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https://issues.apache.org/jira/browse/HIVE-13982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15349987#comment-15349987
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Lefty Leverenz commented on HIVE-13982:
---------------------------------------
Doc note: This adds *hive.order.columnalignment* to HiveConf.java, so it will
need to be documented in the wiki for 2.2.0 and 2.1.1.
* [Configuration Properties -- Query and DDL Execution |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]
Added TODOC2.2 and TODOC2.1.1 labels.
> 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
> Labels: TODOC2.1.1, TODOC2.2
> Fix For: 2.2.0, 2.1.1
>
> Attachments: HIVE-13982.2.patch, HIVE-13982.3.patch,
> HIVE-13982.4.patch, HIVE-13982.5.patch, HIVE-13982.6.patch,
> HIVE-13982.7.patch, HIVE-13982.8.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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