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Posted to issues@calcite.apache.org by "Alessandro Solimando (Jira)" <ji...@apache.org> on 2021/12/02 14:11:00 UTC

[jira] [Created] (CALCITE-4917) Add test for 'IS NOT NULL(a) AND a=b' simplifies to "a=b" for UnknownAsFalse semantics

Alessandro Solimando created CALCITE-4917:
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             Summary: Add test for 'IS NOT NULL(a) AND a=b' simplifies to "a=b" for UnknownAsFalse semantics
                 Key: CALCITE-4917
                 URL: https://issues.apache.org/jira/browse/CALCITE-4917
             Project: Calcite
          Issue Type: Test
          Components: core
    Affects Versions: 1.28.0
            Reporter: Alessandro Solimando
            Assignee: Alessandro Solimando


Simplification (from _RexSimplify_ class) is mostly covered is {_}RexProgramTest{_}, a test for 
expressions of the form "IS NOT NULL(a) AND a=b" => "a=b" under the "UnknownAsFalse" semantics and not simplified under "UnknownAsUnknown" one, seems uncovered.
 
Since I had to write a test to make sure the simplification was as expected, I assume others might end up doing the same, and that the test will both act as documentation and it will also protect against regressions.



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