BTREE_BACKWARD
if (type == BTREE_BACKWARD && comp < 0)
status = node.SearchSlot(key, &slot, BTREE_BACKWARD);
return _Find(path, key, _value, _size, _offset, BTREE_BACKWARD);
path->Move(level, BTREE_BACKWARD);
return _GetEntry(BTREE_BACKWARD, _value, _size, _offset);