QUERY PLAN
GroupAggregate (cost=64.21..64.49 rows=13 width=12)
Group Key: parent_id
-> Sort (cost=64.21..64.26 rows=20 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.78 rows=20 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1647,1719,1672,1669,1668,1667,1662,1661,1580,1578}'::integer[])))