[jira] [Resolved] (JENA-1778) COUNT(DISTINCT *) can generate incorrect results.

["Andy Seaborne (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne resolved JENA-1778.
---------------------------------
    Fix Version/s: Jena 3.14.0
       Resolution: Fixed

> 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
>             Fix For: Jena 3.14.0
>
>          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
>  



--
This message was sent by Atlassian Jira
(v8.3.4#803005)