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https://issues.apache.org/jira/browse/LUCENE-7351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-7351.
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Resolution: Fixed
Fix Version/s: 6.2
master (7.0)
> 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
> Fix For: master (7.0), 6.2
>
> Attachments: LUCENE-7351.patch, 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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