@Override
  public String toString() {
    return "[" + this.getClass().getSimpleName() + ": " + columnFamily + ":" + columnQualifier
        + ", encoding " + encoding + "]";
  }
Cached bytes for the columnQualifier. Modifications to the bytes will affect those stored in
this ColumnMapping -- such modifications are highly recommended against.

@return UTF8 formatted bytes
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/columns/HiveAccumuloColumnMapping.java