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 ('{8763,8693,8762,8761,8760,8758,8759,8754,8751,8755}'::integer[]))