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From "A B (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2526) Wrong query results due to column ordering in UNION view
Date Thu, 24 May 2007 22:04:28 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12498861
] 

A B commented on DERBY-2526:
----------------------------

> Now I'm thinking I should investigate the transitive closure code more carefully, to
see
> if there is a way to revise it so that it isn't so sensitive to the column re-ordering
...

Hi Bryan, I noticed that it's been a while since you posted anything to this issue.  Are you
still actively looking into this one?  Have you had any luck with your attempts to revise
the transitive closure code?

> 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: 10.0.2.1, 10.1.3.1, 10.2.2.0, 10.3.0.0
>            Reporter: Bryan Pendleton
>         Assigned To: Bryan Pendleton
>         Attachments: badQuery.log, 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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