QUERY PLAN
GroupAggregate (cost=87.04..87.07 rows=2 width=12)
Group Key: case_id
-> Sort (cost=87.04..87.04 rows=2 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..87.03 rows=2 width=4)
Filter: (case_id = ANY ('{8263,8262}'::integer[]))