Rob Vesse created JENA-471:
------------------------------
Summary: Regression in Algebra.toQuadForm() for nested sub-query
with GRAPH clause
Key: JENA-471
URL: https://issues.apache.org/jira/browse/JENA-471
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 2.10.1
Reporter: Rob Vesse
Our internal testing has flagged up a regression in behaviour between 2.10.0
and 2.10.1 with regards to Algebra.toQuadForm() when applied to sub-queries
nested within a GRAPH clause
The query in question is as follows:
SELECT ?x
WHERE
{ GRAPH ?g
{ { SELECT ?x
WHERE
{ ?x ?p ?g }
}
}
}
With 2.10.0 this produced the following algebra:
(project (?x)
(project (?x)
(quadpattern (quad ?g ?x ?p ?g))))
With 2.10.1 this now produces an exception:
com.hp.hpl.jena.sparql.ARQInternalErrorException
at
com.hp.hpl.jena.sparql.algebra.OpVars$OpVarsPattern.visit(OpVars.java:197)
at com.hp.hpl.jena.sparql.algebra.op.OpProject.visit(OpProject.java:48)
at
com.hp.hpl.jena.sparql.algebra.OpWalker$WalkerVisitor.visit1(OpWalker.java:86)
at
com.hp.hpl.jena.sparql.algebra.OpVisitorByType.visitModifer(OpVisitorByType.java:42)
at
com.hp.hpl.jena.sparql.algebra.OpVisitorByType.visit(OpVisitorByType.java:154)
at com.hp.hpl.jena.sparql.algebra.op.OpProject.visit(OpProject.java:48)
at com.hp.hpl.jena.sparql.algebra.OpWalker.walk(OpWalker.java:43)
at com.hp.hpl.jena.sparql.algebra.OpWalker.walk(OpWalker.java:33)
at com.hp.hpl.jena.sparql.algebra.OpVars.mentionedVars(OpVars.java:70)
at com.hp.hpl.jena.sparql.algebra.OpVars.mentionedVars(OpVars.java:62)
at
com.hp.hpl.jena.sparql.algebra.AlgebraQuad$Pusher.visit(AlgebraQuad.java:93)
at com.hp.hpl.jena.sparql.algebra.op.OpGraph.visit(OpGraph.java:46)
at
com.hp.hpl.jena.sparql.algebra.OpWalker$WalkerVisitor.before(OpWalker.java:64)
at
com.hp.hpl.jena.sparql.algebra.OpWalker$WalkerVisitor.visit1(OpWalker.java:84)
at
com.hp.hpl.jena.sparql.algebra.OpVisitorByType.visit(OpVisitorByType.java:110)
at com.hp.hpl.jena.sparql.algebra.op.OpGraph.visit(OpGraph.java:46)
at
com.hp.hpl.jena.sparql.algebra.OpWalker$WalkerVisitor.visit1(OpWalker.java:85)
at
com.hp.hpl.jena.sparql.algebra.OpVisitorByType.visitModifer(OpVisitorByType.java:42)
at
com.hp.hpl.jena.sparql.algebra.OpVisitorByType.visit(OpVisitorByType.java:154)
at com.hp.hpl.jena.sparql.algebra.op.OpProject.visit(OpProject.java:48)
at com.hp.hpl.jena.sparql.algebra.OpWalker.walk(OpWalker.java:43)
at com.hp.hpl.jena.sparql.algebra.OpWalker.walk(OpWalker.java:38)
at
com.hp.hpl.jena.sparql.algebra.Transformer.applyTransformation(Transformer.java:156)
at
com.hp.hpl.jena.sparql.algebra.Transformer.transformation(Transformer.java:149)
at
com.hp.hpl.jena.sparql.algebra.Transformer.transformation(Transformer.java:138)
at
com.hp.hpl.jena.sparql.algebra.Transformer.transformation(Transformer.java:132)
at
com.hp.hpl.jena.sparql.algebra.Transformer.transform(Transformer.java:57)
at
com.hp.hpl.jena.sparql.algebra.Transformer.transformSkipService(Transformer.java:87)
at
com.hp.hpl.jena.sparql.algebra.AlgebraQuad.quadize(AlgebraQuad.java:56)
at com.hp.hpl.jena.sparql.algebra.Algebra.toQuadForm(Algebra.java:89)
I assume this regression happens because of the change to AlgebraQuad to use
OpVars.mentionedVars() in the 2.10.1 dev cycle
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