/home/runner/.ya/build/build_root/7lz5/004c7a/ydb/library/yql/tests/sql/dq_file/part19/test-results/pytest/testing_out_stuff/chunk6/testing_out_stuff/yql/yqlrun_9xymK5/program.sql:<main>: Error: Optimization

    /home/runner/.ya/build/build_root/7lz5/004c7a/ydb/library/yql/tests/sql/dq_file/part19/test-results/pytest/testing_out_stuff/chunk6/testing_out_stuff/yql/yqlrun_9xymK5/program.sql:<main>:10:16: Error: Cannot execute ScriptUdf over stream/flow inside DQ stage
    	$udf = Python::Len(Callable<(String, Stream<String>)->Struct<value:Uint32>>, $udfScript);
	               ^
