[Qgis-developer] QEP/RFC sqlite virtual tables

[Vincent Picavet]

Hello,

Le mercredi 29 octobre 2014 08:34:11, Matthias Kuhn a écrit :
[...]
> > limitations. Only power users knowing what is really happening underneath
> > will know what function to use, which is bad in UX terms.
> > A comparison is OGR CSV driver versus CSV plugin... User has to know that
> > both tools are differents, behaves differently with a different
> > providers. Nothing in the GUI let you know that except try-fail
> > approach.
> 
> The problem is that we have one proposal which can be available soon
> with lots of functionality and a not-too-hard implementation. But we/I
> lack knowledge if it performs well in every scenario and if it offers
> the possibility to optimize.

The thing is, we cannot forecast everything, and without a working prototype, 
we will probably never be able to determine the behaviour for every scenario, 
as we probably cannot imagine every scenario at all.

"Premature optimization is the root of all evil."

At some point we need some working code to be able to start iterating over 
something real, more than trying to imagine a perfect plan and see nothing 
coming at the end.

QEP are there to make sure the global orientation and design is good and is 
coherent with the rest of the project. They cannot be fully exhaustive, and 
there will probably be other QEP regarding this feature set to enhance and fix 
the first implementation. 
We could even go back if this approach proves to fail. Failure is progress 
too.

Vincent

> 
> > BTW, I have the feeling you don't disagree at all but that we are digging
> > one of the harder features of a GIS tool. IMHO, that really desserves
> > discussions, prooves of concept.  Any other opinions in dev's?
> 
> I also don't think it's disagreement, it's evaluation of risks/chances
> involved by either of the two.
> 
> Best
> Matthias