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https://issues.apache.org/jira/browse/JENA-1018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andy Seaborne reassigned JENA-1018:
-----------------------------------
Assignee: Andy Seaborne
> 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
>
> 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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