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[Bug] 当使用dataset时,markline会报错 #21415

@tlbb764652810

Description

@tlbb764652810

Version

6.0

Link to Minimal Reproduction

https://echarts.apache.org/examples/zh/editor.html?c=line-simple&code=XZKxbsIwEIZ3nuK2LBGKQ0ISqg4tW0XVpVIHxOCaE0QQGzkOBVXMfYo-Rad26dOgvkZtJwbDDZZ99_nu953FRpWCwy289wDmVNEa1cgeAGrRSIYjmNoTwDSomZAYhBDQSjRcmd1GinnDVDALHZUX_UEIaR6TWMcfqWJLChOqFHpQmvVJCFkep4mByvUKnpF6QJb0dSQh0cBkGS8Ra4SxYMKH0shkIXGWpmfoXoo3XvrFtKIshDgiicE6Rde5hrlVVJBkqKFLMaToa2dB8tSIeZKULxAempL5VUhkIBJ11AQr3dhraBB3UmxzXuiaN-qs2FJmPZgLu7tdWethgNpv9BgCRhUuhNwHbXjfhe2lDtnSdYOBS1CjLFEj7QBb8IS-Uhk4WciZmGunQ3RtTbjROkqX1N5u9J3P1jFWUbmalPwiiflP5-_ja2iN08ooOX5_HT8__n5-vUqeULpFSRf2Vc4Op33bMucx66x3uPkH&enc=deflate

Steps to Reproduce

好用的例子如下

option = {
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      data: [150, 230, 224, 218, 135, 147, 260],
      type: 'bar',
      markLine: {
        data: [{
            name: '平均线',
            // 支持 'average', 'min', 'max'
            type: 'average'
        }]
      }
    }
  ]
};

不好用的例子如下

option = {
  dataset: {
    source: [
      ['score', 'amount', 'product'],
      [89.3, 58212, 'Matcha Latte'],
      [57.1, 78254, 'Milk Tea'],
      [74.4, 41032, 'Cheese Cocoa'],
      [50.1, 12755, 'Cheese Brownie'],
      [89.7, 20145, 'Matcha Cocoa'],
      [68.1, 79146, 'Tea'],
      [19.6, 91852, 'Orange Juice'],
      [10.6, 101852, 'Lemon Juice'],
      [32.7, 20112, 'Walnut Brownie']
    ]
  },
  xAxis: {type: 'category'},
  yAxis: {
    type: 'value'
  },
  series: [
    {
      type: 'bar',
      encode: {
        x: 'product',
        y: 'amount'
      },
      markLine: {
        data: [{
            name: '平均线',
            type: 'average'
        }]
      }
    }
  ]
};

Current Behavior

不好用的例子加载报错

Expected Behavior

Image

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

之前v5的版本是好用的

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