Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19717
**[Test build #84120 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/84120/testReport)**
for PR 19717 at commit
[`f38144b`](https://github.com/apache/spark/commit/f38144bcd11a2a261c857d09dc220d11da5ead5f).
* This patch **fails to build**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` require(mainClass.isDefined, \"Main class must be specified via
--main-class\")`
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