code: def continuous(self):
          
          field_name = self.name
          new_df = copy_df(self)
          new_df._perform_operation(op.FieldContinuityOperation({field_name: True}))
          return new_df
docs: Set sequence to be continuous.
  
          :rtype: Column
  
          :Example:
  
          >>> # Table schema is create table test(f1 double, f2 string)
          >>> # Original continuity: f1=DISCRETE, f2=DISCRETE
          >>> # Now we want to set ``f1`` and ``f2`` into continuous
          >>> new_ds = df.continuous('f1 f2')