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https://issues.apache.org/jira/browse/JENA-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Fell updated JENA-1778:
-----------------------------
Description:
Using COUNT(DISTINCT *) appears to generate the wrong result, in that it
appears to include system generated bindings as part of the solution when
DISTINCTing them. (I think similar to the issue in JENA-211).
For example, I'd expect these 2 queries to return the same results, as ?lbl
should be the only variable considered part of the solutions.
{code:java}
SELECT (COUNT(DISTINCT *) as ?c)
WHERE { <child3> <p>+/<label> ?lbl }
{code}
{code:java}
SELECT (COUNT(DISTINCT ?lbl) as ?c)
WHERE { <child3> <p>+/<label> ?lbl }
{code}
However these return different results. A full simple repro case is available
at https://github.com/superfell/jena-count-distinct-star
was:
Using COUNT(DISTINCT *) appears to generate the wrong result, in that it
appears to include system generated bindings as part of the solution when
DISTINCTing them. (I think similar to the issue in JENA-211).
For example, I'd expect these 2 queries to return the same results, as ?lbl
should be the only variable considered part of the solutions.
{code:java}
SELECT (COUNT(DISTINCT *) as ?c)
WHERE { <child3> <p>+/<label> ?lbl }{code}
{{}}
{{}}
{code:java}
{code}
{{SELECT (COUNT(DISTINCT ?lbl) as ?c)}}
{{WHERE \{ <child3> <p>+/<label> ?lbl }}}
However these return different results. A full simple repro case is available
at https://github.com/superfell/jena-count-distinct-star
> COUNT(DISTINCT *) can generate incorrect results.
> -------------------------------------------------
>
> Key: JENA-1778
> URL: https://issues.apache.org/jira/browse/JENA-1778
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.13.1
> Reporter: Simon Fell
> Priority: Minor
>
> Using COUNT(DISTINCT *) appears to generate the wrong result, in that it
> appears to include system generated bindings as part of the solution when
> DISTINCTing them. (I think similar to the issue in JENA-211).
> For example, I'd expect these 2 queries to return the same results, as ?lbl
> should be the only variable considered part of the solutions.
> {code:java}
> SELECT (COUNT(DISTINCT *) as ?c)
> WHERE { <child3> <p>+/<label> ?lbl }
> {code}
> {code:java}
> SELECT (COUNT(DISTINCT ?lbl) as ?c)
> WHERE { <child3> <p>+/<label> ?lbl }
> {code}
>
> However these return different results. A full simple repro case is available
> at https://github.com/superfell/jena-count-distinct-star
>
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