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FedBench fails with FedX 3.1 - issue needed to be reported according to debug output! 

What steps will reproduce the problem?
1. Use the latest built of Fedbench 3.0
2. Install and configure FedX 3.1 as a benchmark driver
3. Run a benchmark with chembl and drugbank with the following query (each 
dataset on a seperate SPARQL endpoint)

SELECT ?val (COUNT(DISTINCT ?id) as ?vc)
WHERE
{
  ?original <http://rdf.ebi.ac.uk/terms/chembl#highestDevelopmentPhase> ?val.
  {
    SELECT ?original ?id
    WHERE
    {
      ?original <http://ns.ontoforce.com/2013/disqover#preferredUri> ?id.
      ?original_1 ?facet_source_1 ?facet_value_1.
      FILTER(?facet_source_1 = <http://ns.ontoforce.com/ontologies/drugbank/manufacturer>)
      FILTER(?facet_value_1 = "Sandoz inc"^^<http://www.w3.org/2001/XMLSchema#string>)
      ?original_2 ?facet_source_2 ?facet_value_2.
      FILTER(?facet_source_2 = <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>)
      FILTER (?facet_value_2 IN (<http://ns.ontoforce.com/ontologies/dailymed/Drug>, <http://ns.ontoforce.com/ontologies/unii/Substance>, <http://ns.ontoforce.com/ontologies/pubmed/Chemical>, <http://ns.ontoforce.com/ontologies/hsdb/Compound>, <http://ns.ontoforce.com/ontologies/drugbank/Drug>, <http://rdf.ebi.ac.uk/terms/chembl#SmallMoleculeTarget>, <http://rdf.ebi.ac.uk/terms/chembl#SmallMolecule>, <http://ns.ontoforce.com/ontologies/integration_ontology#DrugIntervention>, <http://rdf.ebi.ac.uk/terms/chembl#Synthetic>, <http://rdf.ebi.ac.uk/terms/chembl#NaturalProductDerived>, <http://rdf.ebi.ac.uk/terms/chembl#Inorganic>))
      ?original_3 <materialization:containsText> "migraine".
      ?original_1 <http://ns.ontoforce.com/2013/disqover#preferredUri> ?id.
      ?original_2 <http://ns.ontoforce.com/2013/disqover#preferredUri> ?id.
      ?original_3 <http://ns.ontoforce.com/2013/disqover#preferredUri> ?id.
    }
  }
  UNION
  {
    SELECT ?original (?original as ?id)
    WHERE
    {
      ?original ?facet_source_3 ?facet_value_3.
      FILTER(?facet_source_3 = <http://ns.ontoforce.com/ontologies/drugbank/manufacturer>)
      FILTER(?facet_value_3 = "Sandoz inc"^^<http://www.w3.org/2001/XMLSchema#string>)
      ?original ?facet_source_4 ?facet_value_4.
      FILTER(?facet_source_4 = <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>)
      FILTER (?facet_value_4 IN (<http://ns.ontoforce.com/ontologies/dailymed/Drug>, <http://ns.ontoforce.com/ontologies/unii/Substance>, <http://ns.ontoforce.com/ontologies/pubmed/Chemical>, <http://ns.ontoforce.com/ontologies/hsdb/Compound>, <http://ns.ontoforce.com/ontologies/drugbank/Drug>, <http://rdf.ebi.ac.uk/terms/chembl#SmallMoleculeTarget>, <http://rdf.ebi.ac.uk/terms/chembl#SmallMolecule>, <http://ns.ontoforce.com/ontologies/integration_ontology#DrugIntervention>, <http://rdf.ebi.ac.uk/terms/chembl#Synthetic>, <http://rdf.ebi.ac.uk/terms/chembl#NaturalProductDerived>, <http://rdf.ebi.ac.uk/terms/chembl#Inorganic>))
      ?original <materialization:containsText> "migraine".
      OPTIONAL
      {
        ?original <http://ns.ontoforce.com/2013/disqover#preferredUri> ?identifier.
      }
      FILTER(!BOUND(?identifier))
    }
  }
  ?original <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://rdf.ebi.ac.uk/terms/chembl#SmallMolecule>.
}
GROUP BY ?val
ORDER BY DESC(?vc)
LIMIT 15


What is the expected output? What do you see instead?

