QUERY PLAN
GroupAggregate (cost=54.48..54.55 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=54.48..54.49 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..54.44 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1724,1726,1725,1720,1719}'::integer[])))