Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22009#discussion_r208685140
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/streaming/ContinuousPartitionReaderFactory.java
---
@@ -0,0 +1,71 @@
+/*
+ * 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.sources.v2.reader.streaming;
+
+import java.io.Serializable;
+
+import org.apache.spark.annotation.InterfaceStability;
+import org.apache.spark.sql.catalyst.InternalRow;
+import org.apache.spark.sql.sources.v2.reader.InputPartition;
+import org.apache.spark.sql.vectorized.ColumnarBatch;
+
+/**
+ * A factory used to create {@link ContinuousPartitionReader} instances.
+ */
+@InterfaceStability.Evolving
+public interface ContinuousPartitionReaderFactory extends Serializable {
--- End diff --
That said, the data source implementations probably do not care if they can
implement different read support at the same time, but we need to pay a high
cost for this change.
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