Order by is omitted when projection is raised above ordering with grouping -------------------------------------------------------------------------- Key: TEIID-2568 URL: https://issues.jboss.org/browse/TEIID-2568 Project: Teiid Issue Type: Bug Components: Query Engine Affects Versions: 7.7 Environment: Windows and teiid 8.1 Reporter: RAKESH BALGURI Assignee: Steven Hawkins Priority: Critical Fix For: 8.4.1, 8.5 Attachments: Query_Plan_SQL_1.txt, Query_Plan_SQL_2.txt I have a SQL which contain constants in the Select clause and also it contains Group By, Order By and Limit clauses in the SQL. When I execute the SQL, the Order By clause is not being pushed to the underlying translator. My translator doesn't support "SelectExpressions" i.e. supportsSelectExpression() returns false. When I remove the constant from the Select clause then the Order By is pushed to the translator. Is this a bug in Teiid's query Optimizer? The following are the sample queries and attached are the Query Plans for both the SQL's. Query1: This SQL doesn't push the Order By clause to the translator. SELECT B.RESCLASS, COUNT(*) AS GROUPING_COUNT, 'SECURITY.BASERULE' AS "__objecttype__" FROM SECURITY.BASERULE AS B GROUP BY B.RESCLASS ORDER BY B.RESCLASS DESC LIMIT 22 Query2: This SQL pushes the Order By to the translator. SELECT B.RESCLASS, COUNT(*) AS GROUPING_COUNT FROM SECURITY.BASERULE AS B GROUP BY B.RESCLASS ORDER BY B.RESCLASS DESC LIMIT 22