hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Alexander Pivovarov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9858) Create cbrt (cube root) UDF
Date Mon, 16 Mar 2015 18:01:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14363611#comment-14363611
] 

Alexander Pivovarov commented on HIVE-9858:
-------------------------------------------

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



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message