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

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

Sebastian Nagel (Jira)

    [ https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892995#action_12892995 ]

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

I ran tests, each one of Mike's optimizations speed up the encode...

I think I agree with not unrolling the 4-byte, the "diff" from the previous character has to be > 187659 [0x2dd0b]
this is like pottery writings and oracle bone script... but the previous ones (2x, 3x) speed up CJK and other scripts and are very useful.


> 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-1779.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799.patch, LUCENE-1799_big.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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