QUERY PLAN
HashAggregate (cost=60.73..60.89 rows=16 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.60 rows=26 width=4)
Filter: (parent_id = ANY ('{1596,1641,1647,1696,1686,1652,1697,1687,1684,1683}'::integer[]))