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```js
option = {
    angleAxis: {
    },
    radiusAxis: {
        type: 'category',
        data: ['周一', '周二', '周三', '周四']
    },
    polar: {
    },
    series: [{
        type: 'bar',
        data: [2, 3, 3, 4],
        coordinateSystem: 'polar',
        barMaxWidth:20,
        itemStyle: {
            normal: {
                barBorderRadius: 10
            }
        }
    }]
};
```

![image](https://user-images.githubusercontent.com/448208/45596837-e92d0280-b9f4-11e8-9da1-dc42546b1db9.png)


### 笛卡尔坐标系正常

```js
option = {
    yAxis: {
    },
    xAxis: {
        type: 'category',
        data: ['周一', '周二', '周三', '周四']
    },
    series: [{
        type: 'bar',
        data: [2, 3, 3, 4],
        barMaxWidth:20,
        itemStyle: {
            normal: {
                barBorderRadius: 10
            }
        }
    }]
};
```
![image](https://user-images.githubusercontent.com/448208/45596840-f0eca700-b9f4-11e8-8148-a6fc54d06950.png)

### 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/9085 ]
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