Kirill Kozlov created CALCITE-3355:

             Summary: SQLCase nullability check
                 Key: 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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