QUERY PLAN
GroupAggregate (cost=105.76..105.94 rows=10 width=12)
Group Key: case_id
-> Sort (cost=105.76..105.79 rows=10 width=4)
Sort Key: case_id
-> Seq Scan on tbl_pre_sales (cost=0.00..105.59 rows=10 width=4)
Filter: (case_id = ANY ('{8667,8598,8553,8565,8564,8329,8273,8189,8190,8171}'::integer[]))