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https://issues.apache.org/jira/browse/LUCENE-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171318#comment-13171318
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Robert Muir commented on LUCENE-2906:
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As much as I would like this to work as the patch does (where its automatic
from StandardFilter), I think its bad because its something we then have to
commit to/deal with for a while (e.g. backwards compat).
So another idea is just to call it CJKFilter or something under the CJK package
for now. We could still cutover CJKAnalyzer like the patch and then it finally
works with supplementary characters too (which I think is really long needed).
> Filter to process output of ICUTokenizer and create overlapping bigrams for
> CJK
> --------------------------------------------------------------------------------
>
> Key: LUCENE-2906
> URL: https://issues.apache.org/jira/browse/LUCENE-2906
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Tom Burton-West
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-2906.patch
>
>
> The ICUTokenizer produces unigrams for CJK. We would like to use the
> ICUTokenizer but have overlapping bigrams created for CJK as in the CJK
> Analyzer. This filter would take the output of the ICUtokenizer, read the
> ScriptAttribute and for selected scripts (Han, Kana), would produce
> overlapping bigrams.
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