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From "Adrien Grand (JIRA)" <>
Subject [jira] [Updated] (LUCENE-4120) FST should use packed integer arrays
Date Mon, 11 Jun 2012 23:48:42 GMT


Adrien Grand updated LUCENE-4120:

    Attachment: LUCENE-4120.patch

New patch:
 - fixed Kuromoji {{TokenInfoDictionaryBuilder}} (but you will need to run ant build-dict
to make tests pass),
 - moved {{save}} to {{Mutable}}, {{FST}} now cannot be saved if it has been loaded from disk,
 - renamed {{getWriter}} to {{getWriterByFormat}},
 - fixed docs.

FST docs say that there is no need to have backward compatibility because FSTs are experimental.
Is it still accurate? The fact that FSTs are used in {{MemoryPostingsFormat}} and Kuromoji
analyzers makes me feel that this is not true anymore (or at least won't be true anymore when
4.0 is released).
> FST should use packed integer arrays
> ------------------------------------
>                 Key: LUCENE-4120
>                 URL:
>             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, LUCENE-4120.patch
> There are some places where an int[] could be advantageously replaced with a packed integer
> 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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