Struct datafusion_optimizer::push_down_projection::PushDownProjection

pub struct PushDownProjection {}

Optimizer that removes unused projections and aggregations from plans This reduces both scans and

Implementations

impl PushDownProjection

pub fn new() -> Self

Trait Implementations

impl Default for PushDownProjection

fn default() -> PushDownProjection

Returns the “default value” for a type.

impl OptimizerRule for PushDownProjection

fn try_optimize( &self, plan: &LogicalPlan, _config: &dyn OptimizerConfig ) -> Result<Option<LogicalPlan>>

Try and rewrite plan to an optimized form, returning None if the plan cannot be optimized by this rule.

fn name(&self) -> &str

A human readable name for this optimizer rule

fn apply_order(&self) -> Option<ApplyOrder>

How should the rule be applied by the optimizer? See comments on ApplyOrder for details.