QUERY PLAN
GroupAggregate (cost=98.61..98.63 rows=1 width=12)
Group Key: case_id
-> Sort (cost=98.61..98.62 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..98.60 rows=1 width=4)
Filter: ((created_by = 1015) AND (case_id = ANY ('{9244,9233,9230}'::integer[])))