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https://issues.apache.org/jira/browse/LUCENE-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-5720:
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Attachment: LUCENE-5720.patch
Updated patch: since we are using these for numerics (and in those cases high
BPV is common, e.g. floats/doubles/etc), i added 'byte' cases for bpv > 32
(40,48,56,64). I changed the upgrade logic, to try to go to byte first, then
nibble.
This means it also works like the in-ram one: if you pass FASTEST it always
goes to some multiple of a byte.
> 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
>
> Attachments: LUCENE-5720.patch, LUCENE-5720.patch, LUCENE-5720.patch
>
>
> 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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