[jira] [Commented] (LUCENE-3940) When Japanese (Kuromoji) tokenizer removes a punctuation token it should leave a hole

["Robert Muir (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-3940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243744#comment-13243744 ] 

Robert Muir commented on LUCENE-3940:
-------------------------------------

I think kuromoji has the problem: here it creates 'fake' intermediate 'tokens' and then deletes them and this somehow screws up the decompounding graph???

it should never create these tokens in the first place! I think its well accepted that words carry the information content of a doc, punctuation has no information content really here, it doesn't tell me what the doc is about, and I don't think this is controversial, I just think your view on this is extreme...

                
> When Japanese (Kuromoji) tokenizer removes a punctuation token it should leave a hole
> -------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3940
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3940
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-3940.patch, LUCENE-3940.patch, LUCENE-3940.patch
>
>
> I modified BaseTokenStreamTestCase to assert that the start/end
> offsets match for graph (posLen > 1) tokens, and this caught a bug in
> Kuromoji when the decompounding of a compound token has a punctuation
> token that's dropped.
> In this case we should leave hole(s) so that the graph is intact, ie,
> the graph should look the same as if the punctuation tokens were not
> initially removed, but then a StopFilter had removed them.
> This also affects tokens that have no compound over them, ie we fail
> to leave a hole today when we remove the punctuation tokens.
> I'm not sure this is serious enough to warrant fixing in 3.6 at the
> last minute...

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