QUERY PLAN
GroupAggregate (cost=98.45..98.47 rows=1 width=12)
Group Key: case_id
-> Sort (cost=98.45..98.45 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..98.44 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{8250,8258,8255,8253,8245,8248}'::integer[])))