QUERY PLAN
GroupAggregate (cost=62.00..62.28 rows=13 width=12)
Group Key: parent_id
-> Sort (cost=62.00..62.05 rows=19 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.60 rows=19 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1687,1686,1596,1641,1647,1652,1697,1696,1684,1683}'::integer[])))