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https://issues.apache.org/jira/browse/LUCENE-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596413#comment-13596413
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Uwe Schindler commented on LUCENE-3907:
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bq. Back grams would work for leading wildcards. They might be useful for
things where the head is at the end (tail-first?), like domain names.
If you need reverse n-grams, you could always add a filter to do that
afterwards. There is no need to have this as separate logic in *this* filter.
We should split logic and keep filters as simple as possible.
> 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: gsoc2012, lucene-gsoc-12
> Fix For: 4.2
>
>
> 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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