spark CoGroupFunction 源码
spark CoGroupFunction 代码
文件路径：/core/src/main/java/org/apache/spark/api/java/function/CoGroupFunction.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.api.java.function;
import java.io.Serializable;
import java.util.Iterator;
/**
* A function that returns zero or more output records from each grouping key and its values from 2
* Datasets.
*/
@FunctionalInterface
public interface CoGroupFunction<K, V1, V2, R> extends Serializable {
Iterator<R> call(K key, Iterator<V1> left, Iterator<V2> right) throws Exception;
}
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