QUERY PLAN
GroupAggregate (cost=50.93..51.00 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=50.93..50.94 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..50.89 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1687,1696}'::integer[])))