Adrien Grand created LUCENE-4120:
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             Summary: 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
    Affects Versions: 5.0
            Reporter: Adrien Grand
            Priority: Minor
             Fix For: 5.0


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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