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.