Github user shea-parkes commented on the issue:

    https://github.com/apache/spark/pull/16094
  
    Gah, I'm sorry.  I forgot python 2.6 compatibility.  I'll switch this over 
shortly to use the old-school style.  Likely do something like this:
    
    ```python
    def alias(self, *alias, **kwargs):
        metadata = kwargs.pop('metadata', None)
        assert not kwargs
    ```
    
    I'll also add some unit tests and raise a more proper exception (if I can 
find one).
    
    Sorry again.


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