/**
  * Fetch next row into variable
  * @return bool if next row exists
  */
 public function nextRow()
 {
     if ($this->postProcessor->nextRow()) {
         $this->row =& $this->source->row;
         return true;
     } else {
         $this->row = null;
         return false;
     }
 }
 /**
  * Fetch next row into variable
  * @return bool if next row exists
  */
 public function nextRow()
 {
     if ($this->postProcessor->nextRow()) {
         $this->row =& $this->source->row;
         if (empty($this->displayColumns)) {
             $this->displayColumns =& $this->source->displayColumns;
         }
         return true;
     } else {
         $this->row = null;
         return false;
     }
 }