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https://issues.apache.org/jira/browse/LUCENE-7489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585546#comment-15585546
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Adrien Grand commented on LUCENE-7489:
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The only difference that I could find is that we now wrap twice instead of only
once before when gcd compression is enabled. I changed it, which yielded a ~2%
improvement on wikimedium1m. This is far from the ~8% that the nightly
benchmarks report, but it could be that the differences in the dataset explain
it. I'll keep watching this benchmark over the next days.
> Improve sparsity support of Lucene70DocValuesFormat
> ---------------------------------------------------
>
> Key: LUCENE-7489
> URL: https://issues.apache.org/jira/browse/LUCENE-7489
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: master (7.0)
>
> Attachments: LUCENE-7489.patch, LUCENE-7489.patch
>
>
> Like Lucene70NormsFormat, it should be able to only encode actual values.
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