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https://issues.apache.org/jira/browse/LUCENE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743935#action_12743935
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Robert Muir commented on LUCENE-1813:
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I looked into this and I think using the private use area (U+E000 to U+F8FF)
would also not be the best.
I do not think Lucene should use PUA characters system-internally, besides I
have at least a few docs with PUA characters, and I think others will as well.
We should leave PUA characters available to the end user.
So personally I have nothing against this U+0001, but I'll take any
recommendations...
> Add option to ReverseStringFilter to mark reversed tokens
> ---------------------------------------------------------
>
> Key: LUCENE-1813
> URL: https://issues.apache.org/jira/browse/LUCENE-1813
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/analyzers
> Affects Versions: 2.9
> Reporter: Andrzej Bialecki
> Assignee: Robert Muir
> Fix For: 2.9
>
> Attachments: reverseMark-2.patch, reverseMark.patch
>
>
> This patch implements additional functionality in the filter to "mark"
> reversed tokens with a special marker character (Unicode 0001). This is
> useful when indexing both straight and reversed tokens (e.g. to implement
> efficient leading wildcards search).
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