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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-656) Add a POSITIVE_MOD function
Date Tue, 28 Jul 2009 21:08:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen updated HIVE-656:
----------------------------

    Attachment: hive-656-2009-07-27.patch

Add positive_mod to udf. A new class UDFPosMod is added and registered to FunctionRegistry.
The new class is just a slightly modified version of UDFOPMod. 

> Add a POSITIVE_MOD function
> ---------------------------
>
>                 Key: HIVE-656
>                 URL: https://issues.apache.org/jira/browse/HIVE-656
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Zheng Shao
>         Attachments: hive-656-2009-07-27.patch
>
>
> There are a lot of cases people want to get a positive modulo result.
> For example, people want to bucket the data into 10 buckets. They use the hash code in
Hive (based on Java) which can return a negative number. Then they need this POSITIVE_MOD(a,
b) to return the results.
> Otherwise they can still do it but it will be very verbose:
> {code}
> ((hash(xxx) % 10) + 10) % 10
> {code}

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