Function retrieveRawValue

libs/echarts/echarts.simple.js:23378–23401

* @param {module:echarts/data/List} data * @param {number} dataIndex * @param {string|number} [dim] dimName or dimIndex * @return {Array. |string|number} can be null/undefined.

(data, dataIndex, dim)

 * @return {Array.<number>|string|number} can be null/undefined.
 */
function retrieveRawValue(data, dataIndex, dim) {
    if (!data) {
        return;
    }

    // Consider data may be not persistent.
    var dataItem = data.getRawDataItem(dataIndex);

    if (dataItem == null) {
        return;
    }

    var sourceFormat = data.getProvider().getSource().sourceFormat;
    var dimName;
    var dimIndex;

    var dimInfo = data.getDimensionInfo(dim);
    if (dimInfo) {
        dimName = dimInfo.name;
        dimIndex = dimInfo.index;
    }

    return rawValueGetters[sourceFormat](dataItem, dataIndex, dimIndex, dimName);
}

/**
 * Compatible with some cases (in pie, map) like: