presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/SemiTransactionalHiveMetastore.java/SemiTransactionalHiveMetastore/DirectoryRenameTask
class SemiTransactionalHiveMetastore:        public DirectoryRenameTask(HdfsContext context, Path renameFrom, Path renameTo)
        {
            this.context = requireNonNull(context, "context is null");
            this.renameFrom = requireNonNull(renameFrom, "renameFrom is null");
            this.renameTo = requireNonNull(renameTo, "renameTo is null");
        }