From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
---|---|
To: | Michael Fuhr <mike(at)fuhr(dot)org> |
Cc: | Humberto Luiz Razente <hlr(at)icmc(dot)usp(dot)br>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: Getting relation/attribute names from inside UDT input/output function |
Date: | 2006-05-11 07:22:31 |
Message-ID: | 20060511072231.GB30113@svana.org |
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Lists: | pgsql-general |
On Wed, May 10, 2006 at 09:12:33PM -0600, Michael Fuhr wrote:
> On Wed, May 10, 2006 at 02:50:26PM -0300, Humberto Luiz Razente wrote:
> > I'm trying to index data characteristics extracted from multimedia
> > files (like a color distribution histogram from an image), in
> > order to make k-nearest neighbor queries (similarity-based queries).
> > The problem is that I can have a variable number of characteristics (its
> > called adimensional features), so I cannot index with R-tree
> > like GIST. I already have the tree implemented in C, so I would
> > like to build a tree for each complex type in each
> > attribute/relation. Am I going in the wrong direction?
>
> I'm not familiar with the problem domain but maybe somebody else
> on the mailing list is. Could you explain a bit more, perhaps with
> an example showing how you're currently using the type and what
> you'd like to be able to do with it (e.g., a hypothetical table,
> data set, query, and query result)?
I'm not entirely sure, but this seems a similar issue to what tsearch
had (indexing documents). CVS HEAD has a new index type called GIN
(Generalised Inverted Index) which may be closer to your needs.
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.
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