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From "A B (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DERBY-2526) Wrong query results due to column ordering in UNION view
Date Wed, 30 May 2007 16:43:16 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

A B resolved DERBY-2526.

       Resolution: Fixed
    Fix Version/s:
       Derby Info: [Existing Application Impact]  (was: [Existing Application Impact, Patch

Thanks, as always, for your willingness to review, Bryan.  I committed the _v2 patch with
svn # 542867:

  URL: http://svn.apache.org/viewvc?view=rev&rev=542867

Marking issue as resolved for 10.3, though I think it still needs a release note...

> Wrong query results due to column ordering in UNION view
> --------------------------------------------------------
>                 Key: DERBY-2526
>                 URL: https://issues.apache.org/jira/browse/DERBY-2526
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:,,,
>            Reporter: Bryan Pendleton
>            Assignee: A B
>             Fix For:
>         Attachments: badQuery.log, d2526_v1.html, d2526_v1.patch, d2526_v2.patch, d2526_v2.stat,
derby-2526.sql, DistinctTestNotes.txt, firstTryPatch.diff, goodQuery.log
> I think both select statements in the attached repro script should return 1 row, but
in fact the first statement returns 1 row and the second returns zero rows.
> The only difference between the two statements is that the columns in the UNION view
are listed in a different order (bvw vs. bvw2).
> This seems like a bug to me; the order of the columns in the view definition shouldn't
matter, should it? 
> As Army noted on the derby-dev list, the fact that this reproduces with 10.0 means that
it is not caused by some of the 10.2 optimizer changes. Something else is going wrong.

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