Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/9489#issuecomment-155362135
@shivaram, I looked at dplyr package, there is no "sd", "var" defined in
the package, seems the page is referencing "sd" "var" in R base.
Yes, stddev/variance agg functions we are adding have similar syntax as
"sd" and "var" in R, as you can think of a Column as a vector of same type. So
we'd better add aliases for them.
Note that var() in R computes sample variance (I think "sd" also uses
sample variance, but not verified) instead of population variance.
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