org.apache.hadoop.hive.ql.udf.UDFUUID Maven / Gradle / Ivy
/**
* 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 java.util.UUID;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;
/**
* UDFUUID.
*
*/
@Description(name = "uuid",
value = "_FUNC_() - Returns a universally unique identifier (UUID) string.",
extended = "The value is returned as a canonical UUID 36-character string.\n"
+ "Example:\n"
+ " > SELECT _FUNC_();\n"
+ " '0baf1f52-53df-487f-8292-99a03716b688'\n"
+ " > SELECT _FUNC_();\n"
+ " '36718a53-84f5-45d6-8796-4f79983ad49d'")
@UDFType(deterministic = false)
public class UDFUUID extends UDF {
private final Text result = new Text();
/**
* Returns a universally unique identifier (UUID) string (36 characters).
*
* @return Text
*/
public Text evaluate() {
result.set(UUID.randomUUID().toString());
return result;
}
}