QUERY PLAN
GroupAggregate (cost=54.32..54.42 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=54.32..54.34 rows=6 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.24 rows=6 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1713,1712,1711,1620}'::integer[])))