public Tuple exec()

in src/main/java/org/apache/datasketches/pig/tuple/ArrayOfDoublesSketchToEstimates.java [45:68]

• 22 lines of code
• 7 McCabe index (conditional complexity)

  public Tuple exec(final Tuple input) throws IOException {
    if (input == null || input.size() == 0) {
      return null;
    }

    final DataByteArray dba = (DataByteArray) input.get(0);
    final ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.wrapSketch(Memory.wrap(dba.get()));

    final double[] estimates = new double[sketch.getNumValues() + 1];
    estimates[0] = sketch.getEstimate();
    if (sketch.getRetainedEntries() > 0) { // remove unnecessary check when version of sketches-core > 0.4.0
      final ArrayOfDoublesSketchIterator it = sketch.iterator();
      while (it.next()) {
        final double[] values = it.getValues();
        for (int i = 0; i < sketch.getNumValues(); i++) {
          estimates[i + 1] += values[i];
        }
      }
      for (int i = 0; i < sketch.getNumValues(); i++) {
        estimates[i + 1] /= sketch.getTheta();
      }
    }
    return Util.doubleArrayToTuple(estimates);
  }