QUERY PLAN
HashAggregate (cost=60.47..60.64 rows=17 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.35 rows=25 width=4)
Filter: (parent_id = ANY ('{1565,1596,1641,1686,1647,1696,1668,1578,1577,1576}'::integer[]))