[GitHub] [incubator-echarts] quick-sort opened a new issue #10248: 使用dataset数据时，series.label.formatter使用function(params){}，params.value的值为dataset中所有列，而不是该series对应的那一列的数据

[GitBox <gi...@apache.org>]

quick-sort opened a new issue #10248: 使用dataset数据时，series.label.formatter使用function(params){}，params.value的值为dataset中所有列，而不是该series对应的那一列的数据
URL: https://github.com/apache/incubator-echarts/issues/10248
 
 
   ### Version
   4.2.1
   
   ### Steps to reproduce
   https://echarts.baidu.com/examples/editor.html?c=dataset-simple1
   
   option = {
       legend: {},
       tooltip: {},
       dataset: {
           dimensions: ['product', '2015', '2016', '2017'],
           source: [
               {product: 'Matcha Latte', '2015': 43.3, '2016': 85.8, '2017': 93.7},
               {product: 'Milk Tea', '2015': 83.1, '2016': 73.4, '2017': 55.1},
               {product: 'Cheese Cocoa', '2015': 86.4, '2016': 65.2, '2017': 82.5},
               {product: 'Walnut Brownie', '2015': 72.4, '2016': 53.9, '2017': 39.1}
           ]
       },
       xAxis: {type: 'category'},
       yAxis: {},
       // Declare several bar series, each will be mapped
       // to a column of dataset.source by default.
       series: [
           {type: 'bar',
           encode: {x: 'product', y:'2015'},
               label: {
                   show: true,
                   formatter: a => JSON.stringify(a.value)
               }
           }
       ]
   };
   
   猜测问题出在https://github.com/apache/incubator-echarts/blob/master/src/chart/bar/helper.js#L29
   参数中缺一个dimIndex的参数，其它图表类型下也存在类似问题，不仅仅是bar
   最终参数传递到
   https://github.com/apache/incubator-echarts/blob/master/src/model/mixin/dataFormat.js#L87
   
   建议参考
   https://github.com/apache/incubator-echarts/blob/master/src/chart/helper/labelHelper.js#L33
   可获取该series对应的列的值
   
   ### What is expected?
   series.label.formatter = function(params){}
   params.value应该是该series对应的列的值
   
   ### What is actually happening?
   params.value获得的是所有列的值的数组
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   

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