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Posted to dev@jena.apache.org by "Simon Helsen (JIRA)" <ji...@apache.org> on 2012/08/13 21:02:37 UTC

[jira] [Updated] (JENA-294) TransformFilterEquality does not handle starting OPTIONAL well

     [ https://issues.apache.org/jira/browse/JENA-294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Helsen updated JENA-294:
------------------------------

    Attachment: patch.txt
    
> TransformFilterEquality does not handle starting OPTIONAL well
> --------------------------------------------------------------
>
>                 Key: JENA-294
>                 URL: https://issues.apache.org/jira/browse/JENA-294
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: ARQ
>    Affects Versions: Jena 2.7.4
>            Reporter: Simon Helsen
>         Attachments: patch.txt
>
>
> There was one other case where our tests were stuck on a very slow query execution because transformFilterEquality failed to optimize. The problem is that the optimizer gives up whenever the WHERE clause starts with an OPTIONAL clause. The reason is that the generated algebraic formula starts with a TableUnit and this is not handled correctly. 
> I have attached a patch which fixes the problem

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