Grokbase Groups Lucene dev July 2010
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Jingkei Ly updated LUCENE-2557:

Attachment: LUCENE-2557.patch

I've had a crack at implementing a fix, based on suggestions in LUCENE-329. It takes the IDF of the term used in the FuzzyQuery if it exists in the index and uses that as the IDF. If the term is not in the index it uses the average IDF of all the terms.

It is implemented as a rewrite method similar to TopTermsBoostOnlyBooleanQueryRewrite from LUCENE-124, although it required modifying TopTermsBooleanQueryRewrite a little bit.
FuzzyQuery - fuzzy terms and misspellings are ranked higher than exact matches

Key: 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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