QUERY PLAN
GroupAggregate (cost=92.74..92.76 rows=1 width=12)
Group Key: case_id
-> Sort (cost=92.74..92.75 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..92.73 rows=1 width=4)
Filter: ((created_by = 5016) AND (case_id = ANY ('{8264,8263,8262}'::integer[])))