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| author | Alexander Korotkov <akorotkov@postgresql.org> | 2025-03-25 05:49:47 +0200 |
|---|---|---|
| committer | Alexander Korotkov <akorotkov@postgresql.org> | 2025-03-25 05:49:47 +0200 |
| commit | 023fb512755ffb64949eb6de8464c259ca70f1bd (patch) | |
| tree | 4fe850ddc23984be6ddbb090b8b9c8fa49e0dcd2 /contrib/postgres_fdw/expected/postgres_fdw.out | |
| parent | adb5f85fa5a00d6d5759df55feb16dc22b0fc8d7 (diff) | |
| download | postgresql-023fb512755ffb64949eb6de8464c259ca70f1bd.tar.gz postgresql-023fb512755ffb64949eb6de8464c259ca70f1bd.zip | |
postgres_fdw: Avoid pulling up restrict infos from subqueries
Semi-join joins below left/right join are deparsed as
subqueries. Thus, we can't refer to subqueries vars from upper relations.
This commit avoids pulling conditions from them.
Reported-by: Robins Tharakan <tharakan@gmail.com>
Bug: #18852
Discussion: https://postgr.es/m/CAEP4nAzryLd3gwcUpFBAG9MWyDfMRX8ZjuyY2XXjyC_C6k%2B_Zw%40mail.gmail.com
Author: Alexander Pyhalov <a.pyhalov@postgrespro.ru>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Backpatch-through: 17
Diffstat (limited to 'contrib/postgres_fdw/expected/postgres_fdw.out')
| -rw-r--r-- | contrib/postgres_fdw/expected/postgres_fdw.out | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out index bb4ed3059c4..d1acee5a5fa 100644 --- a/contrib/postgres_fdw/expected/postgres_fdw.out +++ b/contrib/postgres_fdw/expected/postgres_fdw.out @@ -4936,6 +4936,44 @@ SELECT ft2.*, ft4.* FROM ft2 INNER JOIN ----+----+----+----+----+----+----+----+----+----+---- (0 rows) +-- Semi-join conditions shouldn't pop up as left/right join clauses. +SET enable_material TO off; +EXPLAIN (verbose, costs off) +SELECT x1.c1 FROM + (SELECT * FROM ft2 WHERE EXISTS (SELECT 1 FROM ft4 WHERE ft4.c1 = ft2.c1 AND ft2.c2 < 10)) x1 + RIGHT JOIN + (SELECT * FROM ft2 WHERE EXISTS (SELECT 1 FROM ft4 WHERE ft4.c1 = ft2.c1 AND ft2.c2 < 10)) x2 + ON (x1.c1 = x2.c1) +ORDER BY x1.c1 LIMIT 10; + QUERY PLAN +---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- + Foreign Scan + Output: ft2.c1 + Relations: ((public.ft2 ft2_1) LEFT JOIN ((public.ft2) SEMI JOIN (public.ft4))) SEMI JOIN (public.ft4 ft4_1) + Remote SQL: SELECT s9.c1 FROM ("S 1"."T 1" r6 LEFT JOIN (SELECT r4."C 1" FROM "S 1"."T 1" r4 WHERE ((r4.c2 < 10)) AND EXISTS (SELECT NULL FROM "S 1"."T 3" r5 WHERE ((r4."C 1" = r5.c1)))) s9(c1) ON (((s9.c1 = r6."C 1")))) WHERE ((r6.c2 < 10)) AND EXISTS (SELECT NULL FROM "S 1"."T 3" r7 WHERE ((r6."C 1" = r7.c1))) ORDER BY s9.c1 ASC NULLS LAST LIMIT 10::bigint +(4 rows) + +SELECT x1.c1 FROM + (SELECT * FROM ft2 WHERE EXISTS (SELECT 1 FROM ft4 WHERE ft4.c1 = ft2.c1 AND ft2.c2 < 10)) x1 + RIGHT JOIN + (SELECT * FROM ft2 WHERE EXISTS (SELECT 1 FROM ft4 WHERE ft4.c1 = ft2.c1 AND ft2.c2 < 10)) x2 + ON (x1.c1 = x2.c1) +ORDER BY x1.c1 LIMIT 10; + c1 +---- + 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 +(10 rows) + +RESET enable_material; -- Can't push down semi-join with inner rel vars in targetlist EXPLAIN (verbose, costs off) SELECT ft1.c1 FROM ft1 JOIN ft2 on ft1.c1 = ft2.c1 WHERE |