diff options
Diffstat (limited to 'sql/core/src/main/java/org/apache/spark/sql/expressions/java/typed.java')
-rw-r--r-- | sql/core/src/main/java/org/apache/spark/sql/expressions/java/typed.java | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/sql/core/src/main/java/org/apache/spark/sql/expressions/java/typed.java b/sql/core/src/main/java/org/apache/spark/sql/expressions/java/typed.java new file mode 100644 index 0000000000..c7c6e3868f --- /dev/null +++ b/sql/core/src/main/java/org/apache/spark/sql/expressions/java/typed.java @@ -0,0 +1,75 @@ +/* + * 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.java; + +import org.apache.spark.annotation.Experimental; +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.scala.typed}. + * + * @since 2.0.0 + */ +@Experimental +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(); + } +} |