75jvaa Backpatch-through: 16	6 months ago
Tom Lane	0405982c7c	Fix ARRAY_SUBLINK and ARRAY[] for int2vector and oidvector input. If the given input_type yields valid results from both get_element_type and get_array_type, initArrayResultAny believed the former and treated the input as an array type. However this is inconsistent with what get_promoted_array_type does, leading to situations where the output of an ARRAY() subquery is labeled with the wrong type: it's labeled as oidvector[] but is really a 2-D array of OID. That at least results in strange output, and can result in crashes if further processing such as unnest() is applied. AFAIK this is only possible with the int2vector and oidvector types, which are special-cased to be treated mostly as true arrays even though they aren't quite. Fix by switching the logic to match get_promoted_array_type by testing get_array_type not get_element_type, and remove an Assert thereby made pointless. (We need not introduce a symmetrical check for get_element_type in the other if-branch, because initArrayResultArr will check it.) This restores the behavior that existed before `bac27394a` introduced initArrayResultAny: the output really is int2vector[] or oidvector[]. Comparable confusion exists when an input of an ARRAY[] construct is int2vector or oidvector: transformArrayExpr decides it's dealing with a multidimensional array constructor, and we end up with something that's a multidimensional OID array but is alleged to be of type oidvector. I have not found a crashing case here, but it's easy to demonstrate totally-wrong results. Adjust that code so that what you get is an oidvector[] instead, for consistency with ARRAY() subqueries. (This change also makes these types work like domains-over-arrays in this context, which seems correct.) Bug: #18840 Reported-by: yang lei <ylshiyu@126.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/18840-fbc9505f066e50d6@postgresql.org Backpatch-through: 13	6 months ago

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