Roman Rokytskyy wrote:

>> 2) Same as above, but the engine writes to both new and deprecated
>> columns. 100% compatibility, but code duplication.
>>
>
> I guess this is the way to go. Can't we use triggers to populate
> deprecated columns, so the only duplication happens during the storage?
>
>

I don't think this is a question that can or should be answered in
general. It depends on what the columns are. What are the columns?