QUERY PLAN
GroupAggregate (cost=102.26..102.28 rows=1 width=12)
Group Key: case_id
-> Sort (cost=102.26..102.26 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..102.25 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{8280,8279,8264,8262,8273,8272,8271,8263}'::integer[])))