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https://issues.apache.org/jira/browse/LUCENE-6863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979601#comment-14979601
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Yonik Seeley commented on LUCENE-6863:
--------------------------------------

bq. It was just a start so that I could easily trigger usage of this 
compression in tests.

Adding a small constant always helps with test coverage... (n*0.05 + 5) for 
example.


> Store sparse doc values more efficiently
> ----------------------------------------
>
>                 Key: LUCENE-6863
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6863
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>         Attachments: LUCENE-6863.patch
>
>
> For both NUMERIC fields and ordinals of SORTED fields, we store data in a 
> dense way. As a consequence, if you have only 1000 documents out of 1B that 
> have a value, and 8 bits are required to store those 1000 numbers, we will 
> not require 1KB of storage, but 1GB.
> I suspect this mostly happens in abuse cases, but still it's a pity that we 
> explode storage requirements. We could try to detect sparsity and compress 
> accordingly.



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