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https://issues.apache.org/jira/browse/LUCENE-9328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17086679#comment-17086679
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Alan Woodward commented on LUCENE-9328:
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Can we try and avoid making any changes to FieldComparator and friends? I
think we can do this entirely within AllGroupHeadsCollector, by wrapping
incoming LeafReaders with a FilterLeafReader that caches the various DocValues
iterators. We may need to make some changes to allow a FilterLeafReader to
keep its inner reader's context though, so that the comparators see the correct
docBase.
> 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
> Priority: Minor
> Attachments: 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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