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From "Robert Muir (JIRA)" <>
Subject [jira] Updated: (LUCENE-2068) fix reverseStringFilter for unicode 4.0
Date Tue, 17 Nov 2009 16:37:39 GMT


Robert Muir updated LUCENE-2068:

    Issue Type: Bug  (was: Improvement)

Due to the way this currently works, taking completely valid unicode data and making invalid
unicode data, I am changing this to bug, as Mark hinted at.

> fix reverseStringFilter for unicode 4.0
> ---------------------------------------
>                 Key: LUCENE-2068
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/analyzers
>            Reporter: Robert Muir
>            Assignee: Simon Willnauer
>            Priority: Minor
>             Fix For: 3.1
>         Attachments: LUCENE-2068.patch, LUCENE_2068.patch, LUCENE_2068.patch
> ReverseStringFilter is not aware of supplementary characters: when it reverses it will
create unpaired surrogates, which will be replaced by U+FFFD by the indexer (but not at query
> The wrong words will conflate to each other, and the right words won't match, basically
the whole thing falls apart.
> This patch implements in-place reverse with the algorithm from apache harmony AbstractStringBuilder.reverse0()

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