src/main/java/org/apache/datasketches/pig/kll/UnionSketch.java [345:361]:
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      final DataBag outerBag = (DataBag) inputTuple.get(0);
      for (final Tuple dataTuple: outerBag) {
        final Object f0 = dataTuple.get(0);
        if (f0 == null) { continue; }
        if (f0 instanceof DataBag) {
          final DataBag innerBag = (DataBag) f0; //inputTuple.bag0.dataTupleN.f0:bag
          if (innerBag.size() == 0) { continue; }
          // If field 0 of a dataTuple is again a Bag all tuples of this inner bag
          // will be passed into the union.
          // It is due to system bagged outputs from multiple mapper Initial functions.
          // The Intermediate stage was bypassed.
          updateUnion(innerBag, union);
        } else if (f0 instanceof DataByteArray) { //inputTuple.bag0.dataTupleN.f0:DBA
          // If field 0 of a dataTuple is a DataByteArray we assume it is a sketch from a prior call
          // It is due to system bagged outputs from multiple mapper Intermediate functions.
          // Each dataTuple.DBA:sketch will merged into the union.
          final DataByteArray dba = (DataByteArray) f0;
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src/main/java/org/apache/datasketches/pig/quantiles/UnionDoublesSketch.java [330:346]:
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        final DataBag outerBag = (DataBag) inputTuple.get(0);
        for (final Tuple dataTuple: outerBag) {
          final Object f0 = dataTuple.get(0);
          if (f0 == null) { continue; }
          if (f0 instanceof DataBag) {
            final DataBag innerBag = (DataBag) f0; //inputTuple.bag0.dataTupleN.f0:bag
            if (innerBag.size() == 0) { continue; }
            // If field 0 of a dataTuple is again a Bag all tuples of this inner bag
            // will be passed into the union.
            // It is due to system bagged outputs from multiple mapper Initial functions.
            // The Intermediate stage was bypassed.
            updateUnion(innerBag, union);
          } else if (f0 instanceof DataByteArray) { //inputTuple.bag0.dataTupleN.f0:DBA
            // If field 0 of a dataTuple is a DataByteArray we assume it is a sketch from a prior call
            // It is due to system bagged outputs from multiple mapper Intermediate functions.
            // Each dataTuple.DBA:sketch will merged into the union.
            final DataByteArray dba = (DataByteArray) f0;
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