Github user yu-iskw commented on the pull request:

    https://github.com/apache/spark/pull/8194#issuecomment-131648983
  
    @shivaram could you review it?
    
    - Define `lit` as a S4 function
    - Add the functions into the NAMESPACE file
    - Remove the unnecessary generic for `struct`
    
    I have a question about `column` and `col` function in SparkR. Should we 
define them as S4 functions? They are currently defined as S3 functions.


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