Github user actuaryzhang commented on the issue:

    https://github.com/apache/spark/pull/18025
  
    @felixcheung Thanks for your feedback. 
    - This does not affect discoverability: the name of the method is still on 
the index list 
    - No problem with help either, e.g., one can use `?avg`. 
    
    
![image](https://cloud.githubusercontent.com/assets/11082368/26232656/945b3afe-3c0c-11e7-8c17-fa8df5e4ee2e.png)
    
    Another benefit is that we can get rid of most warnings on no examples 
since we now document all the tiny functions together. 
    
    I think it is important and the change is straightforward. However, this is 
a pretty manual (and big) change. I would like to get a `Yes` from you for 
doing this. Thanks.  


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