QUERY PLAN
GroupAggregate (cost=60.80..61.12 rows=16 width=12)
Group Key: parent_id
-> Sort (cost=60.80..60.85 rows=22 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=22 width=4)
Filter: (parent_id = ANY ('{1641,1647,1683,1684,1686,1687,1696,1697,1734,1735}'::integer[]))