Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/20906#discussion_r177243246
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousWriteExec.scala
---
@@ -0,0 +1,122 @@
+/*
+ * 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 scala.util.control.NonFatal
+
+import org.apache.spark.{SparkEnv, SparkException, TaskContext}
+import org.apache.spark.internal.Logging
+import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.Attribute
+import org.apache.spark.sql.execution.SparkPlan
+import
org.apache.spark.sql.execution.datasources.v2.{DataWritingSparkTask,
InternalRowDataWriterFactory}
+import
org.apache.spark.sql.execution.datasources.v2.DataWritingSparkTask.{logError,
logInfo}
+import org.apache.spark.sql.execution.streaming.StreamExecution
+import org.apache.spark.sql.sources.v2.writer._
+import org.apache.spark.sql.sources.v2.writer.streaming.StreamWriter
+import org.apache.spark.util.Utils
+
+case class ContinuousWriteExec(writer: StreamWriter, query: SparkPlan)
--- End diff --
add docs
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