ValidationConstraintFailedException does not contain lastName column

[palagdan]

In the constraint-validation example, after the pipeline fails, the ValidationConstraintFailedException does not contain lastName due to strange bindings.

 private void checkConstraints(Model model, QuerySolution bindings, List<Resource> constraintQueries) 

[palagdan]

I changed the for loop to traverse through all variables(not in solution, in resultSet), but I found out that lastName is empty.

    ResultSet rs = execution.execSelect();
                constraintViolated = rs.hasNext();
                if(constraintViolated){
                    for(int i = 0; i < ExecutionConfig.getEvidenceNumber() && rs.hasNext(); i++){
                        QuerySolution solution = rs.next() ;
                        Map<String, RDFNode> evidenceMap = new LinkedHashMap<>();
                        for (String varName : rs.getResultVars()) {
                            RDFNode value = solution.get(varName);
                            if (value != null) {
                                evidenceMap.put(varName, value);
                            } else {
                                evidenceMap.put(varName, model.createLiteral("")); 
                            }
                        }
                        evidences.add(evidenceMap);
                    }
                }

[blcham]

see my comment in PR #270