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https://issues.apache.org/jira/browse/HIVE-16178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925545#comment-15925545
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Ashutosh Chauhan commented on HIVE-16178:
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This needs to be fixed. Currently returning wrong results.
> corr/covar_samp 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
>
> h3. corr
> 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.
> h3. covar_samp
> returns 0 instead 1
> `If N is 1 (one), then the result is the null value.`
> h3. check (x,y) vs (y,x) args in docs
> the standard uses (y,x) order; and some of the function names are also
> contain X and Y...so the order does matter..currently at least corr uses
> (x,y) order which is okay - because its symmetric; but it would be great to
> have the same order everywhere (check others)
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