Function database_span_data 

pub fn database_span_data(
    statement: &str,
    db_system: Option<&str>,
) -> HashMap<String, Value>

The data a database span carries: db.statement and db.system, each left out when blank. Add your own keys and pass it to span or record_span with kind "database" if you prefer; a db.statement on any database span is masked when it’s recorded, however the map was built.