Jeremy Coulon created JENA-1517:
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             Summary: 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


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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