* @return an iterator over a range of table rows, determined by a
* sorted bounded range of a data field
*/
public IntIterator rangeSortedBy(String field, int lo, int hi, int indexType) {
Index index = getIndex(field, int.class, true);
return index.rows(lo, hi, indexType);
}
/**
* Return an iterator over a range of rwos in this table, determined
* by a bounded range for a given data field. A new index over the