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https://issues.apache.org/jira/browse/LUCENE-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292885#comment-13292885
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Dawid Weiss commented on LUCENE-4120:
-------------------------------------
I looked at the patch and it looks good to me but I didn't really analyze it
in-depth. As for fst packing, the idea is fairly simple -- you reduce the
overall size of the fst by moving states which have lots incoming arcs to
offsets which compress well (in vcoding). At least I think that's what Mike
implemented (Mike is an unpredictable genius :) ).
This presentation has some details:
http://ciaa-fsmnlp-2011.univ-tours.fr/ciaa/upload/files/Weiss-Daciuk.pdf
> FST should use packed integer arrays
> ------------------------------------
>
> Key: LUCENE-4120
> URL: https://issues.apache.org/jira/browse/LUCENE-4120
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/FSTs
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.0
>
> Attachments: LUCENE-4120.patch
>
>
> There are some places where an int[] could be advantageously replaced with a
> packed integer array.
> I am thinking (at least) of:
> * FST.nodeAddress (GrowableWriter)
> * FST.inCounts (GrowableWriter)
> * FST.nodeRefToAddress (read-only Reader)
> The serialization/deserialization methods should be modified too in order to
> take advantage of PackedInts.get{Reader,Writer}.
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