def _construct_result(left, result, index, name, dtype):
    """
    If the raw op result has a non-None name (e.g. it is an Index object) and
    the name argument is None, then passing name to the constructor will
    not be enough; we still need to override the name attribute.
    """
    out = left._constructor(result, index=index, dtype=dtype)
    out.name = name
    return out
