Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21034
**[Test build #89183 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89183/testReport)**
for PR 21034 at commit
[`3a76d87`](https://github.com/apache/spark/commit/3a76d87492a8d03a29aeee877f5564071b0a68a8).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Reverse(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes `
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