Lorenz Bühmann created JENA-2107: ------------------------------------ Summary: RDF Star performance issue with non-concrete node triples Key: JENA-2107 URL: https://issues.apache.org/jira/browse/JENA-2107 Project: Apache Jena Issue Type: Improvement Components: ARQ Affects Versions: Jena 4.0.0, Jena 3.17.0 Reporter: Lorenz Bühmann Fix For: Jena 4.1.0
the following graph pattern is not evaluated efficiently (results in full-scan per binding) because the second triple pattern doesn't take advantage of the bindings generated by evaluation of the first one: {code:java} ?s <p> ?o . << ?s <p> ?o >> <p2> ?v . {code} A possible fix would be to adapt the method `rdfStarTripleSub` in class [SolverRX3.java|https://github.com/apache/jena/blob/2efff8a00b4ffa82751cf46c8a3fed84b6ff3090/jena-arq/src/main/java/org/apache/jena/sparql/engine/main/solver/SolverRX3.java#L63-L71] by changing the beginning to {code:java} private static Iterator<Binding> rdfStarTripleSub(Binding input, Triple xPattern, ExecutionContext execCxt) { Triple tPattern = Substitute.substitute(xPattern, input); {code} We went from 75s for a very small dataset (50k triples) to near instant response times. -- This message was sent by Atlassian Jira (v8.3.4#803005)