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https://issues.apache.org/jira/browse/LUCENE-1796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741382#action_12741382
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Uwe Schindler commented on LUCENE-1796:
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bq. is there a way to optimize clear() in any way?
The cost is creating the iterator. As it is a LinkedHashMap, there must be used
an iterator (because direct access is slow), but for extra safety the iterator
is made unmodifable, this wrapper around could be removed.
> Speed up repeated TokenStream init
> ----------------------------------
>
> Key: LUCENE-1796
> URL: https://issues.apache.org/jira/browse/LUCENE-1796
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Uwe Schindler
> Fix For: 2.9
>
> Attachments: LUCENE-1796.patch
>
>
> by caching isMethodOverridden results
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