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https://issues.apache.org/jira/browse/SOLR-822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Bennett updated SOLR-822:
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Attachment: japanese-h-to-k-mapping.txt
In SOLR-814 it was suggested that some systems might want to normalizes all
Hiragana characters to their Katakana counterpart.
Although this is not universally agreed to, *if* somebody wanted to do it, I
believe this mapping file would peform that task when used with this 822 patch.
I don't speak Japanese and don't have test content yet, so I'm not 100% it
works, but wanted to upload it as a start.
> CharFilter - normalize characters before tokenizer
> --------------------------------------------------
>
> Key: SOLR-822
> URL: https://issues.apache.org/jira/browse/SOLR-822
> Project: Solr
> Issue Type: New Feature
> Components: Analysis
> Affects Versions: 1.3
> Reporter: Koji Sekiguchi
> Assignee: Koji Sekiguchi
> Priority: Minor
> Fix For: 1.4
>
> Attachments: character-normalization.JPG,
> japanese-h-to-k-mapping.txt, sample_mapping_ja.txt, sample_mapping_ja.txt,
> SOLR-822-for-1.3.patch, SOLR-822-renameMethod.patch, SOLR-822.patch,
> SOLR-822.patch, SOLR-822.patch, SOLR-822.patch, SOLR-822.patch
>
>
> A new plugin which can be placed in front of <tokenizer/>.
> {code:xml}
> <fieldType name="textCharNorm" class="solr.TextField"
> positionIncrementGap="100" >
> <analyzer>
> <charFilter class="solr.MappingCharFilterFactory"
> mapping="mapping_ja.txt" />
> <tokenizer class="solr.MappingCJKTokenizerFactory"/>
> <filter class="solr.StopFilterFactory" ignoreCase="true"
> words="stopwords.txt"/>
> <filter class="solr.LowerCaseFilterFactory"/>
> </analyzer>
> </fieldType>
> {code}
> <charFilter/> can be multiple (chained). I'll post a JPEG file to show
> character normalization sample soon.
> MOTIVATION:
> In Japan, there are two types of tokenizers -- N-gram (CJKTokenizer) and
> Morphological Analyzer.
> When we use morphological analyzer, because the analyzer uses Japanese
> dictionary to detect terms,
> we need to normalize characters before tokenization.
> I'll post a patch soon, too.
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