src/main/java/org/apache/datasketches/pig/kll/DataToSketch.java [168:201]:
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  @Override
  public DataByteArray getValue() {
    if (this.accumSketch_ != null) {
      return new DataByteArray(this.accumSketch_.toByteArray());
    }
    // return empty sketch
    return new DataByteArray(new KllFloatsSketch(this.k_).toByteArray());
  }

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

  // ALGEBRAIC INTERFACE

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

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

  @Override
  public String getFinal() {
    return Final.class.getName();
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src/main/java/org/apache/datasketches/pig/kll/UnionSketch.java [157:190]:
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  @Override
  public DataByteArray getValue() {
    if (this.accumSketch_ != null) {
      return new DataByteArray(this.accumSketch_.toByteArray());
    }
    // return empty sketch
    return new DataByteArray(new KllFloatsSketch(this.k_).toByteArray());
  }

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

  //ALGEBRAIC INTERFACE

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

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

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