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https://issues.apache.org/jira/browse/LUCENE-5437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894500#comment-13894500
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Nik Everett commented on LUCENE-5437:
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I thought about that but my instinct was that duplicating with the keyword
attribute would add overhead in the case where there aren't characters to fold
which is by far the more common case. I think you'd also have to make
supporting the keyword attribute optional so it wouldn't break backwards
compatibility. I figured optionally supporting the keyword attribute would be
about the same amount of work/code as only duplicating when required so I went
that way. I went with adding the extra class and moving the real
implementation to an absract base class more out of desire to be minimally
invasive to the original then anything technical.
> ASCIIFoldingFilter that emits both unfolded and folded tokens
> -------------------------------------------------------------
>
> Key: LUCENE-5437
> URL: https://issues.apache.org/jira/browse/LUCENE-5437
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Nik Everett
> Assignee: Simon Willnauer
> Priority: Minor
> Attachments: LUCENE-5437.patch
>
>
> I've found myself wanting an ASCIIFoldingFilter that emits both the folded
> tokens and the original, unfolded tokens.
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