cloud-fan commented on a change in pull request #29983:
URL: https://github.com/apache/spark/pull/29983#discussion_r503035473
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala
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@@ -174,7 +175,9 @@ case class StddevSamp(child: Expression) extends
CentralMomentAgg(child) {
override val evaluateExpression: Expression = {
If(n === 0.0, Literal.create(null, DoubleType),
- If(n === 1.0, Double.NaN, sqrt(m2 / (n - 1.0))))
+ If(n === 1.0,
+ if (SQLConf.get.legacyCentralMomentAgg) Double.NaN else
Literal.create(null, DoubleType),
Review comment:
can we put it as a method in the parent class `CentralMomentAgg`?
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