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https://issues.apache.org/jira/browse/LUCENE-3496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123201#comment-13123201
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Simon Willnauer commented on LUCENE-3496:
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bq.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!
wait! this is in memory - martjin can you test with getDirectSource() instead
of getSource()?
> 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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