{
    "_yql_row_spec" = {
        "Type" = [
            "StructType";
            [
                [
                    "$timestamp";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "Uint64"
                        ]
                    ];
                ];
                [
                    "$cumulative_data_weight";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "Int64"
                        ]
                    ];
                ];
                [
                    "string_field";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "String"
                        ]
                    ];
                ];
                [
                    "int64_field";
                    [
                        "OptionalType";
                        [
                            "DataType";
                            "Int64"
                        ]
                    ];
                ];
            ]
        ]
    };
    "_yql_dynamic" = %true;
    "_yql_dynamic_native_write" = %true;
}