--
-- MULTI_SUBQUERY
--
-- no need to set shardid sequence given that we're not creating any shards

SET citus.enable_router_execution TO FALSE;

-- Check that we error out if shard min/max values are not exactly same.
SELECT
	avg(unit_price)
FROM
	(SELECT
		l_orderkey,
		avg(o_totalprice) AS unit_price
	FROM
		lineitem_subquery,
		orders_subquery
	WHERE
		l_orderkey = o_orderkey
	GROUP BY
		l_orderkey) AS unit_prices;

-- Update metadata in order to make all shards equal
-- note that the table is created on multi_insert_select_create_table.sql
UPDATE 
	pg_dist_shard 
SET 
	shardmaxvalue = '14947' 
WHERE 
	shardid IN (SELECT shardid FROM pg_dist_shard WHERE logicalrelid = 'orders_subquery'::regclass ORDER BY shardid DESC LIMIT 1);

-- If group by is not on partition column then we error out from single table
-- repartition code path
SELECT
	avg(order_count)
FROM
	(SELECT
		l_suppkey,
		count(*) AS order_count
	FROM
		lineitem_subquery
	GROUP BY
		l_suppkey) AS order_counts;

-- Check that we error out if join is not on partition columns.
SELECT
	avg(unit_price)
FROM
	(SELECT
		l_orderkey,
		avg(o_totalprice / l_quantity) AS unit_price
	FROM
		lineitem_subquery,
		orders_subquery
	GROUP BY
		l_orderkey) AS unit_prices;

SELECT
	avg(unit_price)
FROM
	(SELECT
		l_orderkey,
		avg(o_totalprice / l_quantity) AS unit_price
	FROM
		lineitem_subquery,
		orders_subquery
	WHERE
		l_orderkey = o_custkey
	GROUP BY
		l_orderkey) AS unit_prices;

-- Check that we error out if there is non relation subqueries
SELECT count(*) FROM
(
   (SELECT l_orderkey FROM lineitem_subquery) UNION ALL
   (SELECT 1::bigint)
) b;


-- Check that we error out if queries in union do not include partition columns.

SELECT count(*) FROM
(
   (SELECT l_orderkey FROM lineitem_subquery) UNION
   (SELECT l_partkey FROM lineitem_subquery)
) b;

-- Check that we run union queries if partition column is selected.

SELECT count(*) FROM
(
   (SELECT l_orderkey FROM lineitem_subquery) UNION
   (SELECT l_orderkey FROM lineitem_subquery)
) b;
-- Check that we error out if inner query has Limit but subquery_pushdown is not set
SELECT
	avg(o_totalprice/l_quantity)
FROM
		(SELECT
			l_orderkey,
			l_quantity
		FROM
			lineitem_subquery
		ORDER BY
			l_quantity
		LIMIT 10
		) lineitem_quantities
	JOIN LATERAL
		(SELECT
			o_totalprice
		FROM
			orders_subquery
		WHERE
			lineitem_quantities.l_orderkey = o_orderkey) orders_price ON true;

-- Limit is only supported when subquery_pushdown is set
-- Check that we error out if inner query has limit but outer query has not.
SET citus.subquery_pushdown to ON;
SELECT
	avg(o_totalprice/l_quantity)
FROM
		(SELECT
			l_orderkey,
			l_quantity
		FROM
			lineitem_subquery
		ORDER BY
			l_quantity
		LIMIT 10
		) lineitem_quantities
	JOIN LATERAL
		(SELECT
			o_totalprice
		FROM
			orders_subquery
		WHERE
			lineitem_quantities.l_orderkey = o_orderkey) orders_price ON true;

-- reset the flag for next query
SET citus.subquery_pushdown to OFF;

-- Check that we error out if the outermost query is a distinct clause.

SELECT
	count(DISTINCT a)
FROM (
	SELECT
		count(*) a
	FROM
		lineitem_subquery
	GROUP BY
	   l_orderkey
) z;

-- Check supported subquery types.

SELECT
	o_custkey,
	sum(order_count) as total_order_count
FROM
	(SELECT
		o_orderkey,
		o_custkey,
		count(*) AS order_count
	FROM
		orders_subquery
	WHERE
		o_orderkey > 0 AND
		o_orderkey < 12000
	GROUP BY
		o_orderkey, o_custkey) AS order_counts
GROUP BY
	o_custkey
ORDER BY
	total_order_count DESC,
	o_custkey ASC
LIMIT 10;

SELECT
	avg(unit_price)
FROM
	(SELECT
		l_orderkey,
		avg(o_totalprice / l_quantity) AS unit_price
	FROM
		lineitem_subquery,
		orders_subquery
	WHERE
		l_orderkey = o_orderkey
	GROUP BY
		l_orderkey) AS unit_prices
WHERE
	unit_price > 1000 AND
	unit_price < 10000;

-- Check that if subquery is pulled, we don't error and run query properly.

