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https://issues.apache.org/jira/browse/LUCENE-3496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123147#comment-13123147
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Yonik Seeley commented on LUCENE-3496:
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Wow, only a 9% performance penalty for not keeping the values in the JVM heap?
That's quite an achievement (and almost hard to believe, unless the base query
were really expensive or something). Nice job!
> Support grouping by IndexDocValues
> ----------------------------------
>
> Key: LUCENE-3496
> URL: https://issues.apache.org/jira/browse/LUCENE-3496
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/grouping
> Reporter: Martijn van Groningen
> Attachments: LUCENE-3496.patch, LUCENE-3496.patch
>
>
> Although IDV is not yet finalized (More particular the SortedSource). I think
> we already can discuss / investigate implementing grouping by IDV.
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