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https://issues.apache.org/jira/browse/LUCENE-8784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845933#comment-16845933
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Namgyu Kim commented on LUCENE-8784:
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Thank you for your reply, [~jim.ferenczi] :D
I tried to process only "." character in Tokenizer.
Because Korean is a language that can have a whitespace in sentence, but
Japanese is not.
(Character.OTHER_PUNCTUATION would match more than just the full stop
character. => Right. That's a problem. I have to change that part...)
JapaneseTokenizer keeps whitespace when using the discardPunctuation option.
(example : "十万二千五 百 二千五" (means "102005 100 2005")
If we run the JapaneseTokenizer with discardPunctuation=false and
JapaneseNumberFilter, we get:
{"102005", " ", "100", " ", "2005"})
Of course we can do it with StopFilter or internal processing in other Filter,
but is it okay..?
Developing a NumberFilter looks much more flexible and structurally beautiful
rather than internal processing in Tokenizer.
But I have developed like this because of the above problems, how can we
handle those spaces?
I think there are several ways to handle this problem:
1) Remove whitespace from Punctuation list in Tokenizer.
2) Use a TokenFilter to remove whitespace.
3) Remove whitespace from KoreanNumberFilter. (looks structurally strange...)
4) Just leave whitespace
> Nori(Korean) tokenizer removes the decimal point.
> ---------------------------------------------------
>
> Key: LUCENE-8784
> URL: https://issues.apache.org/jira/browse/LUCENE-8784
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Munkyu Im
> Priority: Major
> Attachments: LUCENE-8784.patch
>
>
> This is the same issue that I mentioned to
> [https://github.com/elastic/elasticsearch/issues/41401#event-2293189367]
> unlike standard analyzer, nori analyzer removes the decimal point.
> nori tokenizer removes "." character by default.
> In this case, it is difficult to index the keywords including the decimal
> point.
> It would be nice if there had the option whether add a decimal point or not.
> Like Japanese tokenizer does, Nori need an option to preserve decimal point.
>
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