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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2426) change sort order to binary order
Date Tue, 22 Jun 2010 00:34:54 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880974#action_12880974
] 

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

How to deal with Term? 

I really don't like that Term.compareTo uses String.compareTo, for example MultiTermQuery
uses this in TopTermsBooleanQueryRewrite for comparing terms in its priority queue. 

I don't think it should block this patch either, but we should at least open a second issue
to figure out what to do about this.
Term needs to either go away, or use BytesRef w/ the codec's comparator in cases like this,
or some things like FuzzyQuery will be technically wrong (i should add a test for this too,
I think)


> 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: 3.1
>            Reporter: Robert Muir
>             Fix For: 4.0
>
>         Attachments: LUCENE-2426.patch, LUCENE-2426.patch, LUCENE-2426_automaton.patch
>
>
> 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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