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https://issues.apache.org/jira/browse/HIVE-9858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14363611#comment-14363611
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Alexander Pivovarov commented on HIVE-9858:
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The function description was added to hive wiki.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-MathematicalFunctions
> Create cbrt (cube root) UDF
> ---------------------------
>
> Key: HIVE-9858
> URL: https://issues.apache.org/jira/browse/HIVE-9858
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Reporter: Alexander Pivovarov
> Assignee: Alexander Pivovarov
> Fix For: 1.2.0
>
> Attachments: HIVE-9858.1.patch, HIVE-9858.1.patch, HIVE-9858.2.patch
>
>
> returns the cube root of a double value
> cbrt(double a) : double
> For example:
> {code}
> select cbrt(87860583272930481.0);
> OK
> 444561.0
> {code}
> I noticed that Math.pow(a, 1.0/3.0) and hive power UDF return
> 444560.99999999965 for the example above.
> However Math.cbrt returns 444561.0
> This is why we should have hive cbrt function in hive
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