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### One-line summary [问题简述]
parallelAxis: [
{dim: 0, name: schema[0].text},
{dim: 1, name: schema[1].text},
{dim: 2, name: schema[2].text},
{dim: 3, name: schema[3].text},
{dim: 4, name: schema[4].text},
{dim: 5, name: schema[5].text},
{dim: 6, name: schema[6].text,
type: 'category', data: ['优', '良', '轻度', '中度', '重度', '严重']
},
{dim: 7, name: schema[7].text,
type: 'category', data: ["北京", "上海", "广州"]
}
],
chart 显示正常， 不过在选择第八个坐标城市的时候， 前面维度的数据没有任何显示。
去掉两个其中一category坐标轴，选取另外一个category，其他维度数据显示正常。
难道不不支持多category坐标轴选取数据？
bug 重现地址 http://echarts.baidu.com/examples/editor.html?c=scatter-matrix
option 中的parallelAxis : [
{dim: 0, name: schema[0].text},
{dim: 1, name: schema[1].text},
{dim: 2, name: schema[2].text},
{dim: 3, name: schema[3].text},
{dim: 4, name: schema[4].text},
{dim: 5, name: schema[5].text},
{dim: 6, name: schema[6].text,
type: 'category', data: ['优', '良', '轻度', '中度', '重度', '严重']
},
{dim: 7, name: schema[7].text,
type: 'category', data: ["北京", "上海", "广州"]
}
],
var schema = [
{name: 'AQIindex', index: 1, text: 'AQI'},
{name: 'PM25', index: 2, text: 'PM 2.5'},
{name: 'PM10', index: 3, text: 'PM 10'},
{name: 'CO', index: 4, text: 'CO'},
{name: 'NO2', index: 5, text: 'NO₂'},
{name: 'SO2', index: 6, text: 'SO₂'},
{name: '等级', index: 7, text: '等级'},
{name: 'city', index: 8, text: 'city'}
];
### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]:
+ Browser version [浏览器类型和版本]:
+ OS Version [操作系统类型和版本]:
### Expected behaviour [期望结果]
### 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 = {
}
```
### 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/8918 ]
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