Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12185#discussion_r59122207
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala
---
@@ -130,6 +130,8 @@ abstract class CentralMomentAgg(child: Expression)
extends DeclarativeAggregate
}
// Compute the population standard deviation of a column
+@ExpressionDescription(
+ usage = "_FUNC_(x) - Returns the standard deviation of a set of
numbers.")
--- End diff --
Let's mention that this is population standard deviation.
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