QUERY PLAN
GroupAggregate (cost=52.37..52.47 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=52.37..52.39 rows=6 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.30 rows=6 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1734,1768}'::integer[])))