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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4237) Allow sorting on (Java) collation keys for non-English locales
Date Tue, 17 Oct 2017 18:47:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16208145#comment-16208145
] 

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

Github user snakhoda-sfdc commented on the issue:

    https://github.com/apache/phoenix/pull/275
  
    @JamesRTaylor Thanks for your comments. I added two further commits:
    
    199c389: This addresses your comment about the byte array comparison. You were right!
I must have got confused earlier with what was being displayed on sqlline.py not matching
the sort order.  I also added a formatter for PVarBinary because without it you simply get
a Java hash code in sqlline.py which is hard to do anything with.
    
    8cc2b5c: This adds the end-to-end tests you mentioned and also changes the unit test to
use the hex representation of the byte array to make it easier to read.


> 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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