Struct datafusion::optimizer::filter_push_down::FilterPushDown

pub struct FilterPushDown {}

Filter Push Down optimizer rule pushes filter clauses down the plan

This optimization looks for the maximum depth of each column in the plan where a filter can be applied and re-writes the plan with filters on those locations. It performs two passes on the plan:

1. identify filters, which columns they use, and projections along the path
2. move filters down, re-writing the expressions using the projections

Implementations

impl FilterPushDown

pub fn new() -> Self

Trait Implementations

impl OptimizerRule for FilterPushDown

fn name(&self) -> &str

Produce a human readable name for this optimizer rule

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

Perform optimizations on the plan

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.