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https://issues.apache.org/jira/browse/DERBY-4331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739698#action_12739698
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Mamta A. Satoor commented on DERBY-4331:
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Mike and I have been talking about different possibilities for
DERBY-4331/DERBY-3926 given the time critical nature of it. We decided that we
will investigate the fix for DERBY-3926 to see what can be backed out and at
the same time debug the reason beind DERBY-4331 failure. I will write the
information I have collected over last couple days on the reason behind the bug
DERBY-4331 and apossible fix for it but first would like to comment on Mike's
proposal about backing out some of DERBY-3926 changes
I agree with the partial backout of DERBY-3926. The code proposed for backout
was written to cover additional queries so that we can avoid sorting for them
if possible but from what I recall, it was not needed for fixing DERBY-3926. So
it should be safe to backout part of the change w/o impacting any queries
negatively. It will be good to do full tests before we commit those changes
though.
> 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
>
>
> 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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