1Parsed test spec with 2 sessions 2 3starting permutation: s0_begin s0_begin_sub0 s0_log_assignment s0_sub_get_base_snap s1_produce_new_snap s0_insert s0_end_sub0 s0_commit s0_get_changes 4step s0_begin: BEGIN; 5step s0_begin_sub0: SAVEPOINT s0; 6step s0_log_assignment: SELECT txid_current() IS NULL; 7?column? 8-------- 9f 10(1 row) 11 12step s0_sub_get_base_snap: INSERT INTO dummy VALUES (0); 13step s1_produce_new_snap: ALTER TABLE harvest ADD COLUMN mangos int; 14step s0_insert: INSERT INTO harvest VALUES (1, 2, 3); 15step s0_end_sub0: RELEASE SAVEPOINT s0; 16step s0_commit: COMMIT; 17step s0_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); 18data 19---------------------------------------------------------------------------------- 20BEGIN 21table public.dummy: INSERT: i[integer]:0 22table public.harvest: INSERT: apples[integer]:1 pears[integer]:2 mangos[integer]:3 23COMMIT 24(4 rows) 25 26?column? 27-------- 28stop 29(1 row) 30 31 32starting permutation: s0_begin s0_begin_sub0 s0_log_assignment s0_begin_sub1 s0_sub_get_base_snap s1_produce_new_snap s0_insert s0_end_sub1 s0_end_sub0 s0_commit s0_get_changes 33step s0_begin: BEGIN; 34step s0_begin_sub0: SAVEPOINT s0; 35step s0_log_assignment: SELECT txid_current() IS NULL; 36?column? 37-------- 38f 39(1 row) 40 41step s0_begin_sub1: SAVEPOINT s1; 42step s0_sub_get_base_snap: INSERT INTO dummy VALUES (0); 43step s1_produce_new_snap: ALTER TABLE harvest ADD COLUMN mangos int; 44step s0_insert: INSERT INTO harvest VALUES (1, 2, 3); 45step s0_end_sub1: RELEASE SAVEPOINT s1; 46step s0_end_sub0: RELEASE SAVEPOINT s0; 47step s0_commit: COMMIT; 48step s0_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); 49data 50---------------------------------------------------------------------------------- 51BEGIN 52table public.dummy: INSERT: i[integer]:0 53table public.harvest: INSERT: apples[integer]:1 pears[integer]:2 mangos[integer]:3 54COMMIT 55(4 rows) 56 57?column? 58-------- 59stop 60(1 row) 61 62