code: def has_column_at_position(self, column_name, pos=0):
          
          column_name = self._trim_quotes(column_name.lower())
          index_columns = [c.lower() for c in self.get_unquoted_columns()]
  
          return index_columns.index(column_name) == pos
docs: :type column_name: str
          :type pos: int
  
          :rtype: bool