Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13526
2 chained `AppendColumns` will have 2 functions: T => U and U => W, so we
can combine them this way:
convert UnsafeRow to T
apply func to T to generate U
apply func to U to generate W
convert W to UnsafeRow
append the new UnsafeRow to the original one
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