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https://issues.apache.org/jira/browse/LUCENE-5237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776087#comment-13776087
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Adrien Grand commented on LUCENE-5237:
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+1 I would just put @lucene.internal on the whole class instead of each method.
> StemmerUtil.deleteN may delete too many characters
> --------------------------------------------------
>
> Key: LUCENE-5237
> URL: https://issues.apache.org/jira/browse/LUCENE-5237
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-5237.patch, LUCENE-5237.patch
>
>
> StemmerUtil.deleteN calls to delete(), but in some cases, it may delete too
> many characters. E.g. if you execute this code:
> {code}
> char[] buf = "abcd".toCharArray();
> int len = StemmerUtil.deleteN(buf, buf.length, buf.length, 3);
> System.out.println(new String(buf, 0, len));
> {code}
> You get "a", even though no character should have been deleted (not according
> to the javadocs nor common logic).
> The problem is in delete(), which always returns {{len-1}}, even if no
> character is actually deleted.
> I'll post a patch that fixes it shortly.
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