Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/18849#discussion_r133999734 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala --- @@ -1175,6 +1205,27 @@ private[spark] class HiveExternalCatalog(conf: SparkConf, hadoopConf: Configurat client.listFunctions(db, pattern) } + /** Detect whether a table is stored with Hive-compatible metadata. */ + private def isHiveCompatible(table: CatalogTable): Boolean = { --- End diff -- Let me revert the question for you: why is it bad to have the compatibility bit be a table property? You cannot make a non-compatible table compatible after it's been created. At the very least, there is zero code that would achieve that today. And the key to this fix is that the `alterTableSchema` method needs to know whether the table is compatible or not in a reliable way.
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