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https://issues.apache.org/jira/browse/LUCENE-6863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980418#comment-14980418
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Adrien Grand commented on LUCENE-6863:
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bq. Is it okay if we mark LUCENE-5688 and LUCENE-4921 as duplicate of this Jira
or could there still be plans on having a specialized doc value format?
I think it would be a bit premature to say the other jiras are superseded by
this one, it's not clear yet whether the proposed approach here is actually a
better idea and/or could make it to the default codec. I suggest that we wait
to see how happy benchmarks are with this patch first.
> 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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