def to_map(self, dbcols):
        dct = self._base_map()
        if dct['access_method'] == 'btree':
            del dct['access_method']
        del dct['_table']
        dct['columns'] = [dbcols[k - 1] for k in self.col_idx]
        del dct['col_idx']
        return {self.name: dct}
Return an ordered list of the current contenders in the
dataset/ETHPy150Open perseas/Pyrseas/pyrseas/dbobject/constraint.py/PrimaryKey.to_map--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/kazoo-2.0/kazoo/recipe/election.py/Election.contenders