Chris Hostetter wrote:
1) you can never compare the score from a Hits object with the score from
an Explanation. Explanation has the raw score, Hits has the
psuedo-normalized score.
Thanks for the comments. Where I was trying to get to was whether a match on a
field with boost of 0.0 can ever cause the normalised score to result in 0 if
there is also a match on a field with a non zero boost. I'm not sure I
understand the scoring formula :(
I've played a bit more and found:
If I search for a document where the field boost is 0.0 then the document is not
found I just search that field. Is this expected???
I have a configurable framework, where the field schema can have the boost set
and I am trying to understand whether to allow >=0.0 of just >0.0 and how Lucene
behaves with 0.0.
I know a Filter would be better to remove a field's influence on score
during search, but I'd like to understand...
2) Explanation was notoriously kludgy and buggy when dealing with "non
matches" or BooleanQueries that had prohibited clauses, or clauses
which scored <= 0 prior to the resolution of LUCENE-451, LUCENE-557, and
LUCENE-605. Regretably these changes are "post 2.0" so you'd have to use
the head to try them out.
OK, I hope to get to 2.1, which I'm eagerly awaiting, so will revisit
explanations then.
Antony
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