A dump/restore is not required for those running 14.X.
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\nThe PostgreSQL Project thanks Pedro Gallegos for reporting this problem. (CVE-2023-5869)
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The PostgreSQL Project thanks Hemanth Sandrana and Mahendrakar Srinivasarao for reporting this problem. (CVE-2023-5870)
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The security implications of cancelling one of these process types are fairly small so far as the core code goes (we'll just start another one), but extensions might add background workers that are more vulnerable. Also ensure that the is_superuser parameter is set correctly in such processes. No specific security consequences are known for that oversight, but it might be significant for some extensions. The PostgreSQL Project thanks Hemanth Sandrana and Mahendrakar Srinivasarao for reporting this problem. 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\nFix a case where the location of a page downlink was incorrectly tracked, and introduce some logic to allow recovering from such situations rather than silently doing the wrong thing. This error could result in incorrect answers from subsequent index searches. It may be advisable to reindex all GiST indexes after installing this update.
", "text": "Fix misbehavior during recursive page split in GiST index build (Heikki Linnakangas) § Fix a case where the location of a page downlink was incorrectly tracked, and introduce some logic to allow recovering from such situations rather than silently doing the wrong thing. This error could result in incorrect answers from subsequent index searches. It may be advisable to reindex all GiST indexes after installing this update.", "title": "Fix misbehavior during recursive page split in GiST index build", "commits": ["747cef5a5"], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/14.10/#id-1.11.6.20.5", "source_hash": "aa14cd57d7ad178665e223195a533a6222dacce54eb7f978454978bbb1980128", "section_path": ["Changes"], "commit_groups": [["26917ebea", "28d3c2ddc", "747cef5a5", "c3c284b37", "d7f521325", "db7394d4d"]], "identity_text": "Fix misbehavior during recursive page split in GiST index build (Heikki Linnakangas) Fix a case where the location of a page downlink was incorrectly tracked, and introduce some logic to allow recovering from such situations rather than silently doing the wrong thing. This error could result in incorrect answers from subsequent index searches. It may be advisable to reindex all GiST indexes after installing this update.", "commit_aliases": ["26917ebea", "28d3c2ddc", "747cef5a5", "c3c284b37", "d7f521325", "db7394d4d"], "source_commits": ["747cef5a5"], "source_entry_id": "14.10/changes/004", "db_id": "f8d168b50c33bdb06dbbba6b3a70b4c2", "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa", "relations": [{"rule": 2, "type": "equivalent", "target": "2a7ddeba40f11da483b6c48eeaebb284", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}}, {"rule": 2, "type": "equivalent", "target": "41d33305cccfb4f8758f8e889cc1bad2", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}}, {"rule": 2, "type": "equivalent", "target": "bfff1d6c07bb200f3982d273d15be0c5", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}}, {"rule": 2, "type": "equivalent", "target": "c1e0614a5596d77272d473d776a05d82", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}}], "version": "14.10", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": [{"db_id": "bfff1d6c07bb200f3982d273d15be0c5", "kind": "equivalent", "version": "16.1", "label": "16.1", "title": "Fix misbehavior during recursive page split in GiST index build", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}, "url": "/docs/compare/?release=16.1#16.1-9637104c834c3a09", "source_url": "/docs/release/16.1/#RELEASE-16-1-CHANGES"}, {"db_id": "c1e0614a5596d77272d473d776a05d82", "kind": "equivalent", "version": "15.5", "label": "15.5", "title": "Fix misbehavior during recursive page split in GiST index build", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}, "url": "/docs/compare/?release=15.5#15.5-ca9856742c0d9b93", "source_url": "/docs/release/15.5/#id-1.11.6.20.5"}, {"db_id": "41d33305cccfb4f8758f8e889cc1bad2", "kind": "equivalent", "version": "13.13", "label": "13.13", "title": "Fix misbehavior during recursive page split in GiST index build", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}, "url": "/docs/compare/?release=13.13#13.13-39edf4f51df72bcd", "source_url": "/docs/release/13.13/#id-1.11.6.16.5"}, {"db_id": "2a7ddeba40f11da483b6c48eeaebb284", "kind": "equivalent", "version": "12.17", "label": "12.17", "title": "Fix misbehavior during recursive page split in GiST index build", "evidence": {"same_day": true, "patch_ids": ["dda8015b2cb7febbee0d8ec81b15e1f1"], "statement_hash": "5c3738c63cdf2d59adc87135bcac7d2486c5d29a6b3a04ce34d8ddb67192edfa"}, "url": "/docs/compare/?release=12.17#12.17-83be794e35c5e14a", "source_url": "/docs/release/12.17/#id-1.11.6.11.5"}]}, {"id": "14.10-1f652351dd5ca6f8", "cves": [], "html": "Prevent de-duplication of btree index entries for interval columns (Noah Misch) §
There are interval values that are distinguishable but compare equal, for example 24:00:00 and 1 day. This breaks assumptions made by btree de-duplication, so interval columns need to be excluded from de-duplication. This oversight can cause incorrect results from index-only scans. Moreover, after updating amcheck will report an error for almost all such indexes. Users should reindex any btree indexes on interval columns.
