QUERY PLAN
GroupAggregate (cost=63.85..64.15 rows=15 width=12)
Group Key: parent_id
-> Sort (cost=63.85..63.90 rows=19 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.45 rows=19 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1641,1647,1683,1684,1686,1687,1696,1697,1734,1735}'::integer[])))