CREATE SCHEMA partition_wise_join;
SET search_path to partition_wise_join;
SET citus.next_shard_id TO 360147;
CREATE TABLE partitioning_hash_test(id int, subid int) PARTITION BY HASH(subid);
CREATE TABLE partitioning_hash_test_0 PARTITION OF partitioning_hash_test FOR VALUES WITH (MODULUS 3, REMAINDER 0);
CREATE TABLE partitioning_hash_test_1 PARTITION OF partitioning_hash_test FOR VALUES WITH (MODULUS 3, REMAINDER 1);
INSERT INTO partitioning_hash_test VALUES (1, 2);
INSERT INTO partitioning_hash_test VALUES (2, 13);
INSERT INTO partitioning_hash_test VALUES (3, 7);
INSERT INTO partitioning_hash_test VALUES (4, 4);
-- distribute partitioned table
SELECT create_distributed_table('partitioning_hash_test', 'id');
NOTICE:  Copying data from local table...
NOTICE:  copying the data has completed
DETAIL:  The local data in the table is no longer visible, but is still on disk.
HINT:  To remove the local data, run: SELECT truncate_local_data_after_distributing_table($$partition_wise_join.partitioning_hash_test_0$$)
NOTICE:  Copying data from local table...
NOTICE:  copying the data has completed
DETAIL:  The local data in the table is no longer visible, but is still on disk.
HINT:  To remove the local data, run: SELECT truncate_local_data_after_distributing_table($$partition_wise_join.partitioning_hash_test_1$$)
 create_distributed_table
---------------------------------------------------------------------

(1 row)

-- test partition-wise join
CREATE TABLE partitioning_hash_join_test(id int, subid int) PARTITION BY HASH(subid);
CREATE TABLE partitioning_hash_join_test_0 PARTITION OF partitioning_hash_join_test FOR VALUES WITH (MODULUS 3, REMAINDER 0);
CREATE TABLE partitioning_hash_join_test_1 PARTITION OF partitioning_hash_join_test FOR VALUES WITH (MODULUS 3, REMAINDER 1);
CREATE TABLE partitioning_hash_join_test_2 PARTITION OF partitioning_hash_join_test FOR VALUES WITH (MODULUS 3, REMAINDER 2);
SELECT create_distributed_table('partitioning_hash_join_test', 'id');
 create_distributed_table
---------------------------------------------------------------------

(1 row)

SELECT success FROM run_command_on_workers('alter system set enable_mergejoin to off');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system set enable_nestloop to off');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system set enable_indexscan to off');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system set enable_indexonlyscan to off');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system set enable_partitionwise_join to off');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('select pg_reload_conf()');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

EXPLAIN (COSTS OFF)
SELECT * FROM partitioning_hash_test JOIN partitioning_hash_join_test USING (id, subid);
                                                                           QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (Citus Adaptive)
   Task Count: 4
   Tasks Shown: One of 4
   ->  Task
         Node: host=localhost port=xxxxx dbname=regression
         ->  Hash Join
               Hash Cond: ((partitioning_hash_join_test.id = partitioning_hash_test.id) AND (partitioning_hash_join_test.subid = partitioning_hash_test.subid))
               ->  Append
                     ->  Seq Scan on partitioning_hash_join_test_0_360163 partitioning_hash_join_test_1
                     ->  Seq Scan on partitioning_hash_join_test_1_360167 partitioning_hash_join_test_2
                     ->  Seq Scan on partitioning_hash_join_test_2_360171 partitioning_hash_join_test_3
               ->  Hash
                     ->  Append
                           ->  Seq Scan on partitioning_hash_test_0_360151 partitioning_hash_test_1
                           ->  Seq Scan on partitioning_hash_test_1_360155 partitioning_hash_test_2
(15 rows)

-- set partition-wise join on and parallel to off
SELECT success FROM run_command_on_workers('alter system set enable_partitionwise_join to on');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('select pg_reload_conf()');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

-- SET enable_partitionwise_join TO on;
ANALYZE partitioning_hash_test, partitioning_hash_join_test;
EXPLAIN (COSTS OFF)
SELECT * FROM partitioning_hash_test JOIN partitioning_hash_join_test USING (id, subid);
                                                                           QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (Citus Adaptive)
   Task Count: 4
   Tasks Shown: One of 4
   ->  Task
         Node: host=localhost port=xxxxx dbname=regression
         ->  Hash Join
               Hash Cond: ((partitioning_hash_join_test.id = partitioning_hash_test.id) AND (partitioning_hash_join_test.subid = partitioning_hash_test.subid))
               ->  Append
                     ->  Seq Scan on partitioning_hash_join_test_0_360163 partitioning_hash_join_test_1
                     ->  Seq Scan on partitioning_hash_join_test_1_360167 partitioning_hash_join_test_2
                     ->  Seq Scan on partitioning_hash_join_test_2_360171 partitioning_hash_join_test_3
               ->  Hash
                     ->  Append
                           ->  Seq Scan on partitioning_hash_test_0_360151 partitioning_hash_test_1
                           ->  Seq Scan on partitioning_hash_test_1_360155 partitioning_hash_test_2
(15 rows)

-- note that partition-wise joins only work when partition key is in the join
-- following join does not have that, therefore join will not be pushed down to
-- partitions
EXPLAIN (COSTS OFF)
SELECT * FROM partitioning_hash_test JOIN partitioning_hash_join_test USING (id);
                                               QUERY PLAN
---------------------------------------------------------------------
 Custom Scan (Citus Adaptive)
   Task Count: 4
   Tasks Shown: One of 4
   ->  Task
         Node: host=localhost port=xxxxx dbname=regression
         ->  Hash Join
               Hash Cond: (partitioning_hash_join_test.id = partitioning_hash_test.id)
               ->  Append
                     ->  Seq Scan on partitioning_hash_join_test_0_360163 partitioning_hash_join_test_1
                     ->  Seq Scan on partitioning_hash_join_test_1_360167 partitioning_hash_join_test_2
                     ->  Seq Scan on partitioning_hash_join_test_2_360171 partitioning_hash_join_test_3
               ->  Hash
                     ->  Append
                           ->  Seq Scan on partitioning_hash_test_0_360151 partitioning_hash_test_1
                           ->  Seq Scan on partitioning_hash_test_1_360155 partitioning_hash_test_2
(15 rows)

-- reset partition-wise join
SELECT success FROM run_command_on_workers('alter system reset enable_partitionwise_join');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system reset enable_mergejoin');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system reset enable_nestloop');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system reset enable_indexscan');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('alter system reset enable_indexonlyscan');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

SELECT success FROM run_command_on_workers('select pg_reload_conf()');
 success
---------------------------------------------------------------------
 t
 t
(2 rows)

RESET enable_partitionwise_join;
DROP SCHEMA partition_wise_join CASCADE;
NOTICE:  drop cascades to 2 other objects
DETAIL:  drop cascades to table partitioning_hash_test
drop cascades to table partitioning_hash_join_test