maropu commented on a change in pull request #29983:
URL: https://github.com/apache/spark/pull/29983#discussion_r502376968
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2775,6 +2775,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_CENTRAL_MOMENT_AGG_BEHAVIOR =
+ buildConf("spark.sql.legacy.centralMomentAgg.enabled")
+ .internal()
+ .doc("When set to true, stddev_samp and var_samp will return Double.NaN,
" +
+ "if applied to a set with a single element. Otherwise, will return
0.0, " +
+ "which is aligned with TPCDS standard.")
Review comment:
I think we don't need to describe `which is aligned with TPCDS
standard.` here for user documents.
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