cloud-fan commented on a change in pull request #23383: [SPARK-23817][SQL] Migrate ORC file format read path to data source V2 URL: https://github.com/apache/spark/pull/23383#discussion_r247007397
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/EmptyPartitionReader.scala ########## @@ -0,0 +1,34 @@ +/* + * 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.datasources.v2 + +import java.io.IOException + +import org.apache.spark.sql.sources.v2.reader.PartitionReader + +/** + * A [[PartitionReader]] with empty output. + */ +class EmptyPartitionReader[T] extends PartitionReader[T] { + override def next(): Boolean = false + + override def get(): T = + throw new IOException("No records should be returned from EmptyDataReader") + + override def close(): Unit = {} +} Review comment: how about we change the PR title to `create file format v2 migration infra and migrate ORC`? If we only commit specific code to migrate orc, it's useless and will be refactored right away when we migrate the next file format. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
