Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20470
**[Test build #86945 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/86945/testReport)**
for PR 20470 at commit
[`b962167`](https://github.com/apache/spark/commit/b96216730adb0f07e0e1b56c584af944f83e5c48).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` \"User class threw exception: \" +
StringUtils.stringifyException(cause))`
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