Github user sun-rui commented on the pull request:

    https://github.com/apache/spark/pull/9785#issuecomment-157648957
  
    I am not sure if it makes sense to match SparkR functions to R signatures 
of same name to avoid name conflict in the case that SparkR functions have 
different semantic from R. Is it a convenience to R users or a confusion?
    for example, 
    ```
     setMethod("lag",
              signature(x = "characterOrColumn"),
    ```
    This will interfere with a call to base lag(), where x is of type character.


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