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Stabilize postgres_fdw test

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The test fails when RESET statement_timeout takes longer than 10ms.
Avoid the problem by using SET LOCAL instead.

Overall, this test is not ideal: 10ms could be shorter than the time to
have sent the query to the "remote" server, so it's possible that on
some machines this test doesn't actually witness a remote query being
cancelled.  We may want to improve on this someday by using some other
testing technique, but for now it's better than nothing.  I verified
manually that one round of remote cancellation occurs when this runs on
my machine.

Discussion: https://postgr.es/m/CAGECzQRsdWnj=YaaPCnA8d7E1AdbxRPBYmyBQRMPUijR2MpM_w@mail.gmail.com
This commit is contained in:
Alvaro Herrera 2024-03-30 14:16:54 +01:00
parent 056c565742
commit ecf741cfae
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2 changed files with 6 additions and 4 deletions
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5
contrib/postgres_fdw/expected/postgres_fdw.out
View File

@ -2750,10 +2750,11 @@ EXPLAIN (VERBOSE, COSTS OFF) SELECT count(*) FROM ft1 CROSS JOIN ft2 CROSS JOIN
(4 rows)
-- Make sure query cancellation works
SET statement_timeout = '10ms';
BEGIN;
SET LOCAL statement_timeout = '10ms';
select count(*) from ft1 CROSS JOIN ft2 CROSS JOIN ft4 CROSS JOIN ft5; -- this takes very long
ERROR: canceling statement due to statement timeout
RESET statement_timeout;
COMMIT;
-- ====================================================================
-- Check that userid to use when querying the remote table is correctly
-- propagated into foreign rels present in subqueries under an UNION ALL

5
contrib/postgres_fdw/sql/postgres_fdw.sql
View File

@ -740,9 +740,10 @@ ALTER VIEW v4 OWNER TO regress_view_owner;
-- Make sure this big CROSS JOIN query is pushed down
EXPLAIN (VERBOSE, COSTS OFF) SELECT count(*) FROM ft1 CROSS JOIN ft2 CROSS JOIN ft4 CROSS JOIN ft5;
-- Make sure query cancellation works
SET statement_timeout = '10ms';
BEGIN;
SET LOCAL statement_timeout = '10ms';
select count(*) from ft1 CROSS JOIN ft2 CROSS JOIN ft4 CROSS JOIN ft5; -- this takes very long
RESET statement_timeout;
COMMIT;
-- ====================================================================
-- Check that userid to use when querying the remote table is correctly