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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974914#comment-13974914
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Mike Sokolov commented on LUCENE-5620:
--------------------------------------

Maybe I am operating based on a misunderstanding, but isn't it the case that 
each field/term/position/document combination adds a posting to the index?  I 
do like the idea of a generic "preserve original" filter that can work with any 
filter/combination of filters, since I agree it's silly to duplicate this logic 
for every filter.  How would you see that working?

> 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
>
>
> 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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