Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/23245
**[Test build #99803 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/99803/testReport)**
for PR 23245 at commit
[`2e9b09c`](https://github.com/apache/spark/commit/2e9b09cc24c5ae877ff3b0fb9a769d24c05462ac).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class ArrowCollectSerializer(Serializer):`
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