Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/9489#issuecomment-155244366
@mengxr possibly.. though there are usage difference with SparkR
DataFrame/Column as compared to R data.frame (eg. `agg` vs
[`aggregate`](https://stat.ethz.ch/R-manual/R-devel/library/stats/html/aggregate.html),
`var(faithful$eruptions)` would have been a Column with DataFrame)
It might be more confusing.
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