[jira] [Created] (CALCITE-4236) Clarify if nulls are permissible to return from .SqlOperator#inferReturnType

["Vladimir Sitnikov (Jira)" <ji...@apache.org>]

Vladimir Sitnikov created CALCITE-4236:
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             Summary: Clarify if nulls are permissible to return from .SqlOperator#inferReturnType
                 Key: CALCITE-4236
                 URL: https://issues.apache.org/jira/browse/CALCITE-4236
             Project: Calcite
          Issue Type: Sub-task
          Components: core
    Affects Versions: 1.25.0
            Reporter: Vladimir Sitnikov


1) Javadoc for {{SqlOperator#inferReturnType}} does not say if nulls are allowed
2) The default implementation throws exception if {{returnTypeInference}} is missing, and it throws exception in case {{returnTypeInference.inferReturnType(opBinding)}} returns {{null}}.
3) Some of the operators can return null. For instance, {{SqlMultisetQueryConstructor}} has {{if (...) return null}} (which might happen to be never executed)

It looks like we need to add "never null" tp the javadoc of {{SqlOperator#inferReturnType}} 




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