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https://issues.apache.org/jira/browse/HIVE-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain updated HIVE-1:
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Issue Type: Improvement (was: Bug)
> [hive] redundant expression evaluation in group by stage 1
> ----------------------------------------------------------
>
> Key: HIVE-1
> URL: https://issues.apache.org/jira/browse/HIVE-1
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
>
> We can be smarter in terms of this list of what parameters we evaluate in the
> first stage, we should only evaluate those that are common across the group
> by clauses.
> All expressions and aggregation function parameters are evaluated in the
> first stage thereby increasing data flow. It might be better to only evaluate
> common expressions
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