[teiid-issues] [JBoss JIRA] (TEIID-4391) NONDETERMINISTIC functions incorrectly optimized out of ORDER BY

[Dave Nicodemus (JIRA)]

Dave Nicodemus created TEIID-4391:
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             Summary: 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


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.



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