QUERY PLAN
GroupAggregate (cost=108.84..108.86 rows=1 width=12)
Group Key: case_id
-> Sort (cost=108.84..108.85 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..108.83 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{9270,9271,9272,9273,9274,9275,9276,9277}'::integer[])))