[jira] [Created] (JENA-1021) Odd MINUS behavior in a UNION

[William Tritchler (JIRA)]

William Tritchler created JENA-1021:
---------------------------------------

             Summary: Odd MINUS behavior in a UNION
                 Key: JENA-1021
                 URL: https://issues.apache.org/jira/browse/JENA-1021
             Project: Apache Jena
          Issue Type: Bug
          Components: Jena
    Affects Versions: Jena 3.0.0
            Reporter: William Tritchler


Given the sample data:
{code}
@prefix owl:    <http://www.w3.org/2002/07/owl#>
@prefix rdfs:   <http://www.w3.org/2000/01/rdf-schema#> .
@prefix :       <http://no.such.org/test#> .

<urn:test:node1>
    a :TestNode ;
    rdfs:label "Node 1" .

<urn:test:node2>
    a :TestNode ;
    rdfs:label "Node 2" .

:TestNode
  a owl:Class ;
  rdfs:label "Test Node" .
{code}

When I run the union query:
{code}
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX app: <http://no.such.org/test#>
 
select distinct ?id where {
  ?id a app:TestNode .
  {
    ?id rdfs:label "Node 1" .
    minus { ?id a app:TestNode }
  } union {
    ?id rdfs:label "Node 1" .
    minus { ?id a app:TestNode }
  }
}
{code}

*Observed:*
The query unexpectedly returns a single value: <urn:test:node1>

*Expected:*
The query should return no results.

Unless, of course, I'm totally off-base here.  I suspect an issue, since 
removing the union and having a single:
{code}
  {
    ?id rdfs:label "Node 1" .
    minus { ?id a app:TestNode }
  }
{code} returns the expected empty result set.



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