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https://issues.apache.org/jira/browse/LUCENE-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797779#action_12797779
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Yonik Seeley commented on LUCENE-2197:
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bq. Yet, according to the javadoc, the instance of CharArraySet should be
passed to CharArraySet.copy (which is very fast for CharArraySet instances)
instead of "copied" via "new CharArraySet()"
We shouldn't copy it at all.
> StopFilter should not create a new CharArraySet if the given set is already
> an instance of CharArraySet
> -------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2197
> URL: https://issues.apache.org/jira/browse/LUCENE-2197
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Affects Versions: 3.1
> Reporter: Simon Willnauer
> Priority: Critical
> Fix For: 3.1
>
> Attachments: LUCENE-2197.patch
>
>
> With LUCENE-2094 a new CharArraySet is created no matter what type of set is
> passed to StopFilter. This does not behave as documented and could introduce
> serious performance problems. Yet, according to the javadoc, the instance of
> CharArraySet should be passed to CharArraySet.copy (which is very fast for
> CharArraySet instances) instead of "copied" via "new CharArraySet()"
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