QUERY PLAN
GroupAggregate (cost=60.29..60.47 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=60.29..60.32 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.10 rows=11 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1566,1576,1577,1578,1596,1668,1686,1734}'::integer[])))