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https://issues.apache.org/jira/browse/HIVE-757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain updated HIVE-757:
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Fix Version/s: (was: 0.5.0)
> Don't send constants from mapper to reducer for Group By queries
> ----------------------------------------------------------------
>
> Key: HIVE-757
> URL: https://issues.apache.org/jira/browse/HIVE-757
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Zheng Shao
> Assignee: Zheng Shao
>
> If an aggregation function takes a constant expression, we are still sending
> it from mapper to reducer, but it's not necessary since we can compute the
> constants on the reducer side.
> This will be useful for some UDAF that have configuration parameters:
> {code}
> SELECT pageid, logistic_regression("-t 1.0 -b 2.0", col1, col2, col3) FROM
> mytable GROUP BY pageid;
> {code}
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