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https://issues.apache.org/jira/browse/JENA-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988795#comment-15988795
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Andy Seaborne commented on JENA-1332:
-------------------------------------
This looks like the bug fix JENA-1275.
This can be investigated by switching the optimizer off with
{{ARQ.enableOptimizer(false);}}
With the optimizer off, the test fails on Jena 3.1.0, and pass with the
optimizer on.
> 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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