[jira] Commented: (LUCENE-1799) Unicode compression

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[jira] Commented: (LUCENE-1799) Unicode compression

JIRA jira@apache.org

    [ https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890415#action_12890415 ]

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

Uwe, sure, if we were to implement this I wouldnt use NIO anyway though, like i said i dont plan on committing anything (unless somethign is figured out about the patent), but it might be useful to someone.

I tested this on some hindi text:
||encoding||tii||tis||
|utf-8|60,205|3,740,329|
|bocu-1|28,431|2,168,407|

> 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
>         Attachments: LUCENE-1799.patch
>
>
> 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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