@Override
  public String toString() {
    StringBuilder builder = new StringBuilder("AccumuloHiveRow{");
    builder.append("rowId='").append(rowId).append("', tuples: ");
    for (ColumnTuple tuple : tuples) {
      builder.append(tuple.toString());
      builder.append("\n");
    }
    return builder.toString();
  }
@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