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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4736) ASSERT FAIL when code generating a column reference in a join predicate in presence of other outer join reordering
Date Wed, 07 Jul 2010 22:38:51 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik updated DERBY-4736:
---------------------------------

    Attachment: loj-analysis.txt

The analysis in "loj-analysis.txt" which I upload, shows why the result gets different (and
wrong) with the reordering, by spelling out the intermediate results of the two orderings
variants.



> ASSERT FAIL when code generating a column reference in a join predicate in presence of
other outer join reordering
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4736
>                 URL: https://issues.apache.org/jira/browse/DERBY-4736
>             Project: Derby
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 10.7.0.0
>            Reporter: Dag H. Wanvik
>            Assignee: Dag H. Wanvik
>         Attachments: derby-4736-1a.diff, derby-4736-1a.stat, derby-4736-1b.diff, derby-4736-1b.stat,
loj-analysis.txt
>
>
> From schema given in DERBY-4712, this query gives an ASSERT with sane Derby:
> rs = s.executeQuery("SELECT 1 FROM (T0 LEFT JOIN (T1 LEFT JOIN (T2 LEFT JOIN " +
>                                " (T3 LEFT JOIN T4 ON 1=1) ON T2.X = T3.X) ON 1=1) ON
1=1) " +
>                                " LEFT JOIN " +
>                                " (T5 INNER JOIN T6 ON 1=1) " +
>                                " ON T2.X = 1 ");
> Cf the attachments in DERBY-4712 assert-bind-opt-trees.*. 
> From preliminary analysis, this error seems to be unrelated to the NPEs reported in DERBY-4712,
so filing this as a sub-issue.

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