{"_yql_row_spec"={
    "Type"=["StructType";[
        ["key";["DataType";"Int64"]];
        ["subkey";["DataType";"String"]];
        ["value";["DataType";"String"]]
    ]];
    "SortDirections"=[1];
    "SortedBy"=["key"];
    "SortedByTypes"=[["DataType";"Int64";]];
    "SortMembers"=["key"];
}}