code: def next(self, rows: List[Row]) -> List[Row]:
          
          if not rows:
              return []
          input_row_index = self._get_row_index(rows[0])
          if input_row_index < len(self.table_data) - 1 and input_row_index != -1:
              return [self.table_data[input_row_index + 1]]
          return []
docs: Takes an expression that evaluates to a single row, and returns the row that occurs after
          the input row in the original set of rows. If the input row happens to be the last row, we
          will return an empty list.