[jira] [Created] (LUCENE-8977) Handle punctuation characters in KoreanTokenizer

["Namgyu Kim (Jira)" <ji...@apache.org>]

Namgyu Kim created LUCENE-8977:
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             Summary: Handle punctuation characters in KoreanTokenizer
                 Key: LUCENE-8977
                 URL: https://issues.apache.org/jira/browse/LUCENE-8977
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Namgyu Kim


As we discussed on LUCENE-8966, KoreanTokenizer always divides into one and the others now when there are continuous punctuation marks.
 (사이즈.... => [사이즈] [.] [...])
 But KoreanTokenizer doesn't divides when first character is punctuation.
 (...사이즈 => [...] [사이즈])

It looks like the result from the viterbi path, but users can think weird about the following case:
 ("사이즈" means "size" in Korean)
||Case #1||Case #2||
|Input : "...사이즈..."|Input : "...4......4사이즈"|
|Result : [...] [사이즈] [.] [..]|Result : [...] [4] [.] [.....] [4] [사이즈]|

From what I checked, Nori has a punctuation characters(like . ,) in the dictionary but Kuromoji is not.
 ("サイズ" means "size" in Japanese)
||Case #1||Case #2||
|Input : "...サイズ..."|Input : "...4......4サイズ"|
|Result : [...] [サイズ] [...]|Result : [...] [4] [......] [4] [サイズ]|

There are some ways to resolve it like hard-coding for punctuation but it seems not good.
 So I think we need to discuss it.



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