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https://issues.apache.org/jira/browse/HIVE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571177#comment-13571177
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Phabricator commented on HIVE-2340:
-----------------------------------
njain has commented on the revision "HIVE-2340 [jira] optimize orderby followed
by a groupby".
Do you think it might be a good idea to get HIVE-3972 first ?
INLINE COMMENTS
ql/src/java/org/apache/hadoop/hive/ql/optimizer/ReduceSinkDeDuplication.java:99
Isn't it true that R1 and R2 will have the same cost for
RS -> GBY --> anything --> RS ?
If yes, how do you know which rule will be fired ?
REVISION DETAIL
https://reviews.facebook.net/D1209
To: JIRA, navis
Cc: hagleitn, njain
> 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.D1209.6.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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