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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974921#comment-13974921
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Robert Muir commented on LUCENE-5620:
-------------------------------------
{quote}
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?
{quote}
Thats exactly the case. So whether you have field1:UPPER->0 and
field1:upper->0, or field1:UPPER->0 and field2:upper->0 makes no difference.
> 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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