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