Struct HyperLogLog

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pub struct HyperLogLog { /* private fields */ }

Expand description

HyperLogLog for cardinality estimation

Estimates the number of unique elements with ~1.04/√m relative error where m is the number of registers.

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impl HyperLogLog

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pub fn new(precision: u8) -> Self

Create a new HyperLogLog with given precision

§Arguments

precision - Number of bits for register indexing (4-18, higher = more accurate)

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pub fn add<T: Hash>(&self, item: &T)

Add an item to the estimator

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pub fn estimate(&self) -> u64

Estimate the cardinality

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

Merge another HyperLogLog into this one

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pub fn memory_usage(&self) -> usize

Get memory usage in bytes

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pub fn relative_error(&self) -> f64

Get the relative error (theoretical)

Auto Trait Implementations§

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impl UnwindSafe for HyperLogLog

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impl<T> Any for T
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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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