Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20858
**[Test build #88596 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88596/testReport)**
for PR 20858 at commit
[`bb46c3d`](https://github.com/apache/spark/commit/bb46c3d3d3e18a9e05ddb6fe6efda3c25c2711a4).
* This patch **fails Scala style tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class UnresolvedConcat(children: Seq[Expression]) extends
Expression`
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