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https://issues.apache.org/jira/browse/DERBY-4736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dag H. Wanvik updated DERBY-4736:
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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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