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https://issues.apache.org/jira/browse/LUCENE-9328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098112#comment-17098112
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Mikhail Khludnev commented on LUCENE-9328:
------------------------------------------

Ok. [~romseygeek], thanks for the clue. It turns to be more complex problem. I 
pushed some broken code to github PR  
https://github.com/apache/lucene-solr/pull/1462/. Currently I'm stuck at 
[ToParentDocValues.advanceExact()|https://github.com/apache/lucene-solr/blob/master/lucene/join/src/java/org/apache/lucene/search/join/ToParentDocValues.java#L259]
 which turns it to strict {{advance()}}. I think it's can be changed to use 
{{advanceExact()}}. Does it make any sense?   

> 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
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> 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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