StopFilter should not create a new CharArraySet if the given set is already an
instance of CharArraySet
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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
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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