Michael McCandless commented on LUCENE-7474:

A sparse set in the nightly benchmarks is an interesting idea.  Do you have a 
data set in mind?

At some point I'll write up a blog post summarizing the change and I can also 
try to do a before (6.x) / after (upcoming 7.0) one-time performance test for 

> Improve doc values writers
> --------------------------
>                 Key: LUCENE-7474
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7474
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: master (7.0)
>         Attachments: LUCENE-7474.patch
> One of the goals of the new iterator-based API is to better handle sparse 
> data. However, the current doc values writers still use a dense 
> representation, and some of them perform naive linear scans in the nextDoc 
> implementation.

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