QUERY PLAN
GroupAggregate (cost=112.94..112.96 rows=1 width=12)
Group Key: case_id
-> Sort (cost=112.94..112.94 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..112.93 rows=1 width=4)
Filter: ((created_by = 1001) AND (case_id = ANY ('{9255,9256,9263,9264,9265,9266,9267,9268,9269,9270}'::integer[])))