How to use the flowetl.mixins.fixed_sql_mixin.FixedSQLMixin function in flowetl

-------
        Type
            New operator class

        """
    from flowetl.mixins.fixed_sql_mixin import FixedSQLMixin
    from flowetl.mixins.table_name_macros_mixin import TableNameMacrosMixin

    if is_sensor:
        from airflow.sensors.sql_sensor import SqlSensor as op_base
    else:
        from airflow.operators.postgres_operator import PostgresOperator as op_base

    return type(
        class_name,
        (TableNameMacrosMixin, ParamsMixin, FixedSQLMixin, op_base),
        dict(fixed_sql=sql, named_params=params),
    )