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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4609) Write a PackedIntsEncoder/Decoder for facets
Date Fri, 21 Dec 2012 15:39:12 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13538143#comment-13538143
] 

Adrien Grand commented on LUCENE-4609:
--------------------------------------

Gilad, I created LUCENE-4643 which I assume should be better than PackedInts.Writer and PackedInts.ReaderIterator
for your use-case? It doesn't write heavyweight headers (meaning that you need to know the
PackedInts version and the size of the stream otherwise) and encodes data in fixed-size blocks.
                
> 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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