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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1534) predicate pushdown does not work correctly with outer joins
Date Fri, 13 Aug 2010 08:03:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898124#action_12898124
] 

Amareshwari Sriramadasu commented on HIVE-1534:
-----------------------------------------------

With ppd on or off, Mapper is filtering out table with alias a on the predicate a.key <
100 for the left outer join query. Similarly on alias b for right outer join query. This is
mostly because of HIVE-1538.

> 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
>            Assignee: 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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