Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20637
**[Test build #94878 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94878/testReport)**
for PR 20637 at commit
[`99731ca`](https://github.com/apache/spark/commit/99731ca058f0d8946397530aff76d3c55fa93162).
* This patch **fails due to an unknown error code, -9**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` case class Schema(dataType: DataType, nullable: Boolean)`
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