# Get the number of drugs per development phase having "migraine"
# in their description, for manufacturer "Sandoz inc".
# Phases come from chembl, manufacturers come from drugbank.
#
# Time: ~0.4s
# Expected result:
#   "val","vc"
#   4,11
#   0,1

This is the error, I see instead:

[EVAL] - executing query custom1_4 (#2) ...
 WARN [main] (JoinOrderOptimizer.java:178) - No cost estimation for Projection available.
 WARN [main] (JoinOrderOptimizer.java:178) - No cost estimation for Projection available.
 WARN [main] (JoinOrderOptimizer.java:178) - No cost estimation for Projection available.
 WARN [main] (JoinOrderOptimizer.java:178) - No cost estimation for Projection available.
ERROR [main] (FedXConnection.java:102) - Exception occured during optimization.
com.fluidops.fedx.exception.FedXRuntimeException: Type Projection not supported 
for cost estimation. If you run into this, please report a bug.
    at com.fluidops.fedx.optimizer.JoinOrderOptimizer.getFreeVars(JoinOrderOptimizer.java:158)
    at com.fluidops.fedx.optimizer.JoinOrderOptimizer.getFreeVars(JoinOrderOptimizer.java:132)
    at com.fluidops.fedx.optimizer.JoinOrderOptimizer.optimizeJoinOrder(JoinOrderOptimizer.java:80)
    at com.fluidops.fedx.optimizer.StatementGroupOptimizer.meetNJoin(StatementGroupOptimizer.java:171)
    at com.fluidops.fedx.optimizer.StatementGroupOptimizer.meetOther(StatementGroupOptimizer.java:79)
    at com.fluidops.fedx.algebra.NJoin.visit(NJoin.java:49)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Group.visitChildren(Group.java:134)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:268)
    at org.openrdf.query.algebra.Group.visit(Group.java:127)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Extension.visitChildren(Extension.java:112)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:244)
    at org.openrdf.query.algebra.Extension.visit(Extension.java:101)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Order.visitChildren(Order.java:100)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:448)
    at org.openrdf.query.algebra.Order.visit(Order.java:89)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Projection.visitChildren(Projection.java:87)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:460)
    at org.openrdf.query.algebra.Projection.visit(Projection.java:79)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:520)
    at org.openrdf.query.algebra.Slice.visit(Slice.java:96)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:478)
    at org.openrdf.query.algebra.QueryRoot.visit(QueryRoot.java:57)
    at com.fluidops.fedx.optimizer.StatementGroupOptimizer.optimize(StatementGroupOptimizer.java:66)
    at com.fluidops.fedx.optimizer.Optimizer.optimize(Optimizer.java:108)
    at com.fluidops.fedx.FedXConnection.evaluateInternal(FedXConnection.java:100)
    at org.openrdf.sail.helpers.SailConnectionBase.evaluate(SailConnectionBase.java:292)
    at org.openrdf.repository.sail.SailTupleQuery.evaluate(SailTupleQuery.java:60)
    at org.semanticweb.fbench.evaluation.SesameEvaluation.runQuery(SesameEvaluation.java:67)
    at org.semanticweb.fbench.evaluation.SesameSparqlEvaluation.runQuery(SesameSparqlEvaluation.java:81)
    at org.semanticweb.fbench.evaluation.FedXSparqlEvaluation.runQuery(FedXSparqlEvaluation.java:119)
    at org.semanticweb.fbench.evaluation.Evaluation.runMultiEval(Evaluation.java:160)
    at org.semanticweb.fbench.evaluation.Evaluation.run(Evaluation.java:91)
    at org.semanticweb.fbench.FederationEval.main(FederationEval.java:63)
[EVAL] - custom1_4 (#2, duration: -2ms, results -1)
ERROR [main] (Evaluation.java:167) - Error executing query custom1_4 
(QueryEvaluationException): com.fluidops.fedx.exception.FedXRuntimeException: 
Type Projection not supported for cost estimation. If you run into this, please 
report a bug.
DEBUG [main] (Evaluation.java:168) - Exception details:
org.openrdf.query.QueryEvaluationException: 
com.fluidops.fedx.exception.FedXRuntimeException: Type Projection not supported 
for cost estimation. If you run into this, please report a bug.
    at org.openrdf.repository.sail.SailTupleQuery.evaluate(SailTupleQuery.java:67)
