QUERY PLAN
GroupAggregate (cost=60.97..61.15 rows=9 width=12)
Group Key: parent_id
-> Sort (cost=60.97..61.00 rows=13 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.73 rows=13 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1641,1647,1687,1686,1652,1684,1683,1347,1358}'::integer[])))