code: public void addColumn(String storeName, String rowKey, String columnName, byte[] columnValue) {
          m_columnUpdates.add(new ColumnUpdate(storeName, rowKey, columnName, columnValue));
      }
docs: Add or set a column with the given binary value.
  
  @param storeName Name of store that owns row.
  @param rowKey    Key of row that owns column.
  @param columnName   Name of column.
  @param columnValue  Column value in binary.