Adrien Grand commented on LUCENE-7489:

Thanks for reporting this seed, I'll look into this bug.

bq. It looks like it uses the same compression techniques for the values as the 
6.x codec, but then for "which docIDs have a value" it has three different 
approaches, for the very sparse, mostly dense, and 100% dense cases.

This is correct.

> 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
>         Attachments: LUCENE-7489.patch, LUCENE-7489.patch
> Like Lucene70NormsFormat, it should be able to only encode actual values.

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