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https://issues.apache.org/jira/browse/LUCENE-5703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015559#comment-14015559
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Robert Muir commented on LUCENE-5703:
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Thanks for tackling this! I will help with the reviews, its a tricky one.

I didn't yet look, do SORTED/SORTED_SET TermsEnums also have the new behavior? 
This was another source of stupid stuff, I think they should be consistent with 
other termsenums (and now lookupOrd).

> Don't allocate/copy bytes all the time in binary DV producers
> -------------------------------------------------------------
>
>                 Key: LUCENE-5703
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5703
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>             Fix For: 4.9, 5.0
>
>         Attachments: LUCENE-5703.patch
>
>
> Our binary doc values producers keep on creating new {{byte[]}} arrays and 
> copying bytes when a value is requested, which likely doesn't help 
> performance. This has been done because of the way fieldcache consumers used 
> the API, but we should try to fix it in 5.0.



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