QUERY PLAN
GroupAggregate (cost=47.67..47.76 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=47.67..47.68 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..47.61 rows=5 width=4)
Filter: (parent_id = ANY ('{1674,1675}'::integer[]))