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Date: Thu, 12 Oct 2017 21:39:00 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (PHOENIX-4237) Allow sorting on (Java) collation
 keys for non-English locales
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archived-at: Thu, 12 Oct 2017 21:39:05 -0000


    [ https://issues.apache.org/jira/browse/PHOENIX-4237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16202669#comment-16202669 ] 

ASF GitHub Bot commented on PHOENIX-4237:
-----------------------------------------

Github user JamesRTaylor commented on the issue:

    https://github.com/apache/phoenix/pull/275
  
    Thanks for the patch, @shehzaadn. This looks like a general enough built-in function to include in Phoenix IMHO. See inline for more specific comments. It'd be much better to include the first two commits as external dependencies. If we don't do that, we'll need to quickly follow up with replacing them with external dependencies (and make sure we don't change those files at all).


> Allow sorting on (Java) collation keys for non-English locales
> --------------------------------------------------------------
>
>                 Key: PHOENIX-4237
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4237
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Shehzaad Nakhoda
>             Fix For: 4.12.0
>
>
> Strings stored via Phoenix can be composed from a subset of the entire set of Unicode characters. The natural sort order for strings for different languages often differs from the order dictated by the binary representation of the characters of these strings. Java provides the idea of a Collator which given an input string and a (language) locale can generate a Collation Key which can then be used to compare strings in that natural order.
> Salesforce has recently open-sourced grammaticus. IBM has open-sourced ICU4J some time ago. These technologies can be combined to provide a robust new Phoenix function that can be used in an ORDER BY clause to sort strings according to the user's locale.


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