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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975118#comment-13975118
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Mike Sokolov commented on LUCENE-5620:
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Yes, that looks good to me. I like that this can be applied to arbitrary
filters. Thanks for pushing ahead with this, Robert. I think it'll be a nice
little addition.
> LowerCaseFilter.preserveOriginal
> --------------------------------
>
> Key: LUCENE-5620
> URL: https://issues.apache.org/jira/browse/LUCENE-5620
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mike Sokolov
> Attachments: LUCENE-5620.patch, LUCENE-5620.patch
>
>
> Following closely the model of LUCENE-5437 (which worked on
> ASCIIFoldingFilter), this patch adds the ability to preserve the original
> token to LowerCaseFilter. This is useful if you want an all-lowercase search
> term to match without regard to case, while search terms with uppercase
> letters match in a case-sensitive manner.
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