Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/20243#discussion_r161967927
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/sources/PackedRowWriterFactory.scala
---
@@ -0,0 +1,50 @@
+/*
+ * 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.sources
+
+import scala.collection.mutable
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.Row
+import org.apache.spark.sql.sources.v2.writer.{DataWriter,
DataWriterFactory, WriterCommitMessage}
+
+/**
+ * A simple [[DataWriterFactory]] whose tasks just pack rows into the
commit message for delivery
+ * to a [[org.apache.spark.sql.sources.v2.writer.DataSourceV2Writer]] on
the driver.
+ */
+case object PackedRowWriterFactory extends DataWriterFactory[Row] {
+ def createDataWriter(partitionId: Int, attemptNumber: Int):
DataWriter[Row] = {
+ new PackedRowDataWriter()
+ }
+}
+
+case class PackedRowCommitMessage(rows: Array[Row]) extends
WriterCommitMessage
+
+class PackedRowDataWriter() extends DataWriter[Row] with Logging {
--- End diff --
add docs.
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