MySQL ストレージから生成された列を追加するようにテーブルを変更するにはどうすればよいでしょうか?

ALTER TABLE table_name
ADD COLUMN column_name AS(expression)STORED;

mysql> ALTER TABLE employee_data_stored ADD COLUMN FULLName Varchar(200) AS (CONCAT_WS(" ", 'First_name','Last_name')) STORED;
Query OK, 2 rows affected (1.23 sec)
Records: 2 Duplicates: 0 Warnings: 0

mysql> Describe employee_data_stored;
+------------+--------------+------+-----+---------+------------------+
| Field      | Type         | Null | Key | Default | Extra            |
+------------+--------------+------+-----+---------+------------------+
| ID         | int(11)      | NO   | PRI | NULL    | auto_increment   |
| First_name | varchar(50)  | NO   |     | NULL    |                  |
| Last_name  | varchar(50)  | NO   |     | NULL    |                  |
| FULL_NAME  | varchar(90)  | YES  |     | NULL    | STORED GENERATED |
| FULLName   | varchar(200) | YES  |     | NULL    | STORED GENERATED |
+------------+--------------+------+-----+---------+------------------+
5 rows in set (0.00 sec)