ydb/yt/yql/tests/sql/suites/stream_lookup_join/input.txt.attr

{
    "_yql_row_spec"={
        "Type"=["StructType";[
            ["key"; ["DataType"; "String"]];
            ["subkey"; ["DataType"; "String"]];
            ["value"; ["DataType"; "String"]];
        ]];
        "SortMembers"=["key"; "subkey"];
        "SortedBy"=["key"; "subkey"];
        "SortDirections"=[1; 1];
        "SortedByTypes"=[["DataType";"String"]; ["DataType";"String"]]
    };
}