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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def is_sqlatype_text_of_length_at_least( coltype: Union[TypeEngine, VisitableType], min_length: int = 1000) -> bool: """ Is the SQLAlchemy column type a string type that's at least the specified length? """

    coltype = _coltype_to_typeengine(coltype)
    if not isinstance(coltype, sqltypes.String):
        return False  # not a string/text type at all
    if coltype.length is None:
        return True  # string of unlimited length
    return coltype.length >= min_length