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https://issues.apache.org/jira/browse/JENA-294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433427#comment-13433427
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Simon Helsen commented on JENA-294:
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this is related to JENA 283
                
> 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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