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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4120) FST should use packed integer arrays
Date Tue, 12 Jun 2012 11:12:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293513#comment-13293513
] 

Adrien Grand commented on LUCENE-4120:
--------------------------------------

@Robert: Yes, it only affects packed FSTs. In this case, the backward compatibility would
be rather easy to set-up (just fill a {{GrowableWriter}} instead of an {{int[]}}).

@Dawid: Thanks!
                
> 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, 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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