QUERY PLAN
GroupAggregate (cost=67.14..67.32 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=67.14..67.17 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..66.95 rows=11 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1688,1702,1701,1694,1693,1692,1691,1690,1689,1651,1650,1648}'::integer[])))