org.apache.druid.segment.serde.CombineFirstTwoValuesColumnarMultiInts Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of druid-processing Show documentation
A module that is everything required to understands Druid Segments
There is a newer version: 30.0.1
/*
 * 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.druid.segment.serde;

import com.google.common.collect.Iterators;
import org.apache.druid.common.config.NullHandling;
import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector;
import org.apache.druid.segment.data.ColumnarMultiInts;
import org.apache.druid.segment.data.Indexed;
import org.apache.druid.segment.data.IndexedInts;
import org.apache.druid.segment.data.ZeroIndexedInts;

import javax.annotation.Nullable;
import java.io.IOException;
import java.util.Iterator;

/**
 * A {@link ColumnarMultiInts} that delegates to an underyling instance, but applies
 * {@link CombineFirstTwoValuesIndexedInts} to each row's set of values.
 *
 * Provided to enable compatibility for segments written under {@link NullHandling#sqlCompatible()} mode but
 * read under {@link NullHandling#replaceWithDefault()} mode.
 *
 * @see NullHandling#mustCombineNullAndEmptyInDictionary(Indexed)
 */
public class CombineFirstTwoValuesColumnarMultiInts implements ColumnarMultiInts
{
  private final ColumnarMultiInts delegate;
  private final CombineFirstTwoValuesIndexedInts rowValues;

  public CombineFirstTwoValuesColumnarMultiInts(ColumnarMultiInts delegate)
  {
    this.delegate = delegate;
    this.rowValues = new CombineFirstTwoValuesIndexedInts(ZeroIndexedInts.instance());
  }

  @Override
  public IndexedInts get(int index)
  {
    rowValues.delegate = delegate.get(index);
    return rowValues;
  }

  @Override
  public IndexedInts getUnshared(int index)
  {
    return new CombineFirstTwoValuesIndexedInts(delegate.getUnshared(index));
  }

  @Override
  public int size()
  {
    return delegate.size();
  }

  @Override
  public int indexOf(@Nullable IndexedInts value)
  {
    // No ColumnarMultiInts implement this method
    throw new UnsupportedOperationException("Reverse lookup not allowed.");
  }

  @Override
  public boolean isSorted()
  {
    return delegate.isSorted();
  }

  @Override
  public void inspectRuntimeShape(RuntimeShapeInspector inspector)
  {
    delegate.inspectRuntimeShape(inspector);
  }

  @Override
  public Iterator iterator()
  {
    return Iterators.transform(
        delegate.iterator(),
        CombineFirstTwoValuesIndexedInts::new
    );
  }

  @Override
  public void close() throws IOException
  {
    delegate.close();
  }
}