Struct HyperLogLog 

pub struct HyperLogLog { /* private fields */ }

HyperLogLog cardinality estimator.

Uses 2^14 = 16384 registers (12 KB memory). Achieves ~0.8% relative error at any cardinality. Mergeable: hll_a.merge(&hll_b) produces the union cardinality.

Implementations

impl HyperLogLog

pub fn new() -> Self

pub fn with_precision(p: u8) -> Self

pub fn add(&mut self, value: u64)

pub fn add_batch(&mut self, values: &[u64])

pub fn add_f64_batch(&mut self, values: &[f64])

pub fn estimate(&self) -> f64

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

pub fn memory_bytes(&self) -> usize

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

Access raw registers for serialization.

pub fn from_registers(data: &[u8]) -> Self

Reconstruct from serialized registers (assumes precision 14).

Trait Implementations

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.