Method expect_config_value

src/sql/src/session/vars.rs:1392–1402

(&self, name: &UncasedStr)

    }

    fn expect_config_value<V: ConfigType + 'static>(&self, name: &UncasedStr) -> &V {
        let val = self
            .vars
            .get(name)
            .unwrap_or_else(|| panic!("provided var {name} should be in state"));

        val.value_dyn()
            .as_any()
            .downcast_ref()
            .expect("provided var type should matched stored var")
    }

    /// Reset all the values to their defaults (preserving
    /// defaults from `VarMut::set_default).