Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19609
**[Test build #3965 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/NewSparkPullRequestBuilder/3965/testReport)**
for PR 19609 at commit
[`f08733e`](https://github.com/apache/spark/commit/f08733ed844e5f177d8206c76d86aa21387934bf).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class CrossValidator(Estimator, ValidatorParams, HasParallelism,
MLReadable, MLWritable):`
* `class TrainValidationSplit(Estimator, ValidatorParams, HasParallelism,
MLReadable, MLWritable):`
* `class ArrowWriter(val root: VectorSchemaRoot, fields:
Array[ArrowFieldWriter]) `
* `case class ClearCacheCommand() extends RunnableCommand `
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