def _create_index(self, model_class, fields, unique=False):
        clause = super(PostgresqlExtCompiler, self)._create_index(
            model_class, fields, unique)
        # Allow fields to specify a type of index.  HStore and Array fields
        # may want to use GiST indexes, for example.
        index_type = None
        for field in fields:
            if isinstance(field, IndexedFieldMixin):
                index_type = field.index_type
        if index_type:
            clause.nodes.insert(-1, SQL(index_type % 'USING %s'))
        return clause
dataset/ETHPy150Open coleifer/peewee/playhouse/postgres_ext.py/PostgresqlExtCompiler._create_index/swapped operands of `%`