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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