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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4239) Provide access to PackedInts' low-level blocks <-> values conversion methods
Date Sat, 21 Jul 2012 19:45:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419917#comment-13419917
] 

Adrien Grand commented on LUCENE-4239:
--------------------------------------

I just committed. Let's see how we can improve it!
                
> Provide access to PackedInts' low-level blocks <-> values conversion methods
> ----------------------------------------------------------------------------
>
>                 Key: LUCENE-4239
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4239
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/other
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-4239.patch
>
>
> In LUCENE-4161 we started to make the {{PackedInts}} API more flexible so that codecs
could use it whenever they need to (un)pack integers. There are two posting formats in progress
(For and PFor, LUCENE-3892) that perform a lot of integer (un)packing but the current API
still has limits :
>  - it only works with long[] arrays, whereas these codecs need to manipulate int[] arrays,
>  - the packed reader iterators work great for unpacking long sequences of integers, but
they would probably cause a lot of overhead to decode lots of short integer sequences such
as the ones that can be generated by For and PFor.
> I've been looking at the For/PFor branch and it has a {{PackedIntsDecompress}} class
(http://svn.apache.org/repos/asf/lucene/dev/branches/pforcodec_3892/lucene/core/src/java/org/apache/lucene/codecs/pfor/PackedIntsDecompress.java)
which is very similar to {{oal.util.packed.BulkOperation}} (package-private), so maybe we
should find a way to expose this class so that the For/PFor branch can directly use it.

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