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[jira] [Created] (FLINK-10438) Built in functions should document the returned types


Piotr Nowojski created FLINK-10438:
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             Summary: Built in functions should document the returned types
                 Key: FLINK-10438
                 URL: https://issues.apache.org/jira/browse/FLINK-10438
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
    Affects Versions: 1.6.1
            Reporter: Piotr Nowojski


As it is now, user have no idea to know whether the result of the operation is accurate or not.

For example {{POWER(4, 2)}} or {{POWER(2.5, )}} could return exact results (with proper {{DECIMAL}}  support), while it seems like now they are returning approximated result (because of {{DOUBLE}} arithmetic). Same applies to other arithmetic functions, like {{COS SIN ATAN LOG ...}}.

Such behaviour should be documented. In some cases documenting the argument types also might be important.



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