code: def get_quoted_columns(self, platform):
          
          columns = []
  
          for column in self._columns.values():
              columns.append(column.get_quoted_name(platform))
  
          return columns
docs: Returns the quoted representation of the column names
          the constraint is associated with.
  
          But only if they were defined with one or a column name
          is a keyword reserved by the platform.
          Otherwise the plain unquoted value as inserted is returned.
  
          :param platform: The platform to use for quotation.
          :type platform: Platform
  
          :rtype: list