code: def diff_column(self, column1, column2):
          
          properties1 = column1.to_dict()
          properties2 = column2.to_dict()
  
          changed_properties = []
  
          for prop in ['type', 'notnull', 'unsigned', 'autoincrement']:
              if properties1[prop] != properties2[prop]:
                  changed_properties.append(prop)
  
          if properties1['default'] != properties2['default']\
                  or (properties1['default'] is None and properties2['default'] is not None)\
                  or (properties2['default'] is None and properties1['default'] is not None):
              changed_properties.append('default')
  
          if properties1['type'] == 'string' and properties1['type'] != 'guid'\
                  or properties1['type'] in ['binary', 'blob']:
              length1 = properties1['length'] or 255
              length2 = properties2['length'] or 255
  
              if length1 != length2:
                  changed_properties.append('length')
  
              if properties1['fixed'] != properties2['fixed']:
                  changed_properties.append('fixed')
          elif properties1['type'] in ['decimal', 'float', 'double precision']:
              precision1 = properties1['precision'] or 10
              precision2 = properties2['precision'] or 10
  
              if precision1 != precision2:
                  changed_properties.append('precision')
  
              if properties1['scale'] != properties2['scale']:
                  changed_properties.append('scale')
  
          return list(set(changed_properties))
docs: Returns the difference between column1 and column2
  
          :type column1: eloquent.dbal.column.Column
          :type column2: eloquent.dbal.column.Column
  
          :rtype: list