Process date values more sanely in BRIN datetime_minmax_multi_ops indexes (Tomas Vondra) §
The distance calculation for dates was backward, causing poor decisions about which entries to merge. The index still produces correct results, but is much less efficient than it should be. Reindexing BRIN minmax_multi indexes on date columns is advisable.
Process large timestamp and timestamptz values more sanely in BRIN datetime_minmax_multi_ops indexes (Tomas Vondra) § §
Infinities were mistakenly treated as having distance zero rather than a large distance from other values, causing poor decisions about which entries to merge. Also, finite-but-very-large values (near the endpoints of the representable timestamp range) could result in internal overflows, again causing poor decisions. The index still produces correct results, but is much less efficient than it should be. Reindexing BRIN minmax_multi indexes on timestamp and timestamptz columns is advisable if the column contains, or has contained, infinities or large finite values.
Avoid calculation overflows in BRIN interval_minmax_multi_ops indexes with extreme interval values (Tomas Vondra) §
This bug might have caused unexpected failures while trying to insert large interval values into such an index.
", "text": "Avoid calculation overflows in BRIN interval_minmax_multi_ops indexes with extreme interval values (Tomas Vondra) § This bug might have caused unexpected failures while trying to insert large interval values into such an index.", "title": "Avoid calculation overflows in BRIN interval_minmax_multi_ops indexes with extreme interval values", "commits": ["0fa73c5cd"], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/14.10/#id-1.11.6.20.5", "source_hash": "0ccd1f5ba362466e1e6253a77fb26865582b6d8f8447359dcb54c48f0b1a93ad", "section_path": ["Changes"], "commit_groups": [["0fa73c5cd", "2fbb2fcb0", "924e0e2ee", "c6cf6d353"]], "identity_text": "Avoid calculation overflows in BRIN interval_minmax_multi_ops indexes with extreme interval values (Tomas Vondra) This bug might have caused unexpected failures while trying to insert large interval values into such an index.", "commit_aliases": ["0fa73c5cd", "2fbb2fcb0", "924e0e2ee", "c6cf6d353"], "source_commits": ["0fa73c5cd"], "source_entry_id": "14.10/changes/008", "db_id": "ddb61f045493b5688c816ae466be5ed5", "patch_ids": ["f69516fbdcc22c3c9557dcb4756468bb"], "statement_hash": "7060b57fcbbe4f22059beee39769d34361e408eb9d35e77f1b07d7781305f71b", "relations": [{"rule": 2, "type": "equivalent", "target": "0d46d6de278474592fd1902949b38c6a", "evidence": {"same_day": true, "patch_ids": ["f69516fbdcc22c3c9557dcb4756468bb"], "statement_hash": "7060b57fcbbe4f22059beee39769d34361e408eb9d35e77f1b07d7781305f71b"}}, {"rule": 2, "type": "equivalent", "target": "7a7219460b6cde5f0286d2baaf3f3965", "evidence": {"same_day": true, "patch_ids": ["f69516fbdcc22c3c9557dcb4756468bb"], "statement_hash": "7060b57fcbbe4f22059beee39769d34361e408eb9d35e77f1b07d7781305f71b"}}], "version": "14.10", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": [{"db_id": "7a7219460b6cde5f0286d2baaf3f3965", "kind": "equivalent", "version": "16.1", "label": "16.1", "title": "Avoid calculation overflows in BRIN interval_minmax_multi_ops indexes with extreme interval values", "evidence": {"same_day": true, "patch_ids": ["f69516fbdcc22c3c9557dcb4756468bb"], "statement_hash": "7060b57fcbbe4f22059beee39769d34361e408eb9d35e77f1b07d7781305f71b"}, "url": "/docs/compare/?release=16.1#16.1-fae5c38c5ea997ed", "source_url": "/docs/release/16.1/#RELEASE-16-1-CHANGES"}, {"db_id": "0d46d6de278474592fd1902949b38c6a", "kind": "equivalent", "version": "15.5", "label": "15.5", "title": "Avoid calculation overflows in BRIN interval_minmax_multi_ops indexes with extreme interval values", "evidence": {"same_day": true, "patch_ids": ["f69516fbdcc22c3c9557dcb4756468bb"], "statement_hash": "7060b57fcbbe4f22059beee39769d34361e408eb9d35e77f1b07d7781305f71b"}, "url": "/docs/compare/?release=15.5#15.5-dd7cd8df42cba374", "source_url": "/docs/release/15.5/#id-1.11.6.20.5"}]}, {"id": "14.10-09a3fc33a5e18424", "cves": [], "html": "Fix partition step generation and runtime partition pruning for hash-partitioned tables with multiple partition keys (David Rowley) § §
\nSome cases involving an IS NULL condition on one of the partition keys could result in a crash.
