content: /*
   * 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.annotation.Experimental;
  import org.apache.spark.annotation.InterfaceStability;
  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;
  
  /**
   * :: Experimental ::
   * 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
   */
  @Experimental
  @InterfaceStability.Evolving
  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();
    }
  }
  