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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2668) At the time of compilation of a comparison operation, if the collation types of the operands do not match, then we should throw a meaningful error message.
Date Fri, 18 May 2007 06:25:16 GMT
At the time of compilation of a comparison operation, if the collation types of the operands
do not match, then we should throw a meaningful error message.
-----------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: DERBY-2668
                 URL: https://issues.apache.org/jira/browse/DERBY-2668
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 10.3.0.0
            Reporter: Mamta A. Satoor


In Derby 10.3, we are adding a new feature (DERBY-1478) which will allow character string
types to have a territory based collation (except for persistent character string type columns
from system schema). When 2 character types are compared, they should have the same collation
type associated with them. If not then Derby 10.3 will throw an exception. Currently, in Derby
10.3 codeline, the exception thrown is something like "ERROR 42818: Comparisons between 'VARCHAR'
and 'CHAR' are not supported." but this error message is misleading. The error is really for
collation mismatch. We should fix following error so it indicates the real reason behind the
exception.

eg sql
ij> connect 'nodb;create=true;territory=no;collation=TERRITORY_BASED'; 
ij> select * from sys.systables where tablename = 'T1'; 
ERROR 42818: Comparisons between 'VARCHAR' and 'CHAR' are not supported. 


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