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https://issues.apache.org/jira/browse/LUCENE-5030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13690102#comment-13690102
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Artem Lukanin commented on LUCENE-5030:
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I'm uploading 3 results of benchmarking:
1) benchmark-old.txt - before the patch
2) benchmark-INFO_SEP.txt - after the patch
3) benchmark-wo_convertion.txt - after the patch, but with commented lines
{code} //Automaton utf8lookupAutomaton = new
UTF32ToUTF8().convert(lookupAutomaton);
//BasicOperations.determinize(utf8lookupAutomaton);{code}
because they are useless for words consisting only latin letters.
As you can see the conversion takes too much time.
> FuzzySuggester has to operate FSTs of Unicode-letters, not UTF-8, to work
> correctly for 1-byte (like English) and multi-byte (non-Latin) letters
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-5030
> URL: https://issues.apache.org/jira/browse/LUCENE-5030
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.3
> Reporter: Artem Lukanin
> Attachments: benchmark-INFO_SEP.txt, benchmark-old.txt,
> benchmark-wo_convertion.txt, nonlatin_fuzzySuggester1.patch,
> nonlatin_fuzzySuggester2.patch, nonlatin_fuzzySuggester3.patch,
> nonlatin_fuzzySuggester4.patch, nonlatin_fuzzySuggester.patch,
> nonlatin_fuzzySuggester.patch, nonlatin_fuzzySuggester.patch,
> run-suggest-benchmark.patch
>
>
> There is a limitation in the current FuzzySuggester implementation: it
> computes edits in UTF-8 space instead of Unicode character (code point)
> space.
> This should be fixable: we'd need to fix TokenStreamToAutomaton to work in
> Unicode character space, then fix FuzzySuggester to do the same steps that
> FuzzyQuery does: do the LevN expansion in Unicode character space, then
> convert that automaton to UTF-8, then intersect with the suggest FST.
> See the discussion here:
> http://lucene.472066.n3.nabble.com/minFuzzyLength-in-FuzzySuggester-behaves-differently-for-English-and-Russian-td4067018.html#none
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