Struct HyperLogLog 

pub struct HyperLogLog { /* private fields */ }

HyperLogLog cardinality estimator

Implementations

impl HyperLogLog

pub fn new() -> Self

Create a new HLL with 16384 registers (~16KB memory)

pub fn with_precision(precision: u8) -> Option<Self>

pub fn precision(&self) -> u8

pub fn add(&mut self, data: &[u8])

Add an element to the HLL

pub fn count(&self) -> u64

Estimate the cardinality (number of distinct elements)

pub fn merge(&mut self, other: &HyperLogLog)

Merge another HLL into this one (union)

pub fn merged(a: &HyperLogLog, b: &HyperLogLog) -> HyperLogLog

Create a merged HLL from two HLLs without modifying either

pub fn clear(&mut self)

Clear the HLL

pub fn memory_bytes(&self) -> usize

Memory usage in bytes

pub fn as_bytes(&self) -> &[u8]

Serialize to bytes

pub fn from_bytes(bytes: Vec<u8>) -> Option<Self>

Deserialize from bytes

Trait Implementations

impl Clone for HyperLogLog

fn clone(&self) -> HyperLogLog

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HyperLogLog

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for HyperLogLog

fn default() -> Self

Returns the “default value” for a type.