Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/22049
**[Test build #94470 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94470/testReport)**
for PR 22049 at commit
[`629d18a`](https://github.com/apache/spark/commit/629d18a1fb1656e7c8fca23827858d9883217d17).
* This patch **fails due to an unknown error code, -9**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class KnownNotNull(child: Expression) extends UnaryExpression `
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