QUERY PLAN
GroupAggregate (cost=46.68..46.77 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=46.68..46.70 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..46.62 rows=5 width=4)
Filter: (parent_id = ANY ('{1713,1767}'::integer[]))