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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-3070) Filter on outer join condition removed while merging join tree
Date Thu, 19 Jul 2012 08:05:36 GMT

     [ https://issues.apache.org/jira/browse/HIVE-3070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Navis updated HIVE-3070:
------------------------

    Status: Patch Available  (was: Open)

https://reviews.facebook.net/D4239
                
> Filter on outer join condition removed while merging join tree
> --------------------------------------------------------------
>
>                 Key: HIVE-3070
>                 URL: https://issues.apache.org/jira/browse/HIVE-3070
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 0.9.0, 0.8.1, 0.10.0
>            Reporter: Zhang Xinyu
>            Assignee: Navis
>
> should the result of query A: 
> select s.aa, s.bb, c.key keyc from (select a.key aa, b.key bb from src a left outer join
src b on a.key=b.key) s left outer join src c on s.bb=c.key and s.bb<10 where s.aa<20;
> be the same as query B:
> select a.key keya, b.key keyb, c.key keyc from src a left outer join src b on a.key=b.key
left outer join src c on b.key=c.key and b.key<10 where a.key<20;
> ?
> Currently, the result is different, query B gets wrong result!
> In SemanticAnalyzer.java, mergeJoins():
> ArrayList<ArrayList<ASTNode>> filters = target.getFilters();
> for (int i = 0; i < nodeRightAliases.length; i++) {
>   filters.add(node.getFilters().get(i + 1));
> }
> filters in node.getFilters().get(0) are lost.

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