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https://issues.apache.org/jira/browse/LUCENE-3496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125211#comment-13125211
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Simon Willnauer commented on LUCENE-3496:
-----------------------------------------

bq. I think we need to make this (RAM vs CPU tradeoff) settable by the app, at 
indexing time?

I think we should do that. Maybe via IWC?


bq. I noticed that with BYTES_VAR_SORTED the memory usage varied a lot during 
the test execution from around 10MB to 320MB. The memory usage for 
BYTES_FIXED_SORTED is stable around 10MB.

yeah, the VAR_SORTED variant loads the ords in memory which is wrong though. 
However, LUCENE-3507 is adressing this issue.

                
> 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, 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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