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Re:Things you shouldn't do: Two pointers in one field. by lsb on Monday May 17, 2010 @12:12AM (#1353531)
The name of it was on the tip of my tongue as I read your description, so I googled for "probabilistic constant-space test for membership", and voila, first result.
Re:Things you shouldn't do: Two pointers in one field. by jacquesm on Monday May 17, 2010 @12:16AM (#1353542)
I bow to your google fu, that would have taken me a week.

At least.

If I would have found it at all. This is one of those areas where I think I can really feel that having English as a first language - or at least a degree in computer science - would have helped tremendously, just knowing the right terminology can be such a huge advantage.

I can parse your description of it but I could never come up with it in those terms. I'd be looking for "compressed index" or "candidate records algorithm" or something like that.