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 ('{8264,8267,8266,8265,5051,8263,8262,8260,8246,8256}'::integer[]))