Github user felixcheung commented on the issue:

    https://github.com/apache/spark/pull/15231
  
    Hmm, should we hold till 12601 is merged then? Seems like we shouldn't 
allow this unless internal datasources are supporting this more broadly.
    
    Also, before the path parameter type is in the signature, ie.
    ```
    write.df(df, c(1, 2))
    ```
    Would error with some descriptive error, with this change it would get some 
JVM exception which seems to degrade the experience a bit.
    Could you add checks for `path` and give more descriptive message?


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