Alessandro Benedetti created LUCENE-8343:
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Summary: BlendedInfixSuggester bad score calculus for certain
suggestion weights
Key: LUCENE-8343
URL: https://issues.apache.org/jira/browse/LUCENE-8343
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 7.3.1
Reporter: Alessandro Benedetti
Currently the BlendedInfixSuggester return a (long) score to rank the
suggestions.
This score is calculated as a multiplication between :
long *Weight* : the suggestion weight, coming from a document field, it can be
any long value ( including 1, 0,.. )
double *Coefficient* : 0<=x<=1, calculated based on the position match, earlier
the better
The resulting score is a long, which means that at the moment, any weight<10
can bring inconsistencies.
*Edge cases*
Weight =1
Score = 1( if we have a match at the beginning of the suggestion) or 0 ( for
any other match)
Weight =0
Score = 0 ( independently of the position match coefficient)
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