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From "Chun Chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-5358) ReduceSinkDeDuplication should ignore column orders when check overlapping part of keys between parent and child
Date Thu, 26 Sep 2013 06:40:07 GMT

     [ https://issues.apache.org/jira/browse/HIVE-5358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chun Chen updated HIVE-5358:
----------------------------

    Status: Patch Available  (was: Open)
    
> ReduceSinkDeDuplication should ignore column orders when check overlapping part of keys
between parent and child
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-5358
>                 URL: https://issues.apache.org/jira/browse/HIVE-5358
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Chun Chen
>            Assignee: Chun Chen
>         Attachments: D13113.1.patch, HIVE-5358.2.patch, HIVE-5358.patch
>
>
> {code}
> select key, value from (select key, value from src group by key, value) t group by key,
value;
> {code}
> This can be optimized by ReduceSinkDeDuplication
> {code}
> select key, value from (select key, value from src group by key, value) t group by value,
key;
> {code}
> However the sql above can't be optimized by ReduceSinkDeDuplication currently due to
different column orders of parent and child operator.

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