MySQL服务器版本，可在'varchar（200））AS行问题附近使用正确的语法

Question

mysql显示以下查询的以下问题

错误是：

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'varchar(200)) AS row From #__categories Union all Select id, title' at line 3

查询：

With cte 
        As
        (Select id, title,patern_id, Cast(row_number() over (order by id) AS varchar(200)) AS row
        From #__categories

        Union all

        Select id, title,patern_id,cte.row + Cast(row_number() over (order by id) as varchar(200)) as row
        From #__categories a
        Join cte c on (a.patern_id =c.id)
        )

        Select *

        From cte
        Order by row

有人可以告诉我什么是problam吗？

mysql版本：8.0.15

php：7.3.2