QUERY PLAN
GroupAggregate (cost=50.79..50.88 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=50.79..50.81 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..50.73 rows=5 width=4)
Filter: ((parent_id = ANY ('{1596,1734}'::integer[])) AND (status = 1))