Github user shivaram commented on the pull request:

    https://github.com/apache/spark/pull/11318#issuecomment-215236672
  
    Thanks @olarayej for updating this. I think the code looks good. The only 
thing I'm not sure of is the default value for `[` - I see that you have gone 
through SparkR's internal code base to add `drop = F`. The reason I prefer keep 
`drop=F` as the default is that I'm not sure if we have missed some place where 
we use `[`. While I see the argument that its the default in normal R, I feel 
like it might not be worth changing the default if we'll run into other 
unexpected bugs.


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