Modify column to change its length or nullability
修改列以更改其长度或可为空特性
The nullability characteristics of each column must be the same.
每列的为空性（nullability）特征必须相同。
Therefore, it is very important for the remote table definition to include column nullability.
因此，远程表的定义允许列可以为空这一点非常重要。
Therefore, it is very important for the remote table definition to include column nullability.
因此，远程表的定义允许列可以为空这一点非常重要。
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