/**
  * Merge this QueryBuilder's SELECT into the given QueryBuilder.
  *
  * @param  QueryBuilder $QueryBuilder to merge into
  * @return QueryBuilder
  */
 public function mergeSelectInto(QueryBuilder $QueryBuilder)
 {
     foreach ($this->option as $currentOption) {
         $QueryBuilder->option($currentOption);
     }
     foreach ($this->select as $currentColumn => $currentAlias) {
         $QueryBuilder->select($currentColumn, $currentAlias);
     }
     return $QueryBuilder;
 }