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Posted to issues@lucene.apache.org by "Jim Ferenczi (Jira)" <ji...@apache.org> on 2021/03/31 11:55:00 UTC

[jira] [Updated] (LUCENE-9899) Numeric DV block compression ignores the gcd when computing the number of bits required

     [ https://issues.apache.org/jira/browse/LUCENE-9899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jim Ferenczi updated LUCENE-9899:
---------------------------------
    Status: Open  (was: Open)

> Numeric DV block compression ignores the gcd when computing the number of bits required
> ---------------------------------------------------------------------------------------
>
>                 Key: LUCENE-9899
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9899
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Jim Ferenczi
>            Priority: Major
>
> When numeric doc values are splitted per block we compute the number of bits per value [from the minimum and maximum value present in the block|https://github.com/apache/lucene/blob/d5d6dc079395c47cd6d12dcce3bcfdd2c7d9dc63/lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90DocValuesConsumer.java#L390]. However, the greatest common divisor is not taken into account so the number is overvalued for cases where it is greater than 1.
>  



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