[teiid-issues] [JBoss JIRA] (TEIID-5281) Issue with concatenating null strings with OData translator

[Jan Martiska (JIRA)]

Jan Martiska created TEIID-5281:
-----------------------------------

             Summary: Issue with concatenating null strings with OData translator
                 Key: TEIID-5281
                 URL: https://issues.jboss.org/browse/TEIID-5281
             Project: Teiid
          Issue Type: Bug
          Components: OData
    Affects Versions: 8.12.11.6_4
            Reporter: Jan Martiska
            Assignee: Steven Hawkins
            Priority: Minor


There is a difference in behavior of {{CONCAT(x,y)}} function in Teiid SQL and the {{concat(x,y)}} filtering function in OData - the SQL function will return null if one of the arguments is null, but the OData function will return the non-null argument in this case.

This leads to some peculiar behavior that for rows where A='10' and B=null, the query

{noformat}
SELECT concat(A, B) = '10' 
FROM BQT1.SmallA 
WHERE concat(A, B) = '10';
{noformat}

will return a row containing {{false}}, because the expression in the SELECT clause will be evaluated by Teiid, whereas the one in the WHERE clause will be evaluated by the OData {{concat}} function.

This is against the documented behavior of Teiid's {{CONCAT}} function, because such row should not be returned at all.



--
This message was sent by Atlassian JIRA
(v7.5.0#75005)