修改已有列，列名为关键字时，关键字检查 bug

[Graywd]

描述
修改已有的列信息，如果列名是关键字，对于已有列不应该检查列名，但实际会检查

重现

[hanchuanchuan]

好的, 稍后会优化该逻辑.

[stale]

由于此问题没有最近的活动，因此已被自动标记为陈旧。如果没有进一步的活动，会作为不活跃issue关闭。感谢你对本项目的贡献。 This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.