src/main/java/org/apache/datasketches/hive/theta/DataToSketchUDAF.java [167:197]:
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      if (mode == Mode.PARTIAL1 || mode == Mode.PARTIAL2) {
        // intermediate results need to include the the nominal number of entries and the seed
        return ObjectInspectorFactory.getStandardStructObjectInspector(
          Arrays.asList(NOMINAL_ENTRIES_FIELD, SEED_FIELD, SKETCH_FIELD),
          Arrays.asList(
            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.INT),
            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.LONG),
            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY)
          )
        );
      }
      // final results include just the sketch
      return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY);
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator#iterate(org
     * .apache
     * .hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.AggregationBuffer,
     * java.lang.Object[])
     */
    @Override
    public void iterate(final AggregationBuffer agg,
        final Object[] parameters) throws HiveException {
      if (parameters[0] == null) { return; }
      final UnionState state = (UnionState) agg;
      if (!state.isInitialized()) {
        initializeState(state, parameters);
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src/main/java/org/apache/datasketches/hive/theta/UnionSketchUDAF.java [134:163]:
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      if (mode == Mode.PARTIAL1 || mode == Mode.PARTIAL2) {
        // intermediate results need to include the nominal number of entries and the seed
        return ObjectInspectorFactory.getStandardStructObjectInspector(
          Arrays.asList(NOMINAL_ENTRIES_FIELD, SEED_FIELD, SKETCH_FIELD),
          Arrays.asList(
            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.INT),
            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.LONG),
            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY)
          )
        );
      }
      // final results include just the sketch
      return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY);
    }

    /**
     * Add the incoming sketch into the internal state.
     *
     * @param agg
     *          aggregation buffer storing intermediate results.
     * @param parameters
     *          sketches in the form of Object passed in to be merged.
     */
    @Override
    public void iterate(final AggregationBuffer agg,
        final Object[] parameters) throws HiveException {
      if (parameters[0] == null) { return; }
      final UnionState state = (UnionState) agg;
      if (!state.isInitialized()) {
        initializeState(state, parameters);
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