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From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1534) predicate pushdown does not work correctly with outer joins
Date Thu, 12 Aug 2010 19:29:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897909#action_12897909
] 

John Sichi commented on HIVE-1534:
----------------------------------

Definitely a bug.  It happens regardless of the setting of hive.optimize.ppd, so it probably
has something to do with the way the join condition is decomposed rather than the predicate
pushdown optimization.

> predicate pushdown does 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
>
> The hive documentation for predicate pushdown says:
> Left outer join: predicates on the left side aliases are pushed
> Right outer join: predicates on the right side aliases are pushed
> But, this pushdown should not happen for AND predicates in join queries:
> ex: SELECT * FROM T1 JOIN T2 ON (T1.c1=T2.c2 AND T1.c1 < 10)

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