QUERY PLAN
GroupAggregate (cost=56.41..56.55 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=56.41..56.43 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..56.27 rows=9 width=4)
Filter: (parent_id = ANY ('{1693,1688,1692,1691,1690,1689,1651,1650,1648}'::integer[]))