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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1813) Add option to ReverseStringFilter to mark reversed tokens
Date Mon, 17 Aug 2009 00:12:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743935#action_12743935
] 

Robert Muir commented on LUCENE-1813:
-------------------------------------

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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