QUERY PLAN
GroupAggregate (cost=60.83..61.17 rows=17 width=12)
Group Key: parent_id
-> Sort (cost=60.83..60.88 rows=23 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=23 width=4)
Filter: (parent_id = ANY ('{1586,1596,1641,1647,1683,1684,1686,1687,1696,1697}'::integer[]))