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Posted to dev@jena.apache.org by "Andy Seaborne (JIRA)" <ji...@apache.org> on 2011/02/28 21:36:37 UTC
[jira] Assigned: (JENA-52) GROUP_CONCAT DISTINCT on unbound
variable causes NPE
[ https://issues.apache.org/jira/browse/JENA-52?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andy Seaborne reassigned JENA-52:
---------------------------------
Assignee: Andy Seaborne
> GROUP_CONCAT DISTINCT on unbound variable causes NPE
> ----------------------------------------------------
>
> Key: JENA-52
> URL: https://issues.apache.org/jira/browse/JENA-52
> Project: Jena
> Issue Type: Bug
> Components: ARQ
> Environment: Java
> Reporter: Damian Steer
> Assignee: Andy Seaborne
> Labels: arq, group_concat, npe
>
> Data:
> {code}
> @prefix ex: <http://example.com/ns#> .
> ex:a ex:p1 "1" .
> ex:b ex:p1 "2" ; ex:p2 "3" .
> {code}
> Query:
> {code}
> prefix ex: <http://example.com/ns#>
> select ?s (group_concat(distinct ?p2) as ?concat)
> { ?s ex:p1 ?p1 optional { ?s ex:p2 ?p2 } }
> group by ?s
> {code}
> Result:
> {noformat}
> java.lang.NullPointerException
> at com.hp.hpl.jena.sparql.expr.aggregate.AggGroupConcatDistinct$AccGroupConcatDistinct.getValue(AggGroupConcatDistinct.java:124)
> at com.hp.hpl.jena.sparql.expr.aggregate.AggregatorBase.getValue(AggregatorBase.java:62)
> at com.hp.hpl.jena.sparql.engine.iterator.QueryIterGroup$1.initializeIterator(QueryIterGroup.java:147)
> at org.openjena.atlas.iterator.IteratorDelayedInitialization.init(IteratorDelayedInitialization.java:25)
> {noformat}
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