Method convert_bound

datafusion/sql/src/unparser/expr.rs:871–908

(
        &self,
        bound: &datafusion_expr::window_frame::WindowFrameBound,
    )

    }

    fn convert_bound(
        &self,
        bound: &datafusion_expr::window_frame::WindowFrameBound,
    ) -> Result<ast::WindowFrameBound> {
        match bound {
            datafusion_expr::window_frame::WindowFrameBound::Preceding(val) => {
                Ok(ast::WindowFrameBound::Preceding({
                    let val = self.scalar_to_sql(val)?;
                    if let ast::Expr::Value(ValueWithSpan {
                        value: ast::Value::Null,
                        span: _,
                    }) = &val
                    {
                        None
                    } else {
                        Some(Box::new(val))
                    }
                }))
            }
            datafusion_expr::window_frame::WindowFrameBound::Following(val) => {
                Ok(ast::WindowFrameBound::Following({
                    let val = self.scalar_to_sql(val)?;
                    if let ast::Expr::Value(ValueWithSpan {
                        value: ast::Value::Null,
                        span: _,
                    }) = &val
                    {
                        None
                    } else {
                        Some(Box::new(val))
                    }
                }))
            }
            datafusion_expr::window_frame::WindowFrameBound::CurrentRow => {
                Ok(ast::WindowFrameBound::CurrentRow)
            }
        }
    }

    pub(crate) fn function_args_to_sql(
        &self,