code: @Override
    public <SN,N,V> Mutator<K> addInsertion(K key, String cf, HSuperColumn<SN,N,V> sc) {
      getPendingMutations().addSuperInsertion(key, Arrays.asList(cf),
          ((HSuperColumnImpl<SN,N,V>) sc).toThrift());
      return this;
    }
docs: Schedule an insertion of a supercolumn to be inserted in batch mode by {@link #execute()}