[jira] [Resolved] (JENA-1018) Variable Scoping Issues

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

     [ https://issues.apache.org/jira/browse/JENA-1018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne resolved JENA-1018.
---------------------------------
       Resolution: Fixed
    Fix Version/s: Jena 3.0.1

> Variable Scoping Issues
> -----------------------
>
>                 Key: JENA-1018
>                 URL: https://issues.apache.org/jira/browse/JENA-1018
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: Optimizer
>    Affects Versions: Jena 3.0.0
>            Reporter: Michael Schmidt
>            Assignee: Andy Seaborne
>             Fix For: Jena 3.0.1
>
>
> Consider the sample data
> {code}
> <http://example.com/Alice> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.com/Person> .
> <http://example.com/Flipper> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.com/Animal> .
> {code}
> and the following three queries:
> {code}
> SELECT ?s ?type WHERE { 
>   BIND("http://example.com/" AS ?typeBase)
>   {
>     BIND(URI(CONCAT(?typeBase,"Person")) AS ?type)
>    ?s ?p ?o
>    FILTER(?o=?type)
>   }
> }
> {code}
> {code}
> SELECT ?s ?type WHERE { 
>   BIND("http://example.com/" AS ?typeBase)
>   {
>     BIND(URI(CONCAT(?typeBase,"Person")) AS ?type)
>     ?s ?p ?o
>     FILTER(?o=?type)
>   }
>   UNION
>   {
>     BIND(URI(CONCAT(?typeBase,"Animal")) AS ?type)
>     ?s ?p ?o
>     FILTER(?o=?type)
>   }
> }
> {code}
> {code}
>  SELECT ?s ?type WHERE {
>    {
>      BIND(URI(CONCAT(?typeBase,"Person")) AS ?type)
>      ?s a ?o
>      FILTER(?o=?type)
>    }
>    UNION
>    {
>      BIND(URI(CONCAT(?typeBase,"Animal")) AS ?type)
>      ?s a ?o
>      FILTER(?o=?type)
>    }
>  } VALUES (?typeBase) { ("http://example.com/") }
> {code}
> As discussed in thread https://lists.w3.org/Archives/Public/public-sparql-dev/2015JulSep/0026.html, in all cases variable ?typeBase is not in scope when binding variable ?type. As a consequence, all queries should return the empty result. However, with apache-jena-3.0.0 (tested with sparql batch script) all of them yield non-empty results.



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