@Override
 public <R> Object[] batchCallback(List<? extends Row> actions, Callback<R> callback)
     throws IOException, InterruptedException {
   return table.batchCallback(actions, callback);
 }
 @Override
 public <R> void batchCallback(
     List<? extends Row> actions, Object[] results, Callback<R> callback)
     throws IOException, InterruptedException {
   table.batchCallback(actions, results, callback);
 }