ydb/yt/yql/tests/sql/suites/schema/input_good.txt.attr

{
    "_yql_row_spec" = {
        "StrictSchema"=%true;
        "Type"=["StructType";[
            ["IsValid";["DataType";"Bool"]];
            ["dates";["ListType";["DataType";"String"]]];
            ["id1";["OptionalType";["DataType";"String"]]];
        ]];
    };
    "schema" = [
        {"required"=%false; "type"="any"; "name"="dates"};
        {"required"=%false; "type"="string"; "name"="id1"};
        {"required"=%true; "type"="boolean"; "name"="IsValid"};
    ];
}