Adrien Grand updated LUCENE-7489:
    Attachment: LUCENE-7489.patch

Here is a prototype that passes tests. It uses the same sparse DISI as norms in 
order to be able to only store actual values. Other than that it is mostly the 
same as the old format, it doesn't leverage the fact that we have an iterator 
in order to do RLE for instance (this should be explored in a different issue I 
think). I still need to review it a bit more carefully and work on the format 

> 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
> Like Lucene70NormsFormat, it should be able to only encode actual values.

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