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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-5030) 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
Date Mon, 01 Jul 2013 21:03:22 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-5030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-5030:
---------------------------------------

    Fix Version/s: 4.4
                   5.0
    
> 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
>            Assignee: Michael McCandless
>             Fix For: 5.0, 4.4
>
>         Attachments: benchmark-INFO_SEP.txt, benchmark-old.txt, benchmark-wo_convertion.txt,
LUCENE-5030.patch, nonlatin_fuzzySuggester1.patch, nonlatin_fuzzySuggester2.patch, nonlatin_fuzzySuggester3.patch,
nonlatin_fuzzySuggester4.patch, nonlatin_fuzzySuggester_combo1.patch, nonlatin_fuzzySuggester_combo2.patch,
nonlatin_fuzzySuggester_combo.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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