| /* |
| * 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.calcite.adapter.spark; |
| |
| import org.apache.calcite.DataContext; |
| import org.apache.calcite.linq4j.Enumerable; |
| import org.apache.calcite.linq4j.Linq4j; |
| |
| import org.apache.spark.api.java.JavaRDD; |
| import org.apache.spark.api.java.JavaSparkContext; |
| import org.apache.spark.api.java.function.FlatMapFunction; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| |
| /** |
| * Runtime utilities for Calcite's Spark adapter. Generated code calls these |
| * methods. |
| */ |
| public abstract class SparkRuntime { |
| private SparkRuntime() {} |
| |
| /** Converts an array into an RDD. */ |
| public static <T> JavaRDD<T> createRdd(JavaSparkContext sc, T[] ts) { |
| final List<T> list = Arrays.asList(ts); |
| return sc.parallelize(list); |
| } |
| |
| /** Converts an enumerable into an RDD. */ |
| public static <T> JavaRDD<T> createRdd(JavaSparkContext sc, |
| Enumerable<T> enumerable) { |
| final List<T> list = enumerable.toList(); |
| return sc.parallelize(list); |
| } |
| |
| /** Converts an RDD into an enumerable. */ |
| public static <T> Enumerable<T> asEnumerable(JavaRDD<T> rdd) { |
| return Linq4j.asEnumerable(rdd.collect()); |
| } |
| |
| /** Returns the Spark context for the current execution. |
| * |
| * <p>Currently a global variable; maybe later held within {@code root}.</p> |
| */ |
| public static JavaSparkContext getSparkContext(DataContext root) { |
| return (JavaSparkContext) SparkHandlerImpl.instance().sparkContext(); |
| } |
| |
| /** Combines linq4j {@link org.apache.calcite.linq4j.function.Function} |
| * and Spark {@link org.apache.spark.api.java.function.FlatMapFunction}. */ |
| public abstract static class CalciteFlatMapFunction<T, R> |
| implements FlatMapFunction<T, R>, |
| org.apache.calcite.linq4j.function.Function { |
| } |
| } |
| |
| // End SparkRuntime.java |