I believe you're looking for what's called, "Matrix Counts"

Please see this JIRA issue. To my knowledge it has been committed in trunk but 
not 3.x.
https://issues.apache.org/jira/browse/SOLR-2898

This feature is accessed by using group.facet=true

Cody

-----Original Message-----
From: danjfoley [mailto:d...@micamedia.com] 
Sent: Saturday, April 07, 2012 7:02 PM
To: solr-user@lucene.apache.org
Subject: Re: To truncate or not to truncate (group.truncate vs. facet)

I've been searching for a solution to my issue, and this seems to come closest 
to it. But not exactly.

I am indexing clothing. Each article of clothing comes in many sizes and 
colors, and can belong to any number of categories.

For example take the following: I add 6 documents to solr as follows:

product, color, size, category

shirt A, red, small, valentines day
shirt A, red, large, valentines day
shirt A, blue, small, valentines day
shirt A, blue, large, valentines day
shirt A, green, small, valentines day
shirt A, green, large, valentines day

I'd like my facet counts to return as follows:

color

red (1)
blue (1)
green (1)

size

small (1)
large (1)

category

valentines day (1)

But they come back like this:

color:
red (2)
blue (2)
green (2)

size:
small (2)
large (2)

category
valentines day (6)

I see the group.facet parameter in version 4.0 does exactly this. However how 
can I make this happen now? There are all sorts of ecommerce systems out there 
that facet exactly how i'm asking. i thought solr is supposed to be the very 
best fastest search system, yet it doesn't seem to be able to facet correct for 
items with multiple values?

Am i indexing my data wrong? 

how can i make this happen?

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