Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22009#discussion_r208684225 --- 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 -- @rdblue I have to fork a `PartitionReaderFactory` for continuous streaming, in order to use the name `createContinuousReader`. Also I need to rename `ContinuousReaderSupport.createReaderFactory ` to `createContinuousReaderFactory`, which requires to move out `createReaderFactory` from the base interace `ReadSupport`. Is it really worth? The existing sources only implement `XYZReadSupportProvider` at the same time, but not `XYZReadSupport`. e.g. micro-batch and continuous read support are always 2 different classes, as the logic is so different. I believe file source will be the same.
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