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https://issues.apache.org/jira/browse/LUCENE-7351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15357388#comment-15357388
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Robert Muir commented on LUCENE-7351:
-------------------------------------
I like this better than the last patch, I think the optimization is more
general.
I think in the base test class, {{tesMostEqual()}} is a mistake?
> BKDWriter should compress doc ids when all values in a block are the same
> -------------------------------------------------------------------------
>
> Key: LUCENE-7351
> URL: https://issues.apache.org/jira/browse/LUCENE-7351
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7351.patch, LUCENE-7351.patch
>
>
> BKDWriter writes doc ids using 4 bytes per document. I think it should
> compress similarly to postings when all docs in a block have the same packed
> value. This can happen either when a field has a default value which is
> common across documents or when quantization makes the number of unique
> values so small that a large index will necessarily have blocks that all
> contain the same value (eg. there are only 63490 unique half-float values).
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