Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20938
**[Test build #89503 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89503/testReport)**
for PR 20938 at commit
[`57f554b`](https://github.com/apache/spark/commit/57f554bf6e16c98cd5595be8b9c63721bd889322).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class Summarizer(object):`
* `class SummaryBuilder(JavaWrapper):`
* `case class Reverse(child: Expression) extends UnaryExpression with
ImplicitCastInputTypes `
* `class ArrayDataIndexedSeq[T](arrayData: ArrayData, dataType: DataType)
extends IndexedSeq[T] `
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