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https://issues.apache.org/jira/browse/LUCENE-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293513#comment-13293513
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Adrien Grand commented on LUCENE-4120:
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@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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