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 ('{8268,8231,8243,8212,8176,8179,8178,8182,7981,7987}'::integer[]))