danny0405 commented on a change in pull request #4880: URL: https://github.com/apache/hudi/pull/4880#discussion_r817297153
########## File path: hudi-common/src/main/java/org/apache/hudi/common/model/DeleteKey.java ########## @@ -0,0 +1,87 @@ +/* + * 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.hudi.common.model; + +import java.util.Objects; + +/** + * Delete key is a combination of HoodieKey and ordering value. + * The key is used for {@link org.apache.hudi.common.table.log.block.HoodieDeleteBlock} + * to support per-record deletions. The deletion block is always appended after the data block, + * we need to keep the ordering val to combine with the data records when merging, or the data may + * be dropped if there are intermediate deletions for the inputs + * (a new INSERT comes after a DELETE in one input batch). + */ +public class DeleteKey extends HoodieKey { + private static final long serialVersionUID = 1L; + + /** + * For purposes of preCombining. + */ + private Comparable orderingVal; + + private DeleteKey(String recordKey, String partitionPath, Comparable orderingVal) { + super(recordKey, partitionPath); + this.orderingVal = orderingVal; + } + + public static DeleteKey create(HoodieKey hoodieKey, Comparable orderingVal) { + return create(hoodieKey.getRecordKey(), hoodieKey.getPartitionPath(), orderingVal); + } + + public static DeleteKey create(String recordKey, String partitionPath) { + return create(recordKey, partitionPath, 0); Review comment: From my understanding, we use `0` before to represent the natural order just because all the records have same version number, so the later records version is always chosen. Maybe a string flag here is more readable, we can address that in another PR though ~ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
