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https://issues.apache.org/jira/browse/LUCENE-2426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863297#action_12863297
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Michael McCandless commented on LUCENE-2426:
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Big +1 too :)
For FieldCache, we need to do LUCENE-2380 (creates a BytesRef field cache) and
switch Lucene to use it -- I'll add a dependency.
> 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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