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

Returns
    -------
    Type
        New operator class

    """
    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, FixedSQLMixin, op_base), dict(fixed_sql=sql),
    )