CREATE SCHEMA split_shard_replication_setup_schema;
SET search_path TO split_shard_replication_setup_schema;
SET citus.shard_replication_factor TO 1;
SET citus.shard_count TO 1;
SET citus.next_shard_id TO 1;
SELECT nodeid AS worker_1_node FROM pg_dist_node WHERE nodeport=:worker_1_port \gset
SELECT nodeid AS worker_2_node FROM pg_dist_node WHERE nodeport=:worker_2_port \gset
CREATE OR REPLACE FUNCTION wait_for_expected_rowcount_at_table(tableName text, expectedCount integer) RETURNS void AS $$
DECLARE
actualCount integer;
BEGIN
    EXECUTE FORMAT('SELECT COUNT(*) FROM %s', tableName) INTO actualCount;
    WHILE  expectedCount != actualCount LOOP
	 EXECUTE FORMAT('SELECT COUNT(*) FROM %s', tableName) INTO actualCount;
    END LOOP;
END$$ LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION wait_for_updated_rowcount_at_table(tableName text, expectedCount integer) RETURNS void AS $$
DECLARE
actualCount integer;
BEGIN
    EXECUTE FORMAT($query$SELECT COUNT(*) FROM %s WHERE value='b'$query$, tableName) INTO actualCount;
    WHILE  expectedCount != actualCount LOOP
    EXECUTE FORMAT($query$SELECT COUNT(*) FROM %s WHERE value='b'$query$, tableName) INTO actualCount;
    END LOOP;
END$$ LANGUAGE plpgsql;
-- Create distributed table (non co-located)
CREATE TABLE table_to_split (id bigserial PRIMARY KEY, value char);
SELECT create_distributed_table('table_to_split','id');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

-- Test scenario one starts from here
-- 1. table_to_split is a citus distributed table
-- 2. Shard table_to_split_1 is located on worker1.
-- 3. table_to_split_1 is split into table_to_split_2 and table_to_split_3.
--    table_to_split_2/3 are located on worker2
-- 4. execute UDF split_shard_replication_setup on worker1 with below
--    params:
--    worker_split_shard_replication_setup
--        (
--          ARRAY[
--                ROW(1 /*source shardId */, 2 /* new shardId */,-2147483648 /* minHashValue */, -1 /* maxHasValue */ , 18 /* nodeId where new shard is placed */ ),
--                ROW(1, 3 , 0 , 2147483647, 18 )
--               ]
--         );
-- 5. Create Replication slot with 'citus'
-- 6. Setup Pub/Sub
-- 7. Insert into table_to_split_1 at source worker1
-- 8. Expect the results in either table_to_split_2 or table_to_split_3 at worker2
\c - - - :worker_2_port
SET search_path TO split_shard_replication_setup_schema;
CREATE TABLE table_to_split_1(id bigserial PRIMARY KEY, value char);
CREATE TABLE table_to_split_2(id bigserial PRIMARY KEY, value char);
CREATE TABLE table_to_split_3(id bigserial PRIMARY KEY, value char);
-- Create dummy shard tables(table_to_split_2/3b) at worker1
-- This is needed for Pub/Sub framework to work.
\c - - - :worker_1_port
SET search_path TO split_shard_replication_setup_schema;
CREATE TABLE table_to_split_2(id bigserial PRIMARY KEY, value char);
CREATE TABLE table_to_split_3(id bigserial PRIMARY KEY, value char);
-- Create publication at worker1
CREATE PUBLICATION pub1 FOR TABLE table_to_split_1, table_to_split_2, table_to_split_3;
SELECT count(*) FROM pg_catalog.worker_split_shard_replication_setup(ARRAY[
    ROW(1, 'id', 2, '-2147483648', '-1', :worker_2_node)::pg_catalog.split_shard_info,
    ROW(1, 'id', 3, '0', '2147483647', :worker_2_node)::pg_catalog.split_shard_info
    ]);
 count
---------------------------------------------------------------------
     1
(1 row)

