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https://issues.apache.org/jira/browse/JENA-1167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458037#comment-16458037
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ASF subversion and git services commented on JENA-1167:
-------------------------------------------------------
Commit 1bd5fdcf3ac0694e0bbabd2f8e63deb92d3c2bff in jena's branch
refs/heads/master from [~andy.seaborne]
[ https://git-wip-us.apache.org/repos/asf?p=jena.git;h=1bd5fdc ]
JENA-1534: Test for filter-only variables in EXISTS.
Tighten the classifer, assumes proper use of (sequence)
Relates to JENA-1167, JENA-1280.
> Variables used in a filter and then defined are not handled properly by the
> join strategy.
> ------------------------------------------------------------------------------------------
>
> Key: JENA-1167
> URL: https://issues.apache.org/jira/browse/JENA-1167
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.0.1
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 3.1.1
>
> Attachments: D.ttl, Q.rq, dwim
>
>
> {noformat}
> Query: Q.rq
> 1 PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> 2 PREFIX ex: <http://example.com/>
> 3 SELECT ?label {
> 4 {
> 5 FILTER (bound(?arg1))
> 6 }
> 7 ?arg1 rdfs:label ?label
> 8 }
> 9 VALUES ?arg1 { ex:a UNDEF }
> Data: D.ttl
> 1 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
> 2 @prefix ex: <http://example.com/>.
> 3
> 4 ex:a rdfs:label "A".
> 5 ex:b rdfs:label "B".
> Execute: qparse --print=op --print=opt --query Q.rq
> (prefix ((rdfs: <http://www.w3.org/2000/01/rdf-schema#>)
> (ex: <http://example.com/>))
> (project (?label)
> (join
> (join
> (filter (bound ?arg1)
> (table unit))
> (bgp (triple ?arg1 rdfs:label ?label)))
> (table (vars ?arg1)
> (row [?arg1 ex:a])
> (row)
> ))))
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> (prefix ((rdfs: <http://www.w3.org/2000/01/rdf-schema#>)
> (ex: <http://example.com/>))
> (project (?label)
> (sequence
> (table (vars ?arg1)
> (row [?arg1 ex:a])
> (row)
> )
> (sequence
> (filter (bound ?arg1)
> (table unit))
> (bgp (triple ?arg1 rdfs:label ?label))))))
> Execute: sparql --engine=ref --query Q.rq --data D.ttl
> ---------
> | label |
> =========
> ---------
> Execute: sparql --query Q.rq --data D.ttl
> ---------
> | label |
> =========
> | "A" |
> ---------
> {noformat}
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