code: def filter_values(column, default=None):
      
      form_data = json.loads(request.form.get('form_data', '{}'))
      return_val = []
      for filter_type in ['filters', 'extra_filters']:
          if filter_type not in form_data:
              continue
  
          for f in form_data[filter_type]:
              if f['col'] == column:
                  for v in f['val']:
                      return_val.append(v)
  
      if return_val:
          return return_val
  
      if default:
          return [default]
      else:
          return []
docs: Gets a values for a particular filter as a list
  
      This is useful if:
          - you want to use a filter box to filter a query where the name of filter box
            column doesn't match the one in the select statement
          - you want to have the ability for filter inside the main query for speed purposes
  
      This searches for "filters" and "extra_filters" in form_data for a match
  
      Usage example:
          SELECT action, count(*) as times
          FROM logs
          WHERE action in ( {{ "'" + "','".join(filter_values('action_type')) + "'" }} )
          GROUP BY 1
  
      :param column: column/filter name to lookup
      :type column: str
      :param default: default value to return if there's no matching columns
      :type default: str
      :return: returns a list of filter values
      :type: list