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

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-1799:
--------------------------------

    Attachment: LUCENE-1799.patch

attached is a simple prototype for encoding terms as BOCU-1

So while I don't think things like wildcard, etc will work due to the nature of BOCU-1, term and phrase queries should work fine, and it maintains UTF-8 order so sorting is fine, and range queries should work once we fix TermRangeQuery to use byte.

the impl is probably a bit slow (uses charset api) as its just for playing around.

note: I didnt check the box because of the patent thing, (not sure it even applies since i use the icu impl here), but either way i dont want to involve myself with that.


> 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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