QUERY PLAN
GroupAggregate (cost=58.66..58.79 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=58.66..58.68 rows=8 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..58.54 rows=8 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1658,1664,1666,1667,1668,1669,1670,1671}'::integer[])))