QUERY PLAN
GroupAggregate (cost=54.01..54.09 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=54.01..54.02 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..53.95 rows=5 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1535,1662,1661,1667,1669}'::integer[])))