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https://issues.apache.org/jira/browse/LUCENE-2909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Sekiguchi reassigned LUCENE-2909:
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Assignee: Koji Sekiguchi
> NGramTokenFilter may generate offsets that exceed the length of original text
> -----------------------------------------------------------------------------
>
> Key: LUCENE-2909
> URL: https://issues.apache.org/jira/browse/LUCENE-2909
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/analyzers
> Affects Versions: 2.9.4
> Reporter: Shinya Kasatani
> Assignee: Koji Sekiguchi
> Priority: Minor
> Attachments: TokenFilterOffset.patch
>
>
> Whan using NGramTokenFilter combined with CharFilters that lengthen the
> original text (such as "ß" -> "ss"), the generated offsets exceed the length
> of the origianal text.
> This causes InvalidTokenOffsetsException when you try to highlight the text
> in Solr.
> While it is not possible to know the accurate offset of each character once
> you tokenize the whole text with tokenizers like KeywordTokenizer,
> NGramTokenFilter should at least avoid generating invalid offsets.
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