code: public BatchMutation<K> addInsertion(K key, List<String> columnFamilies,
        Column column) {
      Mutation mutation = new Mutation();
      mutation.setColumn_or_supercolumn(new ColumnOrSuperColumn().setColumn(column));
      addMutation(key, columnFamilies, mutation);
      return this;
    }
docs: Add an Column insertion (or update) to the batch mutation request.