private void _serialise(final HyperLogLogPlus hyperLogLogPlus, final JsonGenerator jsonGenerator)
throws IOException {
jsonGenerator.writeObjectFieldStart("hyperLogLogPlus");
jsonGenerator.writeObjectField(
HyperLogLogPlusJsonConstants.HYPER_LOG_LOG_PLUS_SKETCH_BYTES_FIELD,
hyperLogLogPlus.getBytes());
jsonGenerator.writeNumberField(
HyperLogLogPlusJsonConstants.CARDINALITY_FIELD, hyperLogLogPlus.cardinality());
jsonGenerator.writeEndObject();
}
protected static HyperLogLogPlus countDisctinct(Tuple input, int p)
throws NumberFormatException, IOException {
HyperLogLogPlus estimator = new HyperLogLogPlus(p);
DataBag values = (DataBag) input.get(0);
for (Iterator<Tuple> it = values.iterator(); it.hasNext(); ) {
Tuple t = it.next();
Object data = t.get(0);
if (data instanceof Long) {
estimator.offerHashed((Long) data);
} else if (data instanceof DataByteArray) {
DataByteArray bytes = (DataByteArray) data;
HyperLogLogPlus newEstimator;
try {
newEstimator = HyperLogLogPlus.Builder.build(bytes.get());
estimator = (HyperLogLogPlus) estimator.merge(newEstimator);
} catch (IOException e) {
throw new RuntimeException(e);
} catch (CardinalityMergeException e) {
throw new RuntimeException(e);
}
}
}
return estimator;
}