src/main/java/org/apache/datasketches/hive/cpc/DataToSketchUDAF.java [111:151]:
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      if (!ObjectInspectorUtils.isConstantObjectInspector(inspectors[2])) {
        throw new UDFArgumentTypeException(2, "The third argument must be a constant");
      }
    }

    return new DataToSketchEvaluator();
  }

  public static class DataToSketchEvaluator extends SketchEvaluator {

    private Mode mode_;

    @Override
    public AggregationBuffer getNewAggregationBuffer() throws HiveException {
      // Different State is used for the iterate phase and the merge phase.
      // SketchState is more space-efficient, so let's use SketchState if possible.
      if (this.mode_ == Mode.PARTIAL1 || this.mode_ == Mode.COMPLETE) { // iterate() will be used
        return new SketchState();
      }
      return new UnionState();
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator#init(org.apache
     * .hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.Mode,
     * org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[])
     */
    @Override
    public ObjectInspector init(final Mode mode, final ObjectInspector[] parameters) throws HiveException {
      super.init(mode, parameters);
      this.mode_ = mode;
      if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) {
        // input is original data
        this.inputInspector_ = (PrimitiveObjectInspector) parameters[0];
        if (parameters.length > 1) {
          this.lgKInspector_ = (PrimitiveObjectInspector) parameters[1];
        }
        if (parameters.length > 2) {
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src/main/java/org/apache/datasketches/hive/hll/DataToSketchUDAF.java [111:154]:
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      if (!ObjectInspectorUtils.isConstantObjectInspector(inspectors[2])) {
        throw new UDFArgumentTypeException(2, "The third argument must be a constant");
      }
    }

    return new DataToSketchEvaluator();
  }

  public static class DataToSketchEvaluator extends SketchEvaluator {

    private Mode mode_;

    @Override
    public AggregationBuffer getNewAggregationBuffer() throws HiveException {
      // Different State is used for the iterate phase and the merge phase.
      // A user reported that in some version of Hive this was apparently called before init,
      // so the mode_ was null. A solution was implemented to have UnionState, which can work
      // in both cases, but SketchState is more space-efficient.
      // HLL sketch is about compactness, so let's use SketchState if possible.
      if (this.mode_ == Mode.PARTIAL1 || this.mode_ == Mode.COMPLETE) { // iterate() will be used
        return new SketchState();
      }
      return new UnionState();
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator#init(org.apache
     * .hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.Mode,
     * org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[])
     */
    @Override
    public ObjectInspector init(final Mode mode, final ObjectInspector[] parameters) throws HiveException {
      super.init(mode, parameters);
      this.mode_ = mode;
      if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) {
        // input is original data
        this.inputInspector_ = (PrimitiveObjectInspector) parameters[0];
        if (parameters.length > 1) {
          this.lgKInspector_ = (PrimitiveObjectInspector) parameters[1];
        }
        if (parameters.length > 2) {
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