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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4936) docvalues date compression
Date Tue, 16 Apr 2013 12:43:18 GMT
Robert Muir created LUCENE-4936:
-----------------------------------

             Summary: 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


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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