Adrien Grand commented on LUCENE-7489:

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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