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

["Andy Seaborne (JIRA)" <ji...@apache.org>]

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

Andy Seaborne resolved JENA-294.
--------------------------------

       Resolution: Fixed
    Fix Version/s: Jena 2.10.0

Original cause addressed.  Other issues need a clear description of an issue to address.
                
> TransformFilterEquality does not handle starting OPTIONAL well
> --------------------------------------------------------------
>
>                 Key: JENA-294
>                 URL: https://issues.apache.org/jira/browse/JENA-294
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ, Optimizer
>    Affects Versions: Jena 2.7.4
>            Reporter: Simon Helsen
>             Fix For: Jena 2.10.0
>
>         Attachments: filter-equality-13.rq, filter-equality-13.srj, jena-294-afs-1.patch, manifestPatchForOptFilterEquality.txt, patch.txt, patch.txt, test-filter-equality.zip
>
>
> 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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