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https://issues.apache.org/jira/browse/LUCENE-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650856#comment-13650856
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Adrien Grand commented on LUCENE-3907:
--------------------------------------
As Steve suggested, I think these tokenizers/filters need to be renamed (trunk
only) since they don't support backward graming anymore. Please don't hesitate
to let me know if you have a good idea for a name, otherwise I plan to rename
them to "Leading..." in the next few days.
> Improve the Edge/NGramTokenizer/Filters
> ---------------------------------------
>
> Key: LUCENE-3907
> URL: https://issues.apache.org/jira/browse/LUCENE-3907
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Adrien Grand
> Labels: gsoc2013
> Fix For: 4.3
>
> Attachments: LUCENE-3907.patch
>
>
> Our ngram tokenizers/filters could use some love. EG, they output ngrams in
> multiple passes, instead of "stacked", which messes up offsets/positions and
> requires too much buffering (can hit OOME for long tokens). They clip at
> 1024 chars (tokenizers) but don't (token filters). The split up surrogate
> pairs incorrectly.
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