[jira] [Created] (CALCITE-4394) When generating code for a function call, take the inferred operand type into account

["Julian Hyde (Jira)" <ji...@apache.org>]

Julian Hyde created CALCITE-4394:
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             Summary: When generating code for a function call, take the inferred operand type into account
                 Key: CALCITE-4394
                 URL: https://issues.apache.org/jira/browse/CALCITE-4394
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde


When generating code for a function call, take the inferred operand type into account. If we don't do this, the Java code we generate for {{CONCAT(CAST(NULL AS ANY), 'x')}} does not compile, because the first parameter is of type Object; it needs to be String (based on the inferred operand type of VARCHAR).

We achieve this by using {{SqlOperator.operandTypeInference}} at validate time, storing the list of inferred operand types for the call, then using that list (if available) during code generation.



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