QUERY PLAN
GroupAggregate (cost=109.56..109.58 rows=1 width=12)
Group Key: case_id
-> Sort (cost=109.56..109.57 rows=1 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..109.55 rows=1 width=4)
Filter: ((created_by = 1000) AND (case_id = ANY ('{8667,8598,8553,8565,8564,8329,8273,8189,8190,8171}'::integer[])))