Method projection

datafusion/sql/src/unparser/ast.rs:219–222

(&mut self, value: Vec<ast::SelectItem>)

        self
    }
    pub fn projection(&mut self, value: Vec<ast::SelectItem>) -> &mut Self {
        self.projection = Some(value);
        self
    }
    pub fn pop_projections(&mut self) -> Vec<ast::SelectItem> {
        self.projection.take().unwrap_or_default()
    }