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 ('{1596,1647,1734,1740,1727,58,63,76,67,64}'::integer[]))