QUERY PLAN
GroupAggregate (cost=88.95..89.00 rows=3 width=12)
Group Key: case_id
-> Sort (cost=88.95..88.96 rows=3 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..88.93 rows=3 width=4)
Filter: (case_id = ANY ('{8264,8263,8262}'::integer[]))