[jira] [Resolved] (LUCENE-7351) BKDWriter should compress doc ids when all values in a block are the same

["Adrien Grand (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand resolved LUCENE-7351.
----------------------------------
       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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