SELECT count(*) FROM
(
	SELECT l_orderkey FROM (
		(SELECT l_orderkey FROM lineitem_subquery) UNION
		(SELECT l_orderkey FROM lineitem_subquery)
	) a
	WHERE l_orderkey = 1
) b;

SELECT count(*) FROM
(
	SELECT * FROM (
		(SELECT * FROM lineitem_subquery) UNION
		(SELECT * FROM lineitem_subquery)
	) a
	WHERE l_orderkey = 1
) b;

SELECT max(l_orderkey) FROM
(
	SELECT l_orderkey FROM (
		SELECT
			l_orderkey
		FROM
			lineitem_subquery
		WHERE
			l_orderkey < 20000
		GROUP BY
			l_orderkey
  ) z
) y;

-- Add one more shard to one relation, then test if we error out because of different
-- shard counts for joining relations.

SELECT master_create_empty_shard('orders_subquery') AS new_shard_id
\gset
UPDATE pg_dist_shard SET shardminvalue = 15000, shardmaxvalue = 20000
WHERE shardid = :new_shard_id;

SELECT
	avg(unit_price)
FROM
	(SELECT
		l_orderkey,
		avg(o_totalprice / l_quantity) AS unit_price
	FROM
		lineitem_subquery,
		orders_subquery
	WHERE
		l_orderkey = o_orderkey
	GROUP BY
		l_orderkey) AS unit_prices;

-- Check that we can prune shards in subqueries with VARCHAR partition columns

CREATE TABLE subquery_pruning_varchar_test_table
(
   a varchar,
   b int
);

SELECT master_create_distributed_table('subquery_pruning_varchar_test_table', 'a', 'hash');
SELECT master_create_worker_shards('subquery_pruning_varchar_test_table', 4, 1);

SET client_min_messages TO DEBUG2;

SELECT * FROM
	(SELECT count(*) FROM subquery_pruning_varchar_test_table WHERE a = 'onder' GROUP BY a)
AS foo;

SELECT * FROM
	(SELECT count(*) FROM subquery_pruning_varchar_test_table WHERE 'eren' = a GROUP BY a)
AS foo;

SET client_min_messages TO NOTICE;

-- test subquery join on VARCHAR partition column
SELECT * FROM
	(SELECT
		a_inner AS a
	FROM
		(SELECT
			subquery_pruning_varchar_test_table.a AS a_inner
		FROM
		 	subquery_pruning_varchar_test_table
		GROUP BY
		  	subquery_pruning_varchar_test_table.a
		HAVING
		  	count(subquery_pruning_varchar_test_table.a) < 3)
		AS f1,

		(SELECT
		 	subquery_pruning_varchar_test_table.a
		FROM
		  	subquery_pruning_varchar_test_table
		GROUP BY
		  	subquery_pruning_varchar_test_table.a
		HAVING
		  	sum(coalesce(subquery_pruning_varchar_test_table.b,0)) > 20.0)
		AS f2
	WHERE
		f1.a_inner = f2.a
	GROUP BY
		a_inner)
AS foo;

DROP TABLE subquery_pruning_varchar_test_table;

-- Simple join subquery pushdown
SELECT
	avg(array_length(events, 1)) AS event_average
FROM
	(SELECT
		tenant_id,
		user_id,
		array_agg(event_type ORDER BY event_time) AS events
	FROM
		(SELECT
			(users.composite_id).tenant_id,
			(users.composite_id).user_id,
			event_type,
			events.event_time
		FROM
			users,
			events
		WHERE
			(users.composite_id) = (events.composite_id) AND
			users.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			users.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
			event_type IN ('click', 'submit', 'pay')) AS subquery
	GROUP BY
		tenant_id,
		user_id) AS subquery;

