code: def _update_options(model, connection=None):
      
      ks_name = model._get_keyspace()
      msg = format_log_context("Checking %s for option differences", keyspace=ks_name, connection=connection)
      log.debug(msg, model)
      model_options = model.__options__ or {}
  
      table_meta = _get_table_metadata(model, connection=connection)
      # go to CQL string first to normalize meta from different versions
      existing_option_strings = set(table_meta._make_option_strings(table_meta.options))
      existing_options = _options_map_from_strings(existing_option_strings)
      model_option_strings = metadata.TableMetadataV3._make_option_strings(model_options)
      model_options = _options_map_from_strings(model_option_strings)
  
      update_options = {}
      for name, value in model_options.items():
          try:
              existing_value = existing_options[name]
          except KeyError:
              msg = format_log_context("Invalid table option: '%s'; known options: %s", keyspace=ks_name, connection=connection)
              raise KeyError(msg % (name, existing_options.keys()))
          if isinstance(existing_value, six.string_types):
              if value != existing_value:
                  update_options[name] = value
          else:
              try:
                  for k, v in value.items():
                      if existing_value[k] != v:
                          update_options[name] = value
                          break
              except KeyError:
                  update_options[name] = value
  
      if update_options:
          options = ' AND '.join(metadata.TableMetadataV3._make_option_strings(update_options))
          query = "ALTER TABLE {0} WITH {1}".format(model.column_family_name(), options)
          execute(query, connection=connection)
          return True
  
      return False
docs: Updates the table options for the given model if necessary.
  
      :param model: The model to update.
      :param connection: Name of the connection to use
  
      :return: `True`, if the options were modified in Cassandra,
          `False` otherwise.
      :rtype: bool