QUERY PLAN
GroupAggregate (cost=62.71..63.02 rows=15 width=12)
Group Key: parent_id
-> Sort (cost=62.71..62.76 rows=21 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..62.25 rows=21 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1586,1596,1641,1647,1652,1683,1684,1686,1687,1696}'::integer[])))