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https://issues.apache.org/jira/browse/LUCENE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743933#action_12743933
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Paul Cowan edited comment on LUCENE-1813 at 8/16/09 5:04 PM:
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Yeah, ok, makes sense.
I'd suggest choosing a range of Private Use characters from the BMP block then,
that's what they're for. Doesn't really matter which... we can pick a block of
(say) 256 and use the first one for this, then others can be used for other
purposes later if required. U+ECxx, maybe, because that's got 3 letters out of
'lucene' in it :) . So EC00 means 'reversed', and then people who need other
similar filters can organise amongst themselves.
was (Author: pcowan):
Yeah, ok, makes sense.
I'd suggest choosing a range of Private Use characters from the BMP block then,
that's what they're for. Doesn't really matter which... we can pick a block of
(say) 256 and use the first one for this, then others can be used for other
purposes later if required. U+ECxx, maybe, because that's got 3 letters out of
'lucene' in it. So EC00 means 'reversed', and then people who need other
similar filters can organise amongst themselves.
> 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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