[ https://issues.apache.org/jira/browse/LUCENE-329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler resolved LUCENE-329. ---------------------------------- Resolution: Fixed Fix Version/s: 4.0 3.1 Recent 3.x versions contain a new FuzzyQuery rewrite method (MultiTermQuery.TopTermsBoostOnlyBooleanQueryRewrite) that uses a BooleanQuery with clauses of ConstantScoreQuery(TermQuery) usig the fuzzy boost. So term's idf is not used at all. This should solve this problem. > Fuzzy query scoring issues > -------------------------- > > Key: LUCENE-329 > URL: https://issues.apache.org/jira/browse/LUCENE-329 > Project: Lucene - Java > Issue Type: Bug > Components: Search > Affects Versions: 1.2rc5 > Environment: Operating System: All > Platform: All > Reporter: Mark Harwood > Priority: Minor > Fix For: 3.1, 4.0 > > Attachments: patch.txt > > > Queries which automatically produce multiple terms (wildcard, range, prefix, > fuzzy etc)currently suffer from two problems: > 1) Scores for matching documents are significantly smaller than term queries > because of the volume of terms introduced (A match on query Foo~ is 0.1 > whereas a match on query Foo is 1). > 2) The rarer forms of expanded terms are favoured over those of more common > forms because of the IDF. When using Fuzzy queries for example, rare mis- > spellings typically appear in results before the more common correct > spellings. > I will attach a patch that corrects the issues identified above by > 1) Overriding Similarity.coord to counteract the downplaying of scores > introduced by expanding terms. > 2) Taking the IDF factor of the most common form of expanded terms as the > basis of scoring all other expanded terms. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org