Function eval_age_name_with 

pub fn eval_age_name_with(
    expr: &ScalarExpr,
    null_message: &str,
    evaluate: &mut dyn FnMut(&ScalarExpr) -> Result<Value, SQLError>,
) -> Result<String, SQLError>

Evaluate a name/cstring argument of an AGE management function. null_message is the AGE error for a SQL NULL argument.