@Override
public InternalAggregation buildAggregation(long owningBucketOrdinal) {
if (counts == null
|| owningBucketOrdinal >= counts.maxBucket()
|| counts.cardinality(owningBucketOrdinal) == 0) {
return buildEmptyAggregation();
}
// We need to build a copy because the returned Aggregation needs remain usable after
// this Aggregator (and its HLL++ counters) is released.
HyperLogLogPlusPlus copy =
new HyperLogLogPlusPlus(precision, BigArrays.NON_RECYCLING_INSTANCE, 1);
copy.merge(0, counts, owningBucketOrdinal);
return new InternalCardinality(name, copy, formatter);
}
@Override
public double metric(long owningBucketOrd) {
return counts == null ? 0 : counts.cardinality(owningBucketOrd);
}
