NONDETERMINISTIC functions incorrectly optimized out of ORDER BY ---------------------------------------------------------------- Key: TEIID-4391 URL: https://issues.jboss.org/browse/TEIID-4391 Project: Teiid Issue Type: Bug Components: Server Affects Versions: 8.13.2 Reporter: Dave Nicodemus Assignee: Steven Hawkins Fix For: 9.1, 9.0.3 The default for functions is to be deterministic, so without an argument only a single value is assumed and these functions are optimized out of ORDER BY clauses. We should be able to change this behavior by marking a function and NON-DETERMINISTIC in the VDB definition like this : CREATE FOREIGN FUNCTION F() RETURNS FLOAT OPTIONS (NAMEINSOURCE '"app1".F', DETERMINISM 'NONDETERMINISTIC'); But doing this fails to prevent the function call from being optimized out of the ORDER BY. Work arounds are to use the function in an expression that involves a table column or add a no-op parameter to the function and pass a table column.