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A module that is everything required to understands Druid Segments

There is a newer version: 31.0.0

/*
 * 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;

import org.apache.druid.segment.column.ColumnDescriptor;

/**
 * Processing related interface
 *
 * DimensionMerger subclass to be used with IndexMergerV9.
 */
public interface DimensionMergerV9 extends DimensionMerger
{
  /**
   * Return a ColumnDescriptor containing ColumnPartSerde objects appropriate for
   * this DimensionMerger's value metadata, sequence of row values, and index structures.
   *
   * @return ColumnDescriptor that IndexMergerV9 will use to build a column.
   */
  ColumnDescriptor makeColumnDescriptor();
}