QUERY PLAN
GroupAggregate (cost=98.50..98.52 rows=1 width=12)
Group Key: case_id
-> Sort (cost=98.50..98.50 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..98.49 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{9259,9256,9255}'::integer[])))