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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/sql/postgres_fdw.sql | |
| 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/sql/postgres_fdw.sql')
| -rw-r--r-- | contrib/postgres_fdw/sql/postgres_fdw.sql | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/contrib/postgres_fdw/sql/postgres_fdw.sql b/contrib/postgres_fdw/sql/postgres_fdw.sql index d45e9f8ab52..ea6287b03fd 100644 --- a/contrib/postgres_fdw/sql/postgres_fdw.sql +++ b/contrib/postgres_fdw/sql/postgres_fdw.sql @@ -1455,6 +1455,23 @@ SELECT ft2.*, ft4.* FROM ft2 INNER JOIN WHERE ft2.c1 > 900 ORDER BY ft2.c1 LIMIT 10; +-- 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; +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; +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 |