Knut Anders Hatlen created DERBY-6032:
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Summary: 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: 10.9.1.0
Reporter: Knut Anders Hatlen
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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