wwwkom opened a new issue #9247: 如何让visualMap映射series.data之外的数据？ URL: https://github.com/apache/incubator-echarts/issues/9247 <!-- 为了方便我们能够复现和修复 bug，请遵从下面的规范描述您的问题。 --> ### One-line summary [问题简述] 现在的visualMap只能通过dimension指定映射来源，如果想在原有数据（假设有a/b/c/d四列）基础上额外添加一列新的数据作为映射来源，似乎只能重新解析原有数据，并将新的数据合并到原有数据后再重新作图，相当于所有元素都重新生成，效率较低。能否在原有图形的基础上，读取series.data之外的数据，只更新visualMap呢？
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