Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20750
**[Test build #88064 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88064/testReport)**
for PR 20750 at commit
[`dee5105`](https://github.com/apache/spark/commit/dee5105bbbd3377c1dd8ff17da1cc8694d7ed50c).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `trait SerializerSupport `
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