-- predictability
SET synchronous_commit = on;
-- fail because we're creating a slot while in an xact with xid
BEGIN;
SELECT pg_current_xact_id() = '0';
 ?column? 
----------
 f
(1 row)

SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
ERROR:  cannot create logical replication slot in transaction that has performed writes
ROLLBACK;
-- fail because we're creating a slot while in a subxact whose topxact has an xid
BEGIN;
SELECT pg_current_xact_id() = '0';
 ?column? 
----------
 f
(1 row)

SAVEPOINT barf;
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
ERROR:  cannot create logical replication slot in transaction that has performed writes
ROLLBACK TO SAVEPOINT barf;
ROLLBACK;
-- succeed, outside tx.
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
 ?column? 
----------
 init
(1 row)

SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
 ?column? 
----------
 stop
(1 row)

-- succeed, in tx without xid.
BEGIN;
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
 ?column? 
----------
 init
(1 row)

COMMIT;
CREATE TABLE nobarf(id serial primary key, data text);
INSERT INTO nobarf(data) VALUES('1');
-- decoding works in transaction with xid
BEGIN;
SELECT pg_current_xact_id() = '0';
 ?column? 
----------
 f
(1 row)

-- don't show yet, haven't committed
INSERT INTO nobarf(data) VALUES('2');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                           data                            
-----------------------------------------------------------
 BEGIN
 table public.nobarf: INSERT: id[integer]:1 data[text]:'1'
 COMMIT
(3 rows)

COMMIT;
INSERT INTO nobarf(data) VALUES('3');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                           data                            
-----------------------------------------------------------
 BEGIN
 table public.nobarf: INSERT: id[integer]:2 data[text]:'2'
 COMMIT
 BEGIN
 table public.nobarf: INSERT: id[integer]:3 data[text]:'3'
 COMMIT
(6 rows)

SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
 ?column? 
----------
 stop
(1 row)