[boost] Relational templates

From: Martin Fuchs (martin-fuchs_at_[hidden])
Date: 2002-06-16 16:03:35

Arkadiy Vertleyb wrote...

> This is a very interesting idea.
>
> However it has a problem within our current implementation, where sort
list
> is defined at compile time (sort list is the second parameter to the tuple
> template).  The sort list defaults to the field list, and this is what you
> are using, so your sort list doesn't really reflect the sorting order.
> Since the sort list is a compile time notion, there is not much we can do
to
> fix it :0(
>
> Not having the proper sort list means your table will not work properly
with
> operators that require sorting, currently union, difference, intersection,
> etc.
>
> Since a few people expressed concern that we do not support indexing, we
are
> going to discuss the issue in the nearest future.  I think your idea may
fit
> very nicely there.  We can see that what you suggested can be implemented
> through indexing (with maybe slightly different interface).

Oh, I see. Currently the operations depend on sorted table content based
on the sort list, defaulting to all columns starting from the left on.
Well, I'm looking forward for your coming indexing implementation.

Martin