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Robert Muir commented on LUCENE-1799: ------------------------------------- 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online. --------------------------------------------------------------------- To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org For additional commands, e-mail: java-dev-h...@lucene.apache.org