proxy lazy resolve progress

include/matador/sql/statement.hpp

@@ -152,10 +152,6 @@ utils::result<query_result<Type>, utils::error> statement::fetch() {
   return statement_proxy_->fetch(*bindings_).and_then([](std::unique_ptr<query_result_impl> &&value) {
     return utils::ok(query_result<Type>(std::forward<decltype(value)>(value)));
   });
-//  if (!result.is_ok()) {
-//    return utils::error(result.err());
-//  }
-//  return query_result<Type>(result.release());
 }
 
 template<class Type>