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https://issues.apache.org/jira/browse/HADOOP-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain reassigned HADOOP-4157:
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Assignee: Namit Jain
> [hive] redundant expression evaluation in group by stage 1
> ----------------------------------------------------------
>
> Key: HADOOP-4157
> URL: https://issues.apache.org/jira/browse/HADOOP-4157
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/hive
> Reporter: Namit Jain
> Assignee: 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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