Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/21560#discussion_r196584760
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousCoalesceExec.scala
---
@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.streaming.continuous
+
+import java.util.UUID
+
+import org.apache.spark.{HashPartitioner, SparkEnv}
+import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.{Attribute, UnsafeRow}
+import org.apache.spark.sql.catalyst.plans.physical.{Partitioning,
SinglePartition}
+import org.apache.spark.sql.execution.SparkPlan
+import
org.apache.spark.sql.execution.streaming.continuous.shuffle.{ContinuousShuffleReadPartition,
ContinuousShuffleReadRDD}
+
+/**
+ * Physical plan for coalescing a continuous processing plan.
+ *
+ * Currently, only coalesces to a single partition are supported.
`numPartitions` must be 1.
+ */
+case class ContinuousCoalesceExec(numPartitions: Int, child: SparkPlan)
extends SparkPlan {
+ override def output: Seq[Attribute] = child.output
+
+ override def children: Seq[SparkPlan] = child :: Nil
+
+ override def outputPartitioning: Partitioning = SinglePartition
+
+ override def doExecute(): RDD[InternalRow] = {
+ assert(numPartitions == 1)
+
+ val childRdd = child.execute()
+ val endpointName = s"RPCContinuousShuffleReader-${UUID.randomUUID()}"
+ val reader = new ContinuousShuffleReadRDD(
--- End diff --
super nit: rename to readerRDD to avoid confusion with other v2 reader
classes.
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