[elephant-devel] Fwd: some patches

[Ian Eslick]

Robert and I have had some extended discussions on ordering in  
indices.  I think that all we really need to agree on is _some_  
canonical ordering.  If we have mixed types in an index, how should  
they be ordered relative to each other?  In BDB we have a C function  
which implements the ordering based on the type tag and then based on  
the type within it.  Are you relying on a pure binary sort in  
postmodern?

Robert or I will get to submitting that patch shortly.  I have  
recently sent in a patch to lisp-compare<= so we'll see if we had to  
make parallel changes.


Thanks,
Ian

On Jul 24, 2007, at 3:50 AM, Henrik Hjelte wrote:

> I sent this message yesterday but I guess it got stuck in the mailing
> list filter. Perhaps the attachment was too big. Since my
> common-lisp.net user hhjelte does not have write access to elephant I
> have placed the patches from here instead:
> darcs get http://common-lisp.net/project/grand-prix/darcs/elephant
>
> ---------- Forwarded message ----------
> From: Henrik Hjelte <henrik at evahjelte.com>
> Date: Jul 23, 2007 11:28 PM
> Subject: some patches
> To: elephant-devel at common-lisp.net
>
>
> Here are some darcs patches that might be of interest. I had some
> problems with map-index on db-postmodern that made me almost rip my
> hair of, but finally I made it to work again. The problem is that
> map-index for a string value rely on the ordering in the btree
> (continue-p makes use of less than for strings). The postmodern
> backend relies on how the database backend orders things, which is not
> always the same thing. Is it a necessary feature that b-trees of
> string and objects are required to be ordered by lisp-compare<=?
>
> In the process of solving the bug I have upgraded the test framework
> to use FiveAM instead of RT, It has in my opinion a very nice syntax
> and some useful features to track dependencies between tests. I hope
> you agree that it improves on things.
>
> /Henrik Hjelte
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