QUERY PLAN
GroupAggregate (cost=100.66..100.68 rows=1 width=12)
Group Key: case_id
-> Sort (cost=100.66..100.66 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..100.65 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{9255,9256,9259,9263}'::integer[])))