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https://issues.apache.org/jira/browse/JENA-587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13820002#comment-13820002
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Rob Vesse commented on JENA-587:
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The specific cause of the {{DISTINCT}} not being equivalent to the {{REDUCED}}
in your case is that the use of {{ORDER BY}} changes the ordering of rows so
the non-distinct rows are not adjacent meaning that {{REDUCED}} does not
eliminate them. Removing the {{ORDER BY}} does result in duplicates being
eliminated.
> SELECT DISTINCT returns duplicate results
> -----------------------------------------
>
> Key: JENA-587
> URL: https://issues.apache.org/jira/browse/JENA-587
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 2.11.0
> Reporter: Veyriere
> Attachments: bug Jena2.11.0.zip
>
>
> SELECT DISTINCT returns duplicate results. Attaching a small quads dump and
> the query to reproduce with TDB
> Reproduced with Jena 2.11.0 and Jena 2.10.1 (was working with 2.7.4)
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