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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