xmlagg should return null rather than empty over no values ---------------------------------------------------------- Key: TEIID-5570 URL: https://issues.jboss.org/browse/TEIID-5570 Project: Teiid Issue Type: Bug Components: Query Engine Reporter: Steven Hawkins Assignee: Steven Hawkins Priority: Major Fix For: 11.1.2, 12.0, 11.2.2 For example the query: select string_agg(col, ',') from (select cast(null as string) as col) x Should return null rather than an empty string.