关于dataset指定维度后如何使用seriesLayoutBy:'row‘echarts 柱状配置项内容和展示

      var option = {
    legend: {
    },
    tooltip: {
    },
    dataset: {
        sourceHeader:false,
        dimensions: [
            {name: 'score', type: 'number'},
            {name: 'amount', type: 'number'},
            {name: 'product',type: 'ordinal'}
            ],
        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: {},
    series: [
        {
            type: 'bar',
            // seriesLayoutBy:'row',
            encode: {
                y: 'amount',
                x: 'product',
                seriesName: 'amount'
            }
        },
        {
            type: 'bar',
            // seriesLayoutBy:'row',
            encode: {
                y: 'score',
                x: 'product',
                seriesName: 'score'
            }
        }
    ]
};
//请问指定维度后怎么使用seriesLayoutBy属性