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https://issues.apache.org/jira/browse/JENA-229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244032#comment-13244032
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Andy Seaborne commented on JENA-229:
------------------------------------
Is this JENA-211?
I tried to recreate this on the current development system but can't.
I don't get a duplicate with ARQ 2.9.1 / I do with ARQ 2.9.0.
What is the output of "arq.sparql --version" for the ARQ 2.9.1 you are using?
Simpler test case:
@prefix : <http://example/> .
:a :p :b .
:a :p :c .
Query:
SELECT DISTINCT * { ?a ?x [] }
I get different behavior between ARQ 2.9.0 (wrong) and current 2.9.1 (right).
(and ARQ 2.8.X's are wrong as well).
> "SELECT DISTINCT * " produces duplicates when blank nodes are used the graph
> pattern
> ------------------------------------------------------------------------------------
>
> Key: JENA-229
> URL: https://issues.apache.org/jira/browse/JENA-229
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: ARQ 2.9.0, ARQ 2.9.1
> Reporter: Stephen Allen
> Priority: Minor
>
> When using a blank node in the graph pattern of a query, using "select
> distinct *" can result in duplicate rows. There is a similar issue with
> "select reduced *"
> Steps to reproduce:
> 1) Load the "books" database [1]
> 2) Add an additional statement [2]
> 3) Run the following query:
> PREFIX books: <http://example.org/book/>
> PREFIX dc: <http://purl.org/dc/elements/1.1/>
> select distinct *
> where {
> ?book dc:title ?title .
> ?book dc:creator [] .
> }
> You see that you get a duplicate result for book5.
> If you change the query to:
> PREFIX books: <http://example.org/book/>
> PREFIX dc: <http://purl.org/dc/elements/1.1/>
> select distinct ?book ?title
> where {
> ?book dc:title ?title .
> ?book dc:creator [] .
> }
> You do not get duplicates.
> [1]
> http://svn.apache.org/repos/asf/incubator/jena/Jena2/Fuseki/trunk/Data/books.ttl
> [2] <http://example.org/book/book5> <http://purl.org/dc/elements/1.1/creator>
> "Sir Example" .
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