code: func (s *lockBasedTxSimulator) GetPrivateDataRangeScanIterator(namespace, collection, startKey, endKey string) (commonledger.ResultsIterator, error) {
  	if err := s.checkBeforePvtdataQueries(); err != nil {
  		return nil, err
  	}
  	return s.lockBasedQueryExecutor.GetPrivateDataRangeScanIterator(namespace, collection, startKey, endKey)
  }
docs: // GetPrivateDataRangeScanIterator implements method in interface `ledger.TxSimulator`