[CALCITE-2413] RexToLixTranslator does not generate correct declaration of Methods with generic return types - ASF JIRA

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We have an user defined function like below:

public class Identity<I> implements Function<I, I> {
  @Override
  public I apply(I i) {
    return i;
  }
}

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

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

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

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