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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.
   */
  
  package com.aliyun.odps.mapred.bridge.type;
  
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  import com.aliyun.odps.Column;
  import com.aliyun.odps.OdpsType;
  import com.aliyun.odps.io.BooleanWritable;
  import com.aliyun.odps.io.DatetimeWritable;
  import com.aliyun.odps.io.DoubleWritable;
  import com.aliyun.odps.io.LongWritable;
  import com.aliyun.odps.io.Text;
  
  public class ColumnBasedRecordComparatorTest {
  
    @Test
    public void testEmptyColumnlist() {
      Column[] schema = new Column[]{new Column("col1", OdpsType.BIGINT),
                                     new Column("col2", OdpsType.BOOLEAN),
                                     new Column("col3", OdpsType.DOUBLE),
                                     new Column("col4", OdpsType.STRING),
                                     new Column("col5", OdpsType.DATETIME)};
  
      ColumnBasedRecordComparator comp = new ColumnBasedRecordComparator(new String[0], schema);
  
      assertTrue(comp.compare(new Object[]{null, null, null, null, null}, new Object[]{
          new LongWritable(0), new BooleanWritable(true), new DoubleWritable(0.0), new Text(""),
          new DatetimeWritable(0)}) == 0);
  
      assertTrue(comp.compare(new Object[]{new LongWritable(0), new BooleanWritable(true),
                                           new DoubleWritable(0.0), new Text(""),
                                           new DatetimeWritable(0)}, new Object[]{null,
                                                                                  null, null, null,
                                                                                  null}) == 0);
  
      assertTrue(comp.compare(new Object[]{null, null, null, null, null}, new Object[]{null,
                                                                                       null, null,
                                                                                       null, null})
                 == 0);
    }
  }
  