You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@jena.apache.org by "Claus Stadler (Jira)" <ji...@apache.org> on 2021/07/13 19:37:00 UTC
[jira] [Commented] (JENA-2132) Rename.java lacks RDFStar support
[ https://issues.apache.org/jira/browse/JENA-2132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17380130#comment-17380130 ]
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}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)