Resolve outer reference columns #5571
Description
Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Continue the work described in this design doc.
https://docs.google.com/document/d/1j5vHyva-T_5l3POnHSS0-r5TOp86sEkfSUcRLqJZaK4/edit#heading=h.wgtywgh0byuf
Describe the solution you'd like
Describe alternatives you've considered
Additional context