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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-656) Add a POSITIVE_MOD function
Date Mon, 20 Jul 2009 20:54:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733347#action_12733347
] 

Zheng Shao commented on HIVE-656:
---------------------------------

MySQL mod function (which returns negative numbers when the first number is negative) http://dev.mysql.com/doc/refman/5.0/en/mathematical-functions.html#function_mod

> 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
>
> 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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