Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13403
What about just adding an explicit note on old `StatCounter.stdev`?
http://spark.apache.org/docs/2.0.0-preview/api/scala/index.html#org.apache.spark.util.StatCounter
MLLIB `stat.Statistics` is also consistent with `Dataset`.
```
scala> import org.apache.spark.mllib.linalg.Vectors
scala> import org.apache.spark.mllib.stat.{MultivariateStatisticalSummary,
Statistics}
scala>
Statistics.colStats(sc.parallelize(Seq(Vectors.dense(1.0),Vectors.dense(2.0),Vectors.dense(3.0)))).variance
res10: org.apache.spark.mllib.linalg.Vector = [1.0]
```
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