src/main/java/org/apache/datasketches/pig/tuple/UnionArrayOfDoublesSketchBase.java [74:88]:
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    return Util.tupleFactory.newTuple(new DataByteArray(union.getResult().toByteArray()));
  }

  @Override
  public void accumulate(final Tuple inputTuple) throws IOException {
    if (this.isFirstCall_) {
      // this is to see in the log which way was used by Pig
      Logger.getLogger(getClass()).info("accumulator is used");
      this.isFirstCall_ = false;
    }
    if (inputTuple == null || inputTuple.size() != 1) {
      return;
    }
    final DataBag bag = (DataBag) inputTuple.get(0);
    if (bag == null || bag.size() == 0) { return; }
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src/main/java/org/apache/datasketches/pig/tuple/UnionSketch.java [90:104]:
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    return Util.tupleFactory.newTuple(new DataByteArray(union.getResult().toByteArray()));
  }

  @Override
  public void accumulate(final Tuple inputTuple) throws IOException {
    if (this.isFirstCall_) {
      // this is to see in the log which way was used by Pig
      Logger.getLogger(getClass()).info("accumulator is used");
      this.isFirstCall_ = false;
    }
    if (inputTuple == null || inputTuple.size() != 1) {
      return;
    }
    final DataBag bag = (DataBag) inputTuple.get(0);
    if (bag == null || bag.size() == 0) { return; }
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