QUERY PLAN
GroupAggregate (cost=57.63..57.92 rows=14 width=12)
Group Key: parent_id
-> Sort (cost=57.63..57.68 rows=20 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.20 rows=20 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1734,1741,1740,1727}'::integer[])))