Method f_down

datafusion/expr/src/logical_plan/display.rs:65–80

(
        &mut self,
        plan: &'n LogicalPlan,
    )

    type Node = LogicalPlan;

    fn f_down(
        &mut self,
        plan: &'n LogicalPlan,
    ) -> datafusion_common::Result<TreeNodeRecursion> {
        if self.indent > 0 {
            writeln!(self.f)?;
        }
        write!(self.f, "{:indent$}", "", indent = self.indent * 2)?;
        write!(self.f, "{}", plan.display())?;
        if self.with_schema {
            write!(self.f, " {}", display_schema(plan.schema().as_arrow()))?;
        }

        self.indent += 1;
        Ok(TreeNodeRecursion::Continue)
    }

    fn f_up(
        &mut self,