Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20856
**[Test build #4171 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/NewSparkPullRequestBuilder/4171/testReport)**
for PR 20856 at commit
[`3981421`](https://github.com/apache/spark/commit/39814216026da32eee5aabf3886bbedd3b90ed08).
* This patch **fails Spark unit tests**.
* This patch **does not merge cleanly**.
* This patch adds no public classes.
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