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https://issues.apache.org/jira/browse/HIVE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576337#comment-13576337
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Gunther Hagleitner commented on HIVE-2340:
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[~navis]: Are you suggesting to just revert the changes in
ColumnPrunerProcFactory? I've tried that, but when I do that
reduce_deduplicate_extended.q is failing. I've started to debug into that
problem - it seems backtracking fails at that point because it can't find the
source of "KEY._col0" etc. Seems there should be entries for that in the
colExprMap of the RS, but that's not there. Are you getting different results?
> optimize orderby followed by a groupby
> --------------------------------------
>
> Key: HIVE-2340
> URL: https://issues.apache.org/jira/browse/HIVE-2340
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor
> Reporter: Navis
> Assignee: Navis
> Priority: Minor
> Labels: perfomance
> Attachments: ASF.LICENSE.NOT.GRANTED--HIVE-2340.D1209.1.patch,
> ASF.LICENSE.NOT.GRANTED--HIVE-2340.D1209.2.patch,
> ASF.LICENSE.NOT.GRANTED--HIVE-2340.D1209.3.patch,
> ASF.LICENSE.NOT.GRANTED--HIVE-2340.D1209.4.patch,
> ASF.LICENSE.NOT.GRANTED--HIVE-2340.D1209.5.patch, HIVE-2340.1.patch.txt,
> HIVE-2340.D1209.10.patch, HIVE-2340.D1209.11.patch, HIVE-2340.D1209.6.patch,
> HIVE-2340.D1209.7.patch, HIVE-2340.D1209.8.patch, HIVE-2340.D1209.9.patch,
> testclidriver.txt
>
>
> Before implementing optimizer for JOIN-GBY, try to implement RS-GBY
> optimizer(cluster-by following group-by).
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