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https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779442#action_12779442
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Robert Muir commented on LUCENE-1799:
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Earwin, if implemented as a directory, we lose many of the advantages.
For example, if you are using BOCU-1, lets say with Hindi language, then
according to the stats here: http://unicode.org/notes/tn6/#Performance
* you can encode/decode BOCU-1 to/from UTF-16 more than twice as fast as you
can UTF-8 to/from UTF-16 (for this language)
* also, resulting bytes are less than half the size of UTF-8 (for this
language), yet sort order is still preserved, so it should work for term
dictionary, etc.
Note: I have never measured bocu performance in practice.
I took a look at the flex indexing branch and this appears like this might be
possible in the future thru a codec...
> 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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