-- Test behaviour of repartitioned INSERT ... SELECT in MX setup
CREATE SCHEMA multi_mx_insert_select_repartition;
SET search_path TO multi_mx_insert_select_repartition;
SET citus.next_shard_id TO 4213581;
SET citus.replication_model TO 'streaming';
SET citus.shard_replication_factor TO 1;
SET citus.shard_count TO 4;
CREATE TABLE source_table(a int, b int);
SELECT create_distributed_table('source_table', 'a');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

INSERT INTO source_table SELECT floor(i/4), i*i FROM generate_series(1, 20) i;
SET citus.shard_count TO 3;
CREATE TABLE target_table(a int, b int);
SELECT create_distributed_table('target_table', 'a');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

CREATE FUNCTION square(int) RETURNS INT
    AS $$ SELECT $1 * $1 $$
    LANGUAGE SQL;
select create_distributed_function('square(int)');
 create_distributed_function
---------------------------------------------------------------------

(1 row)

select public.colocate_proc_with_table('square', 'source_table'::regclass, 0);
 colocate_proc_with_table
---------------------------------------------------------------------

(1 row)

-- Test along with function delegation
-- function delegation only happens for "SELECT f()", and we don't use
-- repartitioned INSERT/SELECT when task count is 1, so the following
-- should go via coordinator
EXPLAIN (costs off) INSERT INTO target_table(a) SELECT square(4);
                 QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (Citus INSERT ... SELECT)
   INSERT/SELECT method: pull to coordinator
   ->  Result
(3 rows)

INSERT INTO target_table(a) SELECT square(4);
SELECT * FROM target_table;
 a  | b
---------------------------------------------------------------------
 16 |
(1 row)

TRUNCATE target_table;
--
-- Test repartitioned INSERT/SELECT from MX worker
--
\c - - - :worker_1_port
SET search_path TO multi_mx_insert_select_repartition;
EXPLAIN (costs off) INSERT INTO target_table SELECT a, max(b) FROM source_table GROUP BY a;
                              QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (Citus INSERT ... SELECT)
   INSERT/SELECT method: repartition
   ->  Custom Scan (Citus Adaptive)
         Task Count: 4
         Tasks Shown: One of 4
         ->  Task
               Node: host=localhost port=xxxxx dbname=regression
               ->  HashAggregate
                     Group Key: a
                     ->  Seq Scan on source_table_4213581 source_table
(10 rows)

INSERT INTO target_table SELECT a, max(b) FROM source_table GROUP BY a;
\c - - - :master_port
SET search_path TO multi_mx_insert_select_repartition;
SELECT * FROM target_table ORDER BY a;
 a |  b
---------------------------------------------------------------------
 0 |   9
 1 |  49
 2 | 121
 3 | 225
 4 | 361
 5 | 400
(6 rows)

RESET client_min_messages;
\set VERBOSITY terse
DROP SCHEMA multi_mx_insert_select_repartition CASCADE;
NOTICE:  drop cascades to 3 other objects