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From Simon Willnauer <simon.willna...@googlemail.com>
Subject Re: Wilcard document matches all have the same score
Date Fri, 24 Jun 2011 05:22:51 GMT
On Fri, Jun 24, 2011 at 3:08 AM, SBS <jturnbul@uow.edu.au> wrote:
> I am new to Lucene 3.2 and have it working well in most cases.  However, when
> I do wildcard searches such as abc*, all the resulting matched documents
> have exactly the same score regardless of the words that matched, their
> position within the document or the size of the document.  This makes
> presenting them in some meaningful order on the screen very difficult.
>
> Is this the expected behaviour or have I done something wrong with my
> indexing or searching technique?  Searches not involving wildcards produce a
> range of scores as expected.
>
that is expected behavior. WildcardQuery is a MultiTermQuery and for
MTQ you can / have to specify a RewriteMethod that decides what kind
of primitive query is used to execute the MTQ. if you want to use
scoring you can pass MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE to
your WildcardQuery when you create it via
WildcardQuery#setRewriteMethod(...); Yet, make sure you expect a
TooManyBooleanClauses exception if your WildcardQuery expands to too
many terms. Something like a* is not a good idea :).

simon
> Thanks,
>
> -sbs
>
> --
> View this message in context: http://lucene.472066.n3.nabble.com/Wilcard-document-matches-all-have-the-same-score-tp3102450p3102450.html
> Sent from the Lucene - General mailing list archive at Nabble.com.
>

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