Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21745
**[Test build #92917 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/92917/testReport)**
for PR 21745 at commit
[`eff3af2`](https://github.com/apache/spark/commit/eff3af29c1f66458d2a2ba0bb3037f726f56dbe2).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `public class JavaSummarizerExample `
* `trait ComplexTypeMergingExpression extends Expression `
* `case class Size(child: Expression) extends UnaryExpression with
ExpectsInputTypes `
* `case class MapConcat(children: Seq[Expression]) extends Expression `
* ` case class StreamingGlobalLimitStrategy(outputMode: OutputMode)
extends Strategy `
* `case class StreamingGlobalLimitExec(`
* `sealed trait MultipleWatermarkPolicy `
* `case class WatermarkTracker(policy: MultipleWatermarkPolicy) extends
Logging `
* `trait MemorySinkBase extends BaseStreamingSink `
* `class MemorySink(val schema: StructType, outputMode: OutputMode)
extends Sink`
* `class MemoryWriter(sink: MemorySinkV2, batchId: Long, outputMode:
OutputMode)`
* `class MemoryStreamWriter(val sink: MemorySinkV2, outputMode:
OutputMode)`
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