From e4380e4cf68a647d87f0e6207b513d49e802b45c Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Fri, 6 Jan 2017 14:12:52 -0500 Subject: Invalidate cached plans on FDW option changes. This fixes problems where a plan must change but fails to do so, as seen in a bug report from Rajkumar Raghuwanshi. For ALTER FOREIGN TABLE OPTIONS, do this through the standard method of forcing a relcache flush on the table. For ALTER FOREIGN DATA WRAPPER and ALTER SERVER, just flush the whole plan cache on any change in pg_foreign_data_wrapper or pg_foreign_server. That matches the way we handle some other low-probability cases such as opclass changes, and it's unclear that the case arises often enough to be worth working harder. Besides, that gives a patch that is simple enough to back-patch with confidence. Back-patch to 9.3. In principle we could apply the code change to 9.2 as well, but (a) we lack postgres_fdw to test it with, (b) it's doubtful that anyone is doing anything exciting enough with FDWs that far back to need this desperately, and (c) the patch doesn't apply cleanly. Patch originally by Amit Langote, reviewed by Etsuro Fujita and Ashutosh Bapat, who each contributed substantial changes as well. Discussion: https://postgr.es/m/CAKcux6m5cA6rRPTKkqVdJ-R=KKDfe35Q_ZuUqxDSV_4hwga=og@mail.gmail.com --- contrib/postgres_fdw/sql/postgres_fdw.sql | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'contrib/postgres_fdw/sql/postgres_fdw.sql') diff --git a/contrib/postgres_fdw/sql/postgres_fdw.sql b/contrib/postgres_fdw/sql/postgres_fdw.sql index 4bf66ad36a0..5422d65c633 100644 --- a/contrib/postgres_fdw/sql/postgres_fdw.sql +++ b/contrib/postgres_fdw/sql/postgres_fdw.sql @@ -246,12 +246,27 @@ EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1); EXPLAIN (VERBOSE, COSTS false) EXECUTE st5('foo', 1); EXECUTE st5('foo', 1); +-- altering FDW options requires replanning +PREPARE st6 AS SELECT * FROM ft1 t1 WHERE t1.c1 = t1.c2; +EXPLAIN (VERBOSE, COSTS OFF) EXECUTE st6; +PREPARE st7 AS INSERT INTO ft1 (c1,c2,c3) VALUES (1001,101,'foo'); +EXPLAIN (VERBOSE, COSTS OFF) EXECUTE st7; +ALTER TABLE "S 1"."T 1" RENAME TO "T 0"; +ALTER FOREIGN TABLE ft1 OPTIONS (SET table_name 'T 0'); +EXPLAIN (VERBOSE, COSTS OFF) EXECUTE st6; +EXECUTE st6; +EXPLAIN (VERBOSE, COSTS OFF) EXECUTE st7; +ALTER TABLE "S 1"."T 0" RENAME TO "T 1"; +ALTER FOREIGN TABLE ft1 OPTIONS (SET table_name 'T 1'); + -- cleanup DEALLOCATE st1; DEALLOCATE st2; DEALLOCATE st3; DEALLOCATE st4; DEALLOCATE st5; +DEALLOCATE st6; +DEALLOCATE st7; -- System columns, except ctid, should not be sent to remote EXPLAIN (VERBOSE, COSTS false) -- cgit v1.2.3