viirya commented on a change in pull request #29983:
URL: https://github.com/apache/spark/pull/29983#discussion_r502868488
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2342,6 +2342,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_CENTRAL_MOMENT_AGG =
+ buildConf("spark.sql.legacy.centralMomentAgg")
+ .internal()
+ .doc("When set to true, central moment aggregation will return
Double.NaN " +
+ "if divide by zero occurred during calculation. " +
+ "Otherwise, it will return null")
Review comment:
Can we describe the Spark version of this legacy behavior? E.g., In what
versions it returns NaN.
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