SELECT slot_name FROM pg_create_logical_replication_slot(FORMAT('citus_shard_split_slot_%s_10', :worker_2_node), 'citus') \gset
-- Create subscription at worker2 with copy_data to 'false' and derived replication slot name
\c - - - :worker_2_port
SET search_path TO split_shard_replication_setup_schema;
CREATE SUBSCRIPTION sub1
        CONNECTION 'host=localhost port=xxxxx user=postgres dbname=regression'
        PUBLICATION pub1
               WITH (
                   create_slot=false,
                   enabled=true,
                   slot_name=:slot_name,
                   copy_data=false);
-- No data is present at this moment in all the below tables at worker2
SELECT * FROM table_to_split_1;
 id | value
---------------------------------------------------------------------
(0 rows)

SELECT * FROM table_to_split_2;
 id | value
---------------------------------------------------------------------
(0 rows)

SELECT * FROM table_to_split_3;
 id | value
---------------------------------------------------------------------
(0 rows)

-- Insert data in table_to_split_1 at worker1
\c - - - :worker_1_port
SET search_path TO split_shard_replication_setup_schema;
INSERT INTO table_to_split_1 values(100, 'a');
INSERT INTO table_to_split_1 values(400, 'a');
INSERT INTO table_to_split_1 values(500, 'a');
SELECT * FROM table_to_split_1;
 id  | value
---------------------------------------------------------------------
 100 | a
 400 | a
 500 | a
(3 rows)

SELECT * FROM table_to_split_2;
 id | value
---------------------------------------------------------------------
(0 rows)

SELECT * FROM table_to_split_3;
 id | value
---------------------------------------------------------------------
(0 rows)

-- Expect data to be present in shard xxxxx and shard xxxxx based on the hash value.
\c - - - :worker_2_port
SET search_path TO split_shard_replication_setup_schema;
SELECT * FROM table_to_split_1; -- should alwasy have zero rows
 id | value
---------------------------------------------------------------------
(0 rows)

SELECT wait_for_expected_rowcount_at_table('table_to_split_2', 1);
 wait_for_expected_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_2;
 id  | value
---------------------------------------------------------------------
 400 | a
(1 row)

SELECT wait_for_expected_rowcount_at_table('table_to_split_3', 2);
 wait_for_expected_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_3;
 id  | value
---------------------------------------------------------------------
 100 | a
 500 | a
(2 rows)

-- UPDATE data of table_to_split_1 from worker1
\c - - - :worker_1_port
SET search_path TO split_shard_replication_setup_schema;
UPDATE table_to_split_1 SET value='b' WHERE id = 100;
UPDATE table_to_split_1 SET value='b' WHERE id = 400;
UPDATE table_to_split_1 SET value='b' WHERE id = 500;
\c - - - :worker_2_port
SET search_path TO split_shard_replication_setup_schema;
SELECT * FROM table_to_split_1;
 id | value
---------------------------------------------------------------------
(0 rows)

-- Value should be updated in table_to_split_2;
SELECT wait_for_updated_rowcount_at_table('table_to_split_2', 1);
 wait_for_updated_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_2;
 id  | value
---------------------------------------------------------------------
 400 | b
(1 row)

-- Value should be updated in table_to_split_3;
SELECT wait_for_updated_rowcount_at_table('table_to_split_3', 2);
 wait_for_updated_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_3;
 id  | value
---------------------------------------------------------------------
 100 | b
 500 | b
(2 rows)

\c - - - :worker_1_port
SET search_path TO split_shard_replication_setup_schema;
DELETE FROM table_to_split_1;
-- Child shard rows should be deleted
\c - - - :worker_2_port
SET search_path TO split_shard_replication_setup_schema;
SELECT wait_for_expected_rowcount_at_table('table_to_split_1', 0);
 wait_for_expected_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_1;
 id | value
---------------------------------------------------------------------
(0 rows)

SELECT wait_for_expected_rowcount_at_table('table_to_split_2', 0);
 wait_for_expected_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_2;
 id | value
---------------------------------------------------------------------
(0 rows)

SELECT wait_for_expected_rowcount_at_table('table_to_split_3', 0);
 wait_for_expected_rowcount_at_table
---------------------------------------------------------------------

(1 row)

SELECT * FROM table_to_split_3;
 id | value
---------------------------------------------------------------------
(0 rows)

 -- drop publication from worker1
\c - - - :worker_1_port
SET search_path TO split_shard_replication_setup_schema;
DROP PUBLICATION pub1;
\c - - - :worker_2_port
SET search_path TO split_shard_replication_setup_schema;
SET client_min_messages TO ERROR;
DROP SUBSCRIPTION sub1;