public Tuple exec()

in src/main/java/org/apache/datasketches/pig/quantiles/UnionDoublesSketch.java [327:361]
27 lines of code
9 McCabe index (conditional complexity)

    public Tuple exec(final Tuple inputTuple) throws IOException {
      if (inputTuple != null && inputTuple.size() > 0) {
        final DoublesUnion union = this.unionBuilder_.build();
        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;
            union.update(Memory.wrap(dba.get()));
          } else {
            throw new IllegalArgumentException("dataTuple.Field0: Is not a DataByteArray: "
              + f0.getClass().getName());
          }
        }
        final DoublesSketch resultSketch = union.getResultAndReset();
        if (resultSketch != null) {
          return tupleFactory_.newTuple(new DataByteArray(resultSketch.toByteArray(true)));
        }
      }
      // return empty sketch
      return tupleFactory_.newTuple(
          new DataByteArray(this.unionBuilder_.build().getResult().toByteArray(true)));
    }