Jihong MA created SPARK-11720:
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Summary: 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: Improvement
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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