public DBFieldIterator fieldKeyIterator(Field minKey, Field maxKey, Field startKey)
			throws IOException {
		synchronized (db) {
			if (schema.useLongKeyNodes()) {
				throw new AssertException();
			}
			return new FieldKeyIterator(minKey, maxKey, startKey);
		}
	}
Iterate over the records in ascending sorted order
starting at the specified startKey.
@param minKey minimum key value.  Null corresponds to minimum key value.
@param maxKey maximum key value.  Null corresponds to maximum key value.
@param startKey the initial iterator position.  If null minKey will be assumed,
if still null the minimum key value will be assumed.
@return Field type key iterator
@throws IOException if an I/O error occurs.
Ghidra/Framework/DB/src/main/java/db/Table.java