QUERY PLAN
GroupAggregate (cost=64.30..64.62 rows=15 width=12)
Group Key: parent_id
-> Sort (cost=64.30..64.35 rows=23 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.78 rows=23 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1686,1641,1652,1697,1696,1687,1684,1683}'::integer[])))