<!--
为了方便我们能够复现和修复 bug,请遵从下面的规范描述您的问题。
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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)] -->

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