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https://issues.apache.org/jira/browse/LUCENE-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797784#action_12797784
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Yonik Seeley commented on LUCENE-2197:
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Comment from LUCENE-2094 the other issue:
bq. To prevent provided set from being modified while they are in use in a
filter the given set is copied and wrapped in an immutable instance of
chararrayset.
We should really avoid this type of nannyism in Lucene.
> 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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