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From "Jack Krupansky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4024) FuzzyQuery should never do edit distance > 2
Date Mon, 07 May 2012 19:20:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269913#comment-13269913
] 

Jack Krupansky commented on LUCENE-4024:
----------------------------------------

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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