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https://issues.apache.org/jira/browse/LUCENE-3236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-3236:
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Fix Version/s: (was: 4.7)
4.8
> Make LowerCaseFilter and StopFilter keyword aware, similar to PorterStemFilter
> ------------------------------------------------------------------------------
>
> Key: LUCENE-3236
> URL: https://issues.apache.org/jira/browse/LUCENE-3236
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 4.0-ALPHA
> Environment: N/A
> Reporter: Sujit Pal
> Priority: Minor
> Labels: analysis
> Fix For: 4.8
>
> Attachments: lucene-3236-patch.diff, scan.pdf
>
>
> PorterStemFilter has functionality to detect if a term has been marked as a
> "keyword" by the KeywordMarkerFilter (KeywordAttribute.isKeyword() == true),
> and if so, skip stemming.
> The suggestion is to have the same functionality in other filters where it is
> applicable. I think it may be particularly applicable to the LowerCaseFilter
> (ie if it is a keyword, don't mess with the case), and StopFilter (if it is a
> keyword, then don't filter it out even if it looks like a stop word).
> Backward compatibility is maintained (in both cases) by adding a new
> constructor which takes an additional boolean parameter ignoreKeyword. The
> current constructor will call this new constructor with ignoreKeyword = false.
> Patches are attached (for LowerCaseFilter and StopFilter).
> I have verified that the analysis JUnit tests run against the updated code,
> ie, backward compatibility is maintained.
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