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 ('{1684,1683,1671,1670,1652,1647,1641,1596,1426,1359}'::integer[])))