QUERY PLAN
GroupAggregate (cost=54.87..55.10 rows=12 width=12)
Group Key: parent_id
-> Sort (cost=54.87..54.91 rows=15 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.58 rows=15 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1647,1727,1724}'::integer[])))