spark SQLUserDefinedType 源码
spark SQLUserDefinedType 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/types/SQLUserDefinedType.java
/*
* 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.types;
import java.lang.annotation.*;
import org.apache.spark.annotation.DeveloperApi;
/**
* ::DeveloperApi::
* A user-defined type which can be automatically recognized by a SQLContext and registered.
* WARNING: UDTs are currently only supported from Scala.
*/
// TODO: Should I used @Documented ?
@DeveloperApi
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface SQLUserDefinedType {
/**
* Returns an instance of the UserDefinedType which can serialize and deserialize the user
* class to and from Catalyst built-in types.
*/
Class<? extends UserDefinedType<?>> udt();
}
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