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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1534) Join filters do not work correctly with outer joins
Date Tue, 21 Sep 2010 05:51:33 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912845#action_12912845
] 

Namit Jain commented on HIVE-1534:
----------------------------------

What I meant to say was the following:


People are running queries in the warehouse with the expected wrong semantics - if we suddenly
fix this, the queries will break.
We need to give some time to everyone to change their queries to use a sub-query if they want
the filter to be pushed up.

Adding the above config, parameter seems like the only choice - we can try to remove this
parameter before 0.7 goes out 
(if everyone agrees), but we need it right now for deployment

> Join filters do not work correctly with outer joins
> ---------------------------------------------------
>
>                 Key: HIVE-1534
>                 URL: https://issues.apache.org/jira/browse/HIVE-1534
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>         Attachments: patch-1534-1.txt, patch-1534-2.txt, patch-1534-3.txt, patch-1534.txt
>
>
>  SELECT * FROM T1 LEFT OUTER JOIN T2 ON (T1.c1=T2.c2 AND T1.c1 < 10)
> and  SELECT * FROM T1 RIGHT OUTER JOIN T2 ON (T1.c1=T2.c2 AND T2.c1 < 10)
> do not give correct results.

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