def METHOD_NAME(cls, text: str, nullable: bool = True) -> DataType:
    """Convert a backend-specific string representation into an Ibis DataType.
    Parameters
    ----------
    text
        The backend-specific string representation to convert.
    nullable
        Whether the Ibis DataType should be nullable.
    Returns
    -------
    Ibis DataType.
    """
    raise NotImplementedError