ProjectRemoveRule checking RelNode type

[Jess Balint]

Hi,
I used ProjectRemoveRule, but it's not working. When debugging, I arrive at
this code:

Project project = call.rel(0);
RelNode stripped = project.getInput();
if (stripped instanceof Project) {

The *stripped* object here is an instance of *HepRelVertex* and therefore
this code does not recognize the child as a projection and loses the field
names. How should this be reconciled?

Thanks.
Jess