Hey Eran,
I've started work on this in the past - you are right, it gets
complicated quick! Its also likely to bring with it a sizable
performance cost.
We already have an issue in JIRA for this that is quite old:
https://issues.apache.org/jira/browse/LUCENE-533
If you get any work going, don't be shy to start posting code there, and
perhaps you can get some additional eyes/help as you go.
I think in the end, it might have to be an optional mode, if we get the
code produced.
--
- Mark
http://www.lucidimagination.com
Eran Sevi wrote:
Thanks for the answer.
I tried to further understand the weight and score mechanism when running a
span query search.
I noticed that indeed the SpanScorer and SpanWeight are being called and
some score is returned but it seems to me that these basic implementations
are more appropriate for the basic SpanTermQuery.
For the other types of span queries, the inner queries scores and weights
are not taken into account - for example if I run a simple SpanOrQuery and
boost one of it's child SpanTermQuery, the boost is not taken into account.
It seems to me that some recursive calculation is required in order to take
into account all the weights and scores of the span's sub queries.
I'm trying to come up with a correct implementation for SpanOrQuery,
SpanNearQuery, SpanNotQuery based on similiar calculations of BooleanQuery.
Do you have a better idea on how to achieve the correct scoring? the score
calculations are quite complex for each case of span queries so any help is
appreciated.
Thanks, Eran.
On Tue, Aug 4, 2009 at 8:51 PM, Grant Ingersoll <gsing...@apache.org> wrote:
A SpanQuery is a Query, so if you do a search for it, you will get scores.
However, the mechanism is a bit complicated, b/c actually getting the Spans
is separate from doing the query. I agree there could be tighter
integration. However, what you could do is use Spans.skipTo to move to the
document you are examining in the search results.
-Grant
On Aug 2, 2009, at 11:30 AM, Eran Sevi wrote:
Hi,
How can I get the score of a span that is the result of
SpanQuery.getSpans()
? The score should can be the same for each document, but if it's unique
per
span, it's even better.
I tried looking for a way to expose this functionality through the Spans
class but it looks too complicated.
I'm not even sure that by default some score calculation is even performed
when using span queries.
I've noticed that some calculations are made using payloads and
BoostingTermQuery but the score result is used internally and can't be
accessed from the Spans results.
I don't want to re-run the query again using a HitCollector and since the
reader is passed to getSpans, I think it should be possible to do what I
want.
Any help on the correct way to expose the span score will be appreciated.
Thanks,
Eran.
--------------------------
Grant Ingersoll
http://www.lucidimagination.com/
Search the Lucene ecosystem (Lucene/Solr/Nutch/Mahout/Tika/Droids) using
Solr/Lucene:
http://www.lucidimagination.com/search
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