QUERY PLAN
GroupAggregate (cost=53.14..53.36 rows=11 width=12)
Group Key: parent_id
-> Sort (cost=53.14..53.18 rows=14 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.88 rows=14 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1727,1724}'::integer[])))