@staticmethod
def prepare_group_by_item(item):
    """Prepare group by list item.

        Convert replaces any special "dimensions#", "meta#" or "value_meta#" occurrences into
        spark sql syntax to retrieve data from extra_data_map column.
        """
    if item.startswith('dimensions#') or item.startswith('meta#'
        ) or item.startswith('value_meta#'):
        return '.'.join(('extra_data_map', item))
    else:
        return item
