src/main/java/org/apache/datasketches/hive/cpc/UnionSketchUDAF.java [153:178]:
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            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY)
          )
        );
      }
      // final results include just the sketch
      return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY);
    }

    /**
     * Add the incoming sketch into the internal state.
     *
     * @param buf
     *          aggregation buffer storing intermediate results.
     * @param parameters
     *          sketches in the form of Object passed in to be merged.
     */
    @Override
    public void iterate(final AggregationBuffer buf,
        final Object[] parameters) throws HiveException {
      if (parameters[0] == null) { return; }
      final UnionState state = (UnionState) buf;
      if (!state.isInitialized()) {
        initializeState(state, parameters);
      }
      final byte[] serializedSketch = (byte[]) this.inputInspector_.getPrimitiveJavaObject(parameters[0]);
      if (serializedSketch == null) { return; }
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src/main/java/org/apache/datasketches/hive/hll/UnionSketchUDAF.java [153:178]:
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            PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY)
          )
        );
      }
      // final results include just the sketch
      return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY);
    }

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