Struct CardinalityEstimator 

pub struct CardinalityEstimator { /* private fields */ }

Cardinality estimator.

Implementations

impl CardinalityEstimator

pub fn new() -> Self

Creates a new cardinality estimator with default settings.

pub fn with_selectivity_config(config: SelectivityConfig) -> Self

Creates a new cardinality estimator with custom selectivity configuration.

pub fn selectivity_config(&self) -> &SelectivityConfig

Returns the current selectivity configuration.

pub fn create_estimation_log() -> EstimationLog

Creates an estimation log with the default re-planning threshold (10x).

pub fn from_statistics(stats: &Statistics) -> Self

Creates a cardinality estimator pre-populated from store statistics.

Maps LabelStatistics to TableStats and computes the average edge fanout from EdgeTypeStatistics. Falls back to defaults for any missing statistics.

pub fn add_table_stats(&mut self, name: &str, stats: TableStats)

Adds statistics for a table/label.

pub fn set_avg_fanout(&mut self, fanout: f64)

Sets the average edge fanout.

pub fn estimate(&self, op: &LogicalOperator) -> f64

Estimates the cardinality of a logical operator.

Trait Implementations

impl Default for CardinalityEstimator

fn default() -> Self

Returns the “default value” for a type.