presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/file/PermissionMetadata.java/PermissionMetadata/toHivePrivilegeInfo
class PermissionMetadata:    public HivePrivilegeInfo toHivePrivilegeInfo()
    {
        return new HivePrivilegeInfo(permission, grantOption, new HivePrincipal(USER, "admin"), grantee);
    }