QUERY PLAN
GroupAggregate (cost=54.94..55.02 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=54.94..54.95 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.88 rows=5 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1644,1641,1631,1630,1629}'::integer[])))