@Override
    protected void onMerge(AggregationResult obj) {
        StandardDeviationAggregationResult other = (StandardDeviationAggregationResult) obj;
        count += other.count;
        sum += other.sum;
        sumOfSquared += other.sumOfSquared;
    }
Constructor used for deserialization. Will be instantiated with a default sketch.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/StandardDeviationAggregationResult.java