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A module that is everything required to understands Druid Segments
There is a newer version: 0.12.3
/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.query;

import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.google.common.collect.Ordering;
import com.metamx.common.guava.Sequence;
import io.druid.query.datasourcemetadata.DataSourceMetadataQuery;
import io.druid.query.groupby.GroupByQuery;
import io.druid.query.metadata.metadata.SegmentMetadataQuery;
import io.druid.query.search.search.SearchQuery;
import io.druid.query.select.SelectQuery;
import io.druid.query.spec.QuerySegmentSpec;
import io.druid.query.timeboundary.TimeBoundaryQuery;
import io.druid.query.timeseries.TimeseriesQuery;
import io.druid.query.topn.TopNQuery;
import org.joda.time.Duration;
import org.joda.time.Interval;

import java.util.List;
import java.util.Map;

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "queryType")
@JsonSubTypes(value = {
    @JsonSubTypes.Type(name = Query.TIMESERIES, value = TimeseriesQuery.class),
    @JsonSubTypes.Type(name = Query.SEARCH, value = SearchQuery.class),
    @JsonSubTypes.Type(name = Query.TIME_BOUNDARY, value = TimeBoundaryQuery.class),
    @JsonSubTypes.Type(name = Query.GROUP_BY, value = GroupByQuery.class),
    @JsonSubTypes.Type(name = Query.SEGMENT_METADATA, value = SegmentMetadataQuery.class),
    @JsonSubTypes.Type(name = Query.SELECT, value = SelectQuery.class),
    @JsonSubTypes.Type(name = Query.TOPN, value = TopNQuery.class),
    @JsonSubTypes.Type(name = Query.DATASOURCE_METADATA, value = DataSourceMetadataQuery.class)

})
public interface Query
{
  String TIMESERIES = "timeseries";
  String SEARCH = "search";
  String TIME_BOUNDARY = "timeBoundary";
  String GROUP_BY = "groupBy";
  String SEGMENT_METADATA = "segmentMetadata";
  String SELECT = "select";
  String TOPN = "topN";
  String DATASOURCE_METADATA = "dataSourceMetadata";

  DataSource getDataSource();

  boolean hasFilters();

  String getType();

  Sequence run(QuerySegmentWalker walker, Map context);

  Sequence run(QueryRunner runner, Map context);

  List getIntervals();

  Duration getDuration();

  Map getContext();

   ContextType getContextValue(String key);

   ContextType getContextValue(String key, ContextType defaultValue);

  boolean isDescending();

  Ordering getResultOrdering();

  Query withOverriddenContext(Map contextOverride);

  Query withQuerySegmentSpec(QuerySegmentSpec spec);

  Query withId(String id);

  String getId();

  Query withDataSource(DataSource dataSource);
}