Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/10218#issuecomment-163797608
I see. I added this as `sort`, `cube`, `select` and etc do the same thing
for supporting it by name and expression. Although I am not greatly insightful
for this DataFrame APIs, I feel like some users would feel it is inconsistent
if most APIs support this by name and expression but this does not.
Also, I think this might not be so complicated. I just added a loop and
made `drop(col: Column)` call this but I accept that this might look
complicated (in terms of readability).
So, it looks like consistency vs readability for me.
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