QUERY PLAN
GroupAggregate (cost=56.47..56.58 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=56.47..56.49 rows=7 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..56.37 rows=7 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1584,1596,1644,1641,1631,1630,1629}'::integer[])))