[
    {
        "Write" = [
            {
                "Data" = [
                    [
                        "BAR";
                        "1";
                        "20";
                        [
                            "60"
                        ]
                    ];
                    [
                        "BAR";
                        "1";
                        "40";
                        [
                            "60"
                        ]
                    ];
                    [
                        "BAR";
                        "2";
                        "60";
                        [
                            "120"
                        ]
                    ];
                    [
                        "FOO";
                        "0";
                        "10";
                        [
                            "50"
                        ]
                    ];
                    [
                        "FOO";
                        "0";
                        "40";
                        [
                            "50"
                        ]
                    ];
                    [
                        "FOO";
                        "1";
                        "10";
                        [
                            "60"
                        ]
                    ];
                    [
                        "FOO";
                        "2";
                        "50";
                        [
                            "110"
                        ]
                    ];
                    [
                        "WAT";
                        "1";
                        "50";
                        [
                            "50"
                        ]
                    ];
                    [
                        "WAT";
                        "2";
                        "40";
                        [
                            "90"
                        ]
                    ]
                ];
                "Type" = [
                    "ListType";
                    [
                        "StructType";
                        [
                            [
                                "value";
                                [
                                    "DataType";
                                    "String"
                                ]
                            ];
                            [
                                "key";
                                [
                                    "DataType";
                                    "String"
                                ]
                            ];
                            [
                                "subkey";
                                [
                                    "DataType";
                                    "String"
                                ]
                            ];
                            [
                                "subkey_sum";
                                [
                                    "OptionalType";
                                    [
                                        "DataType";
                                        "Int64"
                                    ]
                                ]
                            ]
                        ]
                    ]
                ]
            }
        ]
    }
]