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https://issues.apache.org/jira/browse/HIVE-4877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713967#comment-13713967
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Yin Huai commented on HIVE-4877:
--------------------------------
Review board has been updated. I am also attaching the patch at here.
> In ExecReducer, remove tag from the row which will be passed to the first
> Operator at the Reduce-side
> -----------------------------------------------------------------------------------------------------
>
> Key: HIVE-4877
> URL: https://issues.apache.org/jira/browse/HIVE-4877
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.12.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Attachments: HIVE-4877.patch
>
>
> In ExecReducer, we can see ...
> {code}
> row.clear();
> row.add(keyObject);
> row.add(valueObject[tag.get()]);
> // The tag is not used any more, we should remove it.
> row.add(tag);
> {\code}
> I have seen this for a long time. Actually, we are using
> {code}
> reducer.process(row, tag.get());
> {\code}
> to pass the tag.
> If we do not need to add the tag to a row, we should remove it.
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