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Posted to dev@lucene.apache.org by "Steve Rowe (JIRA)" <ji...@apache.org> on 2013/05/11 00:49:18 UTC

[jira] [Commented] (LUCENE-4955) NGramTokenFilter increments positions for each gram

    [ https://issues.apache.org/jira/browse/LUCENE-4955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13654967#comment-13654967 ] 

Steve Rowe commented on LUCENE-4955:
------------------------------------

If there are no objections, I'd like to backport this to 4.3.1.
                
> NGramTokenFilter increments positions for each gram
> ---------------------------------------------------
>
>                 Key: LUCENE-4955
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4955
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/analysis
>    Affects Versions: 4.3
>            Reporter: Simon Willnauer
>            Assignee: Adrien Grand
>             Fix For: 5.0, 4.4
>
>         Attachments: highlighter-test.patch, highlighter-test.patch, LUCENE-4955.patch, LUCENE-4955.patch
>
>
> NGramTokenFilter increments positions for each gram rather for the actual token which can lead to rather funny problems especially with highlighting. if this filter should be used for highlighting is a different story but today this seems to be a common practice in many situations to highlight sub-term matches.
> I have a test for highlighting that uses ngram failing with a StringIOOB since tokens are sorted by position which causes offsets to be mixed up due to ngram token filter.

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