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postgres_fdw: set search_path to 'pg_catalog' while deparsing constants.

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The motivation for this is to ensure successful transmission of the
values of constants of regconfig and other reg* types.  The remote
will be reading them with search_path = 'pg_catalog', so schema
qualification is necessary when referencing objects in other schemas.

Per bug #17483 from Emmanuel Quincerot.  Back-patch to all supported
versions.  (There's some other stuff to do here, but it's less
back-patchable.)

Discussion: https://postgr.es/m/1423433.1652722406@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2022-07-17 17:27:50 -04:00
parent e993166d71
commit 0a7ccee8fe
3 changed files with 37 additions and 0 deletions
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9
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -442,6 +442,15 @@ 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;
-- check schema-qualification of regconfig constant
CREATE TEXT SEARCH CONFIGURATION public.custom_search
(COPY = pg_catalog.english);
EXPLAIN (VERBOSE, COSTS OFF)
SELECT c1, to_tsvector('custom_search'::regconfig, c3) FROM ft1
WHERE c1 = 642 AND length(to_tsvector('custom_search'::regconfig, c3)) > 0;
SELECT c1, to_tsvector('custom_search'::regconfig, c3) FROM ft1
WHERE c1 = 642 AND length(to_tsvector('custom_search'::regconfig, c3)) > 0;
-- ===================================================================
-- JOIN queries
-- ===================================================================