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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 11:28:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744023#action_12744023
] 

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

Ted, with the current patch you can do this: new ReverseStringFilter('\u200E'), or new ReverseStringFilter('\u200F'),
or new ReverseStringFilter('\u0001'), or whatever.

Also, for anyone using this filter its my understanding that each term in lucene's term dictionary
is a "delta" versus the previous term, so the character you choose should not affect its size?


> 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: LUCENE-1813.patch, 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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