docs: def get_column(self, column_name):
          """
          Returns a column as a Series.
  
          Parameters
          ----------
          column_name : str
  
          Returns
          -------
          column : pandas.Series
  
          """
          with log_start_finish(
                  'getting single column {!r} from table {!r}'.format(
                      column_name, self.name),
                  logger):
              extra_cols = _columns_for_table(self.name)
              if column_name in extra_cols:
                  with log_start_finish(
                          'computing column {!r} for table {!r}'.format(
                              column_name, self.name),
                          logger):
                      column = extra_cols[column_name]()
              else:
                  column = self.local[column_name]
              if self.copy_col:
                  return column.copy()
              else:
                  return column