@Override
    public int hashCode() {
      HashCodeBuilder hcb = new HashCodeBuilder(9683, 68783);
      return hcb.append(cf).append(cq).append(value).toHashCode();
    }
@return byte [] value for first tuple containing fam and qual or null if no match.
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/AccumuloHiveRow.java