/**
  * Adds the entity result mapping of the results of native SQL queries to the result set.
  * 
  * @param ClassMetadataInfo $classMetadata
  * @param array $entityMapping
  * @param string $alias
  * @return ResultSetMappingBuilder
  */
 public function addNamedNativeQueryEntityResultMapping(ClassMetadataInfo $classMetadata, array $entityMapping, $alias)
 {
     if (isset($entityMapping['discriminatorColumn']) && $entityMapping['discriminatorColumn']) {
         $discriminatorColumn = $entityMapping['discriminatorColumn'];
         $this->setDiscriminatorColumn($alias, $discriminatorColumn);
         $this->addMetaResult($alias, $discriminatorColumn, $discriminatorColumn);
     }
     if (isset($entityMapping['fields']) && !empty($entityMapping['fields'])) {
         foreach ($entityMapping['fields'] as $field) {
             $fieldName = $field['name'];
             $relation = null;
             if (strpos($fieldName, '.')) {
                 list($relation, $fieldName) = explode('.', $fieldName);
             }
             if (isset($classMetadata->associationMappings[$relation])) {
                 if ($relation) {
                     $associationMapping = $classMetadata->associationMappings[$relation];
                     $joinAlias = $alias . $relation;
                     $parentAlias = $alias;
                     $this->addJoinedEntityResult($associationMapping['targetEntity'], $joinAlias, $parentAlias, $relation);
                     $this->addFieldResult($joinAlias, $field['column'], $fieldName);
                 } else {
                     $this->addFieldResult($alias, $field['column'], $fieldName, $classMetadata->name);
                 }
             } else {
                 if (!isset($classMetadata->fieldMappings[$fieldName])) {
                     throw new \InvalidArgumentException("Entity '" . $classMetadata->name . "' has no field '" . $fieldName . "'. ");
                 }
                 $this->addFieldResult($alias, $field['column'], $fieldName, $classMetadata->name);
             }
         }
     } else {
         foreach ($classMetadata->getColumnNames() as $columnName) {
             $propertyName = $classMetadata->getFieldName($columnName);
             $this->addFieldResult($alias, $columnName, $propertyName);
         }
     }
     return $this;
 }