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Posted to jira@jena.apache.org by "Andy Seaborne (Jira)" <ji...@apache.org> on 2022/06/03 20:24:00 UTC
[jira] [Commented] (JENA-2332) Bad optimization transform when modifers used in SERVICE
[ https://issues.apache.org/jira/browse/JENA-2332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546968#comment-17546968 ]
Andy Seaborne commented on JENA-2332:
-------------------------------------
Similar to JENA-1813 where GRAPH was hiding the pattern.
> 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
> Priority: Major
>
> 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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