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Posted to jira@jena.apache.org by "Georgy Litvinov (Jira)" <ji...@apache.org> on 2022/06/17 13:20:00 UTC
[jira] [Created] (JENA-2333) Sorting by labels in SPARQL query fail
Georgy Litvinov created JENA-2333:
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Summary: Sorting by labels in SPARQL query fail
Key: JENA-2333
URL: https://issues.apache.org/jira/browse/JENA-2333
Project: Apache Jena
Issue Type: Bug
Components: ARQ, Jena
Affects Versions: Jena 4.5.0, Jena 3.16.0, Jena 2.10.1
Reporter: Georgy Litvinov
Attachments: SortingBug.java, bad_data_out.n3
{color:#4e9a06}Sorting by labels fail on this data set.{color}
{color:#4e9a06}Simple Java example to reproduce attached.{color}
{color:#4e9a06}Looks like a race condition involved.{color}
{color:#4e9a06}SELECT ?label WHERE { {color}
{color:#4e9a06}?object <http://www.w3.org/2000/01/rdf-schema#label> ?label .{color}
{color:#4e9a06}} ORDER BY ASC(?label){color}
{color:#4e9a06}java.lang.IllegalArgumentException: Comparison method violates its general contract!
win
at java.base/java.util.TimSort.mergeLo(TimSort.java:781)
at java.base/java.util.TimSort.mergeAt(TimSort.java:518)
at java.base/java.util.TimSort.mergeCollapse(TimSort.java:448)
at java.base/java.util.TimSort.sort(TimSort.java:245)
at java.base/java.util.Arrays.sort(Arrays.java:1441)
at org.apache.jena.atlas.data.AbortableComparator.abortableSort(AbortableComparator.java:57)
at org.apache.jena.atlas.data.SortedDataBag.iterator(SortedDataBag.java:205)
at org.apache.jena.atlas.data.SortedDataBag.iterator(SortedDataBag.java:192)
at org.apache.jena.sparql.engine.iterator.QueryIterSort$SortedBindingIterator.initializeIterator(QueryIterSort.java:88)
at org.apache.jena.atlas.iterator.IteratorDelayedInitialization.init(IteratorDelayedInitialization.java:38)
at org.apache.jena.atlas.iterator.IteratorDelayedInitialization.hasNext(IteratorDelayedInitialization.java:48)
at org.apache.jena.sparql.engine.iterator.QueryIterPlainWrapper.hasNextBinding(QueryIterPlainWrapper.java:59)
at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at org.apache.jena.sparql.engine.iterator.QueryIterConvert.hasNextBinding(QueryIterConvert.java:58)
at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:38)
at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:38)
at org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at org.apache.jena.sparql.exec.RowSetStream.hasNext(RowSetStream.java:47)
at org.apache.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:81)
at javaBug.JenaBug.isReproduced(JenaBug.java:61)
at javaBug.JenaBug.main(JenaBug.java:47){color}
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