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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1224) NGramTokenFilter creates bad TokenStream
Date Thu, 15 May 2008 10:27:55 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597080#action_12597080
] 

Grant Ingersoll commented on LUCENE-1224:
-----------------------------------------

FWIW, I also think we should address the more philosophical question of what the intermediate
positions should be of the tokens.  The more I think about it, the more I think all "grams"
of a given word should be at the same position, but I would like to hear from others on this
before deciding.

> NGramTokenFilter creates bad TokenStream
> ----------------------------------------
>
>                 Key: LUCENE-1224
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1224
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/*
>            Reporter: Hiroaki Kawai
>            Assignee: Grant Ingersoll
>            Priority: Critical
>         Attachments: LUCENE-1224.patch, NGramTokenFilter.patch, NGramTokenFilter.patch
>
>
> With current trunk NGramTokenFilter(min=2,max=4) , I index "abcdef" string into an index,
but I can't query it with "abc". If I query with "ab", I can get a hit result.
> The reason is that the NGramTokenFilter generates badly ordered TokenStream. Query is
based on the Token order in the TokenStream, that how stemming or phrase should be anlayzed
is based on the order (Token.positionIncrement).
> With current filter, query string "abc" is tokenized to : ab bc abc 
> meaning "query a string that has ab bc abc in this order".
> Expected filter will generate : ab abc(positionIncrement=0) bc
> meaning "query a string that has (ab|abc) bc in this order"
> I'd like to submit a patch for this issue. :-)

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