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https://issues.apache.org/jira/browse/JENA-79?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne resolved JENA-79.
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Resolution: Fixed
Thanks for the complete bug report.
Fixed in the latest development build:
http://www.openjena.org/repo-dev/com/hp/hpl/jena/arq/
> Wrong query result when FILTERing an unbound variable
> -----------------------------------------------------
>
> Key: JENA-79
> URL: https://issues.apache.org/jira/browse/JENA-79
> Project: Jena
> Issue Type: Bug
> Components: ARQ
> Environment: ARQ-2.8.8 / Sun Java SE 6
> Reporter: Giovanni Mels
> Labels: filter, optional, unbound
>
> Consider the graph:
> {code}
> @prefix ex: <http://example.com/ns#>.
> ex:subject a ex:Class.
> {code}
> and the query
> {code}
> PREFIX ex: <http://example.com/ns#>
> SELECT ?x WHERE {
> ?s a ?c
> OPTIONAL { ?s ex:property ?x }
> FILTER (?x = ex:v)
> }
> {code}
> Executing the query on the graph should return no solutions (?x is unbound,
> so the filter evaluates to 'error'). But I get the result:
> {code}
> -----------------------------
> | x |
> =============================
> | <http://example.com/ns#v> |
> -----------------------------
> {code}
> When changing the query to filter on a literal (?x = "string") or (?x = 1),
> the query returns no results.
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