-- Union and left join subquery pushdown
SELECT
	avg(array_length(events, 1)) AS event_average,
	hasdone
FROM
	(SELECT
		subquery_1.tenant_id,
		subquery_1.user_id,
		array_agg(event ORDER BY event_time) AS events,
		COALESCE(hasdone, 'Has not done paying') AS hasdone
	FROM
	(
		(SELECT
			(users.composite_id).tenant_id,
			(users.composite_id).user_id,
			(users.composite_id) as composite_id,
			'action=>1'AS event,
			events.event_time
		FROM
			users,
			events
		WHERE
			(users.composite_id) = (events.composite_id) AND
			users.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			users.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
			event_type = 'click')
		UNION
		(SELECT
			(users.composite_id).tenant_id,
			(users.composite_id).user_id,
			(users.composite_id) as composite_id,
			'action=>2'AS event,
			events.event_time
		FROM
			users,
			events
		WHERE
			(users.composite_id) = (events.composite_id) AND
			users.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			users.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
			event_type = 'submit')
	) AS subquery_1
	LEFT JOIN
	(SELECT
		DISTINCT ON ((composite_id).tenant_id, (composite_id).user_id) composite_id,
		(composite_id).tenant_id,
		(composite_id).user_id,
		'Has done paying'::TEXT AS hasdone
	FROM
		events
	WHERE
		events.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
		events.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
		event_type = 'pay') AS subquery_2
	ON
		subquery_1.composite_id = subquery_2.composite_id
	GROUP BY
		subquery_1.tenant_id,
		subquery_1.user_id,
		hasdone) AS subquery_top
GROUP BY
	hasdone
ORDER BY
    event_average DESC;

-- Union, left join and having subquery pushdown
SELECT
	avg(array_length(events, 1)) AS event_average,
	count_pay
	FROM (
  SELECT
	subquery_1.tenant_id,
	subquery_1.user_id,
	array_agg(event ORDER BY event_time) AS events,
	COALESCE(count_pay, 0) AS count_pay
  FROM
	(
		(SELECT
			(users.composite_id).tenant_id,
			(users.composite_id).user_id,
			(users.composite_id),
			'action=>1'AS event,
			events.event_time
		FROM
			users,
			events
		WHERE
			(users.composite_id) = (events.composite_id) AND
			users.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			users.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
			event_type = 'click')
		UNION
		(SELECT
			(users.composite_id).tenant_id,
			(users.composite_id).user_id,
			(users.composite_id),
			'action=>2'AS event,
			events.event_time
		FROM
			users,
			events
		WHERE
			(users.composite_id) = (events.composite_id) AND
			users.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			users.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
			event_type = 'submit')
	) AS subquery_1
	LEFT JOIN
		(SELECT
			(composite_id).tenant_id,
			(composite_id).user_id,
			composite_id,
			COUNT(*) AS count_pay
		FROM
			events
		WHERE
			events.composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			events.composite_id <= '(1, 9223372036854775807)'::user_composite_type AND
			event_type = 'pay'
		GROUP BY
			composite_id
		HAVING
			COUNT(*) > 2) AS subquery_2
	ON
		subquery_1.composite_id = subquery_2.composite_id
	GROUP BY
		subquery_1.tenant_id,
		subquery_1.user_id,
		count_pay) AS subquery_top
WHERE
	array_ndims(events) > 0
GROUP BY
	count_pay
ORDER BY
	count_pay;
	
-- Lateral join subquery pushdown
-- set subquery_pushdown since there is limit in the query
SET citus.subquery_pushdown to ON;
SELECT
	tenant_id,
	user_id,
	user_lastseen,
	event_array
FROM
	(SELECT
		tenant_id,
		user_id,
		max(lastseen) as user_lastseen,
		array_agg(event_type ORDER BY event_time) AS event_array
	FROM
		(SELECT
			(composite_id).tenant_id,
			(composite_id).user_id,
			composite_id,
			lastseen
		FROM
			users
		WHERE
			composite_id >= '(1, -9223372036854775808)'::user_composite_type AND
			composite_id <= '(1, 9223372036854775807)'::user_composite_type
		ORDER BY
			lastseen DESC
		LIMIT
			10
		) AS subquery_top
		LEFT JOIN LATERAL
			(SELECT
				event_type,
				event_time
			FROM
				events
			WHERE
				(composite_id) = subquery_top.composite_id
			ORDER BY
				event_time DESC
			LIMIT
				99) AS subquery_lateral
		ON
			true
		GROUP BY
			tenant_id,
			user_id
	) AS shard_union
ORDER BY
	user_lastseen DESC
LIMIT
	10;

-- cleanup the tables and the type & functions
-- also set the min messages to WARNING to skip
-- CASCADE NOTICE messagez
SET client_min_messages TO WARNING;
DROP TABLE users, events;

SELECT run_command_on_master_and_workers($f$
	
	DROP TYPE user_composite_type CASCADE;

$f$);

-- createed in multi_behavioral_analytics_create_table
DROP FUNCTION run_command_on_master_and_workers(p_sql text);

SET client_min_messages TO DEFAULT;

SET citus.subquery_pushdown to OFF;
SET citus.enable_router_execution TO 'true';