Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/22749
**[Test build #97459 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/97459/testReport)**
for PR 22749 at commit
[`d755e84`](https://github.com/apache/spark/commit/d755e8406f06117ccc96b8f19debab6b2a736e10).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` throw new RuntimeException(s\"class $clsName has unexpected
serializer: $objSerializer\")`
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