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https://issues.apache.org/jira/browse/JENA-2132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17380130#comment-17380130
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Claus Stadler commented on JENA-2132:
-------------------------------------
I created a [PR|https://github.com/apache/jena/pull/1028].
> Rename.java lacks RDFStar support
> ---------------------------------
>
> Key: JENA-2132
> URL: https://issues.apache.org/jira/browse/JENA-2132
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 4.1.0
> Reporter: Claus Stadler
> Priority: Major
>
> This is a follow up to JIRA-2107 (RDF Star performance issue with
> non-concrete node triples)
> The NodeTransformers in Rename.java lacks renaming of variables in RDFStar
> NodeTriples.
> A common side effect of this incomplete renaming is that the substitution
> provided for JIRA-2107 cannot be applied resulting in extremely bad query
> performance.
> {code:java}
> Query query = QueryFactory.create
> ( "SELECT COUNT(*) {\n"
> + " SELECT ?src {\n"
> + " ?src <urn:connectedTo> ?tgt .\n"
> + " << ?src <urn:connectedTo> ?tgt >>\n"
> + " <urn:hasValue> ?v\n"
> + " }\n"
> + "}"
> );
> Op op = Algebra.compile(query);
> Op op2 = TransformScopeRename.transform(op);
> System.out.println(op2);
> {code}
> Actual:
> {noformat}
> (project (?.1) (extend ((?.1 ?.0)) (group () ((?.0 (count))) (project (?src)
> (bgp
> (triple ?src <urn:connectedTo> ?/tgt)
> (triple << ?src <urn:connectedTo> ?tgt >> <urn:hasValue> ?/v)
> ^^^^
> )))))
> {noformat}
> Expected:
> {noformat}
> (project (?.1) (extend ((?.1 ?.0)) (group () ((?.0 (count))) (project (?src)
> (bgp
> (triple ?src <urn:connectedTo> ?/tgt)
> (triple << ?src <urn:connectedTo> ?/tgt >> <urn:hasValue> ?/v)
> ^^^^^
> )))))
> {noformat}
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