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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