[ https://issues.apache.org/jira/browse/LUCENE-1040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539599 ] 

Yonik Seeley commented on LUCENE-1040:
--------------------------------------

> and StopFilter.next should be responsible for lowercasing the terms before doing the set lookup

That would force the user (StopFilter) to make a copy since it wouldn't want to touch the original.

> Can't quickly create StopFilter
> -------------------------------
>
>                 Key: LUCENE-1040
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1040
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Yonik Seeley
>            Assignee: Yonik Seeley
>         Attachments: CharArraySet.patch, CharArraySet.take2.patch
>
>
> Due to the use of CharArraySet by StopFilter, one can no longer efficiently pre-create a Set for use by future StopFilter instances.

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