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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2167) Implement StandardTokenizer with the UAX#29 Standard
Date Sun, 07 Nov 2010 16:24:05 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929363#action_12929363
] 

Robert Muir commented on LUCENE-2167:
-------------------------------------

bq.  because when people want full URLs, they can't be reassembled after the separator chars
are thrown away by the tokenizer.

Well, i dont much like this argument, because its true about anything.
Indexing text for search is a lossy thing by definition.

yeah, when you tokenize this stuff, you lose paragraphs, sentences, all kinds of things.
should we output whole paragraphs as tokens so its not lost? 

bq. Robert, when I mentioned the decomposition filter, you said you didn't like that idea.
Do you still feel the same?

Well, i said it was a can of worms, i still feel that it is complicated, yes.
But i mean we do have a ghetto decomposition filter (WordDelimiterFilter) already.
And someone can use this with the UAX#29+URLRecognizingTokenizer to index these urls in a
variety of ways, including preserving the original full url too.

bq. Would a URL decomposition filter, with full URL emission turned off by default, work here?

It works in theory, but its confusing that its 'required' to not get absymal tokens.
i would prefer we switch the situation around: make UAX#29 'standardtokenizer' and give the
uax#29+url+email+ip+... a different name.

because to me, uax#29 handles urls in nice ways, e.g. my user types 'facebook' and they get
back facebook.com
its certainly simple and won't blow up terms dictionaries...

otherwise, creating lots of long, unique tokens (urls) by default is a serious performance
trap, particularly for lucene 3.x



> Implement StandardTokenizer with the UAX#29 Standard
> ----------------------------------------------------
>
>                 Key: LUCENE-2167
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2167
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/analyzers
>    Affects Versions: 3.1, 4.0
>            Reporter: Shyamal Prasad
>            Assignee: Steven Rowe
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2167-jflex-tld-macro-gen.patch, LUCENE-2167-jflex-tld-macro-gen.patch,
LUCENE-2167-jflex-tld-macro-gen.patch, LUCENE-2167-lucene-buildhelper-maven-plugin.patch,
LUCENE-2167.benchmark.patch, LUCENE-2167.benchmark.patch, LUCENE-2167.benchmark.patch, LUCENE-2167.patch,
LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch,
LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch,
LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch,
LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, standard.zip, StandardTokenizerImpl.jflex
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> It would be really nice for StandardTokenizer to adhere straight to the standard as much
as we can with jflex. Then its name would actually make sense.
> Such a transition would involve renaming the old StandardTokenizer to EuropeanTokenizer,
as its javadoc claims:
> bq. This should be a good tokenizer for most European-language documents
> The new StandardTokenizer could then say
> bq. This should be a good tokenizer for most languages.
> All the english/euro-centric stuff like the acronym/company/apostrophe stuff can stay
with that EuropeanTokenizer, and it could be used by the european analyzers.

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