[jira] Created: (DERBY-2670) %a% and %aa% match too many rows in database with collation=TERRITORY_BASED and territory=no_NO

[Knut Anders Hatlen (JIRA)]

%a% and %aa% match too many rows in database with collation=TERRITORY_BASED and 
territory=no_NO
-----------------------------------------------------------------------------------------------

                 Key: DERBY-2670
                 URL: https://issues.apache.org/jira/browse/DERBY-2670
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.3.0.0
            Reporter: Knut Anders Hatlen


On a database with territory=no_NO and collation=TERRITORY_BASED, I get these 
results from a query which uses the LIKE predicate:

ij> select * from t where x like '%a%';
X                   
--------------------
Waagan              
Wåhan               
Wanvik              
Wågan               
ekstrabetaling      
ekstra­arbeid       
­a                  
a                   
-a                  
 a                  
B                   
C                   

12 rows selected

The last two rows ('B' and 'C') should not have been included in the result, 
since they do not match the pattern '%a%'.

Similar wrong results are seen with '%aa%':

ij> select * from t where x like '%aa%';
X                   
--------------------
Waagan              
ekstraarbeid        
B                   

3 rows selected

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