Method some

datafusion/common/src/config.rs:1591–1593

(&mut self, key: &str, _: V, _: &'static str)

        impl Visit for Visitor {
            fn some<V: Display>(&mut self, key: &str, _: V, _: &'static str) {
                self.0.push(key.to_string())
            }

            fn none(&mut self, key: &str, _: &'static str) {
                self.0.push(key.to_string())