Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19599
**[Test build #84698 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/84698/testReport)**
for PR 19599 at commit
[`3f6e472`](https://github.com/apache/spark/commit/3f6e472ebff8327e20dcdb0041f525a3856244b0).
* This patch **fails MiMa tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class StringParam(parent: Params, name: String, doc: String, isValid:
String => Boolean)`
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