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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2972) Update or select with function in the where clause causes with TERRITORY_BASED collation fails with ERROR 42818: Comparisons between 'VARCHAR' and 'VARCHAR' are not supported.
Date Tue, 11 Sep 2007 22:08:35 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12526619
] 

Daniel John Debrunner commented on DERBY-2972:
----------------------------------------------

Well these two statements are *not* equivalent:

[in any system schema]
select * from SYSCS_DIAG.LOCK_TABLE where tablename = 'LOCKFUNCTESTTABLE'

[in a user schema in a territory based collation database]
select * from SYSCS_DIAG.LOCK_TABLE where CAST(tablename as VARCHAR(128))= 'LOCKFUNCTESTTABLE'

The equality predicate for the first statement matches the comparison rules Derby uses for
SQL identifiers.

The equality predicate for the second statement doesn't match  the comparison rules Derby
uses for SQL identifiers.

For any query in a test maybe the difference doesn't matter, but for recommending the correct
approach for users it does.

Note that using parameter markers makes this problem go away, since the equality will match
how Derby looks up SQL identifiers.:

select * from SYSCS_DIAG.LOCK_TABLE where tablename = ?





> Update or select with function in the where clause causes with TERRITORY_BASED collation
fails with ERROR 42818: Comparisons between 'VARCHAR' and 'VARCHAR' are not supported.
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2972
>                 URL: https://issues.apache.org/jira/browse/DERBY-2972
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>         Attachments: derby-2972_diff.txt, derby-2972_stat.txt, derby_2972_diff.txt, derby_2972_stat.txt,
tempFunction_diff.txt, tempFunction_stat.txt
>
>
> The following update fails with ERROR 42818
> ij> update testing set a = PADSTRING('aa',2024) where a = PADSTRING('a',2024);
> ERROR 42818: Comparisons between 'VARCHAR' and 'VARCHAR' are not supported.
> See full script below 
> onnect 'jdbc:derby:nordb;territory=no_NO;collation=TERRITORY_BASED';
> CREATE FUNCTION  PADSTRING (DATA VARCHAR(32000), LENGTH INTEGER) RETURNS VARCHAR(32000)
EXTERNAL NAME 'org.apache.derbyTesting.functionTests.util.Formatters.padString' LANGUAGE JAVA
PARAMETER STYLE JAVA;
> create table testing 
> 	(a varchar(2024), b varchar(1024), c varchar(1024), d varchar(2048), e varchar(300))
;
> -- insert 9 rows into the table
> insert into testing values (PADSTRING('1',2024),  PADSTRING('2',1024), 
>        PADSTRING('3',1024), PADSTRING('4',2048),  PADSTRING('5',300));
> insert into testing values (PADSTRING('10',2024),  
>        PADSTRING('20',1024), PADSTRING('30',1024), 
>        PADSTRING('40',2048), PADSTRING('50',300));
> insert into testing values (PADSTRING('100',2024),  
>        PADSTRING('200',1024), PADSTRING('300',1024), 
>        PADSTRING('400',2048), PADSTRING('500',300));
> insert into testing values (PADSTRING('1000',2024),  
>        PADSTRING('2000',1024), PADSTRING('3000',1024), 
>        PADSTRING('4000',2048), PADSTRING('5000',300));
> insert into testing values (PADSTRING('10000',2024),  
>        PADSTRING('20000',1024),	PADSTRING('30000',1024), 
>        PADSTRING('40000',2048), PADSTRING('50000',300));
> insert into testing values (PADSTRING('100000',2024), 
>        PADSTRING('200000',1024), PADSTRING('300000',1024), 
>        PADSTRING('400000',2048), PADSTRING('500000',300));
> insert into testing values (PADSTRING('1000000',2024), 
>        PADSTRING('2000000',1024), PADSTRING('3000000',1024), 
>        PADSTRING('4000000',2048), PADSTRING('5000000',300));
> insert into testing values (PADSTRING('10000000',2024), 
>        PADSTRING('20000000',1024), PADSTRING('30000000',1024), 
>        PADSTRING('40000000',2048), PADSTRING('50000000',300));
> insert into testing values (PADSTRING('100000000',2024), 
>        PADSTRING('200000000',1024), PADSTRING('300000000',1024), 
>        PADSTRING('400000000',2048), PADSTRING('500000000',300));
> update testing set a = PADSTRING('aa',2024) where a = PADSTRING('a',2024);

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