Shawn Smith created JENA-1523:
---------------------------------
Summary: "VARS requires a list of variables" exception w/spilling
and renamed vars
Key: JENA-1523
URL: https://issues.apache.org/jira/browse/JENA-1523
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 3.7.0
Reporter: Shawn Smith
Spilling a {{DistinctDataBag}} or {{SortedDataBag}} when executing SPARQL
queries that are modified by {{TransformScopeRename}} can result in the
following:
{noformat}
org.apache.jena.riot.RiotException: [line: 1, col: 7 ] VARS requires a list of
variables (found '[SLASH]')
at
org.apache.jena.riot.system.ErrorHandlerFactory$ErrorHandlerStd.fatal(ErrorHandlerFactory.java:147)
at org.apache.jena.riot.lang.LangEngine.raiseException(LangEngine.java:148)
at org.apache.jena.riot.lang.LangEngine.exceptionDirect(LangEngine.java:143)
at org.apache.jena.riot.lang.LangEngine.exception(LangEngine.java:137)
at
org.apache.jena.sparql.engine.binding.BindingInputStream.access$1900(BindingInputStream.java:64)
at
org.apache.jena.sparql.engine.binding.BindingInputStream$IteratorTuples.directiveVars(BindingInputStream.java:227)
at
org.apache.jena.sparql.engine.binding.BindingInputStream$IteratorTuples.directives(BindingInputStream.java:140)
at
org.apache.jena.sparql.engine.binding.BindingInputStream$IteratorTuples.<init>(BindingInputStream.java:129)
at
org.apache.jena.sparql.engine.binding.BindingInputStream.<init>(BindingInputStream.java:99)
at
org.apache.jena.sparql.engine.binding.BindingInputStream.<init>(BindingInputStream.java:78)
at
org.apache.jena.sparql.engine.binding.BindingInputStream.<init>(BindingInputStream.java:73)
at
org.apache.jena.riot.system.SerializationFactoryFinder$1.createDeserializer(SerializationFactoryFinder.java:56)
at
org.apache.jena.atlas.data.SortedDataBag.getInputIterator(SortedDataBag.java:190)
at org.apache.jena.atlas.data.SortedDataBag.iterator(SortedDataBag.java:235)
at org.apache.jena.atlas.data.SortedDataBag.iterator(SortedDataBag.java:206)
at
org.apache.jena.atlas.data.DistinctDataBag.iterator(DistinctDataBag.java:94){noformat}
The problem is that renaming variables prepends a "/" so that, for example, the
first line of the spill file might look like the following which
{{BindingInputStream.directiveVars()}} can't parse:
{noformat}
VARS ?/.1 ?/.0 ?v_2 ?v_21 ?v_1 .{noformat}
Here's a test case that reproduces the exception:
{noformat}
@Test
public void testWithRenamedVars() {
ExprVar expr = (ExprVar) Rename.renameVars(new ExprVar("1"),
Collections.emptySet());
BindingMap binding = BindingFactory.create();
binding.add(expr.asVar(), NodeFactory.createLiteral("foo"));
SortedDataBag<Binding> dataBag = BagFactory.newSortedBag(
new ThresholdPolicyCount<>(0),
SerializationFactoryFinder.bindingSerializationFactory(),
new BindingComparator(new ArrayList<>()));
try {
dataBag.add(binding);
dataBag.flush();
// Spill file looks like the following:
// VARS ?/1 .
// "foo" .
Binding actual = dataBag.iterator().next();
assertEquals(binding, actual);
} finally {
dataBag.close();
}
}
{noformat}
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