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https://issues.apache.org/jira/browse/DERBY-6032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Pendleton reassigned DERBY-6032:
--------------------------------------
Assignee: Kasun Prabath Amarasinghe
> Concatenation operator confuses collation
> -----------------------------------------
>
> Key: DERBY-6032
> URL: https://issues.apache.org/jira/browse/DERBY-6032
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.7.1.1, 10.8.1.2, 10.8.2.2, 10.8.3.0, 10.9.1.0,
> 10.10.1.1
> Reporter: Knut Anders Hatlen
> Assignee: Kasun Prabath Amarasinghe
> Labels: derby_triage10_11
>
> Given this table:
> ij> connect
> 'jdbc:derby:memory:db;territory=en;collation=TERRITORY_BASED;create=true';
> ij> create table t(x varchar(10));
> 0 rows inserted/updated/deleted
> ij> insert into t values 'a' || 'b';
> 1 row inserted/updated/deleted
> The following query works:
> ij> select * from t where x = 'ab';
> X
> ----------
> ab
> 1 row selected
> However, if the string is generated with the concatenation operator, an
> exception is thrown:
> ij> select * from t where x = 'a' || 'b';
> ERROR 42818: Comparisons between 'VARCHAR (TERRITORY_BASED)' and 'CHAR
> (UCS_BASIC)' are not supported. Types must be comparable. String types must
> also have matching collation. If collation does not match, a possible
> solution is to cast operands to force them to the default collation (e.g.
> SELECT tablename FROM sys.systables WHERE CAST(tablename AS VARCHAR(128)) =
> 'T1')
> I'd expect the two queries to be equivalent.
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