Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/8920#issuecomment-144621929
I think @sun-rui does have a point here. Generally in R, `sort` is for list
& vector
https://stat.ethz.ch/R-manual/R-devel/library/base/html/sort.html
But for data.frame, `order` is used (in base) (or `arrange` in dplyr)
http://stackoverflow.com/questions/1296646/how-to-sort-a-dataframe-by-columns
http://www.cookbook-r.com/Manipulating_data/Sorting/
http://www.dummies.com/how-to/content/how-to-sort-data-frames-in-r.html
And IMO ordering with Column is actually more R-like
```
df[ order(df$weight, decreasing=TRUE), ]
df[ order(-df$weight), ]
```
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