PivotGroup

{
    "dataSourceColumnReference": {
        "name": "string"
    },
    "groupLimit": {
        "applyOrder": 0,
        "countLimit": 0
    },
    "groupRule": {
        "dateTimeRule": {},
        "histogramRule": {},
        "manualRule": {}
    },
    "label": "string",
    "repeatHeadings": true,
    "showTotals": true,
    "sortOrder": "SORT_ORDER_UNSPECIFIED",
    "sourceColumnOffset": 0,
    "valueBucket": {
        "buckets": [
            {
                "boolValue": true,
                "errorValue": {
                    "message": "string",
                    "type": "ERROR_TYPE_UNSPECIFIED"
                },
                "formulaValue": "string",
                "numberValue": 0,
                "stringValue": "string"
            }
        ],
        "valuesIndex": 0
    },
    "valueMetadata": [
        {
            "collapsed": true,
            "value": {
                "boolValue": true,
                "errorValue": {
                    "message": "string",
                    "type": "ERROR_TYPE_UNSPECIFIED"
                },
                "formulaValue": "string",
                "numberValue": 0,
                "stringValue": "string"
            }
        }
    ]
}