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https://issues.apache.org/jira/browse/JENA-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15966499#comment-15966499
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ASF GitHub Bot commented on JENA-1313:
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Github user afs commented on the issue:
https://github.com/apache/jena/pull/237
The collator is applied multiple times so if there is a mixed set of
lang-tagged-literals this is inconsistent. It only applies to a
same-lang,same-lang comparison while it may also be called with same first
argument but different, different-lang argument at some other point in the sort.
[Earlier
email](https://lists.apache.org/thread.html/bae6f297200bee71bf749612f25e5a6f55d6a44c9c79b7240435d05a@%3Cusers.jena.apache.org%3E)
This runs into the problem of unstable sorts or Java sort crashing out.
We need to switch to sorting by an ordering of (lang, lex), not (lex,
lang), not just reorder within same-lang.
> Language-specific collation in ARQ
> ----------------------------------
>
> Key: JENA-1313
> URL: https://issues.apache.org/jira/browse/JENA-1313
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ
> Affects Versions: Jena 3.2.0
> Reporter: Osma Suominen
>
> As [discussed|http://markmail.org/message/v2bvsnsza5ksl2cv] on the users
> mailing list in October 2016, I would like to change ARQ collation of literal
> values to be language-aware and respect language-specific collation rules.
> This would probably involve changing at least the
> [NodeUtils.compareLiteralsBySyntax|https://github.com/apache/jena/blob/master/jena-arq/src/main/java/org/apache/jena/sparql/util/NodeUtils.java#L199]
> method.
> It currently sorts by lexical value first, then by language tag. Since the
> collation order needs to be stable across all possible literal values, I
> think the safest way would be to sort by language tag first, then by lexical
> value according to the collation rules for that language.
> But what about subtags like {{@en-US}} or {{@pt-BR}}? Can they have different
> collation rules than the main language? It would be a bit strange if all
> {{@en-US}} literals sorted after {{@en}} literals...
> It would be good to check how Dydra does this and possibly take the same
> approach. See the message linked above for further backgound.
> I've been talking with [~kinow] about this and he may be interested in
> implementing it.
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