QUERY PLAN
GroupAggregate (cost=63.93..64.22 rows=14 width=12)
Group Key: parent_id
-> Sort (cost=63.93..63.98 rows=20 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.50 rows=20 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1686,1647,1687,1672,1669,1668,1667,1662,1661,1580}'::integer[])))