BsoBird commented on code in PR #5891: URL: https://github.com/apache/hive/pull/5891#discussion_r2164438543
########## ql/src/java/org/apache/hadoop/hive/ql/udf/UDFUUIDV7.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.hadoop.hive.ql.udf; + +import org.apache.hadoop.hive.ql.exec.Description; +import org.apache.hadoop.hive.ql.exec.UDF; +import org.apache.hadoop.io.Text; + +import java.util.UUID; +import java.util.concurrent.ThreadLocalRandom; + +/** + * UDFUUIDV7. + * + */ +@Description(name = "uuid_v7", + value = "_FUNC_() - Returns a universally unique identifier (UUID_V7) string.", + extended = """ + The value is returned as a canonical UUID 36-character string. + Example: + > SELECT _FUNC_(); + '0baf1f52-53df-487f-8292-99a03716b688' + > SELECT _FUNC_(); + '36718a53-84f5-45d6-8796-4f79983ad49d'""") +@UDFType(deterministic = false) +public class UDFUUIDV7 extends UDF { + private final Text result = new Text(); + /** + * Returns a universally unique identifier (UUID_V7) string (36 characters). + * + * @return Text + */ + public Text evaluate() { + result.set(randomUUIDV7().toString()); + return result; + } + + + private UUID randomUUIDV7() { Review Comment: @deniskuzZ I reviewed the code and conducted some simple tests. Currently, I have selected a UUIDv7 generation algorithm with relatively the best performance (approximately generating 10.8 million UUIDs per second in a single thread). Of course, if we need to switch to a different implementation library, I have no objections. What do you think? After all, the UUIDv7 algorithm isn't very complex, so perhaps there's no need to introduce a complicated library?After all, the performance of using SecureRandom + ByteBuffer to generate UUIDV7 is quite poor. -- 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: gitbox-unsubscr...@hive.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
