Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21571
**[Test build #91873 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/91873/testReport)**
for PR 21571 at commit
[`3b7b20d`](https://github.com/apache/spark/commit/3b7b20d5c1b662abd935c0a812d9e54f8ab01b24).
* This patch **fails Python style tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class GBTClassificationModel(TreeEnsembleModel,
JavaClassificationModel, JavaMLWritable,`
* `class PrefixSpan(JavaParams):`
* `public class MaskExpressionsUtils `
* `case class ArrayRemove(left: Expression, right: Expression)`
* `trait MaskLike `
* `trait MaskLikeWithN extends MaskLike `
* `case class Mask(child: Expression, upper: String, lower: String,
digit: String)`
* `case class MaskFirstN(`
* `case class MaskLastN(`
* `case class MaskShowFirstN(`
* `case class MaskShowLastN(`
* `case class MaskHash(child: Expression)`
* `abstract class FileFormatDataWriter(`
* `class EmptyDirectoryDataWriter(`
* `class SingleDirectoryDataWriter(`
* `class DynamicPartitionDataWriter(`
* `class WriteJobDescription(`
* `case class WriteTaskResult(commitMsg: TaskCommitMessage, summary:
ExecutedWriteSummary)`
* `case class ExecutedWriteSummary(`
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