NingMengMeng opened a new issue #9946: echarts的框选问题（brush） URL: https://github.com/apache/incubator-echarts/issues/9946 ### Version 4.2.1-rc1 ### Steps to reproduce 1、点击框选按钮 2、框选 ### What is expected? 大数据的散点图，期望能够实现框选功能 ### What is actually happening? 你好，由于我的散点图要渲染几十万甚至上百万的数据，使用了appendData进行分片段展示，但是对于这种情况，一点击框选按钮(brush)就重新渲染，一去框选还是重新渲染。请问针对大数据量的散点图，如何实现框选功能呢 <!-- generated by echarts-issue-helper. DO NOT REMOVE -->
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