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From "Lianhui Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3430) group by followed by join with the same key should be optimized
Date Fri, 01 Mar 2013 08:17:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590321#comment-13590321
] 

Lianhui Wang commented on HIVE-3430:
------------------------------------

also should consider the following query:
SELECT a.key, a.cnt, b.key, a.cnt
FROM
(SELECT x.key as key, count(x.value) AS cnt FROM src x group by x.key) a
JOIN src b
ON (a.key = b.key);

                
> group by followed by join with the same key should be optimized
> ---------------------------------------------------------------
>
>                 Key: HIVE-3430
>                 URL: https://issues.apache.org/jira/browse/HIVE-3430
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.10.0
>            Reporter: Namit Jain
>


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