[tarantool-patches] Re: [PATCH] box: add tuple:size function

[Vladimir Davydov]

On Sat, Oct 06, 2018 at 04:58:46PM +0300, Vladislav Shpilevoy wrote:
> 
> 
> On 05/10/2018 13:23, Vladimir Davydov wrote:
> > On Thu, Sep 27, 2018 at 08:55:23PM +0300, AlexeyIvushkin wrote:
> > > diff --git a/src/box/lua/tuple.lua b/src/box/lua/tuple.lua
> > > index 63ea73e..801ee3c 100644
> > > --- a/src/box/lua/tuple.lua
> > > +++ b/src/box/lua/tuple.lua
> > > @@ -286,6 +286,7 @@ local methods = {
> > >       ["update"]      = tuple_update;
> > >       ["upsert"]      = tuple_upsert;
> > >       ["bsize"]       = tuple_bsize;
> > > +    ["size"]        = internal.tuple.size;
> > >       ["tomap"]       = internal.tuple.tuple_to_map;
> > 
> > Why did you decide to introduce a new function rather than fixing
> > tuple.bsize, as it was explicitly requested in the ticket?
> 
> It breaks compatibility. Now bsize returns only Message Pack part
> of tuple despite what the documentation says.

Frankly, I don't think that introducing a new method just to keep the
old behavior of bsize intact is a good idea, because we probably won't
stop at that. The next thing we have to add will probably be space.size,
which would be defined as a sum of tuple.size of constituent tuples and
that wouldn't be as trivial to implement as tuple.size...

Anyway, IMO having two methods for getting the size of binary data
stored in a tuple is confusing (which one should I use as a user?).
Up to Kostja.