QUERY PLAN
GroupAggregate (cost=57.85..57.96 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=57.85..57.87 rows=7 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.75 rows=7 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1671,1670,1669,1668,1667,1666,1664,1658}'::integer[])))