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https://issues.apache.org/jira/browse/DERBY-4327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ramin Baradari updated DERBY-4327:
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Comment: was deleted
(was: Sehr geehrte Damen und Herren,
vielen Dank für Ihre Nachricht. Ich bin ab 1. Oktober 2012 wieder im Haus.
Meine E-Mails werden nicht weitergeleitet und erst dann beantwortet. In
dringenden Fällen wenden Sie sich bitte an Robert Buchwald unter der
E-Mail-Adresse [email protected].
Mit freundlichen Grüßen
Ramin Baradari
Dear Sir or Madam:
Thank you very much for your email. I will be out of the office until October
1, 2012. I will answer your email upon my return. Please note that your email
will not be forwarded during this time. In urgent cases, please do not hesitate
to contact Robert Buchwald, [email protected].
Best regards
Ramin Baradari
)
> Implement optimizer support for bushy trees.
> --------------------------------------------
>
> Key: DERBY-4327
> URL: https://issues.apache.org/jira/browse/DERBY-4327
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Rick Hillegas
> Labels: derby_triage10_10
>
> Currently, the optimizer only considers left-deep trees. For queries
> involving many tables, the best plan may be bushy. In this email thread, a
> user notes poor performance by Derby on queries involving 5 or more tables:
> http://www.nabble.com/Slow-performance-on-5-or-more-joins-in-a-star-schema-tt24708686.html
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