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https://issues.apache.org/jira/browse/LUCENE-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635444#comment-13635444
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Uwe Schindler commented on LUCENE-4936:
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bq. But NumericField is totally unrelated to docvalues!
Thats clear. I just said, if you use a LONG docvalues field and store the long
epoch its always timezone-less. That was what I wanted to say. This applies to
Solr, too.
> 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
> Attachments: 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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