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https://issues.apache.org/jira/browse/LUCENE-2557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892341#action_12892341
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Eks Dev commented on LUCENE-2557:
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It looks like we have one invariant:
IDF(QueryTerm) >= IDF(Expansion Term) // Preventing better scoring documents
with ET then Documents with exact match on QT.
Fixing all expansions to IDF(QT) would remove dynamics of the score, making the
contribution to the score for all expansions identical. Maybe proportionally
scaling IDF of all expansions to preserve mutual IDF dynamics, (relative to
IDF(QT) to keep-up with invariant) would work better?
In case when there is no matching QueryTerm, why not simply preserving
expansion Term IDF, what is averaging good for, performance?
> FuzzyQuery - fuzzy terms and misspellings are ranked higher than exact matches
> ------------------------------------------------------------------------------
>
> Key: LUCENE-2557
> URL: https://issues.apache.org/jira/browse/LUCENE-2557
> Project: Lucene - Java
> Issue Type: Bug
> Components: Query/Scoring
> Affects Versions: 3.0.2
> Reporter: Jingkei Ly
> Attachments: idf-scoring-test-case.patch, LUCENE-2557.patch
>
>
> The FuzzyQuery often causes misspellings to be ranked higher than the exact
> match, which seems to be an undesirable property generally.
> For example, in an index of surnames, if I search using a FuzzyQuery for
> "smith", the misspellings such as "smiith", or "smiht" would appear near the
> top of the search results ahead of documents that match "smith".
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