UnionStructObjectInspectorTest.java

/**
 * 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 co.cask.cdap.hive.objectinspector;

import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.junit.Assert;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * TestUnionStructObjectInspector.
 *
 */
public class UnionStructObjectInspectorTest {

  @Test
  public void testUnionStructObjectInspector() throws Throwable {
    try {
      ArrayList<String> fieldNames1 = new ArrayList<>();
      fieldNames1.add("firstInteger");
      fieldNames1.add("secondString");
      fieldNames1.add("thirdBoolean");
      ArrayList<ObjectInspector> fieldObjectInspectors1 = new ArrayList<>();
      fieldObjectInspectors1
          .add(PrimitiveObjectInspectorFactory.javaIntObjectInspector);
      fieldObjectInspectors1
          .add(PrimitiveObjectInspectorFactory.javaStringObjectInspector);
      fieldObjectInspectors1
          .add(PrimitiveObjectInspectorFactory.javaBooleanObjectInspector);
      StandardStructObjectInspector soi1 =
          ObjectInspectorFactory.getStandardStructObjectInspector(fieldNames1, fieldObjectInspectors1);

      ArrayList<String> fieldNames2 = new ArrayList<>();
      fieldNames2.add("fourthDouble");
      fieldNames2.add("fifthLong");
      ArrayList<ObjectInspector> fieldObjectInspectors2 = new ArrayList<>();
      fieldObjectInspectors2
          .add(PrimitiveObjectInspectorFactory.javaDoubleObjectInspector);
      fieldObjectInspectors2
          .add(PrimitiveObjectInspectorFactory.javaLongObjectInspector);
      StandardStructObjectInspector soi2 = ObjectInspectorFactory
          .getStandardStructObjectInspector(fieldNames2, fieldObjectInspectors2);

      UnionStructObjectInspector usoi1 = ObjectInspectorFactory.getUnionStructObjectInspector(
          Arrays.asList(new StructObjectInspector[] {soi1, soi2}));
      UnionStructObjectInspector usoi2 = ObjectInspectorFactory.getUnionStructObjectInspector(
          Arrays.asList(new StructObjectInspector[] {soi1, soi2}));

      Assert.assertEquals(usoi1, usoi2);

      // metadata
      Assert.assertEquals(Category.STRUCT, usoi1.getCategory());
      List<? extends StructField> fields = usoi1.getAllStructFieldRefs();
      Assert.assertEquals(5, fields.size());
      for (int i = 0; i < 5; i++) {
        if (i <= 2) {
          Assert.assertEquals(fieldNames1.get(i).toLowerCase(), fields.get(i)
            .getFieldName());
          Assert.assertEquals(fieldObjectInspectors1.get(i), fields.get(i)
            .getFieldObjectInspector());
        } else {
          Assert.assertEquals(fieldNames2.get(i - 3).toLowerCase(), fields.get(i)
            .getFieldName());
          Assert.assertEquals(fieldObjectInspectors2.get(i - 3), fields.get(i)
            .getFieldObjectInspector());
        }
      }
      Assert.assertEquals(fields.get(1), usoi1.getStructFieldRef("secondString"));
      Assert.assertEquals(fields.get(4), usoi1.getStructFieldRef("fifthLong"));

      // null
      for (int i = 0; i < 5; i++) {
        Assert.assertNull(usoi1.getStructFieldData(null, fields.get(i)));
      }

      // real struct
      ArrayList<Object> struct1 = new ArrayList<>(3);
      struct1.add(1);
      struct1.add("two");
      struct1.add(true);
      ArrayList<Object> struct2 = new ArrayList<>(2);
      struct2.add(1.0);
      struct2.add(111);
      ArrayList<Object> struct = new ArrayList<>(2);
      struct.add(struct1);
      struct.add(struct2);
      ArrayList<Object> all = new ArrayList<>(5);
      all.addAll(struct1);
      all.addAll(struct2);

      for (int i = 0; i < 5; i++) {
        Assert.assertEquals(all.get(i), usoi1
          .getStructFieldData(struct, fields.get(i)));
      }
    } catch (Throwable e) {
      e.printStackTrace();
      throw e;
    }
  }

}