[jira] [Created] (JENA-2332) Bad optimization transform when modifers used in SERVICE

["Andy Seaborne (Jira)" <ji...@apache.org>]

Andy Seaborne created JENA-2332:
-----------------------------------

             Summary: Bad optimization transform when modifers used in SERVICE
                 Key: JENA-2332
                 URL: https://issues.apache.org/jira/browse/JENA-2332
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 4.5.0
            Reporter: Andy Seaborne
            Assignee: Andy Seaborne


Report: https://lists.apache.org/thread/87wgds6c43j88829bscx4xkwsgcgq58p

{noformat}
SELECT * {
  SERVICE <https://dbpedia.org/sparql> { SELECT * { ?s a <http://dbpedia.org/ontology/MusicalArtist> } LIMIT 5 }
  SERVICE <https://dbpedia.org/sparql> { SELECT * { ?s <http://www.w3.org/2000/01/rdf-schema#label> ?x } LIMIT 1 }
}
{noformat}
produces
{noformat}
(sequence
  (service <https://dbpedia.org/sparql>
    (slice _ 5
      (bgp (triple ?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MusicalArtist>))))
  (service <https://dbpedia.org/sparql>
    (slice _ 1
      (bgp (triple ?s <http://www.w3.org/2000/01/rdf-schema#label> ?x)))))
{noformat}
but this query can't be transformed because of {{?s}}.

It needs to remain as a join.



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