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### One-line summary [问题简述]

```
option = {
    legend: {},
    tooltip: {},
    dataset: {
        dimension:['name','value'],
        source: [
            ['10', 52.2],
            ['20', 43.3],
            ['30', 83.1],
            ['40', 86.4],
            ['50', 72.4]
        ]
    },
    xAxis: {type: 'category'},
    yAxis: {},
    series: [
        {type: 'pie'}
    ]
};
```

通过dataset这种方式渲染pie图,如果source中第一个值(name)为数字时,pie图渲染时取得是这个name的值,而不是value

### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]:4.0
+ Browser version [浏览器类型和版本]:版本 68.0.3440.106(正式版本) (32 位)
+ OS Version [操作系统类型和版本]:win7

### Expected behaviour [期望结果]

```
dataset: {
        dimension:['name','value'],
        source: [
            ['10', 52.2],
            ['20', 43.3],
            ['30', 83.1],
            ['40', 86.4],
            ['50', 72.4]
        ]
    }
```
当dataset的name值为数字时,也能正常渲染,既渲染时获取的value的值而不是现在的name的值

### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option,注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {
legend: {},
    tooltip: {},
    dataset: {
        dimension:['name','value'],
        source: [
            ['10', 52.2],
            ['20', 43.3],
            ['30', 83.1],
            ['40', 86.4],
            ['50', 72.4]
        ]
    },
    xAxis: {type: 'category'},
    yAxis: {},
    
    series: [
        {type: 'pie'}
    ]
}

```

### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如,截图或线上实例 (JSFiddle/JSBin/Codepen)] -->

![_20180907100348](https://user-images.githubusercontent.com/6880488/45194383-561dfb00-b285-11e8-8352-73ac108173d8.png)


[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9028 ]
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