Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19649#discussion_r148783570 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala --- @@ -147,7 +154,15 @@ abstract class ExternalCatalog * Note: If the underlying implementation does not support altering a certain field, * this becomes a no-op. */ - def alterTable(tableDefinition: CatalogTable): Unit + final def alterTable(tableDefinition: CatalogTable): Unit = { --- End diff -- I'd suggest we leave it for now and watch other `alterTableXXX` events instead. I feel it's an overkill to have a heavy `alterTable` method to handling all table metadata updating, I think we will add more and more fine-grained alter table methods in the future, like `alterTableStats`, `alterTableDataSchema`, etc. and eventually this `alterTable` method will go away.
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