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https://issues.apache.org/jira/browse/LUCENE-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975292#comment-13975292
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Mike Sokolov edited comment on LUCENE-5620 at 4/20/14 10:03 PM:
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I tested with some analysis chains, and I realized the new CaptureAttribute
will need a stack of term/position states in order to handle multiple
preserve/restore pairs either in sequence or nested.
Also, we should consider what to do with unbalanced preserve/restore pairs.
Maybe just don't restore anything, but it might be helpful to throw an
exception?
was (Author: sokolov):
I tested with some analysis chains, and I realized the new CaptureAttribute
will need a stack of term/position states in order to handle multiple
preserve/restore pairs either in sequence or nested.
> 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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