QUERY PLAN
GroupAggregate (cost=56.51..56.76 rows=13 width=12)
Group Key: parent_id
-> Sort (cost=56.51..56.55 rows=16 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..56.19 rows=16 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1735,1734,1727}'::integer[])))