src/main/java/org/apache/datasketches/pig/quantiles/DataToDoublesSketch.java [209:246]:
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  @Override
  public Tuple getValue() {
    if (this.accumUnion_ != null) {
      final DoublesSketch resultSketch = this.accumUnion_.getResultAndReset();
      if (resultSketch != null) {
        return tupleFactory_.newTuple(new DataByteArray(resultSketch.toByteArray(true)));
      }
    }
    // return empty sketch
    return tupleFactory_.newTuple(
      new DataByteArray(this.unionBuilder_.build().getResult().toByteArray(true)));
  }

  /**
   * Cleans up the UDF state after being called using the {@link Accumulator} interface.
   *
   * @see "org.apache.pig.Accumulator.cleanup()"
   */
  @Override
  public void cleanup() {
    this.accumUnion_ = null;
  }

  // ALGEBRAIC INTERFACE

  @Override
  public String getInitial() {
    return Initial.class.getName();
  }

  @Override
  public String getIntermed() {
    return IntermediateFinal.class.getName();
  }

  @Override
  public String getFinal() {
    return IntermediateFinal.class.getName();
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src/main/java/org/apache/datasketches/pig/quantiles/UnionDoublesSketch.java [188:225]:
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  @Override
  public Tuple getValue() {
    if (this.accumUnion_ != null) {
      final DoublesSketch resultSketch = this.accumUnion_.getResultAndReset();
      if (resultSketch != null) {
        return tupleFactory_.newTuple(new DataByteArray(resultSketch.toByteArray(true)));
      }
    }
    // return empty sketch
    return tupleFactory_.newTuple(
        new DataByteArray(this.unionBuilder_.build().getResult().toByteArray(true)));
  }

  /**
   * Cleans up the UDF state after being called using the {@link Accumulator} interface.
   *
   * @see "org.apache.pig.Accumulator.cleanup()"
   */
  @Override
  public void cleanup() {
    this.accumUnion_ = null;
  }

  //ALGEBRAIC INTERFACE

  @Override
  public String getInitial() {
    return Initial.class.getName();
  }

  @Override
  public String getIntermed() {
    return IntermediateFinal.class.getName();
  }

  @Override
  public String getFinal() {
    return IntermediateFinal.class.getName();
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