Program: 11227
Project: 11227
Buggy source:
@Override public com.stratio.meta.common.result.QueryResult execute(LogicalWorkflow workflow) throws UnsupportedException, ExecutionException {
  if (workflow.getInitialSteps().size() > 1) {
    throw new UnsupportedException("String_Node_Str");
  }
 else {
    LogicalStep logicalStep=workflow.getInitialSteps().get(0);
    while (logicalStep != null) {
      if (logicalStep instanceof TransformationStep) {
        TransformationStep transformation=(TransformationStep)logicalStep;
        if (transformation instanceof Project) {
          Project project=(Project)transformation;
          session=sessions.get(project.getClusterName().getName());
          tableName=project.getTableName();
          catalogInc=tableName.isCompletedName();
          if (catalogInc) {
            CatalogName catalogName=tableName.getCatalogName();
            catalog=catalogName.getName();
          }
          selectionClause=project.getColumnList();
        }
 else {
          if (transformation instanceof Filter) {
            Filter filter=(Filter)transformation;
            whereInc=true;
            Relation relation=filter.getRelation();
            where.add(relation);
          }
 else           if (transformation instanceof Limit) {
            Limit limitClause=(Limit)transformation;
            limit=limitClause.getLimit();
          }
 else {
            if (transformation instanceof Select) {
              Select select=(Select)transformation;
              aliasColumns=select.getColumnMap();
            }
          }
        }
      }
      logicalStep=logicalStep.getNextStep();
    }
  }
  String query=parseQuery();
  Result result=null;
  if (session != null) {
    if (aliasColumns.isEmpty()) {
      result=CassandraExecutor.execute(query,session);
    }
 else {
      result=CassandraExecutor.execute(query,aliasColumns,session);
    }
  }
 else {
    throw new ExecutionException("String_Node_Str");
  }
  if (result.hasError()) {
    ErrorResult error=(ErrorResult)result;
switch (error.getType()) {
case EXECUTION:
      throw new ExecutionException(error.getErrorMessage());
case NOT_SUPPORTED:
    throw new UnsupportedException(error.getErrorMessage());
case CRITICAL:
  throw new CriticalExecutionException(error.getErrorMessage());
default :
throw new UnsupportedException(error.getErrorMessage());
}
}
 else {
return (QueryResult)result;
}
}

Fixed version (ground truth):
@Override public com.stratio.meta.common.result.QueryResult execute(LogicalWorkflow workflow) throws UnsupportedException, ExecutionException {
  LogicalStep logicalStep=workflow.getInitialSteps().get(0);
  while (logicalStep != null) {
    if (logicalStep instanceof TransformationStep) {
      getTransformationStep(logicalStep);
    }
    logicalStep=logicalStep.getNextStep();
  }
  String query=parseQuery();
  Result result;
  if (session != null) {
    if (aliasColumns.isEmpty()) {
      result=CassandraExecutor.execute(query,session);
    }
 else {
      result=CassandraExecutor.execute(query,aliasColumns,session);
    }
  }
 else {
    throw new ExecutionException("String_Node_Str");
  }
  if (result.hasError()) {
    ErrorResult error=(ErrorResult)result;
    getTypeErrorException(error);
  }
  return (QueryResult)result;
}