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https://issues.apache.org/jira/browse/LUCENE-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574484#comment-13574484
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Shai Erera commented on LUCENE-4609:
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Well ... this encoding may be better if really you had many more values in the
range 128-256 (which w/ vint are encoded w/ 2 bytes). But that seems arbitrary
.. why those values?
I am not sure if we should keep this encoder, b/c it consumes more space and
even in EncodingSpeed, which indexes categories that are very close to each
other, vint achieved slightly better compression.
I am not sure anymore that for an arbitrary set of integers, we can do better
than VInt (well, just b/c of all the attempts we've had :)).
> Write a PackedIntsEncoder/Decoder for facets
> --------------------------------------------
>
> Key: LUCENE-4609
> URL: https://issues.apache.org/jira/browse/LUCENE-4609
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Shai Erera
> Priority: Minor
> Attachments: LUCENE-4609.patch, LUCENE-4609.patch, LUCENE-4609.patch,
> LUCENE-4609.patch, LUCENE-4609.patch, SemiPackedEncoder.patch
>
>
> Today the facets API lets you write IntEncoder/Decoder to encode/decode the
> category ordinals. We have several such encoders, including VInt (default),
> and block encoders.
> It would be interesting to implement and benchmark a
> PackedIntsEncoder/Decoder, with potentially two variants: (1) receives
> bitsPerValue up front, when you e.g. know that you have a small taxonomy and
> the max value you can see and (2) one that decides for each doc on the
> optimal bitsPerValue, writes it as a header in the byte[] or something.
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