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Date: Mon, 19 Jul 2010 12:03:50 -0400 (EDT)
From: "Rick Hillegas (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-4736) ASSERT FAIL when code generating a
 column reference in a join predicate in presence of other outer join
 reordering
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    [ https://issues.apache.org/jira/browse/DERBY-4736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889900#action_12889900 ] 

Rick Hillegas commented on DERBY-4736:
--------------------------------------

Thanks for the patch, Dag. It's a hopeful sign that this only involves a 1 line change to the engine code. If I understand this change correctly, it seems that you have replaced a full rebinding of all expressions with a more limited rebinding of just the result columns. I would think that a full rebinding would include the more limited rebinding of the result columns. Since you have just been through this pinball machine, can you explain why this fixes the problem? Thanks.

> 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, derby-4736-1c.diff, derby-4736-1c.stat, loj-analysis.txt, query_plan_derby_4736.pdf
>
>
> 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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