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  1. Teiid
  2. TEIID-4391

NONDETERMINISTIC functions incorrectly optimized out of ORDER BY

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    Details

    • Type: Bug
    • Status: Resolved (View Workflow)
    • Priority: Major
    • Resolution: Done
    • Affects Version/s: 8.13.2
    • Fix Version/s: 9.1, 9.0.3
    • Component/s: Server
    • Labels:
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      Description

      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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            Assignee:
            shawkins Steven Hawkins
            Reporter:
            dnicodemus Dave Nicodemus (Inactive)
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              Updated:
              Resolved: