{"_yql_row_spec"={
    "Type"=["StructType";[
        ["key";["DataType";"String"]];
        ["subkey";["DataType";"String"]];
        ["_rest";["OptionalType";["DataType";"Yson"]]]
    ]];
    "SortDirections"=[1;1;];
    "SortedBy"=["key";"subkey";];
    "SortedByTypes"=[["DataType";"String";];["DataType";"String";];];
    "SortMembers"=["key";"subkey";];
    "DefaultValues"={"key"="\"\"";"subkey"="\"\"";}
}}