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From Erik Hatcher <>
Subject Re: new facet parameter: facet.exists=true
Date Tue, 30 Mar 2010 12:46:23 GMT
One trick to doing this is to index a field that lists the facet field  
names that each document possesses.  Then you can facet on the field  
of field names (sounds confusing, sorry) and you'll know if there are  
any documents in a result set that have values in, say, a "category"  

There's actually a basic patch out there that'll do this  
automatically:  - it  
needs a bit of polish, but that's the general idea.


On Mar 30, 2010, at 7:46 AM, Gregor Kaczor wrote:

> Facetting in indexes with document volumes exceeding twenty million  
> documents is a time and particularly memory consuming search.
> In such huge indexes i am not interested if there is 4 or 5 million  
> documents of a special type, i just want to know there are some and  
> if i choose that facet will i get a list of results.
> Such an option would just count the first occurance of a facet term  
> and return it without doing much of computation.
> I cound not figure out how to get that behaviour with existing  
> facetting parameters.
> What do you think?
> Gregor Kaczor
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