QUERY PLAN
GroupAggregate (cost=54.07..54.16 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=54.07..54.09 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.02 rows=5 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1813,1834,1835,1837}'::integer[])))