Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12185#discussion_r59122216
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala
---
@@ -157,6 +161,8 @@ case class StddevSamp(child: Expression) extends
CentralMomentAgg(child) {
}
// Compute the population variance of a column
+@ExpressionDescription(
+ usage = "_FUNC_(x) - Returns the variance of a set of numbers.")
--- End diff --
population variance
---
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