@Override
	DBFieldIterator keyIterator(Field minField, Field maxField, Field startField, boolean before)
			throws IOException {
		return new PrimaryKeyIterator(minField, maxField, startField,
			before ? getPrimaryTableKeyType().getMinValue()
					: getPrimaryTableKeyType().getMaxValue(),
			!before);
	}
Delete all primary records which have the current
index value (lastKey).
@see db.DBFieldIterator#delete()
Ghidra/Framework/DB/src/main/java/db/FieldIndexTable.java