Method project_window_output

datafusion/sql/src/unparser/plan.rs:481–511

(
        &self,
        window_expr: &[Expr],
        select: &mut SelectBuilder,
        agg: Option<&Aggregate>,
    )

    }

    fn project_window_output(
        &self,
        window_expr: &[Expr],
        select: &mut SelectBuilder,
        agg: Option<&Aggregate>,
    ) -> Result<()> {
        let mut items = if select.already_projected() {
            select.pop_projections()
        } else {
            vec![ast::SelectItem::Wildcard(
                ast::WildcardAdditionalOptions::default(),
            )]
        };

        items.extend(
            window_expr
                .iter()
                .map(|expr| {
                    let expr = if let Some(agg) = agg {
                        unproject_agg_exprs(expr.clone(), agg, None)?
                    } else {
                        expr.clone()
                    };
                    self.select_item_to_sql(&expr)
                })
                .collect::<Result<Vec<_>>>()?,
        );
        select.projection(items);

        Ok(())
    }

    fn window_input_requires_derived_subquery(plan: &LogicalPlan) -> bool {
        // These operators either produce a SELECT list or apply SQL clauses