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https://issues.apache.org/jira/browse/DERBY-3975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen closed DERBY-3975.
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> SELECT DISTINCT may return duplicates with territory-based collation
> --------------------------------------------------------------------
>
> Key: DERBY-3975
> URL: https://issues.apache.org/jira/browse/DERBY-3975
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.3.1.4, 10.4.2.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Fix For: 10.3.3.1, 10.4.2.1, 10.5.0.0
>
> Attachments: AisBCollatorProvider.java, derby-3975-1a.diff,
> derby-3975-1a.stat
>
>
> I defined my own locale (en_US_aisb) where the collation rules said that a=b.
> When I tried queries with SELECT DISTINCT, they didn't always eliminate all
> duplicates. Here's an example:
> ij> connect
> 'jdbc:derby:db;create=true;territory=en_US_aisb;collation=TERRITORY_BASED';
> ij> create table t (x varchar(10));
> 0 rows inserted/updated/deleted
> ij> insert into t values 'a','b','abba','baab','ABBA';
> 5 rows inserted/updated/deleted
> ij> select distinct * from t;
> X
> ----------
> ABBA
> b
> a
> abba
> 4 rows selected
> ij> select distinct * from t order by x;
> X
> ----------
> a
> abba
> ABBA
> 3 rows selected
> The first query did eliminate the duplicate "abba"/"baab", but it did not
> eliminate the duplicate "a"/"b". When an ORDER BY clause was added (the
> second query), all the duplicates were eliminated.
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