spark typed 源码
spark typed 代码
文件路径：/sql/core/src/main/java/org/apache/spark/sql/expressions/javalang/typed.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.expressions.javalang;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.sql.TypedColumn;
import org.apache.spark.sql.execution.aggregate.TypedAverage;
import org.apache.spark.sql.execution.aggregate.TypedCount;
import org.apache.spark.sql.execution.aggregate.TypedSumDouble;
import org.apache.spark.sql.execution.aggregate.TypedSumLong;
/**
* Type-safe functions available for {@link org.apache.spark.sql.Dataset} operations in Java.
*
* Scala users should use {@link org.apache.spark.sql.expressions.scalalang.typed}.
*
* @since 2.0.0
* @deprecated As of release 3.0.0, please use the untyped builtin aggregate functions.
*/
@Deprecated
public class typed {
// Note: make sure to keep in sync with typed.scala
/**
* Average aggregate function.
*
* @since 2.0.0
*/
public static <T> TypedColumn<T, Double> avg(MapFunction<T, Double> f) {
return new TypedAverage<T>(f).toColumnJava();
}
/**
* Count aggregate function.
*
* @since 2.0.0
*/
public static <T> TypedColumn<T, Long> count(MapFunction<T, Object> f) {
return new TypedCount<T>(f).toColumnJava();
}
/**
* Sum aggregate function for floating point (double) type.
*
* @since 2.0.0
*/
public static <T> TypedColumn<T, Double> sum(MapFunction<T, Double> f) {
return new TypedSumDouble<T>(f).toColumnJava();
}
/**
* Sum aggregate function for integral (long, i.e. 64 bit integer) type.
*
* @since 2.0.0
*/
public static <T> TypedColumn<T, Long> sumLong(MapFunction<T, Long> f) {
return new TypedSumLong<T>(f).toColumnJava();
}
}
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