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"
field.
There's actually a basic patch out there that'll do this
automatically: https://issues.apache.org/jira/browse/SOLR-1280 - it
needs a bit of polish, but that's the general idea.
Erik
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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