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https://issues.apache.org/jira/browse/JENA-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430505#comment-16430505
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ASF GitHub Bot commented on JENA-1517:
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Github user rvesse commented on the issue:
https://github.com/apache/jena/pull/393
+1
> 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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