Fix conflict between simplify_expression rule and CAST expressions

[andygrove]

Describe the bug Apologies for the vague bug report but I wanted to add this to a list tracking work I need to do.

Now that CAST no longer changes the name of expressions there seem to be some side effects with simplify_expression. I am working on a repro case.

To Reproduce TBD

Expected behavior TBD

Additional context None