Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/9003#discussion_r42433365
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/functions.scala
---
@@ -842,3 +699,302 @@ object HyperLogLogPlusPlus {
)
// scalastyle:on
}
+
+abstract class CentralMomentAgg(child: Expression) extends
ImperativeAggregate with Serializable {
--- End diff --
Missing API doc. It is useful to cite the Wikipedia page. My version can be
find here: http://arxiv.org/abs/1510.04923.
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