getIterationInfo() protected method

protected getIterationInfo ( ) : array
return array
 /**
  * @return array
  */
 protected function getIterationInfo()
 {
     $iterationInfo = parent::getIterationInfo();
     if ($iterationInfo['started_iterating']) {
         $iterationInfo += ['firstBatchAt' => $iterationInfo['at'], 'firstBatchNumReturned' => $iterationInfo['numReturned']];
         $iterationInfo['at'] = 0;
         $iterationInfo['numReturned'] = 0;
     }
     return $iterationInfo;
 }