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 ('{8267,8264,8268,8266,8265,5051,8263,8262,8260,8246,8256,8257,8249,8215,8252,8259,8250,8258,8247,8255}'::integer[]))