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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1372) New algorithm for variance() UDAF
Date Fri, 28 May 2010 13:50:38 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashish Thusoo updated HIVE-1372:
--------------------------------

    Status: Patch Available  (was: Open)

Hi Mayank,

Thanks for the contribution. Please do a submit patch when you put up a patch for a JIRA.

Thanks,
Ashish

> New algorithm for variance() UDAF
> ---------------------------------
>
>                 Key: HIVE-1372
>                 URL: https://issues.apache.org/jira/browse/HIVE-1372
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.6.0
>            Reporter: Mayank Lahiri
>            Priority: Minor
>             Fix For: 0.6.0
>
>         Attachments: HIVE-1372.patch
>
>
> A new algorithm for the UDAF that computes variance. This is pretty much a drop-in replacement
for the current UDAF, and has two benefits: provably numerically stable (reference included
in comments), and reduces arithmetic operations by about half.

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