    at org.semanticweb.fbench.evaluation.SesameEvaluation.runQuery(SesameEvaluation.java:67)
    at org.semanticweb.fbench.evaluation.SesameSparqlEvaluation.runQuery(SesameSparqlEvaluation.java:81)
    at org.semanticweb.fbench.evaluation.FedXSparqlEvaluation.runQuery(FedXSparqlEvaluation.java:119)
    at org.semanticweb.fbench.evaluation.Evaluation.runMultiEval(Evaluation.java:160)
    at org.semanticweb.fbench.evaluation.Evaluation.run(Evaluation.java:91)
    at org.semanticweb.fbench.FederationEval.main(FederationEval.java:63)
Caused by: org.openrdf.sail.SailException: 
com.fluidops.fedx.exception.FedXRuntimeException: Type Projection not supported 
for cost estimation. If you run into this, please report a bug.
    at com.fluidops.fedx.FedXConnection.evaluateInternal(FedXConnection.java:103)
    at org.openrdf.sail.helpers.SailConnectionBase.evaluate(SailConnectionBase.java:292)
    at org.openrdf.repository.sail.SailTupleQuery.evaluate(SailTupleQuery.java:60)
    ... 6 more
Caused by: com.fluidops.fedx.exception.FedXRuntimeException: Type Projection 
not supported for cost estimation. If you run into this, please report a bug.
    at com.fluidops.fedx.optimizer.JoinOrderOptimizer.getFreeVars(JoinOrderOptimizer.java:158)
    at com.fluidops.fedx.optimizer.JoinOrderOptimizer.getFreeVars(JoinOrderOptimizer.java:132)
    at com.fluidops.fedx.optimizer.JoinOrderOptimizer.optimizeJoinOrder(JoinOrderOptimizer.java:80)
    at com.fluidops.fedx.optimizer.StatementGroupOptimizer.meetNJoin(StatementGroupOptimizer.java:171)
    at com.fluidops.fedx.optimizer.StatementGroupOptimizer.meetOther(StatementGroupOptimizer.java:79)
    at com.fluidops.fedx.algebra.NJoin.visit(NJoin.java:49)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Group.visitChildren(Group.java:134)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:268)
    at org.openrdf.query.algebra.Group.visit(Group.java:127)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Extension.visitChildren(Extension.java:112)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:244)
    at org.openrdf.query.algebra.Extension.visit(Extension.java:101)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Order.visitChildren(Order.java:100)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:448)
    at org.openrdf.query.algebra.Order.visit(Order.java:89)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.Projection.visitChildren(Projection.java:87)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:460)
    at org.openrdf.query.algebra.Projection.visit(Projection.java:79)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetUnaryTupleOperator(QueryModelVisitorBase.java:690)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:520)
    at org.openrdf.query.algebra.Slice.visit(Slice.java:96)
    at org.openrdf.query.algebra.UnaryTupleOperator.visitChildren(UnaryTupleOperator.java:90)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meetNode(QueryModelVisitorBase.java:662)
    at org.openrdf.query.algebra.helpers.QueryModelVisitorBase.meet(QueryModelVisitorBase.java:478)
    at org.openrdf.query.algebra.QueryRoot.visit(QueryRoot.java:57)
    at com.fluidops.fedx.optimizer.StatementGroupOptimizer.optimize(StatementGroupOptimizer.java:66)
    at com.fluidops.fedx.optimizer.Optimizer.optimize(Optimizer.java:108)
    at com.fluidops.fedx.FedXConnection.evaluateInternal(FedXConnection.java:100)
    ... 8 more

Original issue reported on code.google.com by [email protected] on 29 Jan 2015 at 10:19

skos namespace wrong for current version of DBPedia 

Hi all 

i just figured out that your namespace for the prefix skos is wrong in the 
linked data queries
e.g., 
Query LD10 
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
SELECT * WHERE {
 ?n skos:subject <http://dbpedia.org/resource/Category:Chancellors_of_Germany> .
 ?n owl:sameAs ?p2 .
 ?p2 <http://data.nytimes.com/elements/latest_use> ?u .
}
=> should be edit to 
PREFIX skos: <http://purl.org/dc/terms/>

otherwise the explorative query processing will fail

Original issue reported on code.google.com by [email protected] on 29 Nov 2011 at 2:57

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