Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21857
**[Test build #93587 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/93587/testReport)**
for PR 21857 at commit
[`c49b15c`](https://github.com/apache/spark/commit/c49b15c8816b0c8ff56ccd120ddea9ce24e5c8da).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Except(`
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