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https://issues.apache.org/jira/browse/LUCENE-3496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149689#comment-13149689
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Martijn van Groningen commented on LUCENE-3496:
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I was planning on doing this. I'm almost ready to commit it. I'm only a bit
stuck on documents that don't have a value for a group field.
The random grouping tests also add documents with a null value for the group
field and an empty string for the group field. This works fine with the term
based implementations, but not the DV based implementations (random test fail).
Should we not use null as group value if the dv based implementations are used
during the test?
> 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
> Assignee: Martijn van Groningen
> Fix For: 4.0
>
> Attachments: LUCENE-3496.patch, LUCENE-3496.patch, LUCENE-3496.patch,
> LUCENE-3496.patch, LUCENE-3496.patch, 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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