QUERY PLAN
GroupAggregate (cost=46.63..46.67 rows=2 width=12)
Group Key: parent_id
-> Sort (cost=46.63..46.64 rows=2 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..46.62 rows=2 width=4)
Filter: (parent_id = ANY ('{1757,1756}'::integer[]))