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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
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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package org.apache.druid.query.search;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import org.apache.druid.collections.bitmap.BitmapFactory;
import org.apache.druid.collections.bitmap.ConciseBitmapFactory;
import org.apache.druid.collections.bitmap.RoaringBitmapFactory;
import org.apache.druid.java.util.common.IAE;
import org.apache.druid.query.Druids;
import org.apache.druid.query.dimension.DimensionSpec;
import org.apache.druid.query.filter.Filter;
import org.apache.druid.segment.QueryableIndex;
import org.apache.druid.segment.Segment;
import org.apache.druid.segment.data.Indexed;
import org.apache.druid.segment.filter.Filters;
import org.joda.time.Interval;

import java.util.List;

public abstract class SearchStrategy
{
  protected final Filter filter;
  protected final Interval interval;

  protected SearchStrategy(SearchQuery query)
  {
    this.filter = Filters.convertToCNFFromQueryContext(query, Filters.toFilter(query.getDimensionsFilter()));
    final List intervals = query.getQuerySegmentSpec().getIntervals();
    if (intervals.size() != 1) {
      throw new IAE("Should only have one interval, got[%s]", intervals);
    }
    this.interval = intervals.get(0);
  }

  public abstract List getExecutionPlan(SearchQuery query, Segment segment);

  public SearchQueryDecisionHelper getDecisionHelper(QueryableIndex index)
  {
    final BitmapFactory bitmapFactory = index.getBitmapFactoryForDimensions();
    if (bitmapFactory.getClass().equals(ConciseBitmapFactory.class)) {
      return ConciseBitmapDecisionHelper.instance();
    } else if (bitmapFactory.getClass().equals(RoaringBitmapFactory.class)) {
      return RoaringBitmapDecisionHelper.instance();
    } else {
      throw new IAE("Unknown bitmap type[%s]", bitmapFactory.getClass().getName());
    }
  }

  static List getDimsToSearch(Indexed availableDimensions, List dimensions)
  {
    if (dimensions == null || dimensions.isEmpty()) {
      return ImmutableList.copyOf(Iterables.transform(availableDimensions, Druids.DIMENSION_IDENTITY));
    } else {
      return dimensions;
    }
  }
}