Github user SparkQA commented on the issue: https://github.com/apache/spark/pull/21851 **[Test build #93503 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/93503/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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