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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2866) Improve error message when comparing user table and system table columns if collation doesn't match
Date Fri, 22 Jun 2007 22:47:25 GMT
Improve error message when comparing user table and system table columns if collation doesn't
match
---------------------------------------------------------------------------------------------------

                 Key: DERBY-2866
                 URL: https://issues.apache.org/jira/browse/DERBY-2866
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 10.3.1.0
            Reporter: Kathey Marsden
            Priority: Minor


If I create a database with TERRITORY_BASED collation and try to do a comparison between a
user table column and a system table column, I get the following message.  If I create it
with UCS_BASIC collation there is no problem with the query.  It makes sense to me that I
can't compare these columns but I think it  would be worthwhile to make a more informative
error message since in fact normally comparisons between VARCHAR and VARCHAR are supported,
just not comparisons between TERRITORY_BASED and UCS_BASIC.

Kathey

ij> connect 'jdbc:derby:enusdb;create=true;territory=en_US;collation=TERRITORY_BASED';
ij(CONNECTION1)> create table t (vc varchar(30));
0 rows inserted/updated/deleted
ij(CONNECTION1)> insert into t values('t');
1 row inserted/updated/deleted
ij(CONNECTION1)> select tableName, vc from sys.systables, t  where vc = tableName;
ERROR 42818: Comparisons between 'VARCHAR' and 'VARCHAR' are not supported.


Bryan suggests ...

Can we make it say something like:

ERROR 42818: Comparisons between 'VARCHAR(en_US)' and 'VARCHAR(UCS_BASIC)' are not supported.

That is, sort of pack the collation information into the datatype
name somehow?



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