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Posted to dev@hive.apache.org by "David Phillips (JIRA)" <ji...@apache.org> on 2008/12/19 02:01:44 UTC
[jira] Updated: (HIVE-165) Add standard statistical functions
[ https://issues.apache.org/jira/browse/HIVE-165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Phillips updated HIVE-165:
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Summary: Add standard statistical functions (was: var(col) built-in to go with avg(col) and count(col))
> Add standard statistical functions
> ----------------------------------
>
> Key: HIVE-165
> URL: https://issues.apache.org/jira/browse/HIVE-165
> Project: Hadoop Hive
> Issue Type: Wish
> Components: Query Processor
> Reporter: Adam Kramer
> Assignee: David Phillips
> Priority: Minor
>
> The last step in the unholy triumvirate of statistical built-ins is the variance. We already have the n (count) and the mean (avg). I currently have a job or two that filters all of the data into a single reducer which just computes mean/n/variance and writes it to a table...so my guess is that this would be a pretty big speed increase. Not a huge deal though, as computing the variance myself is trivial.
> (Average, variance, and n can be co-computed in one pass, so if you're doing var() you can basically have avg() and count() for free.)
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