QUERY PLAN
HashAggregate (cost=60.48..60.65 rows=17 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.35 rows=26 width=4)
Filter: (parent_id = ANY ('{1596,1687,1696,1686,1641,1647,1652,1697,1684,1683}'::integer[]))