/**
* Adds sum, sumOfSquares, mean, stddev, and percentiles to the given NamedList
*
* @param res NamedList to add the type specific statistics too
*/
@Override
protected void addTypeSpecificStats(NamedList<Object> res) {
if (statsField.includeInResponse(Stat.sum)) {
res.add("sum", sum);
}
if (statsField.includeInResponse(Stat.sumOfSquares)) {
res.add("sumOfSquares", sumOfSquares);
}
if (statsField.includeInResponse(Stat.mean)) {
res.add("mean", sum / count);
}
if (statsField.includeInResponse(Stat.stddev)) {
res.add("stddev", getStandardDeviation());
}
if (statsField.includeInResponse(Stat.percentiles)) {
if (statsField.getIsShard()) {
// as of current t-digest version, smallByteSize() internally does a full conversion in
// order to determine what the size is (can't be precomputed?) .. so rather then
// serialize to a ByteBuffer twice, allocate the max possible size buffer,
// serialize once, and then copy only the byte[] subset that we need, and free up the buffer
ByteBuffer buf = ByteBuffer.allocate(tdigest.byteSize()); // upper bound
tdigest.asSmallBytes(buf);
res.add("percentiles", Arrays.copyOf(buf.array(), buf.position()));
} else {
NamedList<Object> percentileNameList = new NamedList<Object>();
for (Double percentile : statsField.getPercentilesList()) {
// Empty document set case
if (tdigest.size() == 0) {
percentileNameList.add(percentile.toString(), null);
} else {
Double cutoff = tdigest.quantile(percentile / 100);
percentileNameList.add(percentile.toString(), cutoff);
}
}
res.add("percentiles", percentileNameList);
}
}
}
