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https://issues.apache.org/jira/browse/LUCENE-6369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378024#comment-14378024
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Adrien Grand commented on LUCENE-6369:
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This would work but I'm a bit on the fence to add a new API to Query.
> Make queries more defensive and clone deeply
> --------------------------------------------
>
> Key: LUCENE-6369
> URL: https://issues.apache.org/jira/browse/LUCENE-6369
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Fix For: 5.1
>
> Attachments: LUCENE-6369.patch
>
>
> It is very important for the query cache that queries be either immutable or
> clone deeply so that they cannot change after having been put into the cache.
> There are three issues that need to be addressed:
> - mutable queries such as boolean or phrase queries do not clone deeply
> - queries that wrap mutable objects such as TermQuery's term
> - filters inherit Query's default clone impl which is not enough in most
> cases
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