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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4331) Join returns results in wrong order
Date Sun, 02 Aug 2009 14:59:14 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738084#action_12738084
] 

Knut Anders Hatlen commented on DERBY-4331:
-------------------------------------------

Calling SYSCS_UTIL.SYSCS_UPDATE_STATISTICS on the tables involved also makes the result come
out in the right order, so it seems like the bug only appears when a certain plan is chosen.

The problem does not occur when I revert to revision 783167, but it does occur with revision
783168, which suggests that it was triggered by DERBY-3926.

> 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
>            Reporter: Knut Anders Hatlen
>         Attachments: repro.sql
>
>
> 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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