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From "Paul Elschot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1410) PFOR implementation
Date Mon, 15 Feb 2010 17:29:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833895#action_12833895
] 

Paul Elschot commented on LUCENE-1410:
--------------------------------------

That might indeed be a bug.
In general the frameBitsForCompression() method should try and find the number that has the
quickest decompression.
The trade off is between exceptions taking extra time, and a smaller number of frame bits
taking less time.
I have not timed the exception decoding yet, so I would not expect the current implementation
of frameBitsForCompression() to be right on the spot.

Please note that I'd still like to change the exception encoding, see the comment of 12 May
2009:
"For an exception, we store its lower b bits instead of the offset to the next exception in
its corresponding slot, while we store the higher overflow bits and the offset in two separate
arrays. These two arrays are compressed using the Simple16 method."


> PFOR implementation
> -------------------
>
>                 Key: LUCENE-1410
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1410
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Other
>            Reporter: Paul Elschot
>            Priority: Minor
>         Attachments: autogen.tgz, LUCENE-1410-codecs.tar.bz2, LUCENE-1410b.patch, LUCENE-1410c.patch,
LUCENE-1410d.patch, LUCENE-1410e.patch, TermQueryTests.tgz, TestPFor2.java, TestPFor2.java,
TestPFor2.java
>
>   Original Estimate: 21840h
>  Remaining Estimate: 21840h
>
> Implementation of Patched Frame of Reference.

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