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https://issues.apache.org/jira/browse/LUCENE-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653520#action_12653520
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Robert Muir commented on LUCENE-1390:
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sorry, that wasn't a fair test case. a good chunk of those docs contain accents
outside of latin1, so asciifoldingfilter was doing more work
i reran on some heavily accented (but only latin1) data and the difference was
negligible, 1% or so
appears asciifoldingfilter only slows you down versus isolatin1accentfilter in
the case where it probably should be! (you have accents outside of latin1 but
are using latin1accentfilter)
> add ISOLatinAccentFilter and deprecate ISOLatin1AccentFilter
> ------------------------------------------------------------
>
> Key: LUCENE-1390
> URL: https://issues.apache.org/jira/browse/LUCENE-1390
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Environment: any
> Reporter: Andi Vajda
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 2.9
>
> Attachments: ASCIIFoldingFilter.patch, ASCIIFoldingFilter.patch,
> ASCIIFoldingFilter.patch
>
>
> The ISOLatin1AccentFilter is removing accents from accented characters in the
> ISO Latin 1 character set.
> It does what it does and there is no bug with it.
> It would be nicer, though, if there was a more comprehensive version of this
> code that included not just ISO-Latin-1 (ISO-8859-1) but the entire Latin 1
> and Latin Extended A unicode blocks.
> See: http://en.wikipedia.org/wiki/Latin-1_Supplement_unicode_block
> See: http://en.wikipedia.org/wiki/Latin_Extended-A_unicode_block
> That way, all languages using roman characters are covered.
> A new class, ISOLatinAccentFilter is attached. It is intended to supercede
> ISOLatin1AccentFilter which should get deprecated.
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