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From "Paul Elschot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2886) Adaptive Frame Of Reference
Date Fri, 04 Feb 2011 17:24:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990634#comment-12990634
] 

Paul Elschot commented on LUCENE-2886:
--------------------------------------

On the facility for allOnes in AFOR-3: one of the reasons why this appears to be of rather
little use is that current analyzers do not index stop words. They do this for two reasons,
index size and query time, both based on VByte. With an allOnes facility the first reason
disappears almost completely, and query times can be also be guarded in other ways, for example
by checking for document frequency and then trying to fall back on digrams.
So the message is: please keep this in.


> Adaptive Frame Of Reference 
> ----------------------------
>
>                 Key: LUCENE-2886
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2886
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Codecs
>            Reporter: Renaud Delbru
>             Fix For: 4.0
>
>         Attachments: LUCENE-2886_simple64.patch, LUCENE-2886_simple64_varint.patch, lucene-afor.tar.gz
>
>
> We could test the implementation of the Adaptive Frame Of Reference [1] on the lucene-4.0
branch.
> I am providing the source code of its implementation. Some work needs to be done, as
this implementation is working on the old lucene-1458 branch. 
> I will attach a tarball containing a running version (with tests) of the AFOR implementation,
as well as the implementations of PFOR and of Simple64 (simple family codec working on 64bits
word) that has been used in the experiments in [1].
> [1] http://www.deri.ie/fileadmin/documents/deri-tr-afor.pdf

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