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https://issues.apache.org/jira/browse/HIVE-16178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15905852#comment-15905852
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Zoltan Haindrich commented on HIVE-16178:
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HIVE-15978 will contain a disabled testcase for this problem
> corr UDAF standard compliance
> -----------------------------
>
> Key: HIVE-16178
> URL: https://issues.apache.org/jira/browse/HIVE-16178
> Project: Hive
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zoltan Haindrich
> Priority: Minor
>
> the standard defines corner cases when it should return null - but the
> current result is NaN.
> If N * SUMX2 equals SUMX * SUMX , then the result is the null value.
> and
> If N * SUMY2 equals SUMY * SUMY , then the result is the null value.
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