Robert Muir created LUCENE-5720:
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             Summary: Optimize on disk packed integers part 2
                 Key: LUCENE-5720
                 URL: https://issues.apache.org/jira/browse/LUCENE-5720
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Robert Muir
             Fix For: 4.9, 5.0


These are heavily optimized for the in-RAM case (for example FieldCache uses 
PackedInts.FAST to make it even faster so), but for the docvalues case they are 
not: we always essentially use COMPACT, we have only one decoder that must 
solve all the cases, even the complicated ones, we use BlockPackedWriter for 
all integers (even if they are ordinals), etc.




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