Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18849
If the flag is set to true, then whenever an "alter table" command is
executed, it will follow the "Hive compatible" path, which lets the Hive
metastore decide whether the change is valid or not. So, to the best of Spark's
knowledge, compatibility is maintained because Hive did not complain about it.
No other table metadata (e.g. storage info) is changed by that command.
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