Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18849
If `ALTER TABLE` makes the hive compatibility broken, the value of this
flag becomes misleading. Currently, the naming of this flag is pretty general.
I expect this flag could be used for the other places in the future (besides
`ALTER TABLE ADD COLUMN`). Introducing a flag is simple but maintaining the
flag needs more works. That is why we do not want to introduce the extra new
flags if they are not required.
If we want to introduce such a flag, we also need to ensure the value is
always true. That means, we need to follow [what we are doing in the CREATE
TABLE code
path](https://github.com/apache/spark/blob/master/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala#L364-L374).
When Hive metastore complained about it, we should also set it to `false`.
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