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Support for deparsing of ArrayCoerceExpr node in contrib/postgres_fdw

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When using a prepared statement to select data from a PostgreSQL foreign
table (postgres_fdw) with the "field = ANY($1)" expression, the operation
is not pushed down when an implicit type case is applied, and a generic plan
is used.  This commit resolves the issue by supporting the push-down of
ArrayCoerceExpr, which is used in this case.  The support is quite
straightforward and similar to other nods, such as RelabelType.

Discussion: https://postgr.es/m/4f0cea802476d23c6e799512ffd17aff%40postgrespro.ru
Author: Alexander Pyhalov <a.pyhalov@postgrespro.ru>
Reviewed-by: Maxim Orlov <orlovmg@gmail.com>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
This commit is contained in:
Alexander Korotkov
2025-07-18 10:52:05 +03:00
parent b597ae6cc1
commit 62c3b4cd9d
3 changed files with 80 additions and 0 deletions
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9
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -458,6 +458,15 @@ SELECT * FROM ft1 WHERE CASE c3 WHEN c6 THEN true ELSE c3 < 'bar' END;
EXPLAIN (VERBOSE, COSTS OFF)
SELECT * FROM ft1 WHERE CASE c3 COLLATE "C" WHEN c6 THEN true ELSE c3 < 'bar' END;
-- Test array type conversion pushdown
SET plan_cache_mode = force_generic_plan;
PREPARE s(varchar[]) AS SELECT count(*) FROM ft2 WHERE c6 = ANY ($1);
EXPLAIN (VERBOSE, COSTS OFF)
EXECUTE s(ARRAY['1','2']);
EXECUTE s(ARRAY['1','2']);
DEALLOCATE s;
RESET plan_cache_mode;
-- a regconfig constant referring to this text search configuration
-- is initially unshippable
CREATE TEXT SEARCH CONFIGURATION public.custom_search