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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13982) Extensions to RS dedup: execute with different column order and sorting direction if possible
Date Wed, 22 Jun 2016 15:12:58 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez updated HIVE-13982:
-------------------------------------------
    Status: Patch Available  (was: In Progress)

> 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-13982.5.patch,
HIVE-13982.6.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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