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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1534) Join filters does not work correctly with outer joins
Date Tue, 07 Sep 2010 05:04:32 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated HIVE-1534:
------------------------------------------

        Summary: Join filters does not work correctly with outer joins  (was: predicate pushdown
does not work correctly with outer joins)
    Description: 
 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)
does not give correct results.

  was:
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)



> Join filters 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
>
>  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)
> does not give correct results.

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