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https://issues.apache.org/jira/browse/SOLR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009665#comment-13009665
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Toke Eskildsen commented on SOLR-2396:
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The JavaDoc for CollationKey is very explicit about the null-termination, but I
do not know enough about the inner workings to judge whether a concatenation
would work in all cases.
> add [ICU]CollationField
> -----------------------
>
> Key: SOLR-2396
> URL: https://issues.apache.org/jira/browse/SOLR-2396
> Project: Solr
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: SOLR-2396.patch, SOLR-2396.patch, SOLR-2396.patch,
> SOLR-2396.patch
>
>
> In LUCENE-2551 collation support was changed to use byte[] keys.
> Previously it encoded sort keys with IndexableBinaryString into char[],
> but this is wasteful with regards to RAM and disk when terms can be byte.
> A better solution would be [ICU]CollationFieldTypes, as this would also allow
> locale-sensitive range queries.
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