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   * 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.
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  package com.aliyun.odps.mapred.local.bugfix;
  
  import java.io.IOException;
  import java.util.Iterator;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import com.aliyun.odps.OdpsException;
  import com.aliyun.odps.data.Record;
  import com.aliyun.odps.data.TableInfo;
  import com.aliyun.odps.mapred.JobClient;
  import com.aliyun.odps.mapred.MapperBase;
  import com.aliyun.odps.mapred.ReducerBase;
  import com.aliyun.odps.mapred.RunningJob;
  import com.aliyun.odps.mapred.conf.JobConf;
  import com.aliyun.odps.mapred.local.utils.TestUtils;
  import com.aliyun.odps.mapred.utils.InputUtils;
  import com.aliyun.odps.mapred.utils.OutputUtils;
  import com.aliyun.odps.mapred.utils.SchemaUtils;
  
  public class SetOutputGroupingColumns {
  
    @Before
    public void setUp() throws Exception {
      TestUtils.setEnvironment(TestUtils.bug);
    }
  
    public static class MyMapper extends MapperBase {
  
      Record key;
      Record val;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        key = context.createMapOutputKeyRecord();
        val = context.createMapOutputValueRecord();
      }
  
      @Override
      public void map(long recordNum, Record record, TaskContext context) throws IOException {
        key.setBigint(0, record.getBigint(0));
        key.setBigint(1, record.getBigint(1));
        val.setBigint(0, record.getBigint(2));
        context.write(key, val);
      }
  
    }
  
    public static class MyCombiner extends ReducerBase {
  
      Record myKey;
      Record val;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        myKey = context.createMapOutputKeyRecord();
        val = context.createMapOutputValueRecord();
      }
  
      @Override
      public void reduce(Record key, Iterator<Record> values, TaskContext context)
          throws IOException {
        while (values.hasNext()) {
          myKey.setBigint(0, key.getBigint(0));
          myKey.setBigint(1, key.getBigint(1));
          Record r = values.next();
          val.setBigint(0, r.getBigint(0));
          System.out.println(key.getBigint(0) + "\t" + key.getBigint(1) + "\t" + val.getBigint(0));
          context.write(myKey, val);
        }
      }
  
    }
  
    public static class MyReducer extends ReducerBase {
  
      Record result;
  
      @Override
      public void setup(TaskContext context) throws IOException {
        result = context.createOutputRecord();
      }
  
      @Override
      public void reduce(Record key, Iterator<Record> values, TaskContext context)
          throws IOException {
        while (values.hasNext()) {
          result.setBigint(0, key.getBigint(0));
          result.setBigint(1, key.getBigint(1));
          Record val = values.next();
          result.setBigint(2, val.getBigint(0));
          context.write(result);
        }
      }
  
    }
  
    @Test
    public void test() throws OdpsException {
      JobConf job = new JobConf();
  
      job.setMapperClass(MyMapper.class);
      job.setReducerClass(MyReducer.class);
      job.setCombinerClass(MyCombiner.class);
  
      job.setMapOutputKeySchema(SchemaUtils.fromString("c1:bigint,c2:bigint"));
      job.setMapOutputValueSchema(SchemaUtils.fromString("c3:bigint"));
  
      job.setOutputGroupingColumns(new String[]{"c1"});
      job.setOutputKeySortColumns(new String[]{"c2"});
      job.setOutputKeySortOrder(new com.aliyun.odps.mapred.conf.JobConf.SortOrder[]{
          com.aliyun.odps.mapred.conf.JobConf.SortOrder.DESC});
  
      InputUtils.addTable(TableInfo.builder().tableName("iii").build(), job);
      OutputUtils
          .addTable(TableInfo.builder().tableName("setOutputGroupingColumns_out").build(), job);
  
      RunningJob rj = JobClient.runJob(job);
      rj.waitForCompletion();
    }
  }
  