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https://issues.apache.org/jira/browse/LUCENE-8553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16671939#comment-16671939
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Robert Muir commented on LUCENE-8553:
-------------------------------------
Can't we just use unicode normalization for this? NFD/NFKD will decompose.
> New KoreanDecomposeFilter for KoreanAnalyzer(Nori)
> --------------------------------------------------
>
> Key: LUCENE-8553
> URL: https://issues.apache.org/jira/browse/LUCENE-8553
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Namgyu Kim
> Priority: Major
> Attachments: LUCENE-8553.patch
>
>
> This is a patch for KoreanDecomposeFilter.
> This filter can be used to decompose Hangul.
> (ex) 한글 -> ㅎㄱ or ㅎㅏㄴㄱㅡㄹ)
> Hangul input is very unique.
> If you want to type apple in English,
> you can type it in the order {color:#FF0000}a -> p -> p -> l -> e{color}.
> However, if you want to input "Hangul" in Hangul,
> you have to type it in the order of {color:#FF0000}ㅎ -> ㅏ -> ㄴ -> ㄱ -> ㅡ
> -> ㄹ{color}.
> (Because of the keyboard shape)
> This means that spell check with existing full Hangul can be less accurate.
>
> The structure of Hangul consists of elements such as *"Choseong"*,
> *"Jungseong"*, and *"Jongseong"*.
> These three elements are called *"Jamo"*.
> If you have the Korean word "된장찌개" (that means Soybean Paste Stew)
> *"Choseong"* means {color:#FF0000}"ㄷ, ㅈ, ㅉ, ㄱ"{color},
> *"Jungseong"* means {color:#FF0000}"ㅚ, ㅏ, ㅣ, ㅐ"{color},
> *"Jongseong"* means {color:#FF0000}"ㄴ, ㅇ"{color}.
> The reason for Jamo separation is explained above. (spell check)
> Also, the reason we need "Choseong Filter" is because many Koreans use
> *"Choseong Search"* (especially in mobile environment).
> If you want to search for "된장찌개" you need 10 typing, which is quite a lot.
> For that reason, I think it would be useful to provide a filter that can be
> searched by "ㄷㅈㅉㄱ".
> Hangul also has *dual chars*, such as
> "ㄲ, ㄸ, ㅁ, ㅃ, ㅉ, ㅚ (ㅗ + ㅣ), ㅢ (ㅡ + ㅣ), ...".
> For such reasons,
> KoreanDecompose offers *5 options*,
> ex) *된장찌개* => [된장], [찌개]
> *1) ORIGIN*
> [된장], [찌개]
> *2) SINGLECHOSEONG*
> [ㄷㅈ], [ㅉㄱ]
> *3) DUALCHOSEONG*
> [ㄷㅈ], [ㅈㅈㄱ]
> *4) SINGLEJAMO*
> [ㄷㅚㄴㅈㅏㅇ], [ㅉㅣㄱㅐ]
> *5) DUALJAMO*
> [ㄷㅗㅣㄴㅈㅏㅇ], [ㅈㅈㅣㄱㅐ]
>
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