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https://issues.apache.org/jira/browse/LUCENE-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269913#comment-13269913
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Jack Krupansky commented on LUCENE-4024:
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bq. The levenshtein distance has changed to include transposition as a
primitive edit
Is there any user-visible doc about that change? I don't see any mention in
CHANGES.txt or the Javadoc for FuzzyQuery.
At least according to the Wikipedia, the addition of transposition as a
primitive would be referred to as the "Damerau–Levenshtein distance".
http://en.wikipedia.org/wiki/Levenshtein_distance
http://en.wikipedia.org/wiki/Damerau%E2%80%93Levenshtein_distance
At least the Javadoc for FuzzyQuery should have a link to whatever the
technically correct specification is.
A few examples would be nice as well.
> FuzzyQuery should never do edit distance > 2
> --------------------------------------------
>
> Key: LUCENE-4024
> URL: https://issues.apache.org/jira/browse/LUCENE-4024
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-4024.patch
>
>
> Edit distance 1 and 2 are now very very fast compared to 3.x (100X-200X
> faster) ... but edit distance 3 will fallback to the super-slow scan all
> terms in 3.x, which is not graceful degradation.
> Not sure how to fix it ... mabye we have a SlowFuzzyQuery? And FuzzyQuery
> throws exc if you try to ask it to be slow? Or, we add boolean (off by
> default) that you must turn on to allow slow one..?
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