-- 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)

-- Decoding works in transaction that issues DDL
--
-- We had issues handling relcache invalidations with these, see
-- https://www.postgresql.org/message-id/e56be7d9-14b1-664d-0bfc-00ce9772721c@gmail.com
CREATE TABLE tbl_created_outside_xact(id SERIAL PRIMARY KEY);
BEGIN;
  -- TRUNCATE changes the relfilenode and sends relcache invalidation
  TRUNCATE tbl_created_outside_xact;
  INSERT INTO tbl_created_outside_xact(id) VALUES('1');
  -- don't show yet, haven't committed
  SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
 data 
------
(0 rows)

COMMIT;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                             data                             
--------------------------------------------------------------
 BEGIN
 table public.tbl_created_outside_xact: TRUNCATE: (no-flags)
 table public.tbl_created_outside_xact: INSERT: id[integer]:1
 COMMIT
(4 rows)

SET debug_logical_replication_streaming = immediate;
BEGIN;
  CREATE TABLE tbl_created_in_xact(id SERIAL PRIMARY KEY);
  INSERT INTO tbl_created_in_xact VALUES (1);
  CHECKPOINT; -- Force WAL flush, so that the above changes will be streamed
  SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
                   data                   
------------------------------------------
 opening a streamed block for transaction
 streaming change for transaction
 closing a streamed block for transaction
(3 rows)

COMMIT;
RESET debug_logical_replication_streaming;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                          data                           
---------------------------------------------------------
 BEGIN
 table public.tbl_created_in_xact: INSERT: id[integer]:1
 COMMIT
(3 rows)

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