Faceting on a "facet_fields" field will only have a handful (most
likely) or less values so you'd be able to have that particular
faceting cached to use quickly. I'm not sure how much memory it'd
take up, but certainly not as much as actually faceting on the fields
themselves.
However, another approach you could take is to use facet.query.
facet.query=some_facet_field:[* TO *] will return back a non-zero
number if there are any documents in the results that have
some_facet_field with a value. You'd of course need to add a separate
facet.query parameter for each field you cared about.
Erik
On Mar 30, 2010, at 10:45 AM, Gregor Kaczor wrote:
I am not sure if i got your approach right. If i did not, please
explain where the advantages are in time and memory footprint.
In my opinion faceting on facet field names does not avoid counting
facets. If my result set is huge so will be the facet numbers on on
the field of facet names. It does not seem to me like saving memory
and time.
My idea is to stop counting facets after finding one. It would show
that for a certain query there are some categories available. My aim
is to keep the memory footprint low while still beeing able to facet
>10^7 of documents. A problem i am dealing with right now.
-------- Original-Nachricht --------
Datum: Tue, 30 Mar 2010 08:46:23 -0400
Von: Erik Hatcher <erik.hatc...@gmail.com>
An: java-dev@lucene.apache.org
Betreff: Re: new facet parameter: facet.exists=true
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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