<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_relation_cols(self):
 """ Returns the filter active FilterRelation cols """

        retlst = []
        for flt, value in zip(self.filters, self.values):
            if isinstance(flt, FilterRelation) and value:
                retlst.append(flt.column_name)
        return retlst