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https://issues.apache.org/jira/browse/LUCENE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797710#action_12797710
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Robert Muir commented on LUCENE-2195:
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well then something must be decided: either we use null sets,remove use of
EMPTY_SET all over the place, and have if set != null scattered all over the
place, or we go this route.
i do not care either way but we should not be using EMPTY_SET in various
tokenstreams without this patch, else we unnecessarily hash every input token
for no good reason.
> Speedup CharArraySet if set is empty
> ------------------------------------
>
> Key: LUCENE-2195
> URL: https://issues.apache.org/jira/browse/LUCENE-2195
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Simon Willnauer
> Fix For: 3.1
>
> Attachments: LUCENE-2195.patch, LUCENE-2195.patch
>
>
> CharArraySet#contains(...) always creates a HashCode of the String, Char[] or
> CharSequence even if the set is empty.
> contains should return false if set it empty
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