Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20786
**[Test build #88868 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88868/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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