Struct Optimizer 

pub struct Optimizer { /* private fields */ }

Multi-pass rule-based optimizer.

Passes are applied left-to-right in the order they were registered. The default pipeline is constructed by Optimizer::new.

Implementations

impl Optimizer

pub fn new() -> Self

Build the default five-pass optimizer pipeline.

The ProjectionPruning pass is created with an empty required set, which means it operates as a no-op unless a caller explicitly builds an optimizer with a non-empty requirement list via Optimizer::with_passes.

pub fn with_passes(passes: Vec<Box<dyn OptPass>>) -> Self

Build an optimizer with a custom ordered list of passes.

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

Run all registered passes over plan in registration order.

impl Optimizer

pub fn with_cost_model(model: CostModel) -> Self

Create an Optimizer with the standard pipeline plus cost-aware passes.

Cost-aware passes (such as JoinReorder) own an Arc<CostModel> and require this constructor to be registered. Currently this returns the same five-pass pipeline as Optimizer::new; cost-aware passes will attach themselves here as they are added in subsequent phases.

Trait Implementations

impl Default for Optimizer

fn default() -> Self

Returns the “default value” for a type.