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https://issues.apache.org/jira/browse/LUCENE-3921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471121#comment-13471121
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Lance Norskog commented on LUCENE-3921:
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Statistical models and rule-based models always have a failure rate. When you
use them you have to decide what to do about the failures. Attacking the
failures with another model drives toward Xeno's Paradox. For Chinese language
search, breaking the failures into bigrams makes a lot of sense.
Another way to look at this is that Smart Chinese and Kuromoji are systems for
minimizing bogus bigrams. This allows phrase queries to function without
finding bogus results. The CJK bigram creator generates bogus bigrams, which
cause phrase queries to find bogus results. [SOLR-3653] is the result of my
experience in supporting searching Chinese legal documents. I have some useful
numbers at the end of the page.
> Add decompose compound Japanese Katakana token capability to Kuromoji
> ---------------------------------------------------------------------
>
> Key: LUCENE-3921
> URL: https://issues.apache.org/jira/browse/LUCENE-3921
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 4.0-ALPHA
> Environment: Cent OS 5, IPA Dictionary, Run with "Search mdoe"
> Reporter: Kazuaki Hiraga
> Labels: features
>
> Japanese morphological analyzer, Kuromoji doesn't have a capability to
> decompose every Japanese Katakana compound tokens to sub-tokens. It seems
> that some Katakana tokens can be decomposed, but it cannot be applied every
> Katakana compound tokens. For instance, "トートバッグ(tote bag)" and "ショルダーバッグ"
> don't decompose into "トート バッグ" and "ショルダー バッグ" although the IPA dictionary
> has "バッグ" in its entry. I would like to apply the decompose feature to every
> Katakana tokens if the sub-tokens are in the dictionary or add the capability
> to force apply the decompose feature to every Katakana tokens.
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