Github user budde commented on the issue:
https://github.com/apache/spark/pull/16944
Thanks for the thorough feedback.
In the latest update I refactored ```convertToLogicalRelation()``` to
update the schema of the ```catalogTable``` field of the value it returns
whenever a schema is successfully inferred rather than only when one is
inferred and successfully saved. This allowed me to clean up the changes to
this method a bit. @ericl -- feel free to give this another look over.
Per @cloud-fan's feedback, I added an ```alterTableSchema()``` method to
the ExternalTable interface. I've added implementations of it to
```InMemoryCatalog``` and ```HiveExternalCatalog``` along with tests. I've also
addressed the feedback from @viirya
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