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From "Michael McCandless (Updated) (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3940) When Japanese (Kuromoji) tokenizer removes a punctuation token it should leave a hole
Date Sun, 01 Apr 2012 17:30:28 GMT


Michael McCandless updated LUCENE-3940:

    Attachment: LUCENE-3940.patch

New patch, implementing the idea above.  I think it's ready...

It also means we can unconditionally check for correct offsets in
graph tokens, which is nice.

> When Japanese (Kuromoji) tokenizer removes a punctuation token it should leave a hole
> -------------------------------------------------------------------------------------
>                 Key: LUCENE-3940
>                 URL:
>             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, 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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