QUERY PLAN
GroupAggregate (cost=60.04..60.20 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=60.04..60.07 rows=10 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..59.88 rows=10 width=4)
Filter: (parent_id = ANY ('{1772,1769,1768,1754,1751,1746,1735,1734,1723,1697}'::integer[]))