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Fix skip-empty-xacts with sequences in test_decoding

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Regression tests need to use skip-empty-xacts = false, because there
might be accidental concurrent activity (like autovacuum), particularly
on slow machines. The tests added by 80901b3291 failed to do that in a
couple places, triggering occasional failures on buildfarm.

Fixing the tests however uncovered a bug in the code, because sequence
callbacks did not handle skip-empty-xacts properly. For trasactional
increments we need to check/update the xact_wrote_changes flag, and emit
the BEGIN if it's the first change in the transaction.

Reported-by: Andres Freund
Discussion: https://postgr.es/m/20220212220413.b25amklo7t4xb7ni%40alap3.anarazel.de
This commit is contained in:
Tomas Vondra
2022-02-12 23:50:42 +01:00
parent faa189c932
commit b779d7d8fd
3 changed files with 31 additions and 11 deletions
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8
contrib/test_decoding/sql/sequence.sql
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@ -28,7 +28,7 @@ SELECT setval('test_sequence', 3500, false);
SELECT nextval('test_sequence');
-- show results and drop sequence
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '0');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
DROP SEQUENCE test_sequence;
-- rollback on sequence creation and update
@ -87,7 +87,7 @@ SELECT * from test_table_a_seq;
SELECT nextval('test_table_a_seq');
DROP TABLE test_table;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '0');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
-- savepoint test on table with serial column
BEGIN;
@ -99,7 +99,7 @@ INSERT INTO test_table (b) VALUES (300);
ROLLBACK TO SAVEPOINT a;
DROP TABLE test_table;
COMMIT;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '0');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
-- savepoint test on table with serial column
BEGIN;
@ -114,6 +114,6 @@ ROLLBACK TO SAVEPOINT a;
SELECT * FROM test_sequence;
DROP SEQUENCE test_sequence;
COMMIT;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '0');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
SELECT pg_drop_replication_slot('regression_slot');