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A module that is everything required to understands Druid Segments
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/*
 * 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.query.filter;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.collect.RangeSet;
import com.google.common.collect.TreeRangeSet;
import org.apache.druid.java.util.common.StringUtils;
import org.apache.druid.segment.filter.Filters;

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

/**
 *
 */
public class OrDimFilter extends AbstractOptimizableDimFilter implements DimFilter
{
  private static final Joiner OR_JOINER = Joiner.on(" || ");

  private final List fields;

  @JsonCreator
  public OrDimFilter(@JsonProperty("fields") List fields)
  {
    fields = DimFilters.filterNulls(fields);
    Preconditions.checkArgument(fields.size() > 0, "OR operator requires at least one field");
    this.fields = fields;
  }

  public OrDimFilter(DimFilter... fields)
  {
    this(Arrays.asList(fields));
  }

  public OrDimFilter(String dimensionName, String value, String... values)
  {
    fields = new ArrayList<>(values.length + 1);
    fields.add(new SelectorDimFilter(dimensionName, value, null));
    for (String val : values) {
      fields.add(new SelectorDimFilter(dimensionName, val, null));
    }
  }

  @JsonProperty
  public List getFields()
  {
    return fields;
  }

  @Override
  public byte[] getCacheKey()
  {
    return DimFilterUtils.computeCacheKey(DimFilterUtils.OR_CACHE_ID, fields);
  }

  @Override
  public DimFilter optimize()
  {
    // This method optimizes children, but doesn't do any special AND-related stuff like flattening or duplicate
    // removal. That will happen in "toFilter", which allows us to share code with Filters.or(...).

    final List newFields = DimFilters.optimize(fields);

    if (newFields.size() == 1) {
      return newFields.get(0);
    } else {
      return new OrDimFilter(newFields);
    }
  }

  @Override
  public Filter toFilter()
  {
    return Filters.or(Filters.toFilters(fields));
  }

  @Override
  public RangeSet getDimensionRangeSet(String dimension)
  {
    RangeSet retSet = TreeRangeSet.create();
    for (DimFilter field : fields) {
      RangeSet rangeSet = field.getDimensionRangeSet(dimension);
      if (rangeSet == null) {
        return null;
      } else {
        retSet.addAll(rangeSet);
      }
    }
    return retSet;
  }

  @Override
  public Set getRequiredColumns()
  {
    HashSet requiredColumns = new HashSet<>();
    fields.forEach(field -> requiredColumns.addAll(field.getRequiredColumns()));
    return requiredColumns;
  }

  @Override
  public boolean equals(Object o)
  {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    OrDimFilter that = (OrDimFilter) o;

    if (fields != null ? !fields.equals(that.fields) : that.fields != null) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode()
  {
    return fields != null ? fields.hashCode() : 0;
  }

  @Override
  public String toString()
  {
    return StringUtils.format("(%s)", OR_JOINER.join(fields));
  }
}