support column operators (_ceq, etc) in permission rules to reference other tables #3459
Description
In permissions, column operators like _ceq, _cgt can only refer to the "currently selected" table i.e. we can do {table1.c1 : { _ceq : table1.c2}} .
We should look at supporting spanning across other tables like: {table1.c1 : { _ceq : table2.c3}} .