Github user SparkQA commented on the issue: https://github.com/apache/spark/pull/20786 **[Test build #88891 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88891/testReport)** for PR 20786 at commit [`48c17d4`](https://github.com/apache/spark/commit/48c17d4dff6a4e82b86d70f3845e6d524b4807e5). * This patch **fails Spark unit tests**. * This patch merges cleanly. * This patch adds the following public classes _(experimental)_: * `sealed trait ClassificationNode extends Node ` * `sealed trait RegressionNode extends Node ` * `sealed trait LeafNode extends Node ` * `sealed trait InternalNode extends Node `
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