ydb/yt/yql/tests/sql/suites/ytflow/output.txt.attr

{
    "_yql_row_spec" = {
        "Type" = [
            "StructType";
            [
                [
                    "value";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "String"
                        ]
                    ]
                ];
                [
                    "codec";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "String"
                        ]
                    ]
                ];
                [
                    "dummy";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "String"
                        ]
                    ]
                ];
            ]
        ]
    };
    "dynamic" = %true;
}