SET synchronous_commit = on;
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
 ?column? 
----------
 init
(1 row)

CREATE TABLE stream_test(data text);
-- consume DDL
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
 data 
------
(0 rows)

-- streaming test with sub-transaction
BEGIN;
savepoint s1;
SELECT 'msg5' FROM pg_logical_emit_message(true, 'test', repeat('a', 50));
 ?column? 
----------
 msg5
(1 row)

INSERT INTO stream_test SELECT repeat('a', 2000) || g.i FROM generate_series(1, 35) g(i);
TRUNCATE table stream_test;
rollback to s1;
INSERT INTO stream_test SELECT repeat('a', 10) || g.i FROM generate_series(1, 20) g(i);
COMMIT;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
                           data                           
----------------------------------------------------------
 streaming message: transactional: 1 prefix: test, sz: 50
 opening a streamed block for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 closing a streamed block for transaction
 committing streamed transaction
(24 rows)

-- streaming test for toast changes
ALTER TABLE stream_test ALTER COLUMN data set storage external;
-- consume DDL
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
 data 
------
(0 rows)

INSERT INTO stream_test SELECT repeat('a', 6000) || g.i FROM generate_series(1, 10) g(i);
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
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 closing a streamed block for transaction
 committing streamed transaction
(13 rows)

-- streaming test for toast with multi-insert
\COPY stream_test FROM STDIN
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
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 streaming change for transaction
 closing a streamed block for transaction
 opening a streamed block for transaction
 streaming change for transaction
 closing a streamed block for transaction
 committing streamed transaction
(17 rows)

DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
 pg_drop_replication_slot 
--------------------------
 
(1 row)