Parsed test spec with 2 sessions

starting permutation: s0_begin s0_getxid s1_begin s1_insert s0_alter s0_commit s0_checkpoint s0_get_changes s0_get_changes s1_commit s0_vacuum s0_get_changes
step s0_begin: BEGIN;
step s0_getxid: SELECT pg_current_xact_id() IS NULL;
?column?
--------
f       
(1 row)

step s1_begin: BEGIN;
step s1_insert: INSERT INTO harvest VALUES ((1, 2, 3));
step s0_alter: ALTER TYPE basket DROP ATTRIBUTE mangos;
step s0_commit: COMMIT;
step s0_checkpoint: CHECKPOINT;
step s0_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
data
----
(0 rows)

step s0_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
data
----
(0 rows)

step s1_commit: COMMIT;
step s0_vacuum: VACUUM pg_attribute;
step s0_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
data                                                  
------------------------------------------------------
BEGIN                                                 
table public.harvest: INSERT: fruits[basket]:'(1,2,3)'
COMMIT                                                
(3 rows)

?column?
--------
stop    
(1 row)


starting permutation: s0_begin s0_getxid s1_begin s1_insert s0_alter s0_commit s0_checkpoint s0_advance_slot s0_advance_slot s1_commit s0_vacuum s0_get_changes
step s0_begin: BEGIN;
step s0_getxid: SELECT pg_current_xact_id() IS NULL;
?column?
--------
f       
(1 row)

step s1_begin: BEGIN;
step s1_insert: INSERT INTO harvest VALUES ((1, 2, 3));
step s0_alter: ALTER TYPE basket DROP ATTRIBUTE mangos;
step s0_commit: COMMIT;
step s0_checkpoint: CHECKPOINT;
step s0_advance_slot: SELECT slot_name FROM pg_replication_slot_advance('isolation_slot', pg_current_wal_lsn());
slot_name     
--------------
isolation_slot
(1 row)

step s0_advance_slot: SELECT slot_name FROM pg_replication_slot_advance('isolation_slot', pg_current_wal_lsn());
slot_name     
--------------
isolation_slot
(1 row)

step s1_commit: COMMIT;
step s0_vacuum: VACUUM pg_attribute;
step s0_get_changes: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
data                                                  
------------------------------------------------------
BEGIN                                                 
table public.harvest: INSERT: fruits[basket]:'(1,2,3)'
COMMIT                                                
(3 rows)

?column?
--------
stop    
(1 row)