Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19977
**[Test build #85250 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/85250/testReport)**
for PR 19977 at commit
[`e10b77e`](https://github.com/apache/spark/commit/e10b77eef59733ba1089201f51f3bc4209e00da1).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` case class ConcatCoercion(conf: SQLConf) extends TypeCoercionRule `
* `case class Concat(children: Seq[Expression]) extends Expression `
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