GAUSS-51214：The number of capacity expansion DN nodes cannot be less than three or CN nodes cannot be less than one. SQLSTATE: 无
错误码
错误描述：The number of capacity expansion DN nodes cannot be less than three or CN nodes cannot be less than one. SQLSTATE: 无
错误原因：扩容前的节点数不能少于3个。
解决方法：确保扩容前的节点数大于等于三个。
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