Correctly identify the target table in an inherited UPDATE/DELETE/MERGE even when the parent table is excluded by constraints (Amit Langote, Tom Lane) §
If the initially-named table is excluded by constraints, but not all its inheritance descendants are, the first non-excluded descendant was identified as the primary target table. This would lead to firing statement-level triggers associated with that table, rather than the initially-named table as should happen. In v16, the same oversight could also lead to “invalid perminfoindex 0 in RTE with relid NNNN” errors.
", "text": "Correctly identify the target table in an inherited UPDATE/DELETE/MERGE even when the parent table is excluded by constraints (Amit Langote, Tom Lane) § If the initially-named table is excluded by constraints, but not all its inheritance descendants are, the first non-excluded descendant was identified as the primary target table. This would lead to firing statement-level triggers associated with that table, rather than the initially-named table as should happen. In v16, the same oversight could also lead to “invalid perminfoindex 0 in RTE with relid NNNN” errors.", "title": "Correctly identify the target table in an inherited UPDATE/DELETE/MERGE even when the parent table is excluded by constraints", "commits": ["8f4a6b9e4"], "section": "Changes", "category": "improvement", "source_url": "/docs/release/14.10/#id-1.11.6.20.5", "source_hash": "6bb2a300952fb875b9fd5a4e53e69efaa28fd752408185e84cb8bcd03ecd7d39", "section_path": ["Changes"], "commit_groups": [["01575ad78", "178ee1d85"], ["1268e7378", "387f9ed0a", "8f4a6b9e4", "b1444a09d"], ["1f06b7fc6", "2bf99b48d"]], "identity_text": "Correctly identify the target table in an inherited UPDATE/DELETE/MERGE even when the parent table is excluded by constraints (Amit Langote, Tom Lane) If the initially-named table is excluded by constraints, but not all its inheritance descendants are, the first non-excluded descendant was identified as the primary target table. This would lead to firing statement-level triggers associated with that table, rather than the initially-named table as should happen. In v16, the same oversight could also lead to invalid perminfoindex 0 in RTE with relid NNNN errors.", "commit_aliases": ["01575ad78", "1268e7378", "178ee1d85", "1f06b7fc6", "2bf99b48d", "387f9ed0a", "8f4a6b9e4", "b1444a09d"], "source_commits": ["01575ad78", "1f06b7fc6", "8f4a6b9e4"], "source_entry_id": "14.10/changes/010", "db_id": "e611f263f407c7bd86d247f985adceab", "patch_ids": ["2e9435c5ff6b647b2e05bfe90186a891", "d206fd6a20b245e9b593169ba2614be6", "ddc408c57c9415868e91ac402e98520e"], "statement_hash": "2945baf49a3fa10572f71ef10fd9b38ae699b64a6fc6318346f2220ab5d40a66", "relations": [{"rule": 2, "type": "equivalent", "target": "8322f7d9982b87ba2d9974b584129577", "evidence": {"same_day": true, "patch_ids": ["2e9435c5ff6b647b2e05bfe90186a891", "d206fd6a20b245e9b593169ba2614be6", "ddc408c57c9415868e91ac402e98520e"], "statement_hash": "2945baf49a3fa10572f71ef10fd9b38ae699b64a6fc6318346f2220ab5d40a66"}}, {"rule": 2, "type": "equivalent", "target": "d987a075ebd403450d2fb6a4e2e4068e", "evidence": {"same_day": true, "patch_ids": ["2e9435c5ff6b647b2e05bfe90186a891", "d206fd6a20b245e9b593169ba2614be6", "ddc408c57c9415868e91ac402e98520e"], "statement_hash": "2945baf49a3fa10572f71ef10fd9b38ae699b64a6fc6318346f2220ab5d40a66"}}], "version": "14.10", "category_label": "Improvements", "also_in": [], "variants": [], "related_changes": [{"db_id": "8322f7d9982b87ba2d9974b584129577", "kind": "equivalent", "version": "16.1", "label": "16.1", "title": "Correctly identify the target table in an inherited UPDATE/DELETE/MERGE even when the parent table is excluded by