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From "Sujit Pal (JIRA)" <>
Subject [jira] [Updated] (LUCENE-3236) Make LowerCaseFilter and StopFilter keyword aware, similar to PorterStemFilter
Date Thu, 23 Jun 2011 21:10:48 GMT


Sujit Pal updated LUCENE-3236:

    Attachment: lucene-3236-patch.diff

Patch generated with svn diff from the top level Lucene/Solr trunk. Contains updates to LowerCaseFilter
and StopFilter to recognize and NOT operate on terms marked with KeywordAttribute.isKeyword.
(NOTE: also contains changes to which seem to have been generated automatically).

> Make LowerCaseFilter and StopFilter keyword aware, similar to PorterStemFilter
> ------------------------------------------------------------------------------
>                 Key: LUCENE-3236
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/analysis
>    Affects Versions: 4.0
>         Environment: N/A
>            Reporter: Sujit Pal
>            Priority: Minor
>              Labels: analysis
>             Fix For: 4.0
>         Attachments: lucene-3236-patch.diff
> 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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