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Posted to dev@calcite.apache.org by "Kirill Kozlov (Jira)" <ji...@apache.org> on 2019/09/17 22:26:00 UTC

[jira] [Created] (CALCITE-3355) SQLCase nullability check

Kirill Kozlov created CALCITE-3355:
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             Summary: SQLCase nullability check
                 Key: CALCITE-3355
                 URL: https://issues.apache.org/jira/browse/CALCITE-3355
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.20.0
            Reporter: Kirill Kozlov


When executing queries like: 
"SELECT COALESCE(name, 'unknown') as name_out FROM PCOLLECTION"
(input 'name' is nullable)

There is a need to know whether the result is nullable or not (in this case - not). During validation stage "COALESCE" is being transformed (via SqlValidatorImpl.performUnconditionalRewrites) into a "CASE" statement, which currently does not determine nullability of a result.



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