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https://issues.apache.org/jira/browse/LUCENE-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13536384#comment-13536384
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Gilad Barkai commented on LUCENE-4609:
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bq. Hopefully you don't need to separately encode "leftover unused bits" ... ie
byte[].length (which is "free" here, since codec already stores this) should
suffice.
I'm missing something.. if there are 2 bits per value, and the codec knows its
only 1 byte, there could be either 1, 2, 3 or 4 values in that single byte. How
could the decoder know when to stop without knowing how many bits should not be
encoded at the end?
> 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
>
>
> 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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