code: func (q *lockBasedQueryExecutor) GetPrivateDataRangeScanIterator(namespace, collection, startKey, endKey string) (commonledger.ResultsIterator, error) {
  	return q.helper.getPrivateDataRangeScanIterator(namespace, collection, startKey, endKey)
  }
docs: // GetPrivateDataRangeScanIterator implements method in interface `ledger.QueryExecutor`