src/main/java/org/apache/datasketches/pig/tuple/DataToDoubleSummarySketch.java [58:93]:
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  @Override
  public String getInitial() {
    return Initial.class.getName();
  }

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

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

  public static class Initial extends AlgebraicInitial {

    /**
     * Constructor wit default sketch size and default mode
     */
    public Initial() {}

    /**
     * Constructor for the initial pass of an Algebraic function. This will be passed the same
     * constructor arguments as the original UDF.
     * @param sketchSize String representation of sketch size
     */
    public Initial(final String sketchSize) {}

    /**
     * Constructor for the initial pass of an Algebraic function. This will be passed the same
     * constructor arguments as the original UDF.
     * @param sketchSize String representation of sketch size
     * @param summaryMode String representation of mode (sum, min or max)
     */
    public Initial(final String sketchSize, final String summaryMode) {}
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src/main/java/org/apache/datasketches/pig/tuple/UnionDoubleSummarySketch.java [62:97]:
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  @Override
  public String getInitial() {
    return Initial.class.getName();
  }

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

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

  public static class Initial extends AlgebraicInitial {
    /**
     * Constructor for the initial pass of an Algebraic function.
     * Default sketch size and default mode.
     */
    public Initial() {}

    /**
     * Constructor for the initial pass of an Algebraic function. This will be passed the same
     * constructor arguments as the original UDF.
     * @param sketchSize String representation of sketch size
     */
    public Initial(final String sketchSize) {}

    /**
     * Constructor for the initial pass of an Algebraic function. This will be passed the same
     * constructor arguments as the original UDF.
     * @param sketchSize String representation of sketch size
     * @param summaryMode String representation of mode (sum, min or max)
     */
    public Initial(final String sketchSize, final String summaryMode) {}
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