@Override
  public String toString() {
    return "[" + this.getClass().getSimpleName() + ", " + this.mappingSpec + ", encoding "
        + encoding + "]";
  }
{@link ColumnMapping} which corresponds to the Hive column which should be used as the rowID in a
{@link Mutation}
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/columns/HiveAccumuloRowIdColumnMapping.java