QUERY PLAN
GroupAggregate (cost=53.41..53.53 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=53.41..53.43 rows=8 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..53.29 rows=8 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1641,1647,1652,1687}'::integer[])))