presto-spi/src/main/java/io/prestosql/spi/connector/classloader/ClassLoaderSafeConnectorMetadata.java/ClassLoaderSafeConnectorMetadata/grantRoles
class ClassLoaderSafeConnectorMetadata:    @Override
    public void grantRoles(ConnectorSession connectorSession, Set<String> roles, Set<PrestoPrincipal> grantees, boolean withAdminOption, Optional<PrestoPrincipal> grantor)
    {
        try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(classLoader)) {
            delegate.grantRoles(connectorSession, roles, grantees, withAdminOption, grantor);
        }
    }