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pgsql: Fix semijoin unique-ification for child relations 2+ messages / 1 participants [nested] [flat]
* pgsql: Fix semijoin unique-ification for child relations @ 2025-08-29 04:14 Richard Guo <rguo@postgresql.org> 0 siblings, 0 replies; 2+ messages in thread From: Richard Guo @ 2025-08-29 04:14 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org Fix semijoin unique-ification for child relations For a child relation, we should not assume that its parent's unique-ified relation (or unique-ified path in v18) always exists. In cases where all RHS columns that need to be unique-ified are equated to constants, the unique-ified relation/path for the parent table is not built, as there are no columns left to unique-ify. Failing to account for this can result in a SIGSEGV crash during planning. This patch checks whether the parent's unique-ified relation or path exists and skips unique-ification of the child relation if it does not. Author: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CAMbWs49MOdLW2c+qbLHHBt8VBu=4ONpM91D19=AWeW93eFUF6A@mail.gmail.com Backpatch-through: 18 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/97b0f36bde9a08bc6f004438ff8fc0afbcb418c0 Modified Files -------------- src/backend/optimizer/plan/planner.c | 9 ++++++ src/test/regress/expected/join.out | 60 ++++++++++++++++++++++++++++++++++++ src/test/regress/sql/join.sql | 37 ++++++++++++++++++++++ 3 files changed, 106 insertions(+) ^ permalink raw reply [nested|flat] 2+ messages in thread
* pgsql: Fix semijoin unique-ification for child relations @ 2025-08-29 04:17 Richard Guo <rguo@postgresql.org> 0 siblings, 0 replies; 2+ messages in thread From: Richard Guo @ 2025-08-29 04:17 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org Fix semijoin unique-ification for child relations For a child relation, we should not assume that its parent's unique-ified relation (or unique-ified path in v18) always exists. In cases where all RHS columns that need to be unique-ified are equated to constants, the unique-ified relation/path for the parent table is not built, as there are no columns left to unique-ify. Failing to account for this can result in a SIGSEGV crash during planning. This patch checks whether the parent's unique-ified relation or path exists and skips unique-ification of the child relation if it does not. Author: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CAMbWs49MOdLW2c+qbLHHBt8VBu=4ONpM91D19=AWeW93eFUF6A@mail.gmail.com Backpatch-through: 18 Branch ------ REL_18_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/58ea074f1433abdd5de792e47ae84c1e56c263f9 Modified Files -------------- src/backend/optimizer/util/pathnode.c | 9 ++++++ src/test/regress/expected/join.out | 60 +++++++++++++++++++++++++++++++++++ src/test/regress/sql/join.sql | 37 +++++++++++++++++++++ 3 files changed, 106 insertions(+) ^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~2025-08-29 04:17 UTC | newest] Thread overview: 2+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2025-08-29 04:14 pgsql: Fix semijoin unique-ification for child relations Richard Guo <rguo@postgresql.org> 2025-08-29 04:17 pgsql: Fix semijoin unique-ification for child relations Richard Guo <rguo@postgresql.org>
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