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https://issues.apache.org/jira/browse/SPARK-11720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003589#comment-15003589
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Jihong MA commented on SPARK-11720:
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Also, for mean, we treat Decimal differently vs. other numeric type, all other
numeric type all converted to Double, for Decimal type, we continue to keep its
type but increase its p/s to avoid precison loss. so for types that converted
to Double, we can return Double.NaN, for decimal type, we can't return a double
value but still null?
> Return Double.NaN instead of null for Mean and Average when count = 0
> ---------------------------------------------------------------------
>
> Key: SPARK-11720
> URL: https://issues.apache.org/jira/browse/SPARK-11720
> Project: Spark
> Issue Type: Sub-task
> Reporter: Jihong MA
>
> change the default behavior of mean in case of count = 0 from null to
> Double.NaN, to make it inline with all other univariate stats function.
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