Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/19124
Ah, there are too many missing things in ORC code path.
`AlterTableAddColumnsCommand` seems not to allow ORC in
[verifyAlterTableAddColumn](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala#L237-L241
). It seems to be blocked by different reason, but it looks like we need to
solve that first in order to add test cases.
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