Robert Muir created LUCENE-4936:
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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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