Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/9489#issuecomment-155516128
Yeah in that case lets add aliases for `sd` and `var` as well and match the
population/sample behavior.
@felixcheung I think similar functions like `mean` don't match base R data
frame but they are useful when used inside an expression and so its fine to
have aliases for this.
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