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https://issues.apache.org/jira/browse/LUCENE-9328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17093214#comment-17093214
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Alan Woodward commented on LUCENE-9328:
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Would you be able to open this as a github pull request? It's much easier to 
review than a patch.

We need to deal with SortedNumeric and SortedSet iterators, because they also 
have the notion of a within-document iterator that will need to be independent 
between all the different consumers.  I'm also a bit worried about one consumer 
being able to advance the underlying values iterator too far.  Can we make the 
ReusingReader control advancing the iterators?

> SortingGroupHead to reuse DocValues
> -----------------------------------
>
>                 Key: LUCENE-9328
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9328
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/grouping
>            Reporter: Mikhail Khludnev
>            Assignee: Mikhail Khludnev
>            Priority: Minor
>         Attachments: LUCENE-9328.patch, LUCENE-9328.patch, LUCENE-9328.patch
>
>
> That's why 
> https://issues.apache.org/jira/browse/LUCENE-7701?focusedCommentId=17084365&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17084365



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