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Posted to dev@lucene.apache.org by "Simon Willnauer (JIRA)" <ji...@apache.org> on 2013/04/24 18:49:15 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 ]
Simon Willnauer updated LUCENE-4955:
------------------------------------
Attachment: highlighter-test.patch
LUCENE-4955.patch
here is a patch including the deprecation and version support (I bet somebody relies on this behaviour) ...for trunk I will remove the deprecated methods but I added it here to make sure I don't miss it.
the second patch is a test for the highlighter that produces a SIOOB without the patch but succeeds with the positions patch.
> 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
> Fix For: 5.0, 4.4
>
> Attachments: highlighter-test.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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