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https://issues.apache.org/jira/browse/HIVE-9?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661565#action_12661565
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Ashish Thusoo commented on HIVE-9:
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This should have already been addressed as part of predicate pushdown. Will
verify and close out.
> [hive] redundant columns being passed in group by stage 1
> ---------------------------------------------------------
>
> Key: HIVE-9
> URL: https://issues.apache.org/jira/browse/HIVE-9
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
>
> In the first map-reduce stage, all input columns are copied currently.
> Instead, we should walk over the filter and projections for that destination
> and only copy columns which occur there
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