QUERY PLAN
GroupAggregate (cost=61.58..61.93 rows=17 width=12)
Group Key: parent_id
-> Sort (cost=61.58..61.64 rows=24 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..61.02 rows=24 width=4)
Filter: (parent_id = ANY ('{1586,1596,1641,1647,1652,1683,1684,1686,1687,1696}'::integer[]))