Struct QueryOptimizer 

pub struct QueryOptimizer { /* private fields */ }

Query optimizer with cost-based planning

Implementations

impl QueryOptimizer

pub fn new() -> Self

Create a new query optimizer

pub fn with_cost_model(cost_model: CostModel) -> Self

Create with custom cost model

pub fn update_total_edges(&mut self, count: usize, _source: CardinalitySource)

Update total edge count for cardinality estimation

pub fn set_cardinality_hint(&mut self, column: &str, hint: CardinalityHint)

Set cardinality hint for a column

pub fn plan_query( &self, predicates: &[QueryPredicate], limit: Option<usize>, ) -> QueryPlan

Plan a query using cost-based index selection

Evaluates each candidate index against a full scan, choosing the cheapest access path based on selectivity × row count.

pub fn estimate_selectivity(&self, predicate: &QueryPredicate) -> f64

Estimate selectivity of a predicate

Trait Implementations

impl Debug for QueryOptimizer

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

Formats the value using the given formatter.

impl Default for QueryOptimizer

fn default() -> QueryOptimizer

Returns the “default value” for a type.