| /* |
| * 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.carbondata.examples |
| |
| import org.apache.hadoop.conf.Configuration |
| |
| import org.apache.carbondata.examples.util.ExampleUtils |
| import org.apache.carbondata.hadoop.{CarbonInputFormat, CarbonProjection} |
| |
| // scalastyle:off println |
| object HadoopFileExample { |
| |
| def main(args: Array[String]): Unit = { |
| val cc = ExampleUtils.createCarbonContext("HadoopFileExample") |
| ExampleUtils.writeSampleCarbonFile(cc, "carbon1") |
| |
| // read two columns |
| val projection = new CarbonProjection |
| projection.addColumn("c1") // column c1 |
| projection.addColumn("c3") // column c3 |
| val conf = new Configuration() |
| CarbonInputFormat.setColumnProjection(conf, projection) |
| |
| val sc = cc.sparkContext |
| val input = sc.newAPIHadoopFile(s"${cc.storePath}/default/carbon1", |
| classOf[CarbonInputFormat[Array[Object]]], |
| classOf[Void], |
| classOf[Array[Object]], |
| conf) |
| val result = input.map(x => x._2.toList).collect |
| result.foreach(x => println(x.mkString(", "))) |
| |
| // delete carbondata file |
| ExampleUtils.cleanSampleCarbonFile(cc, "carbon1") |
| } |
| } |
| // scalastyle:on println |
| |
