[jira] [Created] (CALCITE-2413) RexToLixTranslator does not generate correct declaration of Methods with generic return types

[Arun Mahadevan (JIRA)]

Arun Mahadevan created CALCITE-2413:
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             Summary: RexToLixTranslator does not generate correct declaration 
of Methods with generic return types
                 Key: CALCITE-2413
                 URL: https://issues.apache.org/jira/browse/CALCITE-2413
             Project: Calcite
          Issue Type: Bug
            Reporter: Arun Mahadevan
            Assignee: Julian Hyde


We have an user defined function like below:
{code:java}
public class Identity<I> implements Function<I, I> {
  @Override
  public I apply(I i) {
    return i;
  }
}
{code}

We have a projection that applies the function twice and then the generated 
statement contains the type parameter instead of a valid Java type.

{code:java}
final I v = new Identity().apply(current[0] == null ? (String) null : 
current[0].toString());
{code}

After tracing through the code for a while it looks like the 
MethodCallExpression uses Method.getGenericType. 

https://github.com/apache/calcite/blob/master/linq4j/src/main/java/org/apache/calcite/linq4j/tree/MethodCallExpression.java#L53

I guess this should be changed to Method.getReturnType instead.





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