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-----Original Message----- From: Noel Frankinet [mailto:[EMAIL PROTECTED] Sent: Monday, May 29, 2006 9:23 AM To: [email protected] Subject: Re: [sqlite] SQLite as R data store and spatial data maybe ? [EMAIL PROTECTED] wrote: >Noel Frankinet <[EMAIL PROTECTED]> wrote: > > >>>You might want to take a look at DRH's proposal, >>>http://www.sqlite.org/cvstrac/wiki?p=VirtualTables >>>which looks like it would make it easier for the R community to >>>implement the sort of interface you're talking about. >>> >>> >>I've read the proposed virtualTable schema. >>Mr Hipp could you elaborate on how you envision spatial indexing ? >> >> > >I've not thought about it. The VirtualTable proposal was >developped to support full-text search and as something to >replace the (goofy) pragmas currently used to find schema >information. I would imagine that virtualtables would also >be useful for spatial indexing, but I have not looked closely >into the matter. >-- >D. Richard Hipp <[EMAIL PROTECTED]> > > > > > Thank you for your reply, I suppose that whatever indexing technique, it boils down to " I have that bunch of keys please return the corresponding records". I can then use IN or BETWEEN statement, but I suspect that a UNION between a TABLE(query_quadtree(interesting_window)) (is this a virtual table?) and my target table would do better. Am I right ? maybe a little bit confused ? Best regards -- Noël Frankinet Gistek Software SA http://www.gistek.net
