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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:
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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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