Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20938
**[Test build #88758 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88758/testReport)**
for PR 20938 at commit
[`755d6db`](https://github.com/apache/spark/commit/755d6db0cbec1b822e019c425aca258eb7b512a1).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Flatten(child: Expression) extends UnaryExpression `
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