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Posted to dev@lucene.apache.org by "Steve Rowe (JIRA)" <ji...@apache.org> on 2013/05/11 00:51:15 UTC
[jira] [Updated] (LUCENE-4955) NGramTokenFilter increments
positions for each gram
[ https://issues.apache.org/jira/browse/LUCENE-4955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Rowe updated LUCENE-4955:
-------------------------------
Labels: lucene-4.3.1-candidate (was: )
> 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
> Labels: lucene-4.3.1-candidate
> 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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