QUERY PLAN
GroupAggregate (cost=59.65..59.98 rows=16 width=12)
Group Key: parent_id
-> Sort (cost=59.65..59.70 rows=23 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..59.12 rows=23 width=4)
Filter: (parent_id = ANY ('{1586,1596,1641,1647,1652,1683,1684,1686,1687,1696}'::integer[]))