The `CreateRowPolicyCommand` is implemented with overriding `run()` method.
So when executing `create row policy` in non-master FE, and forward it to Master FE,
it will call `execute(TUniqueId queryId)` method and go through `executeByNereids()`.
And because without `run()` method, it will do nothing and return OK.
So after `show row policy`, user will get empty result.
This PR fix it by implmenting the `run()` method but throw an Exception, so that it will
fallback to old planner, to do the creating row policy command normally.
The full implement of `run()` method should be implemented later.
This is just a tmp fix.
301a1d97e1