Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/21200#discussion_r185365888
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/DataReaderThread.scala
---
@@ -0,0 +1,72 @@
+/*
+ * 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.concurrent.BlockingQueue
+import java.util.concurrent.atomic.AtomicBoolean
+
+import org.apache.spark.TaskContext
+import org.apache.spark.sql.catalyst.expressions.UnsafeRow
+import org.apache.spark.sql.sources.v2.reader.DataReader
+import org.apache.spark.sql.sources.v2.reader.streaming.PartitionOffset
+
+/**
+ * The data component of [[ContinuousQueuedDataReader]]. Pushes (row,
offset) to the queue when
+ * a new row arrives to the [[DataReader]].
+ */
+class DataReaderThread(
--- End diff --
Rename to ContinuousDataReaderThread.
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