QUERY PLAN
GroupAggregate (cost=102.41..102.59 rows=10 width=12)
Group Key: case_id
-> Sort (cost=102.41..102.44 rows=10 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..102.25 rows=10 width=4)
Filter: (case_id = ANY ('{8249,5051,8262,8214,8272,8263,8215,8247,8232,8231}'::integer[]))