QUERY PLAN
GroupAggregate (cost=56.03..56.31 rows=14 width=12)
Group Key: parent_id
-> Sort (cost=56.03..56.08 rows=19 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..55.62 rows=19 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1727,1726,1724}'::integer[])))