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https://issues.apache.org/jira/browse/LUCENE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated LUCENE-3972:
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Attachment: LUCENE-3972.patch
Tested the current patch on a index containing 10M documents that has ~5M
unique groups. The already existing implementation needs ~15.3 seconds to get
the total group count and the new impl in the patch needs ~4.4 seconds to get
the total group count.
> Improve AllGroupsCollector implementations
> ------------------------------------------
>
> Key: LUCENE-3972
> URL: https://issues.apache.org/jira/browse/LUCENE-3972
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/grouping
> Reporter: Martijn van Groningen
> Attachments: LUCENE-3972.patch, LUCENE-3972.patch
>
>
> I think that the performance of TermAllGroupsCollectorm,
> DVAllGroupsCollector.BR and DVAllGroupsCollector.SortedBR can be improved by
> using BytesRefHash to store the groups instead of an ArrayList.
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