Question. During schema evolution of a realtime table, can the default value of a column be derived from the value of an existing column? Before schema evolution:

json
-----------------
{"a": 1, "b": 2}

After schema evolution:

json              | a  |  b
-----------------------------
{"a": 1, "b": 2}  | 1  |  2

I believe so, yes.

Just a sanity check, the default value also works during backfill (i.e. sealed/closed segments) right?

Yes after you call the reload api

Thanks for the confirmation.