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在缓存数据集中，除了添加自定义的Sql表达式字段、计算字段和分类字段之外，还支持使用分析表达式添加度量值和计算列。
这样的话，就大大扩展了数据集的数据构造能力，用户可以根据分析场景灵活的编写和计算自己想要的更多指标。有关表达式的更多介绍详见第八章 分析表达式。
单击字段右侧的更多按钮，根据需要选择添加度量值或添加计算列。关于度量值和计算列的介绍，请参见度量值和计算列。
进入分析表达式窗口后，具体操作与在仪表板中一致。请您参考第八章 分析表达式。
以下是两个简单的示例，分别为添加度量值和添加计算列。
添加完成后，新的字段即显示在数据集中。您可以单击指标右侧的编辑按钮或删除按钮对其进行编辑或删除操作，也可以基于新字段继续添加表达式字段。
预览数据集时，度量值和计算列均不可见，只能在仪表板中使用这些新字段。
并且新指标在仪表板设计器中为只读状态，不可以进一步编辑或修改。
type=info
在创建计算列和度量值时，不支持使用数据集中的参数。
创建的计算列和度量值均不可在在数据集过滤器中使用。