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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1799) Unicode compression
Date Wed, 18 Nov 2009 16:30:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779513#action_12779513
] 

Robert Muir commented on LUCENE-1799:
-------------------------------------

bq. Waiting for flexible indexing, hoping it's gonna be flexible.. 

it looked to me, at a glance that some things would still be wierd. like TermVectors aren't
"flexible" yet, so wouldn't be BOCU-1.
I do not know if in flexible indexing, it will be possible for a codec to change behavior
like this... 
maybe someone knows if this is planned eventually or not?


> 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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