QUERY PLAN
GroupAggregate (cost=106.06..106.08 rows=1 width=12)
Group Key: case_id
-> Sort (cost=106.06..106.07 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..106.05 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{8277,8260,8274,8273,8246,8272,8271,8267,8264,8263}'::integer[])))