Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21028
**[Test build #89639 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89639/testReport)**
for PR 21028 at commit
[`c895707`](https://github.com/apache/spark/commit/c8957071056ff064a4fc8db36f26c780b4472bee).
* This patch passes all 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 `
* `case class ArrayPosition(left: Expression, right: Expression)`
* `case class ElementAt(left: Expression, right: Expression) extends
GetMapValueUtil `
* `case class Concat(children: Seq[Expression]) extends Expression `
* `abstract class GetMapValueUtil extends BinaryExpression with
ImplicitCastInputTypes `
* `case class GetMapValue(child: Expression, key: Expression)`
* `class ArrayDataIndexedSeq[T](arrayData: ArrayData, dataType: DataType)
extends IndexedSeq[T] `
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