public Tuple exec()

in src/main/java/org/apache/datasketches/pig/frequencies/UnionFrequentItemsSketchAlgebraicIntermediateFinal.java [59:93]

28 lines of code
8 McCabe index (conditional complexity)


  public Tuple exec(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("algebraic is used");
      this.isFirstCall_ = false;
    }
    final ItemsSketch<T> sketch = new ItemsSketch<>(this.sketchSize_);

    final DataBag bag = (DataBag) inputTuple.get(0);
    if (bag == null) {
      throw new IllegalArgumentException("InputTuple.Field0: Bag may not be null");
    }

    for (Tuple dataTuple: bag) {
      final Object item = dataTuple.get(0);
      if (item instanceof DataBag) {
        // this is from a prior call to the initial function, so there is a nested bag.
        for (final Tuple innerTuple: (DataBag) item) {
          final ItemsSketch<T> incomingSketch = Util.deserializeSketchFromTuple(innerTuple, this.serDe_);
          sketch.merge(incomingSketch);
        }
      } else if (item instanceof DataByteArray) {
        // This is a sketch from a call to the Intermediate function
        // Merge it with the current sketch.
        final ItemsSketch<T> incomingSketch = Util.deserializeSketchFromTuple(dataTuple, this.serDe_);
        if (incomingSketch.isEmpty()) { continue; }
        sketch.merge(incomingSketch);
      } else {
        // we should never get here.
        throw new IllegalArgumentException(
            "InputTuple.Field0: Bag contains unrecognized types: " + item.getClass().getName());
      }
    }
    return Util.serializeSketchToTuple(sketch, this.serDe_);
  }