Github user SparkQA commented on the issue: https://github.com/apache/spark/pull/21439 **[Test build #92981 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/92981/testReport)** for PR 21439 at commit [`82d4fd5`](https://github.com/apache/spark/commit/82d4fd5dfa20b953ec71e2949b7578218ee0b260). * This patch **fails to build**. * This patch merges cleanly. * This patch adds the following public classes _(experimental)_: * `public class JavaSummarizerExample ` * ` class SerializableConfiguration(@transient var value: Configuration)` * ` class IncompatibleSchemaException(msg: String, ex: Throwable = null) extends Exception(msg, ex)` * ` case class SchemaType(dataType: DataType, nullable: Boolean)` * ` implicit class AvroDataFrameWriter[T](writer: DataFrameWriter[T]) ` * ` implicit class AvroDataFrameReader(reader: DataFrameReader) ` * `trait ComplexTypeMergingExpression extends Expression ` * `case class Size(child: Expression) extends UnaryExpression with ExpectsInputTypes ` * `case class MapConcat(children: Seq[Expression]) extends Expression ` * `abstract class ArraySetLike extends BinaryArrayExpressionWithImplicitCast ` * `case class ArrayUnion(left: Expression, right: Expression) extends ArraySetLike ` * ` 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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