Tinyint type data overflow when insert value

Steps to reproduce the behavior:

1. create table:
   CREATE TABLE val (
   k1 tinyint NOT NULL COMMENT "",
   v1 tinyint SUM NOT NULL COMMENT ""
   ) ENGINE=OLAP
   AGGREGATE KEY(k1)
   DISTRIBUTED BY HASH(k1) BUCKETS 5
   PROPERTIES (
   "storage_type" = "COLUMN"
   );
2. insert into val(k1, v1) values(200, 10);
3. select * from val;