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https://issues.apache.org/jira/browse/JENA-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16975069#comment-16975069
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ASF subversion and git services commented on JENA-1778:
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Commit bed564bf777b74d272424bcd6595a504d830db37 in jena's branch
refs/heads/master from Andy Seaborne
[ https://gitbox.apache.org/repos/asf?p=jena.git;h=bed564b ]
Merge pull request #630 from afs/jena1778-distinct
JENA-1778: Hide system vars in COUNT(DISTINCT *)
> 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
> Assignee: Andy Seaborne
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 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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