[teiid-issues] [JBoss JIRA] (TEIID-5281) Issue with concatenating null strings with OData translator
Ramesh Reddy (JIRA)
issues at jboss.org
Tue Mar 13 09:22:01 EDT 2018
[ https://issues.jboss.org/browse/TEIID-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13545134#comment-13545134 ]
Ramesh Reddy commented on TEIID-5281:
-------------------------------------
Do you get a parse error with "concat('string', null)"?
> 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.
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