Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20858
**[Test build #89001 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89001/testReport)**
for PR 20858 at commit
[`090929f`](https://github.com/apache/spark/commit/090929f5e35e1f8aec3e83484cc8227a0436e5d7).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Concat(children: Seq[Expression]) extends Expression `
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