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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LUCENE-4609) Writer a PackedIntsEncoder/Decoder for facets
Date Mon, 10 Dec 2012 17:05:21 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528068#comment-13528068
] 

Adrien Grand edited comment on LUCENE-4609 at 12/10/12 5:04 PM:
----------------------------------------------------------------

I just looked at IntDecoder/IntEncoder and wrapping a PackedInts ReaderIterator/Writer (or
maybe directly a Decoder/Encoder) looks easy to implement. Don't hesitate to let me know if
you have questions regarding the PackedInts API!
                
      was (Author: jpountz):
    I just looked at Int{De,En}coder and wrapping a PackedInts ReaderIterator/Writer (or maybe
directly a Decoder/Encoder) looks easy to implement. Don't hesitate to let me know if you
have questions regarding the PackedInts API!
                  
> Writer 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
>
> 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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