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https://issues.apache.org/jira/browse/LUCENE-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293207#comment-13293207
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Robert Muir commented on LUCENE-4120:
-------------------------------------
does the change only affect packed fsts? (sorry,on mobile).
if so, its no problem. we only support unchanged lucene40 codec
as far as index back compat, and it only uses unpacked fsts.
anything else is open season
> 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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