QUERY PLAN
GroupAggregate (cost=52.69..52.76 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=52.69..52.70 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.65 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1535,1672,1667}'::integer[])))