docs: def validate_request_row_key(self, request):
          '''
          Validates that all requests have the different RowKey and adds RowKey
          to existing RowKey list.
  
          request:
              the request to insert, update or delete entity
          '''
          if self.batch_row_keys:
              if self.get_request_row_key(request) in self.batch_row_keys:
                  raise AzureBatchValidationError(_ERROR_DUPLICATE_ROW_KEY_IN_BATCH)
          else:
              self.batch_row_keys.append(self.get_request_row_key(request))