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From "Myrna van Lunteren (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-4595) Inferior query plan chosen for outer join
Date Tue, 06 Sep 2011 17:43:13 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Myrna van Lunteren updated DERBY-4595:
--------------------------------------

    Priority: Critical  (was: Blocker)

Lowering priority from blocker to critical; it certainly warrants investigation but not enough
to block a release.

> Inferior query plan chosen for outer join
> -----------------------------------------
>
>                 Key: DERBY-4595
>                 URL: https://issues.apache.org/jira/browse/DERBY-4595
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.5.3.0
>         Environment: Ubuntu 9.10, Sun Java 6 update 18
>            Reporter: Witold Szczerba
>            Priority: Critical
>              Labels: plan, query
>         Attachments: netbroker-ddl.txt, queryplan-1.txt, queryplan-1b.txt, queryplan-2.txt,
queryplan-2b.txt
>
>
> I was describing everything here and when trying to submit - everything was lost, because
the session ended and there was no way of going back, so I will just point to derby-user mailing
list, everything is there, just follow the thread:
> http://mail-archives.apache.org/mod_mbox/db-derby-user/201003.mbox/%3Ce0a08d801003190619l3d3181pa55ca79145b7810d@mail.gmail.com%3E
> or there:
> http://thread.gmane.org/gmane.comp.apache.db.derby.user/12394
> The bottom line is - I had to change application to avoid the query, it is so slow (around
one hour on production) and there is no workaround.

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