spark FlatMapGroupsWithStateFunction 源码
spark FlatMapGroupsWithStateFunction 代码
文件路径：/sql/core/src/main/java/org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.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;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.annotation.Experimental;
import org.apache.spark.sql.streaming.GroupState;
/**
* ::Experimental::
* Base interface for a map function used in
* {@code org.apache.spark.sql.KeyValueGroupedDataset.flatMapGroupsWithState(
* FlatMapGroupsWithStateFunction, org.apache.spark.sql.streaming.OutputMode,
* org.apache.spark.sql.Encoder, org.apache.spark.sql.Encoder)}
* @since 2.1.1
*/
@Experimental
@Evolving
public interface FlatMapGroupsWithStateFunction<K, V, S, R> extends Serializable {
Iterator<R> call(K key, Iterator<V> values, GroupState<S> state) throws Exception;
}
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