public List evaluate()

in src/main/java/org/apache/datasketches/hive/tuple/ArrayOfDoublesSketchToVariancesUDF.java [47:62]

• 14 lines of code
• 4 McCabe index (conditional complexity)

  public List<Double> evaluate(final BytesWritable serializedSketch) {
    if (serializedSketch == null) { return null; }
    final ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.wrapSketch(
        BytesWritableHelper.wrapAsMemory(serializedSketch));

    if (sketch.getRetainedEntries() < 1) {
      return null;
    }

    final SummaryStatistics[] summaries = ArrayOfDoublesSketchStats.sketchToSummaryStatistics(sketch);
    final List<Double> variances = new ArrayList<>(sketch.getNumValues());
    for (int i = 0; i < sketch.getNumValues(); i++) {
      variances.add(summaries[i].getVariance());
    }
    return variances;
  }