QUERY PLAN
GroupAggregate (cost=64.71..65.02 rows=15 width=12)
Group Key: parent_id
-> Sort (cost=64.71..64.76 rows=21 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..64.25 rows=21 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1686,1641,1652,1697,1723,1696,1687,1684}'::integer[])))