Replicat cannot adapt to data schema change in real-time?

Hi,

We're trying this scenario in GoldenGate replication. The scenario should be common during service upgrade.

Site A and Site B are two replicated sites. Site A is the active side, that is, data is replicated from A to B.

Site B is upgraded first. So there may be new columns added or old columns dropped to its data schema.

And later, there may be a switch-over happened, to make site B active, and data should be replication from B to A.

On all above scenarios, there will be data replication between two different data schemas which have different number of columns.