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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4331) Join returns results in wrong order
Date Wed, 05 Aug 2009 20:23:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739718#action_12739718
] 

Kathey Marsden commented on DERBY-4331:
---------------------------------------

Put this in two unrelated issues. Not sure if there is a problem with my browser or the driver.
 I think probably the latter.  Hopefully got it right this time.

As a matter of bookkeeping, if all of the wisconsin diffs are deemed acceptable and other
tests and reviews pass, I think we should do the partial backout as a resolution of this issue.
Then both DERBY-3926 and DERBY-4331 can be resolved and a new issue opened for any follow
up sort avoidance optimizations.


> Join returns results in wrong order
> -----------------------------------
>
>                 Key: DERBY-4331
>                 URL: https://issues.apache.org/jira/browse/DERBY-4331
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.2.0, 10.6.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Mike Matrigali
>         Attachments: createDBsimpler.txt, createDBsimplerVer2.txt, derby4331_do_not_commit.diff,
notorderby4331.zip, orderby4331.zip, repro.sql, repro2.sql, repro2_qryplan.txt, wisconsin.diff
>
>
> In Derby 10.5.2.0, the query below started returning results in wrong order (note the
ORDER BY clause). Derby 10.5.1.1 gives the expected ordering.
> ij> SELECT CS.ID
> FROM
>     CHANGESETS CS, FILECHANGES FC, REPOSITORIES R, FILES F, AUTHORS A
> WHERE
>     R.PATH = '/var/tmp/source5923202038296723704opengrok/mercurial' AND F.REPOSITORY
= R.ID AND A.REPOSITORY = R.ID AND
>     CS.REPOSITORY = R.ID AND CS.ID = FC.CHANGESET AND F.ID = FC.FILE AND
>     A.ID = CS.AUTHOR AND
>     EXISTS (
>         SELECT 1
>         FROM FILES F2
>         WHERE
>             F2.ID = FC.FILE AND F2.REPOSITORY = R.ID AND
>             F2.PATH LIKE '/%' ESCAPE '#')
> ORDER BY CS.ID DESC;
> ID         
> -----------
> 1          
> 2          
> 3          
> 2          
> 2          
> 3          
> 6 rows selected

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