Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21851
**[Test build #93469 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/93469/testReport)**
for PR 21851 at commit
[`b499b97`](https://github.com/apache/spark/commit/b499b9727a4cb9cc42149d05a4d54dba2de8bd9e).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class KnowNotNull(child: Expression) extends UnaryExpression `
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