On May 15, 2006, at 5:07 PM, Marvin Humphrey wrote:
If you needed to know not just the total number of hits, but the
number of hits in each "category", how would you handle that?
For instance, a search for "egg" would have to produce the 20 most
relevant documents for "egg", but also a list like this:
Holiday & Seasonal / Easter 75
Books / Cooking 52
Miscellaneous 44
Kitchen Collectibles 43
Hobbies / Crafts 17
[...]
It seems to me that you'd have to retrieve each hit's stored fields
and examine the contents of a "category" field. That's a lot of
overhead. Is there another way?
My first implementation of faceted browsing uses BitSet's that get
pre-loaded for each category value (each unique term in a "category"
field, for example). And to intersect that with an actual Query, it
gets run through the QueryFilter to get its BitSet and then AND'd
together with each of the category BitSet's. Sounds like a lot, but
for my applications there are not tons of these BitSet's and the
performance has been outstanding. Now that I'm doing more with Solr,
I'm beginning to leverage its amazing caching infrastructure and
replacing BitSet's with DocSet's.
Erik
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