presto-spi/src/main/java/io/prestosql/spi/connector/classloader/ClassLoaderSafeConnectorMetadata.java/ClassLoaderSafeConnectorMetadata/listRoles
class ClassLoaderSafeConnectorMetadata:    @Override
    public Set<String> listRoles(ConnectorSession session)
    {
        try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(classLoader)) {
            return delegate.listRoles(session);
        }
    }