On Feb 9, 2007, at 7:07 AM, Kainth, Sachin wrote:
But does that not imply that a second search is made against the index
by the line:
BitSet all = (new QueryFilter(q)).bits(reader)
Yeah, if you want to return facet counts and results in the same
sweep, yes. If all you want are the counts, only one query is needed.
Caching is key. Solr - See the Light!
Erik
-----Original Message-----
From: Kainth, Sachin [mailto:[EMAIL PROTECTED]
Sent: 09 February 2007 12:05
To: java-user@lucene.apache.org
Subject: RE: categorisation
Ahhh it all makes sense to me now :-)
-----Original Message-----
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: 09 February 2007 12:01
To: java-user@lucene.apache.org
Subject: Re: categorisation
On Feb 9, 2007, at 5:40 AM, Kainth, Sachin wrote:
It makes sense to me only if you tell me that all the bits in the
BitSet "all" will be 1.
well, ok, so the "all" may be misleading. call it queryBits instead
then :)
"all" means *all documents that match the query*, though.
it wouldn't make sense to AND a bitset with one that is all 1's
always.
Erik
-----Original Message-----
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: 08 February 2007 18:37
To: java-user@lucene.apache.org
Subject: Re: categorisation
On Feb 8, 2007, at 12:36 PM, Kainth, Sachin wrote:
Chris has given an example of how to perform categorisation of
lucene
searches:
String[] mfgs = ...;
String query = "+category:cameras +price:[0 to 10]";
Query q = QueryParser.parse(query);
Hits results = searcher.search(q, mySort)
BitSet all = (new QueryFilter(q)).bits(reader)
int[] mfg_counts = new int[mfgs.length];
for i in (0 to mfgs.length) {
BitSet these = (new QueryFilter(new TermQuery("mfg",mfgs
[i]))).bits(reader);
these.and(all)
mfg_counts[i] = these.cardinality();
}
What I don't understand though is what this line does:
BitSet all = (new QueryFilter(q)).bits(reader)
Anyone have any ideas?
"all" is a BitSet lit up for the documents that matched "query".
"these" (the BitSet for a particular category) is .anded with "all"
to get the counts _left over_ for each category given "query".
Make sense?
Erik
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