Struct Optimizer 

pub struct Optimizer { /* private fields */ }

Query optimizer that transforms logical plans for better performance.

Implementations

impl Optimizer

pub fn new() -> Self

Creates a new optimizer with default settings.

pub fn with_filter_pushdown(self, enabled: bool) -> Self

Enables or disables filter pushdown.

pub fn with_join_reorder(self, enabled: bool) -> Self

Enables or disables join reordering.

pub fn with_cost_model(self, cost_model: CostModel) -> Self

Sets the cost model.

pub fn with_cardinality_estimator(self, estimator: CardinalityEstimator) -> Self

Sets the cardinality estimator.

pub fn cost_model(&self) -> &CostModel

Returns a reference to the cost model.

pub fn cardinality_estimator(&self) -> &CardinalityEstimator

Returns a reference to the cardinality estimator.

pub fn estimate_cost(&self, plan: &LogicalPlan) -> Cost

Estimates the cost of a plan.

pub fn estimate_cardinality(&self, plan: &LogicalPlan) -> f64

Estimates the cardinality of a plan.

pub fn optimize(&self, plan: LogicalPlan) -> Result<LogicalPlan>

Optimizes a logical plan.

Errors

Returns an error if optimization fails.

Trait Implementations

impl Default for Optimizer

fn default() -> Self

Returns the “default value” for a type.