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From ai114 <gabriel.wels...@googlemail.com>
Subject Re: is OpenBitSet / SortedVIntList compressed bit map index?
Date Wed, 25 May 2011 11:07:29 GMT

First Last wrote:
> 
> Are there any other compressed bitmap index implementations which offer
> bit
> map compression at a decent performance assuming filters are sparse?
> 

Have a look at  EWAH by Daniel Lemire
google: http://code.google.com/p/javaewah/
http://code.google.com/p/javaewah/ 
research paper:  http://arxiv.org/abs/0901.3751
http://arxiv.org/abs/0901.3751 
code:  https://github.com/lemire/javaewah/tree/
https://github.com/lemire/javaewah/tree/ 

Gabriel

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