Unicode compression
-------------------

                 Key: LUCENE-1799
                 URL: https://issues.apache.org/jira/browse/LUCENE-1799
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Store
    Affects Versions: 2.4.1
            Reporter: DM Smith
            Priority: Minor


In lucene-1793, there is the off-topic suggestion to provide compression of 
Unicode data. The motivation was a custom encoding in a Russian analyzer. The 
original supposition was that it provided a more compact index.

This led to the comment that a different or compressed encoding would be a 
generally useful feature. 

BOCU-1 was suggested as a possibility. This is a patented algorithm by IBM with 
an implementation in ICU. If Lucene provide it's own implementation a freely 
avIlable, royalty-free license would need to be obtained.

SCSU is another Unicode compression algorithm that could be used. 

An advantage of these methods is that they work on the whole of Unicode. If 
that is not needed an encoding such as iso8859-1 (or whatever covers the input) 
could be used.    



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