QUERY PLAN
GroupAggregate (cost=64.27..64.57 rows=14 width=12)
Group Key: parent_id
-> Sort (cost=64.27..64.32 rows=22 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.78 rows=22 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1565,1596,1686,1647,1668,1578,1577,1576,1566,1562}'::integer[])))