QUERY PLAN
HashAggregate (cost=60.72..60.87 rows=15 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.60 rows=25 width=4)
Filter: (parent_id = ANY ('{1565,1596,1686,1647,1668,1578,1577,1576,1566,1562}'::integer[]))