Clarification on UNIQUE constraints for column combinations.

[LITONG99]

Dear authors, thank you for this remarkable work and for sharing the collected data.

I notice that the UNIQUE constraint is stored as a Boolean value under a specific column. For example, Name['UNIQUE']=True.
Could you please help to clarify how you handled UNIQUE constraints for column combinations when collecting the data? Are they filtered out?
For example, UNIQUE (Name, Address), which is not logically equivalent to Name['UNIQUE']=True AND Address['UNIQUE']=True.

Thanks!