QUERY PLAN
GroupAggregate (cost=61.98..62.23 rows=12 width=12)
Group Key: parent_id
-> Sort (cost=61.98..62.02 rows=18 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.60 rows=18 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1565,1596,1641,1686,1647,1696,1668,1578,1577,1576}'::integer[])))