def RowKey(self):
        """
        Returns:
            (string): 此RowMutation对象的rowkey，例如可用在回调中
        """
        value = POINTER(c_ubyte)()
        vallen = c_uint64()
        lib.tera_row_mutation_rowkey(self.mutation,
                                     byref(value), byref(vallen))
        return copy_string_to_user(value, long(vallen.value))