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https://issues.apache.org/jira/browse/LUCENE-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-3907:
---------------------------------
Attachment: LUCENE-3907.patch
Here is a patch that fixes EdgeNGramTokenizer and EdgeNGramTokenFilter so that
they pass TestRandomChains.
It also deprecates Side.BACK so when committing, I propose to follow Steve's
advice to rename them to LeadingNGramTokenizer and LeadingNGramTokenFilter in
trunk.
> 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: Uwe Schindler
> 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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