QUERY PLAN
GroupAggregate (cost=121.70..122.05 rows=20 width=12)
Group Key: case_id
-> Sort (cost=121.70..121.75 rows=20 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..121.27 rows=20 width=4)
Filter: (case_id = ANY ('{8280,8279,8277,8278,8276,8274,8272,8273,8271,8270,8267,8266,8265,8264,8262,8263,8256,8258,8255,8250}'::integer[]))