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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4239) Provide access to PackedInts' low-level blocks <-> values conversion methods
Date Thu, 19 Jul 2012 23:59:34 GMT
Adrien Grand created LUCENE-4239:
------------------------------------

             Summary: 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


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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