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https://issues.apache.org/jira/browse/LUCENE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762742#action_12762742
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Eks Dev commented on LUCENE-1410:
---------------------------------
Mike,
That is definitely the way to go, distribution dependent encoding, where every
Term gets individual treatment.
Take for an example simple, but not all that rare case where Index gets sorted
on some of the indexed fields (we use it really extensively, e.g. presorted doc
collection on user_rights/zip/city, all indexed). There you get perfectly
"compressible" postings by simply managing intervals of set bits. Updates
distort this picture, but we rebuild index periodically and all gets good
again. At the moment we load them into RAM as Filters in IntervalSets. if that
would be possible in lucene, we wouldn't bother with Filters (VInt decoding on
such super dense fields was killing us, even in RAMDirectory) ...
Thinking about your comments, isn't pulsing somewhat orthogonal to packing
method? For example, if you load index into RAMDirecectory, one could avoid one
indirection level and inline all postings.
Flex Indexing rocks, that is going to be the most important addition to lucene
since it started (imo)... I would even bet on double search speed in first
attempt for average queries :)
Cheers,
eks
> 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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