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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