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Date: Sun, 2 May 2010 10:34:55 -0400 (EDT)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2426) change sort order to binary order
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    [ https://issues.apache.org/jira/browse/LUCENE-2426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863137#action_12863137 ] 

Robert Muir commented on LUCENE-2426:
-------------------------------------

by the way: as mentioned above, as far as numerics and collation goes, 
both of these today avoid any of the parts of unicode that are sensitive to such a sort order change.

So these already "backwards compatible" in the sense that numeric fields or 
collated fields will sort the same way in either UTF-8/UTF-32 byte[] order or UTF-16 char[] order.


> change sort order to binary order
> ---------------------------------
>
>                 Key: LUCENE-2426
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2426
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 4.0.0
>            Reporter: Robert Muir
>             Fix For: 4.0.0
>
>
> Since flexible indexing, terms are now represented as byte[], but for backwards compatibility reasons, they are not sorted as byte[], but instead as if they were char[].
> I think its time to look at sorting terms as byte[]... this would yield the following improvements:
> * terms are more opaque by default, they are byte[] and sort as byte[]. I think this would make lucene friendlier to customizations.
> * numerics and collation are then free to use their own encoding (full byte) rather than avoiding the use of certain bits to remain compatible with char[] sort order.
> * automaton gets simpler because as in LUCENE-2265, it uses byte[] too, and has special hacks because terms are sorted as char[]

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