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https://issues.apache.org/jira/browse/HIVE-9857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14363585#comment-14363585
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Alexander Pivovarov commented on HIVE-9857:
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The function description was added to hive wiki.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-MathematicalFunctions
> Create Factorial UDF
> --------------------
>
> Key: HIVE-9857
> URL: https://issues.apache.org/jira/browse/HIVE-9857
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Reporter: Alexander Pivovarov
> Assignee: Alexander Pivovarov
> Fix For: 1.2.0
>
> Attachments: HIVE-9857.1.patch, HIVE-9857.2.patch, HIVE-9857.3.patch
>
>
> Function signature: factorial(int a): bigint
> For example 5!= 5*4*3*2*1=120
> {code}
> select factorial(5);
> OK
> 120
> {code}
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