Simon Fell created JENA-1778:
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Summary: 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
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
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