Compressed BitSet

[Dupriez Christophe <ch...@yahoo.fr>]

I am about to evaluate Lucene for replacing
current IR system of Belgian Poison Center.
 
We are used to manage query refinements by
combining different searches with boolean
operators: we thus have to store the results
(or otherwise to remake them). Our current
software does this by paging compressed bit
sets on disk. I did not saw (up to now)
an object like Compressed BitSets in Lucene.
 
Browsing the web, I found a very interesting
class, near of what we currently use:
http://www.iis.uni-stuttgart.de/intset/
 
What Lucene's developpers think
about this issue ?
 
Thank you very much for your advice !

Christophe Dupriez
dupriez@destin.be




	

	
		
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Re: Compressed BitSet

[Paul Elschot <pa...@xs4all.nl>]

On Thursday 09 March 2006 14:25, eks dev wrote:
...
> 
> PS1: If you are interested in compressed bit sets, try
> to search for "utilities for compact sparse filters
> lucene"

Or look here:

http://issues.apache.org/jira/browse/LUCENE-328

Regards,
Paul Elschot


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Re: Compressed BitSet

[eks dev <ek...@yahoo.co.uk>]

Just a short one, it rocks in some cases (when actual
BitSet/IntSet is compressable, long runs of set or
clear bits...). Very good general BitSet
representation

I have tried it and found no bugs so far (+- 2 months
of using it)

Unfortunately, there is an issue with Licence (not ASF
compatible :(

cheers

PS:
To use something like that with Lucene you will hit
the problem with Filter interface that suports only
BitSet. It means you will have to wait a bit until
more flexible Filter interface gets accepted by the
comunity. Apart from that, I would not evaluate too
much, just take Lucene, it is briliant ;)

PS1: If you are interested in compressed bit sets, try
to search for "utilities for compact sparse filters
lucene"


--- Dupriez Christophe <ch...@yahoo.fr>
wrote:

> I am about to evaluate Lucene for replacing
> current IR system of Belgian Poison Center.
>  
> We are used to manage query refinements by
> combining different searches with boolean
> operators: we thus have to store the results
> (or otherwise to remake them). Our current
> software does this by paging compressed bit
> sets on disk. I did not saw (up to now)
> an object like Compressed BitSets in Lucene.
>  
> Browsing the web, I found a very interesting
> class, near of what we currently use:
> http://www.iis.uni-stuttgart.de/intset/
>  
> What Lucene's developpers think
> about this issue ?
>  
> Thank you very much for your advice !
> 
> Christophe Dupriez
> dupriez@destin.be
> 
> 
> 
> 
> 	
> 
> 	
> 		
>
___________________________________________________________________________
> 
> Nouveau : téléphonez moins cher avec Yahoo!
> Messenger ! Découvez les tarifs exceptionnels pour
> appeler la France et l'international.
> Téléchargez sur http://fr.messenger.yahoo.com
> 
>
---------------------------------------------------------------------
> To unsubscribe, e-mail:
> java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail:
> java-user-help@lucene.apache.org
> 
> 



		
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