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https://issues.apache.org/jira/browse/JENA-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430531#comment-16430531
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ASF GitHub Bot commented on JENA-1517:
--------------------------------------

Github user jeremy-coulon commented on the issue:

    https://github.com/apache/jena/pull/393
  
    It seems that I fixed the MINUS queries but FILTER EXISTS/NOT EXISTS are 
still not working.


> Some queries not working when using OpQuadBlock
> -----------------------------------------------
>
>                 Key: JENA-1517
>                 URL: https://issues.apache.org/jira/browse/JENA-1517
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: ARQ
>    Affects Versions: Jena 3.6.0
>            Reporter: Jeremy Coulon
>            Priority: Major
>
> I am using a custom QueryEngine that rewrites algebra. I am transforming 
> OpBGP into OpQuadBlock (not OpQuadPattern).
> Most queries work fine except when using one of the following:
>  * MINUS
>  * FILTER EXISTS
>  * FILTER NOT EXISTS
> I tracked the issue down to this visitor: 
> org.apache.jena.sparql.algebra.OpVarsPattern.
> An override for visit(OpQuadBlock) is missing.



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