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https://issues.apache.org/jira/browse/LUCENE-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269941#comment-13269941
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Robert Muir commented on LUCENE-4024:
-------------------------------------
Did you look at mmmm say the changes to FuzzyQuery.java? package.html?
{noformat}
/** Implements the fuzzy search query. The similarity measurement
- * is based on the Levenshtein (edit distance) algorithm.
+ * is based on the Damerau-Levenshtein (optimal string alignment) algorithm.
*
{noformat}
{noformat}
+ * @param transpositions true if transpositions should be treated as a
primitive
+ * edit operation. If this is false, comparisons will implement the
classic
+ * Levenshtein algorithm.
{noformat}
{noformat}
-<p>Lucene supports fuzzy searches based on the Levenshtein Distance, or Edit
Distance algorithm.
+<p>Lucene supports fuzzy searches based on Damerau-Levenshtein Distance.
{noformat}
> 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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