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

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-5281.
-----------------------------------
    Fix Version/s: 10.0.4
                   10.2
                   10.1.2
       Resolution: Done


Updated the sql generation for concat and substring.

> 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
>             Fix For: 10.0.4, 10.2, 10.1.2
>
>
> 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.



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