pub trait Metadata {
// Provided method
fn scan_table_meta<'life0, 'async_trait>(
&'life0 self
) -> Pin<Box<dyn Future<Output = Result<Box<dyn Iterator<Item = Result<(String, HashMap<String, Value>), Error>>>, Error>> + 'async_trait>>
where 'life0: 'async_trait,
Self: 'async_trait { ... }
}