Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19977
**[Test build #84963 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/84963/testReport)**
for PR 19977 at commit
[`ffb6e1c`](https://github.com/apache/spark/commit/ffb6e1c06bb1a7026717abb3e2008230df56c1b6).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` class ConcatCoercion(conf: SQLConf) extends TypeCoercionRule `
* `case class Concat(children: Seq[Expression], isBinaryMode: Boolean =
false)`
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