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https://issues.apache.org/jira/browse/JENA-577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-577.
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> TDB detects attempt to reassign a variable.
> -------------------------------------------
>
> Key: JENA-577
> URL: https://issues.apache.org/jira/browse/JENA-577
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ, TDB
> Affects Versions: Jena 2.11.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Fix For: Jena 2.11.1
>
> Attachments: DevMain.java
>
>
> With TDB, but not with a general in-memory dataset, a query of the form:
> {noformat}
> PREFIX : <http://example/>
> SELECT *
> WHERE
> { ?x :p 123
> { SELECT ?x
> WHERE
> { ?x :p ?o }
> }
> }
> {noformat}
> (key feature: projection from the subsquery)
> causes
> {noformat}
> 20:24:32 ERROR QueryIteratorCloseable :: QueryFatalException
> com.hp.hpl.jena.sparql.ARQInternalErrorException: Attempt to reassign '?x'
> from '<http://example/x>' to '<http://example/x>'
> at
> com.hp.hpl.jena.sparql.engine.binding.BindingHashMap.checkAdd(BindingHashMap.java:111)
> at
> com.hp.hpl.jena.sparql.engine.binding.BindingHashMap.add(BindingHashMap.java:92)
> at
> com.hp.hpl.jena.sparql.engine.binding.BindingFactory.materialize(BindingFactory.java:60)
> at
> com.hp.hpl.jena.tdb.solver.QueryEngineTDB$QueryIteratorMaterializeBinding.moveToNextBinding(QueryEngineTDB.java:132)
> at
> com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.nextBinding(QueryIteratorBase.java:154)
> {noformat}
> Looking at the optimized algebra, TDB is correct.
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