lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4799) Enable extraction of originating term for ICU collation keys
Date Tue, 26 Feb 2013 12:10:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587058#comment-13587058
] 

Robert Muir commented on LUCENE-4799:
-------------------------------------

{quote}
and since comparison of keys stop when a 0 is encountered, the addition of the originating
term does not affect sort order.
{quote}

Thats what won't work here and will cause things to be screwy. This may work with some comparison
function written in the C programming language, but doesn't hold here.

                
> Enable extraction of originating term for ICU collation keys
> ------------------------------------------------------------
>
>                 Key: LUCENE-4799
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4799
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/other
>    Affects Versions: 4.1
>            Reporter: Toke Eskildsen
>            Priority: Minor
>              Labels: collator, facet
>         Attachments: LUCENE-4799.patch
>
>
> By concatenating generated ICU collation keys bytes with the originating term, it is
possible to extract the originating term at a later time. This makes it possible to build
a collator sorted facet field and similar multi-value/document structures.
> ICU collation keys are guaranteed to be terminated by a 0 (https://ssl.icu-project.org/apiref/icu4j48rc1/com/ibm/icu/text/CollationKey.html)
and since comparison of keys stop when a 0 is encountered, the addition of the originating
term does not affect sort order. As 0 are _only_ used for termination in the key bytes, the
extraction of the originating term is unambiguous.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message