[jira] [Updated] (LUCENE-4936) docvalues date compression

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-4936:
--------------------------------

    Attachment: LUCENE-4936.patch

here's my hack patch... I think we should do something for DiskDV too though... and of course add tests :)
                
> 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
>         Attachments: 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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