src/main/java/org/apache/datasketches/pig/cpc/UnionSketch.java [171:188]:
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  @Override
  public void cleanup() {
    this.accumUnion_ = null;
  }

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

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

  @Override
  public String getFinal() {
    return UnionSketchAlgebraicFinal.class.getName();
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src/main/java/org/apache/datasketches/pig/hll/UnionSketch.java [176:193]:
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  @Override
  public void cleanup() {
    this.accumUnion_ = null;
  }

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

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

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