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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4936) docvalues date compression
Date Mon, 22 Apr 2013 15:47:17 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638117#comment-13638117
] 

Adrien Grand commented on LUCENE-4936:
--------------------------------------

bq.  In this case should we just take bitsRequired on both sides?

Yes, this makes sense !
                
> docvalues date compression
> --------------------------
>
>                 Key: LUCENE-4936
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4936
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Robert Muir
>            Assignee: Adrien Grand
>             Fix For: 4.4
>
>         Attachments: LUCENE-4936.patch, LUCENE-4936.patch, LUCENE-4936.patch, LUCENE-4936.patch,
LUCENE-4936.patch, LUCENE-4936.patch, LUCENE-4936.patch, LUCENE-4936.patch
>
>
> DocValues fields can be very wasteful if you are storing dates (like solr's TrieDateField
does if you enable docvalues) and don't actually need all the precision: e.g. "date-only"
fields like date of birth with no time component, time fields without milliseconds precision,
and so on.
> Ideally we'd compute GCD of all the values to save space (numberOfTrailingZeros is not
really enough here), but i think we should at least look for values like 86400000, 3600000,
and 1000 to be practical.

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