Trait datafusion::optimizer::optimizer::OptimizerRule

pub trait OptimizerRule {
    fn optimize(&mut self, plan: &LogicalPlan) -> Result<LogicalPlan>;
    fn name(&self) -> &str;

    fn optimize_children(&mut self, plan: &LogicalPlan) -> Result<LogicalPlan> { ... }
}

An optimizer rules performs a transformation on a logical plan to produce an optimized logical plan.

Required methods

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

Perform optimizations on the plan

fn name(&self) -> &str

Produce a human readable name for this optimizer rule

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Provided methods

fn optimize_children(&mut self, plan: &LogicalPlan) -> Result<LogicalPlan>

Convenience rule for writing optimizers: recursively invoke optimize on plan's children and then return a node of the same type. Useful for optimizer rules which want to leave the type of plan unchanged but still apply to the children.

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Implementors

impl OptimizerRule for FilterPushDown

fn name(&self) -> &str

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

impl OptimizerRule for HashBuildProbeOrder

fn name(&self) -> &str

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

impl OptimizerRule for ProjectionPushDown

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

fn name(&self) -> &str

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