constraints", "evidence": {"same_day": true, "patch_ids": ["2e9435c5ff6b647b2e05bfe90186a891", "d206fd6a20b245e9b593169ba2614be6", "ddc408c57c9415868e91ac402e98520e"], "statement_hash": "2945baf49a3fa10572f71ef10fd9b38ae699b64a6fc6318346f2220ab5d40a66"}, "url": "/docs/compare/?release=16.1#16.1-8d59fdb168b8b653", "source_url": "/docs/release/16.1/#RELEASE-16-1-CHANGES"}, {"db_id": "d987a075ebd403450d2fb6a4e2e4068e", "kind": "equivalent", "version": "15.5", "label": "15.5", "title": "Correctly identify the target table in an inherited UPDATE/DELETE/MERGE even when the parent table is excluded by constraints", "evidence": {"same_day": true, "patch_ids": ["2e9435c5ff6b647b2e05bfe90186a891", "d206fd6a20b245e9b593169ba2614be6", "ddc408c57c9415868e91ac402e98520e"], "statement_hash": "2945baf49a3fa10572f71ef10fd9b38ae699b64a6fc6318346f2220ab5d40a66"}, "url": "/docs/compare/?release=15.5#15.5-03842d84f3da3534", "source_url": "/docs/release/15.5/#id-1.11.6.20.5"}]}, {"id": "14.10-4ee6961756cfacbb", "cves": [], "html": "Fix edge case in btree mark/restore processing of ScalarArrayOpExpr clauses (Peter Geoghegan) §
\nWhen restoring an indexscan to a previously marked position, the code could miss required setup steps if the scan had advanced exactly to the end of the matches for a ScalarArrayOpExpr (that is, an indexcol = ANY(ARRAY[])) clause. This could result in missing some rows that should have been fetched.
Fix intra-query memory leak in Memoize execution (Orlov Aleksej, David Rowley) §
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Avoid premature memory allocation failure with long inputs to to_tsvector() (Tom Lane) §
Fix over-allocation of the constructed tsvector in tsvectorrecv() (Denis Erokhin) §
If the incoming vector includes position data, the binary receive function left wasted space (roughly equal to the size of the position data) in the finished tsvector. In extreme cases this could lead to “maximum total lexeme length exceeded” failures for vectors that were under the length limit when emitted. In any case it could lead to wasted space on-disk.
Fix incorrect coding in gtsvector_picksplit() (Alexander Lakhin) §
This could lead to poor page-split decisions in GiST indexes on tsvector columns.
Improve checks for corrupt PGLZ compressed data (Flavien Guedez) §
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Instead of propagating the current transaction's properties to the new transaction, they propagated some previous transaction's properties.
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No built-in parameter fits this description, but an extension could define such a parameter.
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This prevents possible misbehavior if any catalog entries for the temp tables have fields wide enough to require toasting (such as a very complex CHECK condition).
Avoid improper response to shutdown signals in child processes just forked by system() (Nathan Bossart) § §
This fix avoids a race condition in which a child process that has been forked off by system(), but hasn't yet exec'd the intended child program, might receive and act on a signal intended for the parent server process. That would lead to duplicate cleanup actions being performed, which will not end well.
Cope with torn reads of pg_control in frontend programs (Thomas Munro) §
On some file systems, reading pg_control may not be an atomic action when the server concurrently writes that file. This is detectable via a bad CRC. Retry a few times to see if the file becomes valid before we report error.
Avoid torn reads of pg_control in relevant SQL functions (Thomas Munro) §
Acquire the appropriate lock before reading pg_control, to ensure we get a consistent view of that file.
Avoid integer overflow when computing size of backend activity string array (Jakub Wartak) §
\nOn 64-bit machines we will allow values of track_activity_query_size large enough to cause 32-bit overflow when multiplied by the allowed number of connections. The code actually allocating the per-backend local array was careless about this though, and allocated the array incorrectly.
Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables (Heikki Linnakangas) §
The block-level counters should be reset to zero at the same time we update the current-relation field.
", "text": "Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables (Heikki Linnakangas) § The block-level counters should be reset to zero at the same time we update the current-relation field.", "title": "Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables", "commits": ["2d4f99bc6"], "section": "Changes", "category": "bugfix", "source_url": "/docs/release/14.10/#id-1.11.6.20.5", "source_hash": "1cf1656c834a02167ff7c9479a41b79c26c585fbafe39d4072833eb94280e326", "section_path": ["Changes"], "commit_groups": [["2d4f99bc6", "5ae245664", "992d2ca81", "c181f2e2b", "ed9247cd7"]], "identity_text": "Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables (Heikki Linnakangas) The block-level counters should be reset to zero at the same time we update the current-relation field.", "commit_aliases": ["2d4f99bc6", "5ae245664", "992d2ca81", "c181f2e2b", "ed9247cd7"], "source_commits": ["2d4f99bc6"], "source_entry_id": "14.10/changes/029", "db_id": "3e6301563d8b6f5deb51bd8d2a76467b", "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de", "relations": [{"rule": 2, "type": "equivalent", "target": "b2cf0429fb83e1683a752f6c88341176", "evidence": {"same_day": true, "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de"}}, {"rule": 2, "type": "equivalent", "target": "d3e873296184e51f9badc05d554234eb", "evidence": {"same_day": true, "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de"}}, {"rule": 2, "type": "equivalent", "target": "d47cbf61bbae75cbdd9fccab5d410683", "evidence": {"same_day": true, "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de"}}], "version": "14.10", "category_label": "Bug fixes", "also_in": [], "variants": [], "related_changes": [{"db_id": "b2cf0429fb83e1683a752f6c88341176", "kind": "equivalent", "version": "16.1", "label": "16.1", "title": "Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables", "evidence": {"same_day": true, "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de"}, "url": "/docs/compare/?release=16.1#16.1-219c13f32aab94e0", "source_url": "/docs/release/16.1/#RELEASE-16-1-CHANGES"}, {"db_id": "d3e873296184e51f9badc05d554234eb", "kind": "equivalent", "version": "15.5", "label": "15.5", "title": "Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables", "evidence": {"same_day": true, "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de"}, "url": "/docs/compare/?release=15.5#15.5-2c510de9de0126b0", "source_url": "/docs/release/15.5/#id-1.11.6.20.5"}, {"db_id": "d47cbf61bbae75cbdd9fccab5d410683", "kind": "equivalent", "version": "13.13", "label": "13.13", "title": "Fix briefly showing inconsistent progress statistics for ANALYZE on inherited tables", "evidence": {"same_day": true, "patch_ids": ["fb3db28284746e71ade490dd44b04d90"], "statement_hash": "3f3611ce9429eaabf1c46835ef931ed377946db82d92ee67fa60d64d5e2b98de"}, "url": "/docs/compare/?release=13.13#13.13-06f73ea6b2c20c9b", "source_url": "/docs/release/13.13/#id-1.11.6.16.5"}]}, {"id": "14.10-8729ca6f45d472eb", "cves": [], "html": "Fix the background writer to report any WAL writes it makes to the statistics counters (Nazir Bilal Yavuz) §
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DDL commands, such as replacement of a function that has been inlined into a CALL argument, can create the need to re-plan a CALL that has been cached by PL/pgSQL. That was not happening, leading to misbehavior or strange errors such as “cache lookup failed”.
Track nesting depth correctly when inspecting RECORD-type Vars from outer query levels (Richard Guo) §
This oversight could lead to assertion failures, core dumps, or “bogus varno” errors.
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Fix failure of contrib/btree_gin indexes on interval columns, when an indexscan using the < or <= operator is performed (Dean Rasheed) §
Such an indexscan failed to return all the entries it should.
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\nXcode 15 (released with macOS Sonoma) changed the linker's behavior in a way that causes many duplicate-library warnings while building PostgreSQL. These were harmless, but they're annoying so avoid citing the same libraries twice. Also remove use of the -multiply_defined suppress linker switch, which apparently has been a no-op for a long time, and is now actively complained of.
When building contrib/unaccent's rules file, fall back to using python if --with-python was not given and make variable PYTHON was not set (Japin Li) §
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