Method f_down

datafusion/optimizer/src/optimizer.rs:345–351

(&mut self, node: LogicalPlan)

    type Node = LogicalPlan;

    fn f_down(&mut self, node: LogicalPlan) -> Result<Transformed<LogicalPlan>> {
        if self.apply_order == ApplyOrder::TopDown {
            self.rule.rewrite(node, self.config)
        } else {
            Ok(Transformed::no(node))
        }
    }

    fn f_up(&mut self, node: LogicalPlan) -> Result<Transformed<LogicalPlan>> {
        if self.apply_order == ApplyOrder::BottomUp {