-- predictability
SET synchronous_commit = on;
DROP TABLE IF EXISTS replication_example;
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
 ?column? 
----------
 init
(1 row)

CREATE TABLE replication_example(id SERIAL PRIMARY KEY, somedata int, text varchar(120));
INSERT INTO replication_example(somedata) VALUES (1);
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                                                   data                                                   
----------------------------------------------------------------------------------------------------------
 BEGIN
 table public.replication_example: INSERT: id[integer]:1 somedata[integer]:1 text[character varying]:null
 COMMIT
(3 rows)

BEGIN;
INSERT INTO replication_example(somedata) VALUES (2);
ALTER TABLE replication_example ADD COLUMN testcolumn1 int;
INSERT INTO replication_example(somedata, testcolumn1) VALUES (3,  1);
COMMIT;
BEGIN;
INSERT INTO replication_example(somedata) VALUES (3);
ALTER TABLE replication_example ADD COLUMN testcolumn2 int;
INSERT INTO replication_example(somedata, testcolumn1, testcolumn2) VALUES (4,  2, 1);
COMMIT;
VACUUM FULL pg_am;
VACUUM FULL pg_amop;
VACUUM FULL pg_proc;
VACUUM FULL pg_opclass;
VACUUM FULL pg_type;
VACUUM FULL pg_index;
VACUUM FULL pg_database;
-- repeated rewrites that fail
BEGIN;
CLUSTER pg_class USING pg_class_oid_index;
CLUSTER pg_class USING pg_class_oid_index;
ROLLBACK;
-- repeated rewrites that succeed
BEGIN;
CLUSTER pg_class USING pg_class_oid_index;
CLUSTER pg_class USING pg_class_oid_index;
CLUSTER pg_class USING pg_class_oid_index;
COMMIT;
 -- repeated rewrites in different transactions
VACUUM FULL pg_class;
VACUUM FULL pg_class;
INSERT INTO replication_example(somedata, testcolumn1) VALUES (5, 3);
BEGIN;
INSERT INTO replication_example(somedata, testcolumn1) VALUES (6, 4);
ALTER TABLE replication_example ADD COLUMN testcolumn3 int;
INSERT INTO replication_example(somedata, testcolumn1, testcolumn3) VALUES (7, 5, 1);
COMMIT;
-- make old files go away
CHECKPOINT;
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
                                                                                       data                                                                                       
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 BEGIN
 table public.replication_example: INSERT: id[integer]:2 somedata[integer]:2 text[character varying]:null
 table public.replication_example: INSERT: id[integer]:3 somedata[integer]:3 text[character varying]:null testcolumn1[integer]:1
 COMMIT
 BEGIN
 table public.replication_example: INSERT: id[integer]:4 somedata[integer]:3 text[character varying]:null testcolumn1[integer]:null
 table public.replication_example: INSERT: id[integer]:5 somedata[integer]:4 text[character varying]:null testcolumn1[integer]:2 testcolumn2[integer]:1
 COMMIT
 BEGIN
 table public.replication_example: INSERT: id[integer]:6 somedata[integer]:5 text[character varying]:null testcolumn1[integer]:3 testcolumn2[integer]:null
 COMMIT
 BEGIN
 table public.replication_example: INSERT: id[integer]:7 somedata[integer]:6 text[character varying]:null testcolumn1[integer]:4 testcolumn2[integer]:null
 table public.replication_example: INSERT: id[integer]:8 somedata[integer]:7 text[character varying]:null testcolumn1[integer]:5 testcolumn2[integer]:null testcolumn3[integer]:1
 COMMIT
(15 rows)

SELECT pg_drop_replication_slot('regression_slot');
 pg_drop_replication_slot 
--------------------------
 
(1 row)

DROP TABLE IF EXISTS replication_example;