def _dict_mixed_empty_parser(v, v_delimiter):
    """
    Parse a value into the appropriate form, for a mixed value based column.

    Args:
        v: The raw string value parsed from a column.
        v_delimiter: The delimiter between components of the value.

    Returns:
        The parsed value, which can either be None in the case of no
        corresponding value, or a set of the components in the value.
    """
    if v is None:
        return v

    vs = set(v.split(v_delimiter))
    return vs