Struct RowUniquenessTracker 

pub struct RowUniquenessTracker { /* private fields */ }

Full-stream row-duplicate tracking with bounded memory.

Every record’s fields are folded into a canonical length-prefixed signature and fed to a CardinalityEstimator: duplicates are counted exactly while the distinct-row signatures fit the estimator’s exact set, and estimated (flagged approximate) once it spills to its HLL sketch. Unlike the per-column reservoirs, this sees whole rows — including null-like values — so the count is row-aligned by construction.

Implementations

impl RowUniquenessTracker

pub fn observe(&mut self, signature: String)

pub fn rows_seen(&self) -> usize

pub fn duplicate_rows(&self) -> usize

Rows minus distinct rows; exact until the estimator spills.

pub fn is_approximate(&self) -> bool

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

pub fn memory_usage_bytes(&self) -> usize

pub fn summary(&self) -> Option<RowDuplicateSummary>

Summary for quality metrics, or None when no rows were observed (e.g. an engine that never fed whole records through this tracker).

Trait Implementations

impl Clone for RowUniquenessTracker

fn clone(&self) -> RowUniquenessTracker

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowUniquenessTracker

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

Formats the value using the given formatter.

impl Default for RowUniquenessTracker

fn default() -> RowUniquenessTracker

Returns the “default value” for a type.