QUERY PLAN
GroupAggregate (cost=54.84..54.92 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=54.84..54.85 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.78 rows=5 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1667,1669,1668,1664,1658,1666}'::integer[])))