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https://issues.apache.org/jira/browse/HIVE-13982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340825#comment-15340825
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Jesus Camacho Rodriguez commented on HIVE-13982:
------------------------------------------------
New patch uploaded; I want to get a QA run. I still need to check whether PTF
would cause troubles with the new dedup extension. I will update the JIRA case
shortly.
> Extensions to RS dedup: execute with different column order and sorting
> direction if possible
> ---------------------------------------------------------------------------------------------
>
> Key: HIVE-13982
> URL: https://issues.apache.org/jira/browse/HIVE-13982
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Affects Versions: 2.2.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-13982.2.patch, HIVE-13982.3.patch,
> HIVE-13982.4.patch, HIVE-13982.patch
>
>
> Pointed out by [~gopalv].
> RS dedup should kick in for these cases, avoiding an additional shuffle stage.
> {code}
> select state, city, sum(sales) from table
> group by state, city
> order by state, city
> limit 10;
> {code}
> {code}
> select state, city, sum(sales) from table
> group by city, state
> order by state, city
> limit 10;
> {code}
> {code}
> select state, city, sum(sales) from table
> group by city, state
> order by state desc, city
> limit 10;
> {code}
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