Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21529
**[Test build #91790 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/91790/testReport)**
for PR 21529 at commit
[`6553c27`](https://github.com/apache/spark/commit/6553c27bc23efbaed268556b0cb19405fa693de9).
* This patch **fails Spark unit tests**.
* This patch **does not merge cleanly**.
* This patch adds no public classes.
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