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https://issues.apache.org/jira/browse/JENA-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989108#comment-15989108
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Andy Seaborne commented on JENA-1332:
-------------------------------------
That is the correct behaviour as fixed 3.1.0 -> 3.1.1.
{noformat}
WHERE
{ ?person person:firstname ?firstname ;
person:lastname ?lastname
{ FILTER NOT EXISTS { ?person person:hasCar ?carSubject } }
UNION
{ ?person person:hasCar ?carSubject }
}
{noformat}
The first BGP is evaluate, the UNION is evaluated (separately) and then they
are joined so
{noformat}
{ FILTER NOT EXISTS { ?person person:hasCar ?carSubject } }
{noformat}
sees no variables.
> Possibly incorrect results from SPARQL with union and filter not exists
> -----------------------------------------------------------------------
>
> Key: JENA-1332
> URL: https://issues.apache.org/jira/browse/JENA-1332
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.2.0
> Reporter: Stephen Owens
> Attachments: JenaFilterNotExistsUnionTest.java
>
>
> The test case attached to this issue shows an unexpected SPARQL result. We
> found the result while optimizing some SPARQL that had poor performance with
> some OPTIONAL clauses. We thought the optimization was the same as the
> original but in version 3.2.0 the result differs, it worked in 